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Groups > sci.electronics.design > #451909 > unrolled thread
| Started by | "billbowden" <bperryb@bowdenshobbycircuits.info> |
|---|---|
| First post | 2017-03-14 20:18 -0800 |
| Last post | 2017-03-24 21:35 +0200 |
| Articles | 20 on this page of 301 — 34 participants |
Back to article view | Back to sci.electronics.design
Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-14 20:18 -0800
Re: Antenna ferrite loopsticks verses air core? John Robertson <spam@flippers.com> - 2017-03-14 22:21 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-14 23:43 -0700
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-15 12:27 -0800
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 17:19 -0700
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-15 18:51 -0800
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 20:08 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-16 00:24 -0400
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 22:17 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-16 13:04 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-15 02:48 -0400
Re: Antenna ferrite loopsticks verses air core? makolber@yahoo.com - 2017-03-15 06:35 -0700
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-15 12:46 -0800
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 17:22 -0700
Re: Antenna ferrite loopsticks verses air core? Mike Perkins <spam@spam.com> - 2017-03-30 01:42 +0100
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-29 18:20 -0700
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-16 08:44 +0200
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 00:17 -0700
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-17 00:58 +0200
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 16:19 -0700
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-15 13:01 -0800
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-15 17:39 -0400
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 17:33 -0700
Re: Antenna ferrite loopsticks verses air core? "Dave M" <dgminala@mediacombb.net> - 2017-03-15 09:40 -0500
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 17:26 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-15 08:25 -0700
Re: Antenna ferrite loopsticks verses air core? Tim Wescott <seemywebsite@myfooter.really> - 2017-03-15 12:38 -0500
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 17:28 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-15 17:59 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-15 18:10 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-16 08:20 -0700
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-16 09:45 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-16 10:26 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 15:47 -0700
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-16 17:15 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 17:36 -0700
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-16 18:46 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 23:45 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-17 07:30 -0700
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-17 08:28 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-17 11:38 -0400
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-17 12:21 -0700
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-17 13:08 -0800
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-18 10:32 +1100
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-17 17:10 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-17 22:31 -0400
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-18 14:53 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-18 20:38 -0400
Re: Antenna ferrite loopsticks verses air core? Jeff Liebermann <jeffl@cruzio.com> - 2017-03-18 18:10 -0700
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-18 18:39 -0700
Re: Antenna ferrite loopsticks verses air core? Jeff Liebermann <jeffl@cruzio.com> - 2017-03-19 09:53 -0700
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-19 12:27 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-18 22:11 -0400
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-19 10:41 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-17 17:13 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-17 17:28 -0700
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-18 12:21 +0200
Re: Antenna ferrite loopsticks verses air core? Allan Herriman <allanherriman@hotmail.com> - 2017-03-18 12:15 +0000
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-17 17:36 -0700
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-17 18:09 -0700
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-17 18:21 -0700
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-18 10:49 +0200
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-18 08:30 -0700
Re: Antenna ferrite loopsticks verses air core? mkolber1@gmail.com - 2017-03-18 12:49 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-18 12:57 -0700
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-18 23:48 +0200
Re: Antenna ferrite loopsticks verses air core? krw@notreal.com - 2017-03-18 20:08 -0400
Re: Antenna ferrite loopsticks verses air core? kevin93 <kevin@whitedigs.com> - 2017-03-18 13:09 -0700
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-18 04:08 -0500
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-19 12:32 +1100
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-19 10:45 -0500
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-20 11:08 +1100
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-19 22:31 -0500
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-20 16:31 +1100
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-21 01:19 -0500
Re: Antenna ferrite loopsticks verses air core? Jasen Betts <jasen@xnet.co.nz> - 2017-03-22 19:15 +0000
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-18 10:41 +1100
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-18 14:47 -0700
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-19 00:22 +0200
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-19 12:39 +1100
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-18 19:11 -0700
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-19 13:15 +1100
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-20 04:26 -0700
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-21 13:17 +1100
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-21 01:32 -0500
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-21 10:38 +0200
Re: Antenna ferrite loopsticks verses air core? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-21 02:53 -0400
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-21 01:01 -0700
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-21 12:33 +0200
Re: Antenna ferrite loopsticks verses air core? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-21 09:42 -0400
Re: Antenna ferrite loopsticks verses air core? piglet <erichpwagner@hotmail.com> - 2017-03-21 19:05 +0000
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-21 12:49 -0700
Re: Antenna ferrite loopsticks verses air core? piglet <erichpwagner@hotmail.com> - 2017-03-21 18:39 +0000
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-21 22:39 +0200
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-21 12:30 +0200
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-19 17:43 +0200
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-21 14:39 +0200
Re: Antenna ferrite loopsticks verses air core? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-21 09:46 -0400
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-17 17:31 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-17 17:46 -0700
Re: Antenna ferrite loopsticks verses air core? George Herold <gherold@teachspin.com> - 2017-03-17 18:18 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-21 09:55 -0400
