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Wiring handheld scanner into intercom

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geoffwinter

Joined: 25 Nov 2012
Posts: 1

Posted: Tue Nov 27, 2012 9:04 pm Post subject: Wiring handheld scanner into intercom

Hi, the airfield I fly out of has a UHF-only ATIS which I currently monitor via a handheld scanner with a 3-conductor 1/8" 8 Ω output (Icom IC-R5).  I use bud-style earphones and simply put one of the ear pieces into my ear underneath my headset when I need to hear the scanner.  Not exactly the most convenient solution, so what I'd like to do is wire in the output from the scanner directly into the output from my KY97A comm radio so that both are permanently going into my headset.  That way, all I need to do is turn on the scanner to hear it, then turn it off when finished.  I'm guessing I need to match the impedances to make this work - I understand the standard David Clarke headset is usually 100 ohm?  Could anyone please advise what (electrically) I need to do to make this work?  Apologies for being a complete avionics/electrical numpty!

Regards

Geoff, NSW AUS

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longg(at)pjm.com
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Posted: Wed Nov 28, 2012 6:46 am Post subject: Wiring handheld scanner into intercom

Geoff,



I claim no knowledge of audio connections but I would like to add to that a related issue with my Icom. I have a transceiver model (forgot which 1), which accepts and adapter plug for my headphones. If needed I can plug into the adapter and listen to whatever. The problem I have is that whenever I have the Icom on and engine is running, the noise level sets off the auto-mic and places into transceiver mode. Regardless of how I set the sensitivity, it just doesn't cooperate. In manual mode the mic picks up lots of background and makes my transmission unrecognizable (when flying). I think the designers build these things primarily with ground crew in mind.



I too would like to add some sort of adapter to my AUX option on the panel such that I could plug directly in and bypass the handheld mic. I've not asked my cable guys (http://www.approachfaststack.com/), but I'm sure they have a solution (or will make 1). You'll need to give up a $100 bucks or so for a result, but it will work.

Glenn



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