[Elecraft] Amplitude variation on K3S with JT65B

[Edward R Cole]

Conrad and all:

Another reason I am glad that I chose the 2.8 KHz and 400 Hz filters 
when I purchased my K3 in 2010.

I do not use the 2nd IF when I run 2m-eme (JT65B under MAP65).  In 
fact I have FL3 open (no filter) and select it in diversity mode to 
reduce zero frequency "suck out" on the MAP65 spectrum screen.  I tap 
off the 1st IF from both main and subRx to feed dual SDR's before the filters.

But running either WSJT-10 or WSJT-X I do use line out audio with 2.8 
KHz filter selected in DATA  Mode.  I  run this on 6m and 23cm  eme.

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It seems that the stock 2.7kHz filter is the culprit. Confirmed 
privately by 2 EME operators and by Jim K9YC. So I will buy a couple 
of Inrad 2.8kHz filters.

73

Conrad PA5Y


73, Ed - KL7UW
   http://www.kl7uw.com
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