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QRZ! Ham Radio 13
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QRZ Ham Radio Callsign Database - Volume 13.iso
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fx440.txt
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1999-04-07
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From elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!uunet!world!decwrl!csus.edu!netcom.com!wa2ise Mon Jul 12 08:24:37 PDT 1993
Article: 135 of rec.radio.amateur.homebrew
Newsgroups: rec.radio.amateur.homebrew
Path: elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!uunet!world!decwrl!csus.edu!netcom.com!wa2ise
From: wa2ise@netcom.com (Robert Casey)
Subject: Ramsey FTR-146 and FX-440 squelch mod
Message-ID: <wa2iseC9ys7A.KBA@netcom.com>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Sat, 10 Jul 1993 19:45:09 GMT
Lines: 18
copied from packet:
Subject: Fix for popping squelch!
From: N2AVN@WA2UMX.#ENY.NY.USA.NA
To : RAMSEY@ALLUSA
The Ramsey FTR-146 and the FX-440 use the same audio and squelch set up, which
pops and clicks very loudly as it goes in and out of squelch. The fix I've come
up with softens the squelch control voltage transitions and mutes to a great
degree the objectionable popping.
1) break the land pattern from Q6 to pin #1 of U2 (FX-440) and bridge with
a 1K ohm resistor.
2) parallel c-48 on wire side with a 2.2 uf cap.
Try it you might like it.
73, Norm, N2AVN PS Also hv fix for low Pwr out frm 440.
=============================================================================
Note: I haven't tried or verified this, proceed at your own risk. WA2ISE
"A thousand a week doesn't go far anymore" - George Jetson