Newsgroups: rec.radio.amateur.misc
From: wa2ise@cbnewsb.cb.att.com (robert.f.casey)
Subject: TS440 receiver audio mods file
Message-ID: <1993Mar24.130853.8959@cbfsb.cb.att.com>
Keywords: mods
Sender: news@cbfsb.cb.att.com
Organization: AT&T
Date: Wed, 24 Mar 1993 13:08:53 GMT
Lines: 29


copied from packet:
 Msg# TSF  Size #Rd  Date  Time From   MsgID        To
38513 BF   1520   0 19-Mar 2236 N2FAM  2890_WA2OLZ  MOD@USBBS ()
 Sb: TS-440 RX Audio Mods


Here's some easy modifications to improve the rx audio fidelity of
Kenwood TS-440's.  All references below are to the IF board
component designations.

* Increase C60 to a .47uf or 1 uf.  This will increase low frequency
response on all modes.

* Decrease C51 to .01 uf.  This will increase high frequency response
on SSB/CW.

* Try removing R263 (tacked on the bottom of the board on my early
production unit).  This will lower in amplitude the audio coming 
out of the detectors and improved the smoothness (a real technical
term) of the audio, especially on AM signals.

And, of course, I take no responsibilty for anything you do to 
your radio.  Be careful.  The IF board on the 440' is about the easiest
one to get at.

73/Dave n2fam@ka3fmo.pa
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Note: I haven't tried or verified this, proceed at your own risk. WA2ISE