[Collins] How to wirie a shure 450 to a Collins rig.

[Dr.Gerald N. Johnson]

Dr. Gerald N. Johnson, Electrical Engineer
----- Original Message -----
From: Cam and Juli Hedrick [mailto:walnutcreek at appstate.net]
Sent: 8/9/2005 7:32:05 PM
To: collins at mailman.qth.net
Subject: [Collins] How to wiring a shure 450 to a Collins rig.

> OK gang, this is a new one on me.  I now have one microphone for this KWM-2.
> Can you tell me about to do it?  It has 4 wires and 1 gnd wire.  The green
> and white wires show 30k ohm with the Hi Impedance switch and Low Impedance
> it 300 ohm.  The red and black wires are for the contact closure. 
> Well, will it work with that rig?
> Please let me know about it,
> Thanks,
> 73,
> Cam
> WA4JKW
> 
Yes it will work. It has balanced audio and a separate PTT circuit. You want to use the high impedance audio, gets more voltage, same power.
Connect white and black to the sleeve of the microphone plug. Connect black to the PTT (Tip I think) and green to the ring. Its done.

73, Jerry, K0CQ, technical advisor to the CRA.
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