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Over modulation in mic gain when Xmiting on Ic-M700 pro SSB radio

When transmitting the modulation is distorted when the mic is close to mouth but is understandable when held about 12 inches from the mouth.This is reportd by another boater about 15 miles away at frequency 2.802 mz and 4.146 mz.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: No AM carrier or modulation. SSB transmits good

Great now check TR42 AM POWER then check TR41 AM POWER REG. They are on right side twards rear of board with front of radio faceing you part side up. A good place to start!

Posted on Jul 07, 2007

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Shuttle83
  • 1139 Answers

SOURCE: president mckinly ssb/am model with mb8719 pll chip.

It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.

Posted on Sep 05, 2007

Communicomm
  • 90 Answers

SOURCE: Cobra 200gtl High Power Transmit problem??

Depending on the type of power supply, radio frequency (RF) energy from the transmitter may be 'fooling" it into thinking that you're overloading it. Check to see if there's any discernible dimming of the meter lamp when this problem occurs, if so, the supply is the culprit.

Otherwise, its probable that the final amplifier transistors are overheating, either they are 'leaky' or not properly attached to the heat sink.

Posted on Sep 26, 2008

  • 17 Answers

SOURCE: pro 640e

How are you testing the audio out?
Are you using another radio?
If so, are you REALLY sure the other radio is ok?
If the other radio is ok, how do you know the mic is ok? have you tested it with another radio?
If the mic is ok, id have a look at the mic socket to check that all the pins are still there. Then open the radio up and check the socket is still connected to the main board.

Let me know how you get on..
M3ODQ

Posted on Feb 02, 2009

  • 219 Answers

SOURCE: uniden grant ssb cb, receives but no transmit,

test your voltage regulator and make sure you don't have a bad crystal

Posted on Dec 16, 2009

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This is never a good sign. This is usually a sign of a bad final.

If the radio doesn't transmit in SSB or AM, then it either means, Both finals are bad, (which is rare) or there is another problem causing the problem.

If it transmits in SSB, but not AM, then the AM final is blown and needs to be replaced. Its a job for a tech.

If both SSB and Am are not working it needs troubleshooting by a tech.

If you feel ambitious, you can pull the bottem cover off being careful of the speaker wires and make sure the TX section is connected.

Inside the radio, there will be one wire with a plug that is hooked to a pin near the center of the radio. And an empty pin. The empty pin is the test pin, ignore it. Make sure the plug is on the pin all the way, and not loose. If its on good, then it needs further troubleshooting.

Other things you can check:
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Pro 640e


How are you testing the audio out?
Are you using another radio?
If so, are you REALLY sure the other radio is ok?
If the other radio is ok, how do you know the mic is ok? have you tested it with another radio?
If the mic is ok, id have a look at the mic socket to check that all the pins are still there. Then open the radio up and check the socket is still connected to the main board.

Let me know how you get on..
M3ODQ

Feb 02, 2009 | Radio Communications

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