[Elecraft] #4472 transmitter setup problem.

[G3VVT at aol.com]

Jerry,  

Did you use a X10 probe with the scope?
 
The problem could be related to the stub effect at the operating  frequency 
caused by the scope leads and the capacitance the scope input  circuit presents 
to the K2. Particularly with RF a X10 probe or a high  impedance detector is 
just about essential to avoid upsetting the circuit you  are monitoring.
 
The same can apply to checks on the 4MHz clock on the K2 control board  where 
the test instrument such as a counter can cause unwanted effects even  though 
it has a high input impedance.
 
Bob, G3VVT