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Old 04-30-2012, 10:47 PM
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Default Icom IC-208H Custom Desk Mic

Hello everyone,

I own an Icom IC-208H mobile radio and used it as a base radio. For a while now, I've been wanting to install an actual desk mic at my desk and replace using the stock hand mic. I see that Heil manufactures a model known as the ICM which can be interfaced with the radio.

My question is, I have a Shure 503BG microphone that was used for radio communications a while ago on an old radio console. Is it possible to somehow interface this microphone with the IC-208H?

For example, if I were to obtain the Heil FS-3 (Footswitch) and then their appropriate mic cable adapter, could I just use the Shure mic? I am going to assume that this Heil equipment will only work with the Heil mics due to specifications, but I thought I'd ask.

If anyone knows of a way to interface this Shure mic with the radio, I'd greatly appreciate any input.

Thanks,
Driv3r912
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Old 05-01-2012, 12:32 AM
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The Shure mic will work, but it may not have the same gain as the ICM. The ICM is an electret and the Shure is a dynamic mic. Electrets usually have a source of power and perhaps a small amp. You might check to see if the 208 has a mic gain in the menu options.
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Old 05-01-2012, 9:24 AM
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A dynamic mic will work fine with the 208. You should check the impedance of the old Shure mic and be sure it's around 600 ohms. I think the 208 pinout diagram is in the manual.
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