Re: New KX1 low power and 20m oscillation

Posted by Don Wilhelm-4 on
URL: http://elecraft.85.s1.nabble.com/New-KX1-low-power-and-20m-oscillation-tp7531133p7539607.html

Stan,

Check the low pass filter components carefully.  It is possible that it
is letting harmonics through.
Make certain that Q7 is working.  Capacitor CA is one of the low pass
filter components that must be in the circuit on transmit.  Q7
effectively grounds one side of that capacitor on transmit.

73,
Don W3FPR


On 5/8/2012 11:16 AM, Stan Gibbs wrote:

> Here is a shot of my KX1's 40m signal:
>
> http://elecraft.365791.n2.nabble.com/file/n7539479/KX1_40m.jpg
>
> Clearly, the signal is much cleaner than 20m.
>
> Here is another shot of the 20m signal at a 2 KHz span:
>
> http://elecraft.365791.n2.nabble.com/file/n7539479/KX1_20m.jpg
>
> Anybody have an idea for the possible source of this modulation?
>

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