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
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