Modding two Mobile Radios

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CDN_Sparks

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I am curious to know if it would be electronically possible to have the microphone from my 8900R be used as the mic for the 8900 and also a CB radio and also into a PA amplifer using an audio selector? I did a brief look at the connector and electical diagams and it looks like they all use the same wires. I am wanting to get it setup so I have one mic in my truck and select as to weather the mic is used on the HAM radio, the CB radio or into my PA system?
 

mmckenna

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A couple of issues you'd need to address:

Microphone type: Condenser or Dynamic? Dynamic microphones are easy, two wires and your done. Condenser microphones need a voltage applied to them to function.

Microphone impedance: This will need to match the radio. Incorrect mic. impedance will affect audio levels.

There are devices available that will do this, but they tend to be expensive: ::: New Communications Solutions :::
 

CDN_Sparks

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Thanks for the link, I called the company and they are willing to work with me to make a custom box that will do everything I want and more, your right they are not cheap but R&Ding a custom box on my own could easily outrun the cost of that unit and not have a warrenty to boot. Ill keep everyone posted on how the solution works out.
 

kb2vxa

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Usually ham rigs use electret AKA condenser mics while CBs and PAs use dynamics which are not interchangeable. You can probably get away with switching a dynamic between the CB and PA but not the ham rig or you'll damage the bias supply which often feeds other circuits as well resulting in an expensive repair. Conversely, you can't use an electret without a bias supply so it won't work on the CB or the PA.

No big deal using two mics, just make sure you pick up the right one... breaker breaker good buddy just might cause a panic on a repeater. (;->)
 
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