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 > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto: > [email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to > [email protected] -- View this message in context: http://elecraft.365791.n2.nabble.com/Microphone-tp7623314p7623336.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