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-17 07:27 -0700
Re: Antenna ferrite loopsticks verses air core? DemonicTubes <tlackie@gmail.com> - 2017-03-17 09:11 -0700
Re: Antenna ferrite loopsticks verses air core? pcdhobbs@gmail.com - 2017-03-17 11:40 -0700
Re: Antenna ferrite loopsticks verses air core? bitrex <bitrex@de.lete.earthlink.net> - 2017-03-17 12:29 -0400
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-17 12:25 -0700
Re: Antenna ferrite loopsticks verses air core? bitrex <bitrex@de.lete.earthlink.net> - 2017-03-18 16:20 -0400
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 15:41 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-16 16:14 -0700
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 16:25 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-19 11:22 -0500
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-15 21:20 -0500
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-15 23:02 -0500
Re: Antenna ferrite loopsticks verses air core? whit3rd <whit3rd@gmail.com> - 2017-03-15 22:52 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-16 02:48 -0400
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 00:10 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-16 08:21 -0500
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-16 16:10 -0700
Re: Antenna ferrite loopsticks verses air core? Bill Beaty <billb@eskimo.com> - 2017-03-16 12:12 -0700
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-16 13:06 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-16 15:39 -0500
Re: Antenna ferrite loopsticks verses air core? John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-16 19:57 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-18 21:26 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-17 09:44 -0700
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-17 17:35 -0700
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-17 18:35 -0800
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-20 09:01 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-19 08:20 -0500
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-19 15:31 -0800
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-19 19:42 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-19 19:20 -0500
Re: Antenna ferrite loopsticks verses air core? Phil Allison <pallison49@gmail.com> - 2017-03-19 17:49 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-19 20:19 -0500
Re: Antenna ferrite loopsticks verses air core? Robert Baer <robertbaer@localnet.com> - 2017-03-19 19:44 -0800
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 00:00 -0400
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-19 23:56 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 08:36 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-20 09:29 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 12:54 -0500
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 13:16 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-20 12:31 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 16:46 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 17:17 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-20 18:25 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 17:15 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 18:25 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 17:56 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-20 18:49 -0700
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-21 00:19 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-21 07:27 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-21 07:28 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-21 11:24 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-21 13:39 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-23 13:52 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-23 16:48 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-23 23:58 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-24 01:13 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-24 07:00 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-24 12:47 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-24 15:13 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-24 17:05 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-24 08:44 -0500
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-24 09:13 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-24 09:40 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-24 13:08 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-24 13:42 -0700
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-24 14:20 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-24 22:46 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-24 22:13 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 09:29 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-25 11:33 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 15:20 -0400
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-25 15:25 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 19:17 -0400
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-25 17:02 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 21:25 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 20:10 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 21:32 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 22:42 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-26 00:00 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-26 04:00 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-26 05:36 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-26 09:34 -0500
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-26 10:23 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-26 13:10 -0400
Re: Antenna ferrite loopsticks verses air core? Jasen Betts <jasen@xnet.co.nz> - 2017-03-27 09:32 +0000
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 14:44 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 16:34 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 16:12 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 17:44 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 17:08 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-25 16:00 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 18:27 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 19:31 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-25 21:21 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 23:42 -0400
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-25 17:34 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 16:34 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 17:21 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 18:27 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 17:54 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 20:55 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 20:09 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 21:28 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 21:23 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 23:25 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-21 07:54 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-21 07:57 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-21 11:54 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-21 12:21 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-21 21:40 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-21 13:27 -0400
Re: Antenna ferrite loopsticks verses air core? "billbowden" <bperryb@bowdenshobbycircuits.info> - 2017-03-20 15:41 -0800
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-20 19:13 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-20 21:18 -0400
Re: Antenna ferrite loopsticks verses air core? "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-21 04:35 -0500
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-20 11:06 +0200
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-24 10:14 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-24 13:59 -0400
