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No modulation There is audio present in unit but does not modulate the carrier.

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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.

Posted on Nov 04, 2008

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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.

Oct 28, 2015 | Radio Communications

1 Answer

What is Dead Key on a CB Radio?


Deadkey is slang it is CW or Carrier wave which is RF power produced before modulation/audio is mixed in which stimulates PEP wattage slang being SWING WATTS. A Watt Meter is used to measure it which is often a combination device Wattage/SWR/Modulation meter.

May 08, 2013 | Galaxy Radios DX-949 CB Mob ssb Swr...

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I have a Realistic TRC-457.It has very low power and modulation.It is a virgin radio other than someone has replaced the final and driver.I noticet that I cant set the modulation and swr levels on my dosy...


How many watts does it do? If it swings say: 1.5 watts up to 4 watts, someone has installed a swing kit which has a very small carrier. In AM, carrier is not important, its modulation and swing that makes it loud. If its low Audio modulation then it may be that final has went bad too.

May 31, 2011 | Radio Shack TRC-503 CB Radio

1 Answer

Hi there. there is no spark to ignite the gas in oven.


You will need to replace the spark module if you don't hear any clicking, or there is no spark present when trying to ignite the gas.

To test the Spark Module:
When properly operating, the spark module repeatedly produces a spark at the ignitor accompanied by a sharp snapping sound.
  1. Turn off gas and power supply to unit.
  2. Check wiring diagram to verify all terminals and wire connections are correct and tight with no cuts in the wiring.
  3. Prepare to measure voltage on spark module from terminal L to N.
  4. Turn power supply back on.
  5. Turn top burner to LITE position.
  6. If no voltage is present on the meter, this will indicate the electrical circuit is interrupted before the spark module
  7. If voltage is present, then check ignitor.
  8. If ignitors are ok; then replace spark module.
To access the Spark Module:
  1. Turn off electrical power and gas to the range.
  2. Disconnect gas and power from unit.
  3. Remove screws securing top surface burners.
  4. Remove surface burner and disconnect spark ignitor wire from surface burner.
  5. Raise and remove maintop from unit.
  6. Remove screws securing spark module bracket.
  7. Disconnect wire terminals from spark module.
  8. Replace and reassemble in reverse order.

May 18, 2011 | Amana Ovens

1 Answer

No modulation with strong carrier


sounds like your Audio Output went out......not audio chip....may be your voltage regulator also....your voltage regulator IC is heat sunk....do you have a schematic?

Jan 23, 2010 | Cobra Radio Communications

1 Answer

Carrier Performance Edge Programmable Thermostat


Are you a qualified refridgerator mechanic with an eletrical liscence? If not get someone who is because doing it yourself will not only void the warranty of the unit but will also void your house and contense insurance in the event of a fire.

Feb 13, 2008 | Heating & Cooling

2 Answers

142 GTL Good AM Carrier Weak Modulation????


you may have to scope the finals circuit on the modulation to see if all the "inline" caps are installed correctly... be sure your pc board is grounded in all areas as required by specs in your manual. Make sure there is no bleedover and you are sheilding your crystals from the modulation platform. al

Mar 24, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

5 Answers

Cobra 148gtl


i am having this trouble as well. The ics was my thought too, but I think it is in the modulation circuit somewhere. another article i read said to check this. "Look for the collector of TR-23, you should read about 4.5 V with a dead key. If you find that this voltage is not present, check on the opposite side of R-120 for 6.5V. Most likely this voltage will not be present; if this is the case, C18 has shorted and needs to be replaced. This is a 330uf, 10V electrolytic capacitor beside L31. To prevent "future" problems, replace with a 16V unit." As of yet, i havent gotten that far. note this is from the cobra 2000, but they are very much alike. you might cross check the resistor capacitor numbers though. btw, isnt the mb3756 the pll ic?

Jan 28, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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