[Collins] muting a 51J4?

[C E]

Hi Eugene:
Sorry but you do have to supply 12 volts to mute the
J4. However, this is simpler than others would care to
admit. W3BYM (Tony Marcello) wrote an article in
Electric Radio on exactly how to do this. He tapped
off the filament line and using a voltage doubler,
used this supply to key the relay. 

The J series radios are, unfortunately, not the types
that you simply slave to a relay (unlike the 75A
series, which you can).

I hope this helps. Have a great time operating once
you solve this techical "speedbump."

Cal, N6KYR/8
Lansing, Michigan 

--- Eugene Hertz <ehertz at tcaf.org> wrote:

> Hi All. I am getting ready to get my 51J4 up and
> running as my receiver for my shack.  I am getting
> my TR relay and other stuff set up. I am trying to
> understand how to mute the J4 upon transmitting. I
> read the manual and was wondering if someone could
> confirm that in order to mute, I need to apply 12V
> between contacts #2 and #3 on the strip at the back?
> 
> I was really hoping that simply grounding one of the
> connections would do the trick. That sounds so much
> more civilized than having to make a source of
> 12vdc.
> 
> Anyone confirm?
> 
> thanks
> Eugene
> 
> 
> 
>
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