At 03:35 PM 5/30/2017, Josh Gibbs wrote:
The hum totally
disappears when running on external 12VDC, but the transmitter can not be
operated due to lack of 23V unregulated power required for the T/R switch.
Josh: I'm not sure about this T/R switch question. Years ago I used to run
my C-21 mobile by backfeeding the 12V Aux socket from the auto's 13.8
V battery.
(through fusing, of course)
Worked fine. The only problem was that the amp collector current
meter in the PS was bypassed and did not indicate anything.
I must confess, however, upon first hooking up the rig in the vehicle I cranked
up the drive to where I thought it should be and had a few contacts. When
I decided to put the Bird meter on it to see what the actual output I
was shocked
to see 70 watts! :-[ Whoops! However no damage to the C-21.... a truly
rugged rig!
Needless to say, this did not happen again... I marked the drive pot
at 35 watts
output for the extent of it's mobile operation. Eventually installed
a TT Scout
in it's place... (with the magnetic breaker in the A+ lead)
Still have the trusty C-21 in the shack.
Perry w8au
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