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-24 13:36 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 13:49 -0400
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-25 12:30 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-25 21:39 -0400
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-26 07:35 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-26 13:15 -0400
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-27 07:46 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-27 10:59 -0400
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-27 09:22 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-27 23:47 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-28 18:15 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-28 03:42 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-28 19:07 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-28 04:35 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-28 21:58 +1100
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-28 09:42 -0500
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-28 12:51 +0300
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-28 07:23 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 13:28 -0400
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-30 00:37 +0300
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 21:02 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-28 09:57 -0500
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-28 09:05 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-28 11:27 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 13:29 -0400
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-27 14:57 +0300
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-27 07:25 -0500
Re: Antenna ferrite loopsticks verses air core? Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-27 09:47 -0700
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-27 19:51 +0300
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-27 12:21 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-27 18:54 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-28 10:16 +1100
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-27 16:58 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-27 23:33 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-28 18:18 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-28 03:48 -0400
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-28 07:28 -0700
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-28 13:41 +0300
Re: Antenna ferrite loopsticks verses air core? Jasen Betts <jasen@xnet.co.nz> - 2017-03-28 07:44 +0000
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-27 21:18 -0500
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-28 18:22 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-28 04:01 -0400
Re: Antenna ferrite loopsticks verses air core? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-28 11:04 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-28 10:58 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-28 11:13 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-28 10:12 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 13:47 -0400
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-29 14:18 -0500
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-30 00:47 +0300
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-29 19:15 -0500
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 21:40 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-29 14:26 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 23:47 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-29 10:18 +1100
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-03-29 19:12 -0500
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-29 11:49 +1100
Re: Antenna ferrite loopsticks verses air core? Jeff Liebermann <jeffl@cruzio.com> - 2017-03-29 18:21 -0700
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-29 14:19 +1100
Re: Antenna ferrite loopsticks verses air core? Jeff Liebermann <jeffl@cruzio.com> - 2017-03-29 18:01 -0700
Re: Antenna ferrite loopsticks verses air core? Ralph Barone <ralph@invalid.com> - 2017-03-30 02:35 +0000
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-03-29 14:23 +1100
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-29 23:46 -0400
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-03-30 21:40 -0700
Re: Antenna ferrite loopsticks verses air core? krw@notreal.com - 2017-03-31 20:08 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-04-02 12:59 +1000
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-04-01 23:55 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-04-02 14:36 +1000
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-04-02 01:56 -0400
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-04-02 18:11 +1000
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-04-02 07:35 -0500
Re: Antenna ferrite loopsticks verses air core? mkolber1@gmail.com - 2017-04-02 06:16 -0700
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-04-03 07:40 +1000
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-04-02 08:12 -0700
Re: Antenna ferrite loopsticks verses air core? Clifford Heath <no.spam@please.net> - 2017-04-03 08:47 +1000
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-04-02 18:39 -0700
Re: Antenna ferrite loopsticks verses air core? amdx <nojunk@knology.net> - 2017-04-02 21:22 -0500
Re: Antenna ferrite loopsticks verses air core? dagmargoodboat@yahoo.com - 2017-04-03 14:12 -0700
Re: Antenna ferrite loopsticks verses air core? rickman <gnuarm@gmail.com> - 2017-03-27 23:25 -0400
Re: Antenna ferrite loopsticks verses air core? upsidedown@downunder.com - 2017-03-28 12:58 +0300
Re: Antenna ferrite loopsticks verses air core? Joerg <news@analogconsultants.com> - 2017-03-27 07:52 -0700
Re: Antenna ferrite loopsticks verses air core? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-03-24 21:35 +0200
Page 6 of 16 — ← Prev page 1 … 4 5 [6] 7 8 … 16 Next page →
| From | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-17 18:18 -0700 |
| Message-ID | <29bb0bc8-c72e-405e-9049-63df13aadf43@googlegroups.com> |
| In reply to | #452351 |
On Friday, March 17, 2017 at 8:47:09 PM UTC-4, John Larkin wrote: > On Fri, 17 Mar 2017 17:31:46 -0700 (PDT), George Herold > <gherold@teachspin.com> wrote: > > >On Friday, March 17, 2017 at 11:38:44 AM UTC-4, Phil Hobbs wrote: > >> On 03/17/2017 11:28 AM, George Herold wrote: > >> > On Friday, March 17, 2017 at 10:30:32 AM UTC-4, John Larkin wrote: > >> >> On Thu, 16 Mar 2017 18:46:06 -0700 (PDT), George Herold > >> >> <gherold@teachspin.com> wrote: > >> >> > >> >>> On Thursday, March 16, 2017 at 8:36:16 PM UTC-4, Phil Allison wrote: > >> >>>> George Herold wrote: > >> >>>> > >> >>>> > >> >>>>>> > >> >>>>>>> I've got an AM radio that came with an air core antenna. > >> >>>>>>> (1990's vintage) > >> >>>>>>> ~4" (10 cm) squarish loop. Not sure how many turns. > >> >>>>>>> Works fine. > >> >>>>>>> > >> >>>>>> > >> >>>>>> ** So it's an external loop for a main powered receiver ? > >> >>>>>> > >> >>>>> Right, It's a JVC "ultra compact component system" > >> >>>>> FS-1000 > >> >>>>> > >> >>>> > >> >>>> ** So why didn't you post that info before? > >> >>>> > >> >>> 'cos I'm now at home and not at work. > >> >>>> It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. > >> >>>> > >> >>>> > >> >>>>> > >> >>>>> Knowing almost nothing about AM, (and assuming I don't care about price.) > >> >>>>> I figure I want the highest Q possible on the front end.. > >> >>>>> > >> >>>> > >> >>>> ** Nope. > >> >>>> > >> >>>> You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. > >> >>> OK I was thinking of best signal to noise, and figuring that ~1-2 kHz would > >> >>> be enough.. Everyones "best/ optimal" is a bit different. > >> >> > >> >> An AM antenna doesn't need to be tuned at