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Groups > sci.electronics.design > #450540 > unrolled thread
| Started by | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| First post | 2017-03-06 16:51 -0800 |
| Last post | 2017-03-11 21:04 -0500 |
| Articles | 20 on this page of 96 — 20 participants |
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RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-06 16:51 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 18:01 -0800
Re: RF bipolars RIP Gerhard Hoffmann <ghf@hoffmann-hochfrequenz.de> - 2017-03-07 03:19 +0100
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-06 18:25 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-06 19:03 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 19:11 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-06 20:40 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 07:28 -0800
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-06 18:31 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-06 20:44 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 10:17 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 08:08 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 12:15 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 09:30 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 09:33 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 12:44 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 17:53 +0000
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 10:59 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:06 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 11:16 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 15:11 -0600
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:30 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:47 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:55 -0800
Re: RF bipolars RIP Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-03-08 11:50 +0100
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 16:36 -0800
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-08 04:40 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-08 06:24 -0800
Re: RF bipolars RIP dplatt@coop.radagast.org (Dave Platt) - 2017-03-07 16:55 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-08 06:40 -0800
Re: RF bipolars RIP Piotr Wyderski <no@mail.com> - 2017-03-09 07:10 +0100
Re: RF bipolars RIP dplatt@coop.radagast.org (Dave Platt) - 2017-03-10 21:32 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 22:57 -0600
Re: RF bipolars RIP, grab em while you can Winfield Hill <hill@rowland.harvard.edu> - 2017-03-09 04:05 -0800
Re: RF bipolars RIP, grab em while you can pcdhobbs@gmail.com - 2017-03-09 04:44 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 17:50 +0000
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:08 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 11:09 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 14:34 -0500
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 15:40 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-07 20:41 +0000
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 13:08 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 15:14 -0600
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-07 16:17 -0500
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-07 23:09 -0600
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-07 21:34 -0800
Re: RF bipolars RIP "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-08 14:24 -0600
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-08 13:10 -0800
Re: RF bipolars RIP "Michael A. Terrell" <mike.terrell@earthlink.net> - 2017-03-09 14:19 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-09 22:10 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 11:50 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 17:27 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 12:52 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 19:01 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 15:19 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 21:42 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-10 17:52 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-10 23:38 +0000
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-10 17:38 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 10:23 +0000
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-11 03:30 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 12:50 +0000
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 10:49 -0500
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 15:55 +0000
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 11:45 -0500
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 16:50 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 08:58 -0800
Re: RF bipolars RIP Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-11 16:52 -0500
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-10 18:08 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 07:47 -0800
Re: RF bipolars RIP Cursitor Doom <curd@notformail.com> - 2017-03-11 15:56 +0000
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 09:02 -0800
Re: RF bipolars RIP "Michael A. Terrell" <mike.terrell@earthlink.net> - 2017-03-10 13:28 -0500
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-08 04:35 -0800
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 14:05 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:33 -0800
Re: RF bipolars RIP George Herold <gherold@teachspin.com> - 2017-03-07 15:40 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 16:44 -0800
Re: RF bipolars RIP Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-03-08 10:19 +0200
Re: RF bipolars RIP Winfield Hill <hill@rowland.harvard.edu> - 2017-03-08 04:30 -0800
Re: RF bipolars RIP Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> - 2017-03-08 15:38 +0200
Re: RF bipolars RIP Robert Baer <robertbaer@localnet.com> - 2017-03-09 23:50 -0800
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-10 05:39 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-10 07:15 -0800
Re: RF bipolars RIP "Kevin Aylward" <kevinRemovAT@kevinaylward.co.uk> - 2017-03-07 21:55 +0000
Re: RF bipolars RIP Joerg <news@analogconsultants.com> - 2017-03-07 14:10 -0800
Re: RF bipolars RIP John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-07 14:43 -0800
Re: RF bipolars RIP Tim Wescott <tim@seemywebsite.really> - 2017-03-10 23:54 -0600
Re: RF bipolars RIP pcdhobbs@gmail.com - 2017-03-11 04:32 -0800
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 07:54 -0800
Re: RF bipolars RIP krw@notreal.com - 2017-03-11 11:15 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 09:17 -0800
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 15:11 -0500
Re: RF bipolars RIP John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-11 14:22 -0800
Re: RF bipolars RIP "tom" <tmiller11147@verizon.net> - 2017-03-11 21:11 -0500
Re: RF bipolars RIP krw@notreal.com - 2017-03-11 21:04 -0500
Page 4 of 5 — ← Prev page 1 2 3 [4] 5 Next page →
| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-11 03:30 -0800 |
| Message-ID | <1854d912-f599-49e3-b1eb-d17b89abe959@googlegroups.com> |
| In reply to | #451295 |
>> Not even that. The meter movement is so sticky that you have to keep >> thumping it. >So.. what do you use it for, since it seems to be good for nothing? (pregnant pause) Nothing! Cheers Phil Hobbs
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| From | Cursitor Doom <curd@notformail.com> |
|---|---|
| Date | 2017-03-11 12:50 +0000 |
| Message-ID | <oa0rqk$qmf$1@dont-email.me> |
| In reply to | #451299 |
On Sat, 11 Mar 2017 03:30:22 -0800, pcdhobbs wrote: > (pregnant pause) > Nothing! Then why is it taking up valuable lab space? You should bin it.
