[Elecraft] Re: K2 SSB problem

[zl1aih at ihug.co.nz]

Hi Folks,
K2 #767 has had the KSB2 module installed for several years - tested, but hardly 
used since installation.   Testing today revealed that power output drops from 10w 
to <2w pep after a few words.   Checked voltage readings on the SSB board - all 
OK except AUX BUS remained at 5.6v during transmit, rather than falling to 2.4v as 
per the manual.   After some head-scratching, I changed the display from RF to 
ALC - maybe the output was being reduced?   However, as long as the display is 
on ALC the power output is 10w PEP (Tektronix 2213 60mHz scope across 50 ohm 
dummy load) - AUX BUS drops to 2.4v on transmit.   Changing the display back to 
RF yields >2w output - both conditions are repeatable.   CW operation is not 
affected - steady 10w on the scope whether the display is RF or ALC.  
So far, I haven't figured the link between toggling the display between RF and ALC, 
and power output.   Before I get out of my depth, has anyone else come across this 
problem?
73, Ken