Question about Galaxy Radios DX-949 CB Mob ssb Swr Talkback Rog.bp Pa Mode

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What is Dead Key on a CB Radio?

What is dead key and what should it read on the modulation meter?

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  • 146 Answers

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.

Posted on May 10, 2013

  •  MainMat
    MainMat Sep 08, 2014

    Most of the time, an operator 'keys up' his mic without saying anything to produce no modulation and reads his Wattage output. That's what they call 'dead key'.

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Posted on Jan 02, 2017

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SOURCE: Lost channels in a galaxy 66v cb radio

as far as the transmit frequency changing while you have the mic keyed this is normal, the transmit frequency is a little different than the receive, as far as the lost channels go you need to check the galaxy website and check to see if thier is any fixes listed. if none is listed then you can send the tech's a e-mail and tell them your problem and they will advise you on what to do.

Posted on Aug 15, 2007

dsakrison1
  • 65 Answers

SOURCE: full power with zero modulation

you possibly have a faulty microphone, if the amp is keyed to transmit and there is not audio to modulate. Try another mic

Posted on Sep 21, 2009

  • 219 Answers

SOURCE: 10 kc drop at key up no transmit

have you changed the voltage regulaor, or check it first 2 outside legs should red your 13 volt middle around 9

Posted on Nov 21, 2009

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SOURCE: G959 mod meter will not work but modulation is 100% others rfine?

If its the meter on the radio don't worry about it they do go bad but it won't effect the radio. My shops in North Florida. And no I have no web site at this time.

Posted on May 01, 2010

  • 219 Answers

SOURCE: my galaxy 88hl has no dead key,but swings forward

It could be as simple as you need to turn up your dead key.

Posted on May 04, 2010

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2 Answers

Need to find 2 or 4 watt dead key and modulation I just purchased this radio and it doesn't have any dead key or modulation


You are basically saying that the radio wont transmit, Does it power on at all? Does it have any sound coming out of the speaker when it is on?

Jul 27, 2015 | Galaxy Radios DX 77HML Base CB Radio

1 Answer

My 25LTD CB has been tuned and peaked. I just replaced the meter and it spikes hard when keyed. How can I adjust it without degrading the tune?


It could be the variable resistor that sets the meter movement or it could be the person that tuuned and peaked it didn't know what they were doing and set a high dead key. The radio should key low and then swing high. You must first track down which one is the problem. You will need a good watt meter for that. If it isn't a problem with too high a dead key then go to CBtricks and look up your model of radio and find the "VR" variable resistor that sets the meter. Open up the radio and turn the resistor to match the meter scale with what the watt meter reads.

Sep 16, 2012 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

SSB dead key & TX frequency problems


Check C-144, c-149, c-153, c-154 using an ESR meter.

Dec 23, 2011 | Galaxy Radios DX-2547 40-Channels Base CB...

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

1 Answer

Can i wire direct to battery to get more power instead of the fuse panel.Plus i have a comet 200 hooked up and only getting 125 watts whats the prob


comet 200? its a 2 pill. 125 watts seems right. The amp should be run straight to the battery always. you can run the radio, but that will not get you more power although it will help with engine noise in your radio. You could be starving the amp if its not run to the battery, but you won't see much more wattage.

Also your dead key will effect your power output. Should have some where around a 2 watt dead key.

This leads me to my next point.

What kind of meter are you using? if its a cheapo pyramid or workman, it may only read average watts. and it will only show you your dead key. It will not show you audio swing. you need a meter that can read peak watts to see your true swing.

you may be doing more then you see on your meter.

Jan 05, 2010 | Cobra 25 LTD 40-Channels Base CB Radio

2 Answers

ONLY 2 WATTS DEAD KEY AFTER BEING PEEKED/TUNED AND MOD KIT.


it sound that a can has been set of balance, or the output  transister has crashed. did you up grade the output before ajusting for more output.

May 20, 2009 | Uniden Bearcat Pro PC68XL 40-Channels Base...

1 Answer

Tunring up a cobra 150 gtl/dx


Um... What?? This is hooked to a switch? CB radio by FCC regulations is only supposed to have a max of 4 watts total output. If you can flip it to 7 watts dead key, you are doing really good. It won't do much more then that. It sounds like its set up to run on a linear amplifier, which cannot have more then 3 watts dead key transmitting into it.

Dead key, and modulation are different. You may have a meter that only reads dead key, and won't see the modulation. This radio is probably swinging close to 15-20 watts. you need a meter that can read PEP, Peak envelope power. Cheap meters only read AVG, or average power, witch will only show your dead key.

7 watts dead key is really good for that radio.especially since stock only has 4 watts. you cannot get any higher then that without changing finals.

at 3 watt dead key, or 7 watt dead key, your modulation wattage is still swinging much higher.

Also, you will get more swing with a lower dead key any way, which is better if you want it to be loud.

Leave it alone. its probably set just right.

May 12, 2009 | Cobra 150 GTL DX Base CB Radio

1 Answer

Low output power


On the meter you are using, does it mesure Average power or peak envelope power?

This is very important to know when you are measuring.

AVG measures basically your dead key. It usually will very little if at all.

PEP measures your peak output, or swing. Modulation.

So even if you have a radio that has been peaked, on a meter that reads AVG, it will still read around 3 to 4 watts. And, if it has a swing kit in it, it will read even less. A swing kit lowers the dead key it increase modulation. Higher PEP.

For example. I peaked my cobra 29 and it does some where around 22 -25 watts PEP. I have variable power in it as well, but usually run the dead key at 2 watts because I have a linear. The Radio alone, when mesureing on PEP with key up at 2 watts, and then when you talk, swings to about 22 -25 watts.

If I flip the meter to AVG, it stays at 2 watts even with talking.

If you have one of those cheap pyramid meters, etc, they usually only read AVG.

Get a meter from radioshack. They have a fairly decent radio for the money. It reads both PEP and AVG and has SWR as well.

If the radio has been peaked and it has a swing mod, it will most likely be swinging to some where in the 20 watt range.

On a side note. According to FCC regulations, a CB radio is only allowed to transmit with 4 watts of final power. Most times the manufacturer will have it a hair under so that they are leagal.

Basically it is illegal to use a CB that puts out more then 4 Watts.

But its a free for all these days. There is no more funding to the FCC for monitoring CB radio, so they do not want anything to do with it. As long as you don't over do it, have over 50000 watts and terrorize a small community with RF, you can do what you want.

Now a days most cb radio's bought have already been peaked if you got it from a cb shop, or off a website that does it.

Apr 21, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Dosy meter


To read peak and dead key, use one length of coax between the radio and the input side of the input connector, and another length between the antenna connector and either a cb antenna or a dummy load. Then put the far right knob on either the 20, 200, or 2000 watt setting, which you will read on its corresponding scale on the meter. When you just push the ptt switch on your cb mic without talking, that will be your dead key. When you talk into the mic, most people repeat the some of the following "audio", "audio 1", "audio 1, 2, 3" etc. (kind of like a dj saying "testing") different ways, or you can put your mic up to the radios speaker and use the high pitch squeal for the same effect to read PEP or peak-envelope-power.

If you do not have a manual and would like one, here is one in pdf format that covers the PM1000 and PM2001 models:

http://www.dosy.com/pdf/pm1000.pdf

If you require more assistance, such as checking modulation or swr properly, feel free to reply here or to my email at:

rollincbmods@yahoo.com

Dean Pitts
Rollin CBs
Mount Vernon, TX

Mar 18, 2008 | Connex 3300 240-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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