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| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Date | 2017-03-11 10:49 -0500 |
| Message-ID | <grGdndzDk_LtgVnFnZ2dnUU7-SmdnZ2d@supernews.com> |
| In reply to | #451301 |
On 03/11/2017 07:50 AM, Cursitor Doom wrote: > On Sat, 11 Mar 2017 03:30:22 -0800, pcdhobbs wrote: > >> (pregnant pause) >> Nothing! > > Then why is it taking up valuable lab space? You should bin it. > It's a drop in the bucket among the things that are taking up valuable lab space, e.g. HP 8568 spectrum analyzer parts mules, a Tek 466 analogue storage scope that I kid myself that I'll fix one day, .... ;) There are two Simpson VTVMs on the same shelf as the Avo 16. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
[toc] | [prev] | [next] | [standalone]
| From | Cursitor Doom <curd@notformail.com> |
|---|---|
| Date | 2017-03-11 15:55 +0000 |
| Message-ID | <oa16lf$qmf$2@dont-email.me> |
| In reply to | #451312 |
On Sat, 11 Mar 2017 10:49:04 -0500, Phil Hobbs wrote: > It's a drop in the bucket among the things that are taking up valuable > lab space, e.g. HP 8568 spectrum analyzer parts mules, a Tek 466 > analogue storage scope that I kid myself that I'll fix one day, .... ;) Er, yes. Well you may remember that I have one of those awaiting a fix- up. They've recently become unaccountably popular this side of the pond and as a result I keep losing the ones I see on Ebay to other people who are continually willing to pay more, it seems. Sigh. I only hope the main toob is sound on mine. Everything else that may be faulty I can overcome, but not a main toob!
[toc] | [prev] | [next] | [standalone]
| From | "tom" <tmiller11147@verizon.net> |
|---|---|
| Date | 2017-03-11 11:45 -0500 |
| Message-ID | <oa19e2$sv1$1@dont-email.me> |
| In reply to | #451315 |
"Cursitor Doom" <curd@notformail.com> wrote in message news:oa16lf$qmf$2@dont-email.me... > On Sat, 11 Mar 2017 10:49:04 -0500, Phil Hobbs wrote: > >> It's a drop in the bucket among the things that are taking up valuable >> lab space, e.g. HP 8568 spectrum analyzer parts mules, a Tek 466 >> analogue storage scope that I kid myself that I'll fix one day, .... ;) > > Er, yes. Well you may remember that I have one of those awaiting a fix- > up. They've recently become unaccountably popular this side of the pond > and as a result I keep losing the ones I see on Ebay to other people who > are continually willing to pay more, it seems. Sigh. I only hope the main > toob is sound on mine. Everything else that may be faulty I can overcome, > but not a main toob! Simmconn has an affordable LCD upgrade for the 85662 IF/Display unit. Much better than the tube in any condition plus about 10 pounds lighter. http://simmconnlabscom.ipage.com/store/page2.html Makes the 8566/68 into a more modern SA. Regards
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| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Date | 2017-03-11 16:50 -0500 |
| Message-ID | <ZaGdnY_aHeVD7VnFnZ2dnUU7-KHNnZ2d@supernews.com> |
| In reply to | #451323 |
