[Elecraft] Getting the sub to work on 20M

[Gary Smith]

K3 & sub Rx installed.

I rarely use the Rx antenna on the upper bands but today went to work 
TN2T on 20 SSB to work split and discovered I don't hear anything Rf 
wise coming from the sub Rx. I have no problems with the sub hearing 
independently on the other bands & used it to find the right split on 
10M & it works fine on the lower bands, seems like it's confined to 
20M.

Any ideas if there's anything I can check to see if it's not set up 
right?

Thanks,

Gary
KA1J