Question about Motorola T5710 (22 Channels) 2-Way Radio

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Moto T5710 Disassembly - Transmits Carrier Only. No Modulation.

I'm trying to disassemble my Moto T5710 2-way radio to see if I can repair the Carrier Only/No Modulation problem. Besides the two screws in the bottom part of the battery compartment, where and what other screws/steps do I have to take to open the unit. It appears to be firmly attached at the top and will not come apart.

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  • bwilliam May 22, 2008

    Never mind.

    I found I had to pry off the front cover and there I found the other two screws.

    Unfortunately, now that I've opened the unit and done a basic inspection it appears to be completely dead. Batteries check good but now I don't get anything out of the unit. No display, no nothing. This may be a lost cause unless someone has some special "magical" suggestion to offer.

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Hello bwilliam. Batteries can give you a false reading. Check your batteries under load. Good luck.

Posted on Oct 03, 2008

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1 Answer

Transmits and receives no modulation out


I am not an expert but I think there can be little or no modulation of the carrier wave unless there is an audio input to the modulator. Like any audio amplifier a transmitter modulator (amplitude modulation) is quiescent without an input.

If the modulation amplifier and audio pre-amp are working and modulating the carrier wave and the antenna is ok then audio modulated radio frequency must be being transmitted.

It would be an extremely good quality CB that had a modulation meter. Mostly all they have is a meter giving an indication of the rf power being sent to the antenna and that rf (radio frequency) power would be the same whether modulated or unmodulated.
The modulation envelope, incidentally, is traditionally viewed or measured with an oscilloscope.

The indicated rf power could be verified using a field strength meter but the only practical way to discover if a standard CB is transmitting modulated rf is to listen to the transmission on a suitable receiver. If the squelch is turned down it will be obvious if the rf carrier wave is being received as the hiss would be silenced. If no audio is received it can be assumed none is being transmitted.

I suggest you try another microphone and lead and if that doesn't work it is clearly a job for a repair shop.

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Probably not.

The electronics in the transmit / recieve circuitry (RF = radio frequency) work very differntly from those in the display and control circuits, which prob ablyexplains why the display works, but not the rest.

The major problem with water in RF circuits is that even after it dries out, it leaves a residue, or worse still some corrosion, which adversly affects the tuning of the RF circuits.

It may be worth trying to dry it out a bit more - put it somewhere warm but not humid like near but not too close to a central heating boiler, for a few days. However, I suspect it is now beyond repair.

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1 Answer

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Hello Rob55spiral, Most common malfunction in no modulation is the microphone. Swap out with a known working mic. #1 If problem is corrected, aquire a DVM and repair the broken cable connection in your microphone. #2 If still no modulation you have an internal componet malfunction. Please inform me of results.

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