[Elecraft] RE: A Bad Thing Happened To My K2 - Update 1

[Don Wilhelm]

Mark,

Find out where the problem is before digging into anything, it will 
greatly simplify your troubleshooting steps.
Add a capacitor to your antenna, and use it to inject signals into your K2.
Start at the cathode of D6.  Here you should hear a signal and noise - 
keep in mind that there is no filtering of the receiver front end with 
the antenna connected here, and it will respond to anything your antenna 
picks up.
Next, try the W6 jumper (or pin 3 of J13 if you have the K2 amp keying 
kit or the K60XV plugged into J13).  Here you should hear the 40 meter 
band because the bandpass filters are now between the antenna and the 
receiver front end.  The level will not be as loud as at the cathode of 
D6, but should be 'almost as loud'.
If you have good 40 meter reception here, move on, but if not, there is 
something wrong with the 40 meter bandpass filter.
Moving on, next try the W1 jumper (or pin 1 of the K160RX option board 
header).  If you still have 40 meter reception here, the T/R switch is 
good and your problem is in the Low Pass Filter.

Once you have isolated the problem area, the remaining troubleshooting 
steps are greatly simplified.  Right now, based on the information we 
have available, we can only say that the problem lies somewhere in the K2.

If you do not find a definitive answer with the steps above, a similar 
process can be done in transmit using the RF Probe.

73,
Don W3FPR

Mark Saunders, KJ7BS wrote:
> Thanks to everyone for the suggestions.  Here is some more information
> resulting from your suggestions.
>
> I have no measurable RF output on 40m or any meaningful RX on 40m.  
>
> The RX/TX works on all other bands including 160m.
>
> I get the same RX/TX results from ANT1 & ANT2 and main.
>
> I get the same RX results on the receive ANT.
>   
>