Hans,
That sounds like the old WAOF (Weird At One Frequency) problem. That is
the region where the PLL oscillator and VFO frequencies "cross paths"
near 7185 kHz. See http://www.elecraft.com/Apps/Alert11_WAOF.html.
Note that this alert refers to older version A K2s, you will not find
C70 on your board.
If this is your problem, the audio signals will sound rather like they
are 'under water' If you have something different, then ask again.
With a new K2 layout, that seldom happens, so check to be certain D16 is
mounted flush with the board.
In addition, the components mounted on the bottom of U4 (C88, RFC15 and
C91) should have leads as short as possible - make certain they are
connected to the correct pins.
You may need to trim all leads in the vicinity of U4 so there is nothing
that would act as an 'antenna'.
73,
Don W3FPR
On 3/26/2014 1:44 PM, Hans Elfelt Bonnesen wrote:
K2 Audio Distortion.
My otherwise flawless K2 # 7359 is found to have
serious audio distortion problems on received and transmitted signals on 40
meter.
The problem appears as soon as I go above 7171 kHz. On 7182 the problem makes
SSB contacts impossible
Lower frequencies do not suffer. Why ?
I still haven’t checked the problem on other bands.
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