all. An untuned coil will > >> >> snoop the ambient h-field. > >> > I guess that's right. As long as most of the noise is "in the air" it doesn't > >> > really matter where the band pass filter is. (Except for dynamic range issues.) > >> > >> As you say, dynamic range. An untuned input needs a stronger mixer. A > >> Q of 10 or 20 would help a lot. > >> > >> On the other hand, one could just use a Mini Circuits mixer with a +17 > >> dBm LO, or a nice analogue mux with square wave drive. It takes a lot > >> to screw one of those up. > >Hah, I made an AM radio just that way. Not with a loop, but just > >a length of wire. (It's probably the worlds's worst AM radio.) > >I had to add series L's (selected for range) to make it work. > >Circuit from Terman's radio electronics book. > > > >So a loop (with parallel C) into a TIA? ... (I'd rather use an opamp.) > >or will that wig out at the C side of the resonance? > > > > A short wire antenna gets a voltage equal to the local e-field. All > you need to do is drive an amp with reasonably low input capacitance, > like a jfet or something. Oh no my mistake, I was thinking of how to couple in from a loop. George H. > > I could patent that, but it's been done for 100 years or so. > > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com
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| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Date | 2017-03-21 09:55 -0400 |
| Message-ID | <ieWdnV7MNpBOrUzFnZ2dnUU7-cnNnZ2d@supernews.com> |
| In reply to | #452346 |
On 03/17/2017 08:31 PM, George Herold wrote: > On Friday, March 17, 2017 at 11:38:44 AM UTC-4, Phil Hobbs wrote: >> On 03/17/2017 11:28 AM, George Herold wrote: >>> On Friday, March 17, 2017 at 10:30:32 AM UTC-4, John Larkin wrote: >>>> On Thu, 16 Mar 2017 18:46:06 -0700 (PDT), George Herold >>>> <gherold@teachspin.com> wrote: >>>> >>>>> On Thursday, March 16, 2017 at 8:36:16 PM UTC-4, Phil Allison wrote: >>>>>> George Herold wrote: >>>>>> >>>>>> >>>>>>>> >>>>>>>>> I've got an AM radio that came with an air core antenna. >>>>>>>>> (1990's vintage) >>>>>>>>> ~4" (10 cm) squarish loop. Not sure how many turns. >>>>>>>>> Works fine. >>>>>>>>> >>>>>>>> >>>>>>>> ** So it's an external loop for a main powered receiver ? >>>>>>>> >>>>>>> Right, It's a JVC "ultra compact component system" >>>>>>> FS-1000 >>>>>>> >>>>>> >>>>>> ** So why didn't you post that info before? >>>>>> >>>>> 'cos I'm now at home and not at work. >>>>>> It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. >>>>>> >>>>>> >>>>>>> >>>>>>> Knowing almost nothing about AM, (and assuming I don't care about price.) >>>>>>> I figure I want the highest Q possible on the front end.. >>>>>>> >>>>>> >>>>>> ** Nope. >>>>>> >>>>>> You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. >>>>> OK I was thinking of best signal to noise, and figuring that ~1-2 kHz would >>>>> be enough.. Everyones "best/ optimal" is a bit different. >>>> >>>> An AM antenna doesn't need to be tuned at all. An untuned coil will >>>> snoop the ambient h-field. >>> I guess that's right. As long as most of the noise is "in the air" it doesn't >>> really matter where the band pass filter is. (Except for dynamic range issues.) >> >> As you say, dynamic range. An untuned input needs a stronger mixer. A >> Q of 10 or 20 would help a lot. >> >> On the other hand, one could just use a Mini Circuits mixer with a +17 >> dBm LO, or a nice analogue mux with square wave drive. It takes a lot >> to screw one of those up. > Hah, I made an AM radio just that way. Not with a loop, but just > a length of wire. (It's probably the worlds's worst AM radio.) Probably a lot better than most, especially in the mixer department. Cobbling together synthesizers and MCL parts with BNC cables is an amazingly fast and effective way of measuring stuff, if you're any good at it. I learned RF in the palmy days of my youth, as I've discussed here before--I got chucked right in the deep end, having to design high performance frequency control modules for the world's first civilian DBS system, starting from an astronomy degree and a hobby background. I'd read about PLLs, but never seen one to know what it was, let alone designed one. Talk about dumb luck. I'd never have come up to speed that fast otherwise. > I had to add series L's (selected for range) to make it work. > Circuit from Terman's radio electronics book. Well, even you probably didn't have a big enough back yard for a half wave dipole at 540 kHz. So there's no shame in a loading coil for that. > > So a loop (with parallel C) into a TIA? ... (I'd rather use an opamp.) > or will that wig out at the C side of the resonance? For a high-Z antenna like that I'd probably use a bootstrapped JFET follower front end, with appropriate protection diodes and probably a couple of LND150s to limit the diode current. You really can get gains of 0.9997 that way, with pretty decent bandwidth. There's not a lot of room for distortion to hide in a circuit like that. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-17 07:27 -0700 |
| Message-ID | <lfsncc5j80o53485k83u6bq6gbqfucfdd3@4ax.com> |
| In reply to | #452205 |
On Thu, 16 Mar 2017 17:36:12 -0700 (PDT), Phil Allison <pallison49@gmail.com> wrote: >George Herold wrote: > > >> > >> > > I've got an AM radio that came with an air core antenna. >> > > (1990's vintage) >> > > ~4" (10 cm) squarish loop. Not sure how many turns. >> > > Works fine. >> > > >> > >> > ** So it's an external loop for a main powered receiver ? >>> >> Right, It's a JVC "ultra compact component system" >> FS-1000 >> > >** So why didn't you post that info before? > >It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. > > >> >> Knowing almost nothing about AM, (and assuming I don't care about price.) >> I figure I want the highest Q possible on the front end.. >> > >** Nope. > >You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. > > > >> > You need to learn how to post unambiguously too. >> > >> > IOW not smartarse style like Larkin. >> >> Larkin is great, > >** Larkin is a smug pig and a troll. > > He is so narcissistic he thinks he owns the NG and everyone on it. > > Hey, if anybody wants Allison, you can gave him cheap. As-is, Free shipping. -- John Larkin Highland Technology, Inc lunatic fringe electronics
[toc] | [prev] | [next] | [standalone]
| From | DemonicTubes <tlackie@gmail.com> |
|---|---|
| Date | 2017-03-17 09:11 -0700 |
| Message-ID | <770261b7-7f44-4820-bf25-b2e62e63a86d@googlegroups.com> |
| In reply to | #452269 |
On Friday, March 17, 2017 at 8:27:59 AM UTC-6, John Larkin wrote: > On Thu, 16 Mar 2017 17:36:12 -0700 (PDT), Phil Allison > <pallison49@gmail.com> wrote: > > >George Herold wrote: > > > > > >> > > >> > > I've got an AM radio that came with an air core antenna. > >> > > (1990's vintage) > >> > > ~4" (10 cm) squarish loop. Not sure how many turns. > >> > > Works fine. > >> > > > >> > > >> > ** So it's an external loop for a main powered receiver ? > >>> > >> Right, It's a JVC "ultra compact component system" > >> FS-1000 > >> > > > >** So why didn't you post that info before? > > > >It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. > > > > > >> > >> Knowing almost nothing about AM, (and assuming I don't care about price.) > >> I figure I want the highest Q possible on the front end.. > >> > > > >** Nope. > > > >You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. > > > > > > > >> > You need to learn how to post unambiguously too. > >> > > >> > IOW not smartarse style like Larkin. > >> > >> Larkin is great, > > > >** Larkin is a smug pig and a troll. > > > > He is so narcissistic he thinks he owns the NG and everyone on it. > > > > > > Hey, if anybody wants Allison, you can gave him cheap. As-is, Free > shipping. > > > -- > > John Larkin Highland Technology, Inc > > lunatic fringe electronics That reminds me...anybody else notice DecadentLinuxUserNumeroUno suddenly went silent some time last summer?
