[AMRadio] Hot microphone

Harold Smith w4pqw at cox.net
Sun Aug 1 13:17:44 EDT 2010

Pin 2 is usually used for push-to-talk.  that means that  they apply 124VDC 
to the top of transmit relay,bottom of relay winding goes to mic connector 
pin 2 ,,when you press the mic transmit button,pin 2 goes to ground ,closing 
the relay and going into transmit mode..I think this is a normal 
----- Original Message ----- 
From: "Geoff Edmonson" <w5omr at att.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Sunday, August 01, 2010 11:36 AM
Subject: Re: [AMRadio] Hot microphone

>  On 08/01/2010 11:11 AM, Mark & Paula wrote:
>> Collins 32V1 I'm reading 124 VDC on mic connection pin 2  ? Any ideas 
>> would be helpful.
>> ______________________________________________________________
> AC plug properly polarized?
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