On 1/28/2019 8:35 PM, Bwana Bob wrote:
on the power control board was open. I fixed that, but found a short on
the 13.8 V bus. I haven't dug into it yet, but fear that the Astron
supply zapped the finals.
I've got a Paragon here with a short in the RF power amplifier
somewhere. It's strange - the radio will power-on for a few seconds
before current on the supply (proper Ten-Tec supply) ramps up shutting
it off. I know it is in the power amp module - if I disconnect the
heavy gauge red wire to the power amp, it will power-up without any
issues. The power supply is fine - no issues there.
I'm almost thinking that with this behavior, it's not the transistors
themselves, but something goofy in the other components leading to a
turn-on of the finals? Not sure.
I too am wondering if I should fix it or not. Before it broke it was a
good running Paragon - sent and received fine. It's sentimental, it was
my father-in-laws rig before he became an SK suddenly in a motorcycle
wreck. But like some others have already posted, it seems like these
radios have a lot of issues over time so that if I fix the problem in
the finals, what's next?
FWIW, if the problem is in the driver MRF476, haven't found a mainstream
place that sells those yet.
Thanks much and 73,
ben, kd5byb
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