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How can I tell hom many watts my cb radio is putting out

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If you really want to know the true power of your transmitter seek a professional with a calibrated meter such as a Bird like maybe the service man at the Motorola shop or maybe a Ham Radio operator they will be happy to help you.

Posted on Sep 12, 2010

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Hi, my name is John. you need a watt meter, you can purchase it at Radio Shack, or borrow one from a friend. You need a short three foot jumper. With the jumper end to your radio and the other end to meter, it will be marked on the meter. The other to your antenna. Put the meter on ten or twenty watt scale and key the mike. Your reading on the meter will be your watts or close to it.....hope this was very helpful.....Rate this solution on the four thumbs-up...John

Posted on Sep 08, 2010

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I have spotty reception on a handheld CB and was wondering if there is a testing procedure I can use to check the antenna and radio. I have a multimeter. It's a radio shack handheld with weather bands...


The antenna is your problem not much gain. Height is everything tx and rx. Although it would not compare to a conventional cb size negates performance. Seeing is believing in this case hearing get adapter to connect to standard coax of antenna. (PL259) to BNC Coax Adapter Radio Shack sells them. And dont ask or buy any radios there. They are hardly the radioshack of choice anymore.

  • If you put 4 watts into a four-foot antenna, you will get the same power out of that antenna as if you were putting 2 watts into a 102-inch whip.
  • If you put 4 watts into a 3-foot antenna you will get the same power out as if you were putting about 1.5 watts into a 102-inch whip.
  • If you put 4 watts into a 7.5 inch antenna on a hand held CB, it would put out as much power as a third of a watt into a 102-whip.
  • If you put 4 watts into a 102-inch whip antenna, it is the same output as if you put 11 watts into a 3-foot whip.
  • If you put 4 watts into a 102-inch whip antenna,, it is the same as if you put 14 watts into a 28-inch antenna.
  • If you put 4 watts into a 102-inch whip antenna, it is the same as if you put 54 watts into a 7.5 antenna.


May 21, 2011 | Cobra HH 38 WX 40-Channels Handheld CB...

1 Answer

Adjust the receive and turn the dead key down to 1.5 watts


Then put a 40 watt modulator in line with a 400 watt amp. You will have an out put of 800 watts to the antenna. Make sure you have an antenna thats rated for it. Francis whip is a good one, Palamar, another good one.

Feb 26, 2011 | Cobra 19 DX III 40-Channels Base CB Radio

1 Answer

I have a cobra 25 ltd classic that I bought from a CB shop it was fixed to have 50 W .you can see all the changes made on it .I have it hooked up with two wips 4 ft 1000 w fire sticks and a power mike it...


either he over tuned it and burned the radio out this can happen just cause a radio transmits 50 watts dosent mean the circuity can handle it and it will burn the radio because of overload. another factor is if you are running high swrs with that kinda out put you will fry it sounds like its getting hot and radios dont work well when they get hot take it to a tech tell him what was done to the radio and what it is doing. you can test the radio by buying a watt modulation meter it will tell you excacley what the radio is putting out I doubt its transmitting 50 watts that is a single final radio unless he modified the final.good luck.

Jan 15, 2011 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

DX-66V Base CB Radio: i would like to know what i can do with all the ch...


the 66 doesnt have sideband 45 watts is a hell of a lot of power how did you get 45 watts mine does about 20 watts and is loud as hell

May 18, 2010 | Galaxy Radios DX-66V Base CB Radio

1 Answer

I have a cobra 200 gtl dx and some one make modification on it to get more power and more modulation but i see in my books the modification to raise up on the board in front of my cb tell me to raise up...


you do not do it by resistance. To turn up the radio it is a variable resistor. What you do is connect a watt meter that can read PEAK or PEP watts AND AVERAGE or dead key watts.

First you check it on avg watts. Hook the radio up in line with the watt meter and set it on avg watts. key the radio. Stock is 4 watts. A lot of times when you peak a radio, you lower the dead key.(thats keying with no audio.) This allows you to get more modulation wattage, or swing wattage. If that has been done it will probably do 2 or 3 watts. If it has had the AM power raised in it, it could be more, this is no good. You want your dead key a bit lower.

Now check it on peak. Flip the meter to peak and make an AHHHHHHHHHHHHHHH noise into the radio. It should swing to anywhere between 15 and 20 watts.

You adjust the AMC while giving it audio and watching the meter on peak to adjust the modulation. 4 watts is legal modulation.

Feb 07, 2010 | Cobra 200 GTL DX 4-Channels Base CB Radio

2 Answers

Just want to know if i should use my ll203 amp in am or ssb mode when running with a cobra CB radio?


What radio?? Does it have single side band(SSB)? If not, then don't use SSB.

AM - amplitude modulation
SSB - single side band.

If you have SSB, there would be a switch on it to transmit in SSB. If not, it is AM only.

Second, Has this radio been worked on to be able to run on an amp? If not, you will blow the amp.

A CB radio transmits dead keys with 4 watts of power, and transmits with 4 watts of audio.

a 4 watt dead key is too much for a linear amp. You will smoke the transistors. Also, 4 watts of audio is not enough to drive it properly. You won't get full power.

The dead key needs to be around 2 to 2 -1/2 watts,or what ever makes the linear dead key half its peak wattage., and the modulation (audio) turned up all the way.

It doesn't sound like you know too much about CB radio's. Not a big deal, you can learn. For right now you may want to take it to a cb shop and tell them you want a peak and tune, and set up to run a linear.

You can find CB shops usually at truck stops. Some area's they are other places. Check the internet for local shops.

Oct 31, 2009 | Galaxy Radios DX-959 40-Channels Base CB...

2 Answers

Corbia marine cb radio 41 plus


If it is a CB radio it is limited to what all the other cb radios do. You can get them "tuned up" but its illegal and depending who does it can harm the radio.

Dec 21, 2008 | Cobra 18 Wx St Ii Mobile Cb Radio

2 Answers

Radio issues


Unless your using a Bird Wattmeter with proper frequency plugs your not seeing a true reading of power output. The radio manufacture presets the power output to a max. of 5 watts.

Feb 23, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Question about my cobra 200


no need to increase power output. you can take a radio with 100 watts and a radio with 10 watts that had had a modulation kit installed and the 10 watt radio will out talk the 100 watt radio ALL day long. the best thing to do would to put a mod kit in it and have the dead key cut back to 1/2 watt then put as little amp behind it. with those mods it will be loud and clear. hope that helps

Dec 30, 2007 | Cobra 200 GTL DX 4-Channels Base CB Radio

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