[Elecraft] K2 low Tx output and insensitive Rx on 20 metres

[Don Wilhelm]

Stan,

When you say the "receive function is off", I trust you mean that the 
RANT menu parameter is set to OFF for 20 meters - that menu setting is 
PER BAND (there is no global ON/OFF setting).  Please check the menu 
while 20 meters is selected.

If RANT is OFF for 20 meters, then let us know if it transmits with full 
power capability on 20 meters.  If not, I would suspect a relay point 
has failed because you said this was a sudden failure - such a relay 
failure will show up on transmit as well as receive.

If the problem is on both transmit and receive, than one of the filters 
is suspect - either the bandpass filter for 20 meters (but why is 30 
meters OK), or the Low Pass Filter (again, why is 30 meters OK), and if 
the KPA100 is installed, the low pass filters in the KPA100 might be the 
problem.
There is also the possibility that the VCO frequency has changed and is 
causing the problem with 20 meters, but that would also cause transmit 
to be faulty on 20 meters.
All the circuits in the K2 for both transmit and receive, other than 
those I have mentioned are *not* frequency selective - if those work on 
one band, they will work on 20 meters too.

If only 20 meter receive is a problem, then I would suspect something in 
your antenna system has failed rather than the K2 - what is unique to 20 
meters in your system?  Look there.

73,
Don W3FPR



Stanley Thompson wrote:
> Sirs
>
> My K2 was working well and suddenly 20 metres has gone wrong. All other bands, including 30 metres are OK. I have 160 metres band installed but the receive antenna function is off. iwould welcome any suggestions!
>
> Thank you
> Stan GI3WTG
>   
>