Hi Jim,

Gee Jim, I don't quite understand what your point is. You and I have always
been agreeing that the use of professional audio microphones and other
equipment for communications is not only a huge waste of money but also a
big inconvenience; 3-pin XL is not a convenient connector for ham radio use.
Who cares what PA and sound enforcement equipment equipment is using for a
microphone connector.

AB2TC - Knut


Jim Brown-10 wrote
> On Thu,10/13/2016 3:29 PM, Joe Subich, W4TV wrote:
>> Only broadcast and recording gear use balanced inputs with or without
>> high voltage phantom power for condenser mics.  Even general purpose
>> public address systems tend to use unbalanced mic connections.
> 
> WRONG -- virtually all modern PA and sound reinforcement systems have 
> used 3-pin XL connectors for more than 50 years. The exceptions are VERY 
> CHEAP junk sold by places like Radio Shack, and those built into 
> security systems. Most musical instrument amps have only unbalanced 
> inputs. Back in the '70s, I was maintaining lots of paging systems 
> professionally installed paging systems that used balanced mics and 
> balanced wiring exclusively, and many of them had been in service for 20 
> years. I don't remember ever working on a PA system that used unbalanced 
> mics except as lavalier mics connected to a wireless mic transmitter.
> 
> Communications mics made by companies like Shure, EV, and Turner 
> were/are made with output transformers that matched them to balanced 
> low-Z inputs for use in professional systems and unbalanced hi-Z for use 
> with ham radio, and PTT switches that can either be wired to key a 
> transmitter or short/open the audio path. The Shure 444 is a great 
> example -- the response is carefully tailored to roll off the low end 
> and add a strong peak around 3 kHz to compensate the rolloff of the TX 
> SSB filter. This response also works well for paging.
> 
> 73, Jim K9YC
> 
> 
> 
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