Question about Cobra 200 GTL DX 4-Channels Base CB Radio

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Sounds like you are on a different frequncey and keys one half watt

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Walk it over here and I'll fix it for you. turn the watts to 1.5 watts and check the frequency .

Posted on Mar 01, 2015

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Is it possible to convert the cobra 29 wx nw st sound tracker cb to 10 meter amateur band?


No it cannot. If you want that buy a Ranger or a Galaxy.

The 29 can be altered to increase modulation and turned down in power to match it to amp for increased output of power.

Set to dead key a watt or so with a 100 watt amp it would dead key low and swing to 80 to 100 watts pep.(peak envelope power)

Mar 16, 2012 | Cobra CB Radios

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Need to know where to set low power set up for amp thanks


There is no specific dead key setting for an ampifier. Each amplifier requires different dead key to operate at it peak effeciency AND to sound the best it can. If I knew what type of amp it was I could give you a better idea. Just for a reference point I will give you these numbers. For your basic amplifier ( 2 pill - 4 pill non high-drive) you could safely set the carrier at 1 - 3 watts. This is why the majic number for most people is a 2 watt dead key. For a High-Drive amplifier you really have a broad range of settings for deadkey. Generally anywhere between 2 - 8 watts. Some can even handle 10 watts. This DOES NOT mean that they need a HIGH dead key to operate properly. Just FYI, what you run into with improper dead key is either a really choppy, splattery, overmodulated sound with a deadkey that is to low, OR, a really pinched up, tight sound with a dead key that is to high. Also, a HIGH dead key can cause an amplifier to over heat, causing the transistors (pills) to fail prematurely.
To set your dead key "properly" you really should have a technician "match up" the radio with the amplifier. This means, he will hook up the radio and amp that you plan to use with one another in line and tune (set dead key) the radio to "match" the amp. This will give you the optimal audio and performance without overdriving the amp.
Hope this helped. Lost Jeep, Athens GA, 10-7 !!

Feb 17, 2011 | Connex 3300 240-Channels Base CB Radio

1 Answer

I my galxey 959dx is kicking out too much wattage acc. to watt metter and my palamor is not changeing things at all iv checked it with a different metter and same thing ... what do i do


Hi, my name is John. Welcome to FixYa. It should have a variable in the back or some put it on the side of them, just turn it ever which way you need to turn it. You should not put no more than 5 watt drive in it, in fear of burning the pills. Most people set them for 1 to 1 and a half watt and then swing the rest. Thanks for choosing FixYa...John

Nov 27, 2010 | CB Radios

1 Answer

Can a 19 ultra power be turned down to 1 watt? If so where?


Yes it can, but it requires the addition of some components. It isn't really a straight forward install. It needs some reworking. In my opinion, not worth the trouble.

Sounds like you want to run a linear amplifier. If you really want to run an amp, get a better radio to do it. There really is no other reason to lower the dead key that low. Also, 1 watt might be too low. May not drive the amp well.

If you just want to make the radio swing, 1 watt is way way too low. You will have barely any carrier and the radio will sound like ****. That radio stock dead keys 2.5 watts. That's perfect for swing. Now you just need to have more modulation. Find DM1 and unsolder 1 leg and pull it out of the board. Now you will have full modulation. You will deadkey 2.5 and swing to about 15 watts.

If you want to run an amp, get a good radio. If you like cobra, get a cobra 29. They are fairly cheap, and sound amazing. As well it is real easy to lower the dead key in that radio.

Nov 12, 2010 | Cobra 19 Ultra II CB Radio

1 Answer

Cobra 29 classic "swing kit" ?


A swing kit is nothing more then a Cap and a resistor. There really isn't a different way to do a swing kit, unless you do variable power, which you don't need unless you are going to run a linear, and even then you can just set the dead key with a swing kit.

you need a watt meter, preferably one that reads peak and average watts. If not, average will be find.

Open the bottom cover of the radio. Hook the radio up to the watt meter, use a dummy load or have it hooked to the antenna. Never key the radio with an antenna or a dummy load.

Find VR4. Its toward the back right of the radio. Turn it all the way to the left. That increases your modulation.

Next find L14. it is at the back in front of the final resistor. While making a steady sound into the radio, just make an ahhhhhhh noise. Back the slug out of the tank until the needle hits peak. Don't move it out any more or you will over bias the final.

Now you will need a 220 uf electrolytic cap, and a 100 ohm 1/2 watt resistor, both of which you can get from radio shack. (this is your swing kit.

To the right of the tank slug is a jumper maked JP36. Us soldering wick to remove the solder and pull out the jumper. Now put the cap in it with the stripe facing the back of the radio.(that is very important. the other way you will blow the radio.) Solder it in place and cut the extra leads off. Now on the back of the board were you soldered in the cap, solder the 100 ohm resistor in between the 2 points.

The amount of resistance determines you dead key. you will be at about a 2 watt dead key which is good for swing and if you want to run a linear. The higher the resistor the lower the dead key, and the lower the cap, the higher the dead key.

That is your basic peak and tune with a swing kit.


Dec 23, 2009 | Cobra 29 LTD 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...

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

148gtl, Taiwan when you modulate the meter swings backwards


In the back is where power mods have been added...It sounds like a swing kit 1/2 watt deadkