[Elecraft] KX1: new build & transmit problem on 20m ...

[Stan Gibbs]

VK7JB wrote
> 
> But I've noticed that when listening to the KX1's transmitted signal
> (using my K3 as receiver) on 20m only is very raspy.
> 

John,

I had a similar experience to you (though without the 30/80 module).  My P3
showed strong 60Hz modulation of the output signal on 20m and a much smaller
modulation on 40m (not audible).  The audio on 20m was definitely "raspy".

The KX1 was connected to a dummy load via 25 ft. of RadioShack RG58 and I
had no antenna on the K3.  I thought the modulation was an oscillation at
first, but after monitoring the KX1 output signal on my scope, I realized
that the modulation had to be due to some other cause, and I suspected RFI
in the power supply or cables because of the 60Hz sideband spacing.

I changed my coax to a 3 ft piece of RG213.  The 20m signal immediately
became clean on my K3.  The longer the coax, the more apparent modulation of
the received signal.

All signal reports that I received from QSOs gave me a clean tone report and
I asked several ops whether there was any hum or buzz on my 20m signal. 
Nobody reported any modulation.

Do you have a scope to look at the KX1 output?  If not, you might want to
get some on-air reports to determine if there is a real problem in the
transmitted signal.



-----
73, Stan - KR7C
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