[Icom] 756 Pro 2 Mike connector

Tue, 29 Oct 2002 17:34:47 +0200

  not ont that: the mike ground return usually is a dedicated ground path,
that runs floating up to a point close to the mike preamplifier in order to
avoid ground loops, with a VERY low current rating. The PTT ground on the
other hand is a higher current rating ground connected to whatever DC point
that seems convenient. NEVER interchange them: you usually end with RF
feedback of the worst kind!
		73 and all the best
				Alex	4Z5KS

-----Original Message-----
From: [email protected] [mailto:[email protected]] 
Sent: Tuesday, October 29, 2002 5:22 PM
To: [email protected]
Subject: Re: [Icom] 756 Pro 2 Mike connector

Icom DOES infact provide a diagram of the mic connector. It is marked VERY 
clearly in the manual that pin 1 is the mic input and pin 7 is the mic 
ground. Pin 6 is the ptt ground. VERY different from pin 7. Since audio 
requires a center and a shield,I suggest you us them. Pin 6, ptt ground, is 
to the case, common ground and audio must float above.

gl.es 73.

Larry... N2LH   .-  .-.
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Your Moderator: Dick Flanagan W6OLD, [email protected] Icom Users
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