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-17 11:40 -0700 |
| Message-ID | <8c6f233f-d5e9-4498-81ec-d49081baaab0@googlegroups.com> |
| In reply to | #452281 |
>That reminds me...anybody else notice DecadentLinuxUserNumeroUno >suddenly went silent some time last summer? Yeah, we talked about it a couple of months afterwards, but iirc nobody turned up any leads. Cheers Phil Hobbs
[toc] | [prev] | [next] | [standalone]
| From | bitrex <bitrex@de.lete.earthlink.net> |
|---|---|
| Date | 2017-03-17 12:29 -0400 |
| Message-ID | <l9UyA.44343$Hf3.26348@fx37.iad> |
| In reply to | #452205 |
On 03/16/2017 08:36 PM, Phil Allison wrote: > George Herold wrote: > > >>> >>>> I've got an AM radio that came with an air core antenna. >>>> (1990's vintage) >>>> ~4" (10 cm) squarish loop. Not sure how many turns. >>>> Works fine. >>>> >>> >>> ** So it's an external loop for a main powered receiver ? >>> >> Right, It's a JVC "ultra compact component system" >> FS-1000 >> > > ** So why didn't you post that info before? > > It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. > > >> >> Knowing almost nothing about AM, (and assuming I don't care about price.) >> I figure I want the highest Q possible on the front end.. >> > > ** Nope. > > You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. > > > >>> You need to learn how to post unambiguously too. >>> >>> IOW not smartarse style like Larkin. >> >> Larkin is great, > > ** Larkin is a smug pig and a troll. > > He is so narcissistic he thinks he owns the NG and everyone on it. To be fair he probably knows that Usenet was designed to not have a central administrator...
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-17 12:25 -0700 |
| Message-ID | <htdocctkmpe5uerhu22nu0a2qp6s4palt1@4ax.com> |
| In reply to | #452284 |
On Fri, 17 Mar 2017 12:29:05 -0400, bitrex <bitrex@de.lete.earthlink.net> wrote: >On 03/16/2017 08:36 PM, Phil Allison wrote: >> George Herold wrote: >> >> >>>> >>>>> I've got an AM radio that came with an air core antenna. >>>>> (1990's vintage) >>>>> ~4" (10 cm) squarish loop. Not sure how many turns. >>>>> Works fine. >>>>> >>>> >>>> ** So it's an external loop for a main powered receiver ? >>>> >>> Right, It's a JVC "ultra compact component system" >>> FS-1000 >>> >> >> ** So why didn't you post that info before? >> >> It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. >> >> >>> >>> Knowing almost nothing about AM, (and assuming I don't care about price.) >>> I figure I want the highest Q possible on the front end.. >>> >> >> ** Nope. >> >> You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. >> >> >> >>>> You need to learn how to post unambiguously too. >>>> >>>> IOW not smartarse style like Larkin. >>> >>> Larkin is great, >> >> ** Larkin is a smug pig and a troll. >> >> He is so narcissistic he thinks he owns the NG and everyone on it. > >To be fair he probably knows that Usenet was designed to not have a >central administrator... There are moderated NGs. This ain't one. Most of usenet is dead. SED is unusually active, some of it actually on topic. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | bitrex <bitrex@de.lete.earthlink.net> |
|---|---|
| Date | 2017-03-18 16:20 -0400 |
| Message-ID | <uEgzA.9472$Fv2.1162@fx02.iad> |
| In reply to | #452317 |
On 03/17/2017 03:25 PM, John Larkin wrote: > On Fri, 17 Mar 2017 12:29:05 -0400, bitrex > <bitrex@de.lete.earthlink.net> wrote: > >> On 03/16/2017 08:36 PM, Phil Allison wrote: >>> George Herold wrote: >>> >>> >>>>> >>>>>> I've got an AM radio that came with an air core antenna. >>>>>> (1990's vintage) >>>>>> ~4" (10 cm) squarish loop. Not sure how many turns. >>>>>> Works fine. >>>>>> >>>>> >>>>> ** So it's an external loop for a main powered receiver ? >>>>> >>>> Right, It's a JVC "ultra compact component system" >>>> FS-1000 >>>> >>> >>> ** So why didn't you post that info before? >>> >>> It's a fucking frame antenna, already discussed here in this thread and been around since the dawn of radio. >>> >>> >>>> >>>> Knowing almost nothing about AM, (and assuming I don't care about price.) >>>> I figure I want the highest Q possible on the front end.. >>>> >>> >>> ** Nope. >>> >>> You need at least 10kHz of bandwidth at the antenna so the Q must not exceed 50 to 100 across the AM band. You will find that antenna has a fairly low Q in