Question about Cobra Radio Communications

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I HAVE A COBRA 19XS RECEIVE WELL, WHEN KEYING MIC IT SHOWS 3.5 WATTS WHEN TRANSMITTING NO AUDIO, MIC IS GOOD, COULD IT BE THE KIA7217AP BAD OR A TRANSISTOR BAD.

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  • larry McCormick
    larry McCormick Dec 10, 2016

    NO AUDIO OUT OF PA EITHER, WHEN SWITCHED IN PA.

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It is possible that the audio amp is bad but not necessarily. It could be a combination of the amp and the final but it could also be a resistor not allowing power to either. Check the resistor at the final and also the ones in the audio circuit .

Posted on Feb 02, 2017

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  • Cobra Master
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Hi and welcome to FixYa,

Which output is muffled, transmit (modulation audio) or receive audio?

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Please postback updates.

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Dead key, and modulation are different. You may have a meter that only reads dead key, and won't see the modulation. This radio is probably swinging close to 15-20 watts. you need a meter that can read PEP, Peak envelope power. Cheap meters only read AVG, or average power, witch will only show your dead key.

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1 Answer

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Hello Darren, Yes it sounds like the mic is wired bass ackwards,,! A cobra 25 mic wiring is
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When your keying the mic, the RX wires are being connected to make the RX work,,,
*** Let me know how you get along with it. Either buy a new mic wired for your radio or you or someone comfortable with soldering needs to resolder the correct wires back on the mic plug,,,Like I said, let me know and have a great day,, Mechanic is back quiet!

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If the radio receives OK and the TX red LED will not lit up when keying the mic, then it is a mic or mic cord or mic connector problem (or pin configuration). Internally to the mic, there is a switch for keying the PTT. This should be check down to the coiled cord to the connector.

If all of the above checks OK, then you would need to check the TX/RX regulator/switching circuitry.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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I hope this helps

Shuttle83

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Hi rem_fishing ,

Would seem that your Audio IC is busted. No receive audio, no TX audio. This would be IC2, KIA7217AP

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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