[Elecraft] KX-1: Broadcast breakthrough on 20m

[Stephen Prior]

Many thanks Don, I have also had some input from Wayne on this one and have
some things to check with the scope.  I shall combine your reply with his
and see where it takes me.

Thanks again

73 Stephen


On 27/10/2009 21:57, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:

> 
> Stephen,
> 
> The first thing I would suggest is to see if the KX1 is really receiving
> on 20 meters, or perhaps on some other frequency band.  What I am
> thinking is that the firmware chip may not be fully seated in the
> socket, which will cause to DDS output to be on some unknown frequency.
> 
> Another thing that could cause similar problem is a distorted DDS output
> waveshape - check inductors L4 and L5 for damage and capacitors C50, C51
> and C52.
> 
> The other possibility is that the KX1 was actually responding to the
> image.  When tuned to USB at 14.2, the DDS output is 4.9 kHz below the
> received frequency, and there could be leak-through of strong signals
> near 4.4 MHz.
> 
> 73,
> Don W3FPR
>