[R-390] R-390 Antenna Relay Chatter

[Barry]

Jacques, 

I had noted that the relay is specified at 6VDC which I found just a bit odd given the voltage it's being supplied; however, I also presumed that the coil might be satisfied with a full-wave rectified signal like it's getting even though P-P is much higher. I'll take a look at the voltage and see about adding a resistor. 

Other folks referred to that rectifier as selenium but I had missed that designation in the manual. Thanks for that. 

Barry - N4BUQ 

> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "n4buq" <n4buq at knology.net>
> Cc: "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Friday, October 21, 2022 2:12:08 PM
> Subject: RE: [R-390] R-390 Antenna Relay Chatter

> Hi Barry,

> Due to the increased efficiency of the silicon bridge, you may have to add a
> resistor in series with the relay coil to limit the current.

> This will also lower the 120Hz noise…

> The relay is originally specified for 6Vdc:

> And, BTW, the original rectifier is not a selenium one:

> Just measure the coil DC voltage when activated and adjust the resistor value
> accordingly.

> 6.5Vdc will be right on target.

> 73, Jacques, VE2JFE in Montreal

> -----Message d'origine-----
> De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la part de
> Barry
> Envoyé : 21 octobre 2022 14:32
> À : R-390 Mailing List <r-390 at mailman.qth.net>
> Objet : Re: [R-390] R-390 Antenna Relay Chatter

> After replacing the selenium rectifier with a full-wave silicon bridge, the
> antenna relay is no longer chattering. Truthfully, I'm not certain the
> chattering was the old rectifier and was, more likely, a failing FL101;
> however, now that I can power up around FL101, the antenna relay still gives
> off a distinct buzzing sound. Since it's being fed a rippled 120Hz DC, is that
> expected?

> Thanks,

> Barry - N4BUQ

> ----- Original Message -----

> > From: "n4buq" < [ mailto:n4buq at knology.net | n4buq at knology.net ] >

>> To: "R-390 Mailing List" < [ mailto:r-390 at mailman.qth.net |
> > r-390 at mailman.qth.net ] >

> > Sent: Friday, October 7, 2022 11:59:10 AM

> > Subject: R-390 Antenna Relay Chatter

> > 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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