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My cb radio has no modulation

I had a guy over the radio when I keyed it up and asked for a radio check he said I have no modulation only a carrier.

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  • Radio Commun... Master
  • 1,795 Answers

Sounds to me like you could have some bad coax,bad ground or bad antenna.

Posted on Jun 05, 2014

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Posted on Jan 02, 2017

Communicomm
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SOURCE: cobra ltd classic no modulation

Assuming that you've tried another mike, the problem may lie in the speech amplifier circuit within the radio, something that will require someone with technical knowledge to repair.

Posted on Sep 26, 2008

Communicomm
  • 90 Answers

SOURCE: no cb channels no audio no recive

If you have no channel display or CB operation, it sounds like a blown voltage regulator that supplies power to the CB PLL circuit.

Posted on Sep 26, 2008

  • 10 Answers

SOURCE: I don't have voice, have carrier. Cobra 29 ltd

there are several things that might be responsible for the absence of modulation when speaking into the microphone. a defective mic cartridge, a broken audio or audio shield/ground wire in the mic cable or mic plug or a defective push-to-talk switch in the mic itself, for starters. if all is well here then the amc and transmitter speech stages in the transceiver will have to be considered next. locate and check with a known good mic wired for the radio in question. let me know.

Posted on Jun 10, 2009

  • 12 Answers

SOURCE: 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?

Posted on Jan 25, 2010

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kb8dns
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SOURCE: radio puts out a carrier wit no modulation

The output stages were very poor on these radios and if it still has warranty I would contact Cobra for an upgrade or replacement....

Posted on Mar 07, 2010

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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.

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The best way to solve this problem is to find a power mike for the radio, it will bring the modulation up to 100% instead of the 25-30% that you are currently working with and your carrier wave will have a lot more punch. Ham radio shows are worth checking to find what is needed, or second hand store may be another option.

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Got a connex 3300HP has a ranger board and chipset won't modulate recieves fine keys up relay clicks needle doesn't move no voice either cant find schematics


You may have a dead meter.
Modulation is audio's affect on swing wattage or pep. Notice that needle moving more with your voice.
Dead key or carrier wattage is without your voice enhancing the power only with mic keyed.
I can only assume that the chipset you are referring to is an ic chip audio or pll which must be working if you are receiving audio.
Check your mic cord................ transmit and modulation and even your receive volume can be affected by the cord/mic plug solder joints or broken wires here.
http://www.cbtricks.com/radios/galaxy/dx33hp2/graphics/dx_33hp2_sch.pdf this is a similar radio the General Lee, Connex 3300hp and Galaxy hp2 share boards i believe dont hold me to that thou.


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1 Answer

Radio puts out a carrier wit no modulation


The output stages were very poor on these radios and if it still has warranty I would contact Cobra for an upgrade or replacement....

Mar 06, 2010 | Cobra 150 GTL DX Base CB Radio

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Hey guys i have a galaxy 44v, i had two radio checks, on guy said it sounded like i had a pin on my nose and one said i was a little distorted, so what is going on the radio, is dead keying 0.5 watt and...


That radio is clipped and producing as much audio it can and in the process it is also a big splatter box. If you produce 4 watt of carrier and swing 6-7 it will be kinder one everyone ears around you.In other words make sure tr 32 is intact, r49 is not clipped and the amc is not turned wide open.should be marked am mod.I am a Ham Radio Operator that has 15 years of motorola experience. Hope this helps.

kf4gyp
Ray
73

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This old Galaxy has good carrier but no modulation


check mic lead first if all right contact me on appleby.norman@yahoo.co.uk

Jun 17, 2009 | Galaxy Radios DX-33HML 40-Channels Base CB...

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Help me!!!


SWR OK? Is it throwing a dead-key carrier? No carrier? Midlands many times will show what looks like a processed modulation signal but is not going out your finals on the radio, and out the antenna. Suggest an external in-line meter to see if there really is a transmitted signal. If there is a signal, look for a broken/bad wire at the mics plug-in end. If no signal on the add-on meter, suspect an audio chip or final that's defective. All three are fixable at a GOOD CB Shop.

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Cb radios


sounds like your audio chip is gone. When you say it shows carrier signal is it just showing dead key or does it show modulation when you talk? 85% chance its audio chip without having it in front of me i couldn't tell for sure.

Apr 27, 2008 | Galaxy Radios DX-33HML 40-Channels Base CB...

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No AM carrier or modulation. SSB transmits good


what cb is it ? it sounds like your am section is not getting powered up when you switch from ssb to am. If i know the model i may have a diagram of it here and suggest a place to start

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