practice. >>> >>> >>> >>>>> You need to learn how to post unambiguously too. >>>>> >>>>> IOW not smartarse style like Larkin. >>>> >>>> Larkin is great, >>> >>> ** Larkin is a smug pig and a troll. >>> >>> He is so narcissistic he thinks he owns the NG and everyone on it. >> >> To be fair he probably knows that Usenet was designed to not have a >> central administrator... > > There are moderated NGs. This ain't one. > > Most of usenet is dead. SED is unusually active, some of it actually > on topic. Probably for the best; thinking back about the mid 1990s and looking through the list of dead "alt" newsgroups you wonder "what the hell were they thinking?" Not sure anyone is missing the loss of alt.sex.animals.monica-lewinsky or alt.flame.jews in Web 2.0 2k17
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| From | Phil Allison <pallison49@gmail.com> |
|---|---|
| Date | 2017-03-16 15:41 -0700 |
| Message-ID | <6d75f03d-cca6-4979-b62e-cad03f783ea0@googlegroups.com> |
| In reply to | #452116 |
John Larkin wrote: > > >> > > >> >** The latter is exactly what a ferrite antenna is optimised for. > >> > > >> > > >> In the early days of transistor radios, size was limited and gain was > >> expensive, so it was worth some ferrite to get more RF input power. > >> Gain is now so cheap that an air core antenna might be OK. > >> > > > >** Really ? > > > > Try posting an idea that is not full of ambiguities. > > > > Maybe I should have used shorter words? > ** Express you idea clearly or fuck off. I know already you will do neither. You pompous, bullshitting ass. ..... Phil
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-16 16:14 -0700 |
| Message-ID | <e07mcc9c1alqoa8v911v5n2apnfl7i9hnp@4ax.com> |
| In reply to | #452180 |
On Thu, 16 Mar 2017 15:41:37 -0700 (PDT), Phil Allison <pallison49@gmail.com> wrote: >John Larkin wrote: >> > >> >> > >> >> >** The latter is exactly what a ferrite antenna is optimised for. >> >> > >> >> > >> >> In the early days of transistor radios, size was limited and gain was >> >> expensive, so it was worth some ferrite to get more RF input power. >> >> Gain is now so cheap that an air core antenna might be OK. >> >> >> > >> >** Really ? >> > >> > Try posting an idea that is not full of ambiguities. >> > >> >> Maybe I should have used shorter words? >> > > ** Express you idea clearly which I did > or fuck off. You and what army? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | Phil Allison <pallison49@gmail.com> |
|---|---|
| Date | 2017-03-16 16:25 -0700 |
| Message-ID | <5767c8c3-8a62-413f-983e-f2ef0061c2b0@googlegroups.com> |
| In reply to | #452187 |
John Larkin wrote: > >> >> > > >> >> >** The latter is exactly what a ferrite antenna is optimised for. > >> >> > > >> >> > > >> >> In the early days of transistor radios, size was limited and gain was > >> >> expensive, so it was worth some ferrite to get more RF input power. > >> >> Gain is now so cheap that an air core antenna might be OK. > >> >> > >> > > >> >** Really ? > >> > > >> > Try posting an idea that is not full of ambiguities. > >> > > >> > >> Maybe I should have used shorter words? > >> > > > > ** Express you idea clearly > > which I did ** Another deliberate lie. > > or fuck off. > > You and what army? > ** Larkin must be either drunk or on drugs today. Wot an obnoxious, fucking shithead. ..... Phil
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| From | amdx <nojunk@knology.net> |
|---|---|
| Date | 2017-03-19 11:22 -0500 |
| Message-ID | <oamb3m$ak4$1@dont-email.me> |
| In reply to | #452190 |
On 3/16/2017 6:25 PM, Phil Allison wrote:
> John Larkin wrote:
>
>
>>>>>>>
>>>>>>> ** The latter is exactly what a ferrite antenna is optimised for.
>>>>>>>
>>>>>>>
>>>>>> In the early days of transistor radios, size was limited and gain was
>>>>>> expensive, so it was worth some ferrite to get more RF input power.
>>>>>> Gain is now so cheap that an air core antenna might be OK.
>>>>>>
>>>>>
>>>>> ** Really ?
>>>>>
>>>>> Try posting an idea that is not full of ambiguities.
>>>>>
>>>>
>>>> Maybe I should have used shorter words?
>>>>
>>>
>>> ** Express you idea clearly
>>
>> which I did
>
>
> ** Another deliberate lie.
>
>
>>> or fuck off.
>>
>> You and what army?
>>
>
> ** Larkin must be either drunk or on drugs today.
>
> Wot an obnoxious, fucking shithead.
>
>
>
> ..... Phil
>
Now that's funny!
