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

[Don Wilhelm]

John,

You will nost likely find the problem in the Low Pass Filter board.  My 
suspicion is that the LPF is not working and letting 2nd and 3rd 
harmonic energy through - and the net effect is modulation of the KX1 
output waveform.

73,
Don W3FPR

On 6/5/2012 8:25 AM, zendoc at netspace.net.au wrote:
>   Hello Group,
>
> I've just completed building KX1 # 2644, including the KXB3080 module,
> and have discovered a problem.
>
> All progress testing and alignment proceeded smoothly to the end of
> both manuals.  But I've noticed that when listening to the KX1's
> transmitted signal (using my K3 as receiver) on 20m only is very
> raspy.  It sounds distorted, with what sounds like another signal
> lower in frequency.  In fact, it sounds a little like that low
> frequency buzzing you hear when you grab the audio plug connected to
> the input of an audio amplifier.
>