Scott,
Thanks for the tip. I also am facing a mechanical problem. As you
know, the PA and the SWR/Filter boards are vertically mounted in the
back space. My Argosy has an aluminum spacer-reinforcement that is
bolted to both the back panel of the radio and the heat sink on the top
of the radio. That spacer, on my radio, is fastened to the back panel
by two sheet metal screws on the outside edges and and a bolt & nut
with the nut centered on the spacer facing the front side of the
radio. There is hardly any of the bolt projecting past the nut. When
I turn the nut, the bolt also turns. There is no apparent direct access
to the bolt head, which prevents that spacer from being removed. Did
you or have you for any reason unbolted the heat sink? That would
appear to be the only other easy way to access the two boards. If you
were able to unfasten the heat sink, are the leads long enough to drop
that panel and check the final amplifier board and bias settings with
the heat sink & final Amp board sitting on the bench?
John / WA1JG
On 2/17/2012 11:16 PM, scottsheppard@videotron.ca wrote:
> when I tuned up my Argosy a while ago I did it to spec...I kept getting
> complaints of distorted audio, however...it took me forever (as it often
> does) to find the bias was too low despite d=being what it called for in the
> manual.
>
> Your problem may be simpler in nature and if it was working OK before, its
> unlikely its your PA...that said, have a look if the simpler route does not
> help. When I realized I had to exceed the current limit a bit I simply
> listened in a separate receiver for clear audio...
>
> scott
>
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