On 03/11/2017 11:45 AM, tom wrote: > "Cursitor Doom" <curd@notformail.com> wrote in message > news:oa16lf$qmf$2@dont-email.me... >> On Sat, 11 Mar 2017 10:49:04 -0500, Phil Hobbs wrote: >> >>> It's a drop in the bucket among the things that are taking up valuable >>> lab space, e.g. HP 8568 spectrum analyzer parts mules, a Tek 466 >>> analogue storage scope that I kid myself that I'll fix one day, .... ;) >> >> Er, yes. Well you may remember that I have one of those awaiting a fix- >> up. They've recently become unaccountably popular this side of the pond >> and as a result I keep losing the ones I see on Ebay to other people who >> are continually willing to pay more, it seems. Sigh. I only hope the main >> toob is sound on mine. Everything else that may be faulty I can overcome, >> but not a main toob! > > Simmconn has an affordable LCD upgrade for the 85662 IF/Display unit. Much > better than the tube in any condition plus about 10 pounds lighter. > > http://simmconnlabscom.ipage.com/store/page2.html > > Makes the 8566/68 into a more modern SA. > > Regards > > Thanks. I have a couple of pretty bright 85662As, and can get another one for the price of those upgrades if I need it. I'll probably branch out into 70000-series territory next, because they have tracking generators. Not till next year, probably. 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 | 2017-03-11 08:58 -0800 |
| Message-ID | <5na8cc1c4d89cujb9m6nh2bsd865qq9pog@4ax.com> |
| In reply to | #451312 |
On Sat, 11 Mar 2017 10:49:04 -0500, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote: >On 03/11/2017 07:50 AM, Cursitor Doom wrote: >> On Sat, 11 Mar 2017 03:30:22 -0800, pcdhobbs wrote: >> >>> (pregnant pause) >>> Nothing! >> >> Then why is it taking up valuable lab space? You should bin it. >> > >It's a drop in the bucket among the things that are taking up valuable >lab space, e.g. HP 8568 spectrum analyzer parts mules, a Tek 466 >analogue storage scope that I kid myself that I'll fix one day, .... ;) > >There are two Simpson VTVMs on the same shelf as the Avo 16. > >Cheers > >Phil Hobbs Tell me about it. I have four Tek 547s, one 545, and one 535, with about 50 plugins. And a gigantic HP185 sampler with plugins. A big Fluke differential voltmeter. A bunch of GR RF stuff. More misc stuff. I can't bear to just tip them into the dumpster and may never get around to restoring them. Fortunately we're moving to a new facility with a huge crawl-space storage area. Or unfortunately. I don't miss analog scopes or instruments with needles. But my Keithley electrometer is wonderful. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
|---|---|
| Date | 2017-03-11 16:52 -0500 |
| Message-ID | <ZaGdnY7aHeWt7FnFnZ2dnUU7-KFQAAAA@supernews.com> |
| In reply to | #451327 |
On 03/11/2017 11:58 AM, John Larkin wrote: > On Sat, 11 Mar 2017 10:49:04 -0500, Phil Hobbs > <pcdhSpamMeSenseless@electrooptical.net> wrote: > >> On 03/11/2017 07:50 AM, Cursitor Doom wrote: >>> On Sat, 11 Mar 2017 03:30:22 -0800, pcdhobbs wrote: >>> >>>> (pregnant pause) >>>> Nothing! >>> >>> Then why is it taking up valuable lab space? You should bin it. >>> >> >> It's a drop in the bucket among the things that are taking up valuable >> lab space, e.g. HP 8568 spectrum analyzer parts mules, a Tek 466 >> analogue storage scope that I kid myself that I'll fix one day, .... ;) >> >> There are two Simpson VTVMs on the same shelf as the Avo 16. >> >> Cheers >> >> Phil Hobbs > > Tell me about it. I have four Tek 547s, one 545, and one 535, with > about 50 plugins. And a gigantic HP185 sampler with plugins. A big > Fluke differential voltmeter. A bunch of GR RF stuff. More misc stuff. > I can't bear to just tip them into the dumpster and may never get > around to restoring them. > > Fortunately we're moving to a new facility with a huge crawl-space > storage area. Or unfortunately. > > I don't miss analog scopes or instruments with needles. But my > Keithley electrometer is wonderful. Analogue meters are very useful for tweaking up stuff. For actual measurements they're a lot less useful. 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 | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-10 18:08 -0800 |
