[Collins] Side tone with Collins original S Line

[Dr. Gerald N. Johnson]

Took three months to get through the list.

I see from the schematics, that the 32S-1 has no adjustment of sidetone 
level. Its connected directly to the audio volume control in the 
receiver. I'd mount a 500K or 1M pot in a shielded box with a pair of 
shielded cables with RCA phono plugs on the other ends. Not to say the 
shielded box couldn't have a couple RCA phono jacks. Wire the pot as a 
variable series resistor, not as a volume control. If its wired as 
volume control at low settings it would load the receiver audio too. The 
series resistor won't do that, in fact there's already a 220K series 
resistor in the transmitter sidetone audio line to lower the level.  The 
variable series resistor should be the most usable while a temporary pot 
could be replaced with a fixed value series resistor.

Incidentally an Altoids tin box is a workable shielded box for such an 
application.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 9/16/2015 6:35 PM, David Place wrote:
> I am having a problem with the amplitude of the side tone generated by my
> Collins 32S-1.  It is too loud and I have to use the AF control on the
> receiver to turn it down then turn the receiver up when I have stopped
> sending.  This seems to be counterintuitive on a piece of equipment that is
> supposed to be the Cadillac of rigs.  On the 32S-3, I see they put a
> screwdriver pot just to the right of the VFO on the chassis.  That makes
> sense.  What have others done with the older S Line.  I suspect I will just
> install a potentiometer but have I missed something from the way the rig is
> supposed to be set up.
>
>
>
> Dave Place
>
> VE4PN
>
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