Jim, this is a long shot, but perhaps....
Check the output voltage of the 210 and be sure it is high
enough.
The old Atlas 210x transceiver used to have exactly the same
effect if the voltage dropped below about 12 volts.
I don't know if the Argonaut suffers from this effect or not, but
have a look.
73
Rick
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Dave
Sent: Wednesday, December 17, 2003 6:29 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Argonaut 505
move power supply away from rig some, some TT rigs subject to hum
if
PS too close to one end of rig -
have fun, great little rig
Dave
K8BBM
On Wed, 17 Dec 2003 09:49:10 -0700
"JAMES T HANLON" <knjhanlon@msn.com> wrote:
> 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
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
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