[Elecraft] 20 meter problem on new K2

[G3VVT at aol.com]

A proper signal generator is just about essential to do the job. The  problem 
is that you need a fair amount of signal to get any indication  on the 
average oscilloscope. The normal method is to use an RF  millvoltmeter to trace the 
path. You can use the Elecraft provided RF probe and  a DVM providing you can 
inject an on frequency signal  of sufficient level to work through the RX 
bandpass filters, etc.  Elecraft give a figure of 140mV from the signal generator 
to carry out this  test
 
There is a good description how to go about it in the rev F, K2 manual  
Appendix E, Troubleshooting page 11.
 
It is possible under extreme circumstances to use a TX into a dummy load as  
a signal source, but needs extreme care how you would extract sufficient level 
 without smoking the RX front end. Much better to use a suitable signal  
generator.
 
Bob, G3VVT