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Old 14-11-2007, 12:01   #1
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Join Date: Nov 2005
Location: Black Hills, SD
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New Microphone Pinouts - Help!

OK, so my pretty exhaustive search for a replacement hand mike for my Vigil RT-80 VHF turned up nothing. On to plan B....

I bought a new ICOM HM-100N hand mike that I figured I could make work. It's a basic condenser mike... or so I thought.

The OLD mike was 4 wires, and the electrical engineer who was the P.O. of the boat (seriously - he was an electrical engineer...) had done a drunken soldering job of the 2 wires that are apparently the only ones needed for this thing to work. 4 wires, red, black, yellow & shield of which only the yellow & shield were in use. I swear it worked - just the bakelite case is busted up from being dropped on the deck.

The picture tries to show that the yellow wire goes first to the PTT switch, then to the condenser, then out of the condenser via the white wire which is then soldered to the shield. Easy enough to figure out - a nice little loop controlled by the push to talk switch.

The NEW mike is an 8-wire setup
I see from the schematic that Pin 4 is the PTT switch, Pin 6 goes to the condenser, and Pin 7 is ground.

So, how do I wire this to create the same "loop" configuration of the old microphone? Since the ground is common to both the PTT switch and the condenser, I can't just take the PTT output and feed it into the condenser can I?

Any suggestions would be appreciated.
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Old 14-11-2007, 14:52   #2
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Location: Brisbane Australia
Boat: sold
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mic replacement

It may be a bit hard to do as you may be not replacing lke with like. From the picture what you have is a moving coil type of mic & what you have shown in the cct is a condenser type. This may lead to speech level / quality problems with the unit & you would need test equipment to set it up correctly. You might be able to transfer the mic to the new case & wire it the same as orginially & that would work. You might be able to repair the old mic case. Out here I found a product 'Q bond' which is a white or grey powder on which you add super glue & that fixes EVERYTHING. I got it from REPCO an auto parts supplier.It is possiable to wire a mic with only 2 wires in some cases. (email if nec)

Regards Bill
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Old 04-02-2008, 20:58   #3
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Location: Toronto, Can
Boat: Endeavour 52 1991 Priority
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mount a new radio in the cockpit, on the nav pod, where you will hear it and use it. independent power source, and its own antenna mounted off the mast will provide you with a back up if you loose the mast.
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