[R-390] R-390 Antenna Relay Chatter

[Glenn Little WB4UIV]

I would suspect that the selenium rectifier has gone the way of all 
aging selenium rectifiers and has an increased voltage drop across it.
Change the rectifiers to silicon and add a dropping resistor to get the 
relay voltage in spec and all will be good.
Dropping resistor my not be needed.

73
Glenn
WB4UIV


On 10/7/2022 12:59 PM, Barry wrote:
> When in STANDBY, the antenna relay in my R-390 produces a bit of chatter.  Is this normal?  I see where that relay is fed, unfiltered, from CR801 which, from the pictures in the manual, appear to be a stack of selenium diodes and I'm wondering if that rectifier stack might be a problem.  Anyone know what to expect from that relay in STANDBY and, perhaps, what I'm seeing might be normal?
>
> Thanks,
> Barry - N4BUQ
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-- 
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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIVwb4uiv at arrl.net     AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"