| Message-ID | <598d8494-c01b-4f2e-b094-07e567ace40b@googlegroups.com> |
| In reply to | #451223 |
On Friday, March 10, 2017 at 5:50:47 PM UTC-5, Phil Hobbs wrote: > On 03/10/2017 04:42 PM, Cursitor Doom wrote: > > On Fri, 10 Mar 2017 15:19:12 -0500, Phil Hobbs wrote: > > > >> http://www.radiomuseum.org/r/avo_avometer_16.html > > > > Well I never! Never ever seen one of those. You've rendered me > > speechless, Phil. I wonder what it's worth.... > > > > If it's over $10, I'll sell. It's worthless for measurements. Art object? An old TEK tube 'scope, with the blue panel sides off is a beautiful thing. Even if it doesn't work. George H. > > Cheers > > Phil Hobbs > > -- > Dr Philip C D Hobbs > Principal Consultant > ElectroOptical Innovations LLC > Optics, Electro-optics, Photonics, Analog Electronics > > 160 North State Road #203 > Briarcliff Manor NY 10510 > > hobbs at electrooptical dot net > http://electrooptical.net
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-11 07:47 -0800 |
| Message-ID | <6u68cct9g6ukl469oekhfgbjdhcc4aqleh@4ax.com> |
| In reply to | #451207 |
On Fri, 10 Mar 2017 15:19:12 -0500, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote: >On 03/10/2017 02:01 PM, Cursitor Doom wrote: >> On Fri, 10 Mar 2017 12:52:03 -0500, Phil Hobbs wrote: >> >>> Yup. It's this oblong white and baby blue thing. Nice enough looking, >>> but nowhere near the quality of the Model 8. I'm not in the lab today, >>> or I'd post a picture. >> >> Ah, you're talking of something made very recently by the sound of >> things. A pic would be most welcome if you get the opportunity. >> > >http://www.radiomuseum.org/r/avo_avometer_16.html > >Cheers > >Phil Hobbs Wow, that's ugly. Looks like an Edsel of similar vintage. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | Cursitor Doom <curd@notformail.com> |
|---|---|
| Date | 2017-03-11 15:56 +0000 |
| Message-ID | <oa16o1$qmf$3@dont-email.me> |
| In reply to | #451311 |
On Sat, 11 Mar 2017 07:47:21 -0800, John Larkin wrote: > Wow, that's ugly. Looks like an Edsel of similar vintage. It doesn't resemble any AVO I've ever seen before I must say.
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2017-03-11 09:02 -0800 |
| Message-ID | <t7b8cct9gj3j9q9i4nf4fnbak25o1ovd6g@4ax.com> |
| In reply to | #451317 |
On Sat, 11 Mar 2017 15:56:49 -0000 (UTC), Cursitor Doom <curd@notformail.com> wrote: >On Sat, 11 Mar 2017 07:47:21 -0800, John Larkin wrote: > >> Wow, that's ugly. Looks like an Edsel of similar vintage. > >It doesn't resemble any AVO I've ever seen before I must say. Somebody probably hired an industrial designer. Never hire an industrial designer. One of my customers did that and wound up with an ICCD camera that looked like a cheap rice cooker. They eventually redesigned it to look more dignified. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | "Michael A. Terrell" <mike.terrell@earthlink.net> |
|---|---|
| Date | 2017-03-10 13:28 -0500 |
| Message-ID | <mI2dnRQMF9f5bV_FnZ2dnUU7-Q2dnZ2d@earthlink.com> |
| In reply to | #451054 |
Cursitor Doom wrote:
> On Thu, 09 Mar 2017 14:19:06 -0500, Michael A. Terrell wrote:
>
>> The last Distributed amplifier I worked with used 16 6146 tubes in a
>> DC to 5 MHz video amp to modulate a TV transmitter. It was real fun
>> matching a set of 16 tubes.
