[Elecraft] K2 deaf on 40 m

[Don Wilhelm]

Svend,

In that case, try the "Cheap and Dirty Signal Tracing in the K2" that 
you can download from the Elecraft website Builder's Resource page then 
Troubleshooting Tips link.
The direct link is 
http://www.elecraft.com/TechNotes/SigTr/K2%20Cheap%20%27n%20Dirty%20Signal%20Tracing.pdf.

That should reveal whether the problem is with the bandpass filter or 
the low pass filter.

Once you have located the problem area, check the soldering - yes, even 
though it used to work, there could still be an unsoldered or poorly 
soldered connection that has finally developed enough oxidation to now fail.

If the soldering is good, the next item to check is the relay  K1 if the 
problem is in the bandpass filter or K12 in the low pass filter.  Set 
the band to 40 meters and check for continuity directly across the relay 
contacts with your ohmmeter.  The relays are latching, so they can be 
checked after power is removed from the K2. The schematic shows the 
relays in their non-selected position (i.e. when 40 meters is selected, 
there should be continuity between K1 pins 3 and 4, but not pins 2 and 3).

73,
Don W3FPR

Svend Spanget wrote:
> Don,
>
> thank you for answering! This K2 used to work, but after I got my K3, 
> it was left in the background...
> It will tune to a good SWR.
> The K60XV option is not installed.
>
> 73
> Svend, OZ7UV
>
>