Y'all,
I just became a new owner of an Argonaut 505, the very first Argonaut and my
first Ten Tec rig. It came with the model 210 power supply. I am noticing a
120 Hz hum on the transmitter note on CW and a corresponding hum on the SSB
signal when I run the rig from the 210. When I power it from a battery there
is no hum. It is most noticable on 40 meters which is where the local
oscillator is tripling, and I don't see a hum on the wave-envelope with my
HP1740A 100 mHz oscilloscope. So it may be FM on the local oscillator.
I would appreciate first of all a circuit diagram for the 210 power supply, and
then of course any suggestions about what to do. It is a really fun little rig
when I run it from the battery.
Thanks,
Jim Hanlon, W8KGI
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