[Elecraft] K2 Only 30-metre Band Works

[VA1CQ]

Further troubleshooting of my new K2 build reveals that transmit and 
receive on the 30-metre band works well. But all other bands, transmit 
and receive, don't work.

On transmit on non-working bands, the output signal doesn't make it past 
the output of the band-pass filters (W6). But on 30 metres, the 
band-pass filter output is in the correct range of 25 mV with 5 watts of 
transmit power. On 30 metres, the band-pass coils tune as you would 
expect and I can peak the band on receive and transmit. On receive on 30 
metres, I can hear RTTY, CW and WWV as well as SW stations in the 
31-metre band. On other bands, I hear nothing except on 40 metres at 
night when signals are strongest. I can hear an occasional strong 
station on 40. When transmitting, I am using the DL-1 dummy load.

I am trying to think of what's common among all bands except 30 metres, 
transmit and receive, where a problem could lie. The fact that 30 metres 
works OK confirms that much of the rig is working correctly. Since 30 
and 20 metres share a band-pass filter as well as a low pass filter 
makes this all the more confusing.


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