Mikek
---
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| From | amdx <nojunk@knology.net> |
|---|---|
| Date | 2017-03-15 21:20 -0500 |
| Message-ID | <oacsk7$42q$1@dont-email.me> |
| In reply to | #451909 |
On 3/14/2017 11:18 PM, billbowden wrote:
> Which is a better design. Suppose you have a 6 inch length of PVC pipe with
> numerous turns of wire that has an inductance of say 200uH. Now suppose you
> use the same (6 inch) piece of PVC with a ferrite rod in the core with
> considerably fewer turns of wire. Which one would capture the most signal
> at the AM Broadcast frequencies (500K to 2 Megs) and produce the greatest
> signal output? Would it be more ferrite, or more wire?
>
>
It seems to be more ferrite. The latest and greatest ferrite antenna
is the Ferrite Sleeve Loop (FSL). It uses multiple rods, or bars
arranged side by side in a circle with wire wrapped around it.
Diameters range from 5" to 15" although one day someone will spend the
money to make 20"
Here's one that that is 7" in diameter and uses 68-5/16" diameter rods
5" in length.
> http://www.thomasn.sverige.net/7_Inch_Affordable_FSL.pdf
Optimization of Ferrite Sleeve Antenna.
> http://www.am-dx.com/antennas/FSL%20Antenna%20Design%20Optimization.htm
Lots of comparison data here.
For determination of the design factors influencing an FSL antenna’s
weak-signal performance, four of the FSL test model match ups were
considered very important. These four match ups (with the design factors
clarified by the results) were as follows:
Followup on the link.
Search FSL for more info, Gary Debock is an experimenting guru.
Mike
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| From | "Tim Williams" <tiwill@seventransistorlabs.com> |
|---|---|
| Date | 2017-03-15 23:02 -0500 |
| Message-ID | <oad2ie$9o3$1@dont-email.me> |
| In reply to | #452060 |
Reasonable enough. The middle of the ferrite doesn't do you any good; in fact, after enough size, it's a complete drag on the system -- core losses, skin effect and dielectric loss take over! Ferrite isn't as conductive as iron, but it still needs to be laminated if you want to use really thick sections of it at the same frequencies as usual. This is the fundamental behind why different shapes of ferrite beads have different impedance plots, despite being the same material. Thicker and longer beads have an impedance peak at lower frequencies; the length and frequency correspond to the speed of light in the material. Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: http://seventransistorlabs.com "amdx" <nojunk@knology.net> wrote in message news:oacsk7$42q$1@dont-email.me... > On 3/14/2017 11:18 PM, billbowden wrote: >> Which is a better design. Suppose you have a 6 inch length of PVC pipe >> with >> numerous turns of wire that has an inductance of say 200uH. Now suppose >> you >> use the same (6 inch) piece of PVC with a ferrite rod in the core with >> considerably fewer turns of wire. Which one would capture the most >> signal >> at the AM Broadcast frequencies (500K to 2 Megs) and produce the greatest >> signal output? Would it be more ferrite, or more wire? >> >> > It seems to be more ferrite. The latest and greatest ferrite antenna is > the Ferrite Sleeve Loop (FSL). It uses multiple rods, or bars arranged > side by side in a circle with wire wrapped around it. > Diameters range from 5" to 15" although one day someone will spend the > money to make 20" > Here's one that that is 7" in diameter and uses 68-5/16" diameter rods 5" > in length. >> http://www.thomasn.sverige.net/7_Inch_Affordable_FSL.pdf > > Optimization of Ferrite Sleeve Antenna. >> http://www.am-dx.com/antennas/FSL%20Antenna%20Design%20Optimization.htm > Lots of comparison data here. > > For determination of the design factors influencing an FSL antenna’s > weak-signal performance, four of the FSL test model match ups were > considered very important. These four match ups (with the design factors > clarified by the results) were as follows: > > Followup on the link. > > Search FSL for more info, Gary Debock is an experimenting guru. > Mike > > > > > > > > > > > > > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus >
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| From | whit3rd <whit3rd@gmail.com> |
|---|---|
| Date | 2017-03-15 22:52 -0700 |
| Message-ID | <4ae58694-1ad1-4d1b-904c-ed6507e166d1@googlegroups.com> |
| In reply to | #451909 |
On Tuesday, March 14, 2017 at 9:18:38 PM UTC-7, Bill Bowden wrote: > Which is a better design. Suppose you have a 6 inch length of PVC pipe with > numerous turns of wire that has an inductance of say 200uH. Now suppose you > use the same (6 inch) piece of PVC with a ferrite rod in the core ... There's no comparison. That's because the two antenna designs have completely different impedances, and must feed entirely different frontend RF amps. At some frequency, with some particular input gain stage, you can't just swap those two antennas: you need to redesign the next stage as well.
