[Collins] 32S-3 microphone

[Robert Jefferis]

Frank,


Boy, microphone choice is a tough one. Without an external pre-amp, yes, you will need a high impedance, A.K.A., "hi-Z" dynamic or crystal microphone. I suspect that a very high percentage of 32S-3 installations will be covered if I mention the following desktop mics: Collins SM-1, Collins SM-2, Astatic D-104, Shure 444, Electro-voice 664. There are many more.

Shure still makes new hi-Z mics. I use the Shure 522 with my 32S-3s. The Shure 450 Series II is nearly identical to the obsolete 444 in all respects.

Or, if you have modern low_Z mics on hand, you can purchase a lo-to-hi Z in-line transformer from one of the mic manufacturers or use one of the many available external preamplifier/equalizer gadgets to boost the level, tailor frequency response, and convert from the low-
Z balanced signal to the unbalanced circuit configuration required for the 32S-3. 

The 32S-3 audio circuits and IF filters were designed for SSB communications application, not "broadcast" or "hi-fi" sound. The flat response and wide frequency response of expensive studio grade mics will be wasted. Matching your voice characteristics to the mic and transmitter audio response can be a challenge. Good luck , and enjoy your 32S-3

73, Bob KF6BC 
On Dec 5, 2009, at 11:59 AM, frankshughes at aim.com wrote:

> Hi,
> I am a new Collins owner, just received my first transmitter, a 32S-3. 
> I need some advice as to a microphone for it.
> I have read that a high impedance unit is required, and that there is 
> a special PJ-068 plug needed. 
> So what manufacturer /model of microphone should I buy and adapt to my new rig?
> What do most folks do for PTT? Rig a momentary switch on the mic.? Foot pedal?
> Or is it easier to use a hand mic. w/ a built-in PTT?
> 
> Thanks,
> Frank
> KJ4OLL
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