>
> What did you use to do that? I have an old AVO valve (toob) tester
> somewhere; fantastic piece of kit it is, must have cost a fortune when
> first made. One day I'll get around to recommissioning it as I have a lot
> of toobs to evaluate for future sale. I've got the AVO transistor tester
> as well, too. That's another jaw-dropping piece of equipment. That old
> vintage stuff just screams quality.
It was one of the better Hickok models. It belonged to the TV
station, and the power transformer shorted out while I was rebuilding
the transmitter. I couldn't find another in that town, around 1990.
--
Never piss off an Engineer!
They don't get mad.
They don't get even.
They go for over unity! ;-)
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| From | pcdhobbs@gmail.com |
|---|---|
| Date | 2017-03-08 04:35 -0800 |
| Message-ID | <c31ec72f-983c-4cba-a6e0-857910b916e6@googlegroups.com> |
| In reply to | #450759 |
>> Peaking coils only get you a factor of 1.4 (series peaking) to 2.8 >> (constant resistance T-coil). Not chopped liver, but not a factor of 8 >> either. > >That it's > 1.000 proves my point, so that's good enough for a pedant like >me. :^) > >It's actually slightly better than that even, if you go to higher and higher >order networks. There's a theorem of Bode's to the effect that if you start with a parallel RC, the matching network has to obey 1/(2 pi RC) >= -integral (0 to inf) ln(1-|Gamma|), Where Gamma is the insertion gain. (I'm not 100% sure I'm quoting that right--it's in my book someplace.) There are more complicated versions for more complicated sources, iirc due to Darlington and other folks. In any case, you can get a bunch more bandwidth by relaxing the return loss spec, but you use up your allowance fast if the mismatch isn't fairly uniform. T-coils separate the R and C, so they obey somewhat different rules and are generally better than LC peaking networks in the time domain. Fun stuff, and sometimes very useful. Cheers Phil Hobbs
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| From | Joerg <news@analogconsultants.com> |
|---|---|
| Date | 2017-03-07 14:05 -0800 |
| Message-ID | <ei8p5gFtfpnU1@mid.individual.net> |
| In reply to | #450686 |
On 2017-03-07 13:14, Tim Williams wrote: > "John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message > news:8s7ubcl98juos79sdn3anj583e5dspdti0@4ax.com... >> It's a SOT89 5 GHz PNP. Output capacitance is 2 pF. I work wideband, >> time domain, so I can't tune out capacitance. > > Tsk... > > Truly, the art of the peaking coil has been long lost... > > (Not that you necessarily want to do it in a production setting, but > hey, you're the one conflating "can't" with "won't". ;-) ) > What is nowadays considered full-blown voodoo is when you break off a piece of ferrite, dip into into a drop of liquid nails construction glue because that's what they had around, stick it next to a trace and suddenly everything miraculously quiets down. "What's that pill you glued in there?" ... "Oh, that? Soylent Green". -- Regards, Joerg http://www.analogconsultants.com/
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 14:33 -0800 |
| Message-ID | <e5dubclpobquh84egri7shf3m3sgahad2p@4ax.com> |
| In reply to | #450686 |
On Tue, 7 Mar 2017 15:14:07 -0600, "Tim Williams" <tiwill@seventransistorlabs.com> wrote: >"John Larkin" <jjlarkinxyxy@highlandtechnology.com> wrote in message >news:8s7ubcl98juos79sdn3anj583e5dspdti0@4ax.com... >> It's a SOT89 5 GHz PNP. Output capacitance is 2 pF. I work wideband, >> time domain, so I can't tune out capacitance. > >Tsk... > >Truly, the art of the peaking coil has been long lost... Oh, I'm doing that already. 2 pF is a heap of capacitance, and every picosecond counts. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | George Herold <gherold@teachspin.com> |
|---|---|
| Date | 2017-03-07 15:40 -0800 |
| Message-ID | <7013655a-c13b-4c5d-9983-c6268192799f@googlegroups.com> |
| In reply to | #450683 |
