Re: KX1: new build & transmit problem on 20m ...

Posted by Don Wilhelm-4 on Jun 05, 2012; 12:34pm
URL: http://elecraft.85.s1.nabble.com/KX1-new-build-transmit-problem-on-20m-tp7557147p7557148.html

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, [hidden email] 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.
>

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