[R-390] K601

[David C. Hallam]

Rick,

Have you checked the rectifier CR-801 that supplies the DC for this relay?
K101 and K602 are in parallel when the function switch is in AGC, MGC, or
Squelch.  You should have 14VDC or so on that circuit.  They get their power
from the selenium rectifier and a tap on the filament portion of the power
transformer.  By this time in life approximately 100% of the selenium
rectifiers have failed.  If yours has not failed, replace it anyway.  You
won't like the odor when it does fail.

David
KC2JD

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Rick Brashear
> Sent: Monday, September 11, 2006 4:08 PM
> To: R-390 at mailman.qth.net
> Subject: Re: [R-390] K601
>
>
>
> Hi Roy and all.... thanks for the insight.  I guess I already have the
> squelch function as the label is on the function switch, but it does not
> have an added plate.  It appears to have come from Collins like this.
> Maybe I'm not looking at the right thing.  I have another dilemma.  The
> relay K602 in the sub chassis of the audio module is marked 6 volt DC on
> the coil.  Could it be someone has modified it from the original?
> According to my schematic one side of the coil goes to the plate of the
> squelch amplifier (V601 - pin 1 a 12AU7) and the other side goes to the
> function switch, pin 11, which I believe goes to the calibrated B+ when
> in the agc/etc. position.  I have the module out and it is definitely
> K602 that is chattering.  When I measured it the coil has about 6.7
> volts AC.  This is the relay that is marked 6 volt DC on the coil.  What
> do you guys make of this?  Did a previous owner replace the AC relay
> with a DC relay and when it chattered he just disconnected it?  If so,
> I'm still confused as the coil does not go to the filament supply.
>
> The antenna relay (K101) is grounding the antenna, but it is my
> understanding that it is the break-in relay in conjunction with the
> squelch relay that grounds the audio portion.  I most likely read
> incorrectly.
>
> Thanks,
> Rick/K5IZ
>
>
>
> > Tim and others,
> >
> > Tim has it right. The relay operates on the 6.3 volt AC supply. It
> > draws about 40 ma of current, AC.  Presumably, it would work on DC if
> > rewired, but I don't know what voltage/current....
>
>
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