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| From | rickman <gnuarm@gmail.com> |
|---|---|
| Date | 2017-03-16 02:48 -0400 |
| Message-ID | <oadcba$sqo$1@dont-email.me> |
| In reply to | #452090 |
On 3/16/2017 1:52 AM, whit3rd wrote: > On Tuesday, March 14, 2017 at 9:18:38 PM UTC-7, Bill Bowden wrote: >> Which is a better design. Suppose you have a 6 inch length of PVC pipe with >> numerous turns of wire that has an inductance of say 200uH. Now suppose you >> use the same (6 inch) piece of PVC with a ferrite rod in the core ... > > There's no comparison. That's because the two antenna designs have > completely different impedances, and must feed entirely different > frontend RF amps. At some frequency, with some particular input > gain stage, you can't just swap those two antennas: you need to redesign > the next stage as well. Or you simply couple the antenna to the receiver appropriately. -- Rick C
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| From | Phil Allison <pallison49@gmail.com> |
|---|---|
| Date | 2017-03-16 00:10 -0700 |
| Message-ID | <36c9734c-9f1d-4a91-93e0-844d14ce535c@googlegroups.com> |
| In reply to | #452090 |
whit3rd wrote: > On Tuesday, March 14, 2017 at 9:18:38 PM UTC-7, Bill Bowden wrote: > > Which is a better design. Suppose you have a 6 inch length of PVC pipe with > > numerous turns of wire that has an inductance of say 200uH. Now suppose you > > use the same (6 inch) piece of PVC with a ferrite rod in the core ... > > There's no comparison. > ** You have **over-snpped** and ruined the OP's question. > That's because the two antenna designs have > completely different impedances, ** The ferrite one will have a higher Q, but similar impedance. ..... Phil
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| From | amdx <nojunk@knology.net> |
|---|---|
| Date | 2017-03-16 08:21 -0500 |
| Message-ID | <oae3at$3t3$1@dont-email.me> |
| In reply to | #452095 |
On 3/16/2017 2:10 AM, Phil Allison wrote:
> whit3rd wrote:
>
>> On Tuesday, March 14, 2017 at 9:18:38 PM UTC-7, Bill Bowden wrote:
>>> Which is a better design. Suppose you have a 6 inch length of PVC pipe with
>>> numerous turns of wire that has an inductance of say 200uH. Now suppose you
>>> use the same (6 inch) piece of PVC with a ferrite rod in the core ...
>>
>> There's no comparison.
>>
>
> ** You have **over-snpped** and ruined the OP's question.
>
>> That's because the two antenna designs have
>> completely different impedances,
>
> ** The ferrite one will have a higher Q, but similar impedance.
>
>
>
> ..... Phil
>
I'll disagree with you on that Phil, I recently built 5 coils
using 6" polystyrene pipe coupler as a form. I wound them with 660/46
wire with spacing's of 11 Turns Per Inch, 12 TPI, 13 TPI, 14 TPI and 15
TPI. All coils were between 232uh and 237uh.
10 TPI, 11 TPI and 12 TPI were pretty close, with Q at 500kHz of 1250,
peaking at about 750kHz with a Q of 1450 and dropping to 950 at 1600kHz.
I used a Boonton 260A Q meter and averaged 5 tests, I'll give the
caveat that high Q's are elusive to measure.
Your standard 61 material is to lossy to get this high, there is some
lower loss material coming out of China that is performing well. The
best I ever got with a #61 material was 550 Q.
Now to defeat my argument, a Chinese radio amateur made a rod with 26
toroids with a Teflon core and Teflon spacers and two parallel 660/46
litz wires, measured peak Q just over 1812.
Then another another duplicated his experiment and got peak Q of 2026.
The material is coming from China and is R40C1.
Details here,
> http://theradioboard.com/rb/viewtopic.php?f=2&t=7058
Proving at least some of the human race, has a lot of free time.
Mikek
Helmet and flak jacket in place.
---
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| From | Phil Allison <pallison49@gmail.com> |
|---|---|
| Date | 2017-03-16 16:10 -0700 |
| Message-ID | <a43aab05-cdb2-4ab7-a726-d9d4f904eb0a@googlegroups.com> |
| In reply to | #452108 |
The amdx fool wrote:
>
> Bill Bowden wrote:
>>
> >>> Which is a better design. Suppose you have a 6 inch length of
> PVC pipe with numerous turns of wire that has an inductance of say 200uH.
> Now suppose you use the same (6 inch) piece of PVC with a ferrite rod in the core ...
> >>
> >> There's no comparison.
> >>
> >
> > ** You have **over-snipped** and ruined the OP's question.
> >
> >> That's because the two antenna designs have
> >> completely different impedances,
> >
> > ** The ferrite one will have a higher Q, but similar impedance.
> >
> >
>
> I'll disagree with you on that Phil,
** Where was the over-sniping error?
Did you even think about it?
> I recently built 5 coils
> using 6" polystyrene pipe coupler as a form.
** That would be 6" diameter - right ?
The fuckwit OP was considering 6" *long* pipe that could enclose a ferrite rod.
The rest of you post was OT, tell me how do you get a 6" dia pipe inside a pocket size transistor radio ?
You are an idiot Mikek.
.... Phil
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| From | Bill Beaty <billb@eskimo.com> |
|---|---|
| Date | 2017-03-16 12:12 -0700 |
| Message-ID | <0fa1f92c-44ac-4e4d-9499-1d641d231a74@googlegroups.com> |
| In reply to | #451909 |
> Which one would capture the most signal at the AM Broadcast frequencies Is your real question , how do we optimize electrically-small 500KHz loop antennas? :) First, for electrically-small resonant antennas, increasing the Q will both narrow the bandwidth as well as increasing the total received microwatts. Between ferrite versus air-core loops, which one has more loss-ohms (including ferrite losses, tuning capacitor slider resistance)? Second, PHYSICAL SIZE makes a big difference. Wind your air-core antenna as a hoop-style, 5ft diameter! Or, use a 5ft ferrite rod with the windings in the center. Both are roughly equivalent (where ideally you'd use 1/2 wavelength, 300 meters @500Khz, not 5ft.)
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