Groups > sci.electronics.design > #740979

Re: new X-chapters

From	Gerhard Hoffmann <dk4xp@arcor.de>
Newsgroups	sci.electronics.design
Subject	Re: new X-chapters
Date	2026-02-25 01:42 +0100
Message-ID	<10nlgh3$nusr$1@solani.org> (permalink)
References	<m0vjpkhr939ddipr24l9i9hps6m30627a4@4ax.com> <mvuor2Ffim8U1@mid.individual.net> <10nf6jd$1i0vh$1@ehsjr.eternal-september.org> <n06g9rFnlhfU1@mid.individual.net> <eoespkhg2b5h5i35385pii69uq312v5nq6@4ax.com>

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Am 25.02.26 um 01:12 schrieb john larkin:

> One of my guys did a JLC proto board. It has edge-launch SMAs. The
> center pin is fat on the cheap connectors, so we have a big pad for
> soldering.
> 
> But that makes a capacitive glitch unless you cut away all the
> interior PCB planes. He didn't.
> 
> I dremeled from the bottom all the way up to remove the layer 3 and 2
> copper pours. Tricky. I was about 3 mils from punching through to the
> other side.
> 
> https://www.dropbox.com/scl/fi/k1fd6i5upfjo7uucq2sx6/X126A_SMAs_Top.jpg?rlkey=871v8n1ng388yz11ibjr1sz2e&raw=1
> 
> https://www.dropbox.com/scl/fi/ubqushwcc19xww9hc5azf/X126A_Dremel_SMA.jpg?rlkey=610uod206u93z4x1iysvwp4n7&raw=1
> 
> Since I replaced the copper and the FR4 with air, the transition went
> from very capacitive to slightly inductive.
Same here.

Solder-friendly pads:
< 
https://www.flickr.com/photos/137684711@N07/51843174578/in/datetaken/lightbox/ 
      >

Z-friendly pads:
< 
https://www.flickr.com/photos/137684711@N07/52973542168/in/datetaken/   >

result is slightly overcompensated:
< 
https://www.flickr.com/photos/137684711@N07/53780597885/in/datetaken/     >

the setup:
< 
https://www.flickr.com/photos/137684711@N07/52973631607/in/datetaken/lightbox/ 
    >


cheers, Gerhard

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Thread

new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-21 10:43 -0800
  Re:new X-chapters Martin Rid <martin_riddle@verison.net> - 2026-02-21 15:25 -0500
    Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-23 11:00 -0800
      Re: new X-chapters Joe Gwinn <joegwinn@comcast.net> - 2026-02-23 14:39 -0500
        Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-23 14:25 -0800
          Re: new X-chapters JM <sunaecoNoChoppedPork@gmail.com> - 2026-02-23 22:42 +0000
            Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-23 14:54 -0800
              Re: new X-chapters Joe Gwinn <joegwinn@comcast.net> - 2026-02-23 20:17 -0500
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-23 19:18 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-24 17:27 +1100
                Re: new X-chapters Joe Gwinn <joegwinn@comcast.net> - 2026-02-24 14:01 -0500
      Re: new X-chapters Lasse Langwadt <llc@fonz.dk> - 2026-02-23 23:23 +0100
        Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-23 19:19 -0800
          Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-24 17:32 +1100
      Re: new X-chapters Joerg <news@analogconsultants.com> - 2026-02-24 14:53 -0800
        Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-24 15:57 -0800
          Re: new X-chapters Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-02-24 19:12 -0500
            Re: new X-chapters "Edward Rawde" <invalid@invalid.invalid> - 2026-02-24 21:04 -0500
              Re: new X-chapters JM <sunaecoNoChoppedPork@gmail.com> - 2026-02-25 02:25 +0000
                Re: new X-chapters "Edward Rawde" <invalid@invalid.invalid> - 2026-02-24 22:28 -0500
                Re: new X-chapters John R Walliker <jrwalliker@gmail.com> - 2026-02-25 08:46 +0000
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-25 09:39 +0000
                Re: new X-chapters JM <sunaecoNoChoppedPork@gmail.com> - 2026-02-26 00:12 +0000
              Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 04:15 -0800
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-25 14:04 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 07:58 -0800
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-25 19:31 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 14:13 -0800
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-25 22:51 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 16:30 -0800
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-26 09:57 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-26 08:22 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-27 03:51 +1100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-26 09:03 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-27 17:04 +1100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-27 03:45 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-28 03:56 +1100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-27 10:18 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-28 17:29 +1100
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-26 22:51 +1100
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-26 22:49 +1100
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-26 22:44 +1100
                Re: new X-chapters Glen Walpert <nospam@null.void> - 2026-02-25 18:44 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 14:24 -0800
                Re: new X-chapters Jan Panteltje <alien@comet.invalid> - 2026-02-26 07:11 +0000
            Re: new X-chapters Jan Panteltje <alien@comet.invalid> - 2026-02-25 06:52 +0000
              Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 09:58 -0800
                Re: new X-chapters Jan Panteltje <alien@comet.invalid> - 2026-02-26 07:06 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-26 08:32 -0800
                Re: new X-chapters Jan Panteltje <alien@comet.invalid> - 2026-02-26 17:52 +0000
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-27 17:26 +1100
                Re: new X-chapters Jan Panteltje <alien@comet.invalid> - 2026-02-27 13:31 +0000
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-27 09:48 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-27 10:15 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-28 05:20 +1100
                Re: new X-chapters Jeroen Belleman <jeroen@nospam.please> - 2026-02-27 21:09 +0100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-27 20:01 -0800
                Re: new X-chapters Gerhard Hoffmann <dk4xp@arcor.de> - 2026-02-28 10:22 +0100
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-03-01 01:08 +1100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-28 07:51 -0800
                Re: new X-chapters Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-02-28 12:48 -0500
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-28 10:07 -0800
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-02-27 21:02 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-27 14:28 -0800
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-28 17:38 +1100
                Re: new X-chapters Gerhard Hoffmann <dk4xp@arcor.de> - 2026-02-28 10:17 +0100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-28 07:52 -0800
                Re: new X-chapters Jim Jackson <jj@franjam.org.uk> - 2026-02-28 22:35 +0000
                Re: new X-chapters Jim Jackson <jj@franjam.org.uk> - 2026-02-28 12:30 +0000
                Re: new X-chapters Bill Sloman <bill.sloman@ieee.org> - 2026-02-28 23:53 +1100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-28 07:53 -0800
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-01 19:58 +0000
                Re: new X-chapters Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-03-01 20:16 +0000
                Re: new X-chapters liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-01 21:37 +0000
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-03-01 13:43 -0800
                Re: new X-chapters antispam@fricas.org (Waldek Hebisch) - 2026-02-28 14:07 +0000
        Re: new X-chapters Joe Gwinn <joegwinn@comcast.net> - 2026-02-24 20:15 -0500
  Re: new X-chapters Joerg <news@analogconsultants.com> - 2026-02-21 14:10 -0800
    Re: new X-chapters ehsjr <ehsjr@verizon.net> - 2026-02-22 10:15 -0500
      Re: new X-chapters Joerg <news@analogconsultants.com> - 2026-02-24 12:34 -0800
        Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-24 16:12 -0800
          Re: new X-chapters Gerhard Hoffmann <dk4xp@arcor.de> - 2026-02-25 01:42 +0100
            Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-24 19:44 -0800
              Re: new X-chapters Gerhard Hoffmann <dk4xp@arcor.de> - 2026-02-25 11:28 +0100
                Re: new X-chapters john larkin <jl@glen--canyon.com> - 2026-02-25 03:57 -0800

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