Since this is a used radio, to which you may not have history, I suggest you check the installed filters and determine their location and the required off-set frequency.    See page 48 in the manual, "Filter Frequency Offset".

More details on Configuration is found on page 48 pertaining to Crystal Filter setup.

73

Bob, K4TAX


On 8/19/2021 3:27 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 1
Date: Tue, 17 Aug 2021 21:10:23 +0000 (UTC)
From: Mike Kholodov<michk...@yahoo.com>
To:"elecraft@mailman.qth.net"  <elecraft@mailman.qth.net>
Subject: [Elecraft] K3S audio quality issue
Message-ID:<1346212585.1587787.1629234623...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8

  Listening to the K3S audio had become very fatiguing for me as of late. It 
sounds like hum or carrier is mixed in at the low end. It is very similar to 
the sound, if you tune a little bit higher on USB. I checked the same stations 
on my KX3, they sounded great. Used the same headphones in both cases. Has 
someone had the similar problem and is there any solution before I request the 
official support?
Thanks,Mike, AB3VN

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