On Tuesday, March 7, 2017 at 4:08:42 PM UTC-5, John Larkin wrote: > On Tue, 7 Mar 2017 20:41:20 -0000 (UTC), Cursitor Doom > <curd@notformail.com> wrote: > > >On Tue, 07 Mar 2017 11:09:50 -0800, John Larkin wrote: > > > >What was so special about the actual trannie you were speaking about? I > >mean your emphasis on it being a 600mW device? Why is that such a big > >deal? There are plenty of RF trannies that can dissipate that sort of > >power. > > It's a SOT89 5 GHz PNP. Output capacitance is 2 pF. I work wideband, > time domain, so I can't tune out capacitance. > > Thing is, I can't find an equivalent anywhere. There is some 600 MHz > Ft stuff, but that's too slow. The SOT23 types would fry at 600 mW. > > I wonder how much power a SOT23 or SC70 transistor could dissipate > with radical top-and-bottom heat sinking. Gotta try that. I soldered a flap of copper tape across the top of a power opamp with a heat pad.. soic-8, it helped some. George H. > > > > > -- > > John Larkin Highland Technology, Inc > picosecond timing precision measurement > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com
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| From | John Larkin <jjlarkinxyxy@highlandtechnology.com> |
|---|---|
| Date | 2017-03-07 16:44 -0800 |
| Message-ID | <egkubchpvmjvivjbd1kcvopn92jkqdusoo@4ax.com> |
| In reply to | #450724 |
On Tue, 7 Mar 2017 15:40:03 -0800 (PST), George Herold <gherold@teachspin.com> wrote: >On Tuesday, March 7, 2017 at 4:08:42 PM UTC-5, John Larkin wrote: >> On Tue, 7 Mar 2017 20:41:20 -0000 (UTC), Cursitor Doom >> <curd@notformail.com> wrote: >> >> >On Tue, 07 Mar 2017 11:09:50 -0800, John Larkin wrote: >> > >> >What was so special about the actual trannie you were speaking about? I >> >mean your emphasis on it being a 600mW device? Why is that such a big >> >deal? There are plenty of RF trannies that can dissipate that sort of >> >power. >> >> It's a SOT89 5 GHz PNP. Output capacitance is 2 pF. I work wideband, >> time domain, so I can't tune out capacitance. >> >> Thing is, I can't find an equivalent anywhere. There is some 600 MHz >> Ft stuff, but that's too slow. The SOT23 types would fry at 600 mW. >> >> I wonder how much power a SOT23 or SC70 transistor could dissipate >> with radical top-and-bottom heat sinking. Gotta try that. > >I soldered a flap of copper tape across the top of a power opamp with >a heat pad.. soic-8, it helped some. It wouldn't take a big heat sink on top to seriously increase the surface area. On the bottom, one could extend the collector contact into a pour, around and under the part. No solder mask underneath. Maybe a dab of epoxy to close the air gap. To measure that, I guess I'd have to use the pulsed Vbe trick, to get the actual junction temperature. Grounded-base maybe. Sounds like fun. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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| From | Mikko OH2HVJ <mikko.syrjalahti@nospam.fi> |
|---|---|
| Date | 2017-03-08 10:19 +0200 |
| Message-ID | <m2efy8qixr.fsf@nospam.fi> |
| In reply to | #450683 |
John Larkin <jjlarkinxyxy@highlandtechnology.com> writes: > Thing is, I can't find an equivalent anywhere. There is some 600 MHz > Ft stuff, but that's too slow. The SOT23 types would fry at 600 mW. Has anyone tried thermally conductive potting to kee Tj down ? We did some impressive tests for an Atex/IECEx design, like dissipating 6.5W from TSSOP8. Silicone based compound was also easy to pry off, unlike epoxy-based one. -- mikko
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| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Date | 2017-03-08 04:30 -0800 |
| Message-ID | <o9otgt01vek@drn.newsguy.com> |
| In reply to | #450767 |
Mikko OH2HVJ wrote...
>
> Has anyone tried thermally conductive potting to keep
> Tj down? We did some impressive tests for an Atex/
> IECEx design, like dissipating 6.5W from TSSOP8.
> Silicone based compound was also easy to pry off,
> unlike epoxy-based one.
What kind of thermally conductive epoxy did you use?
--
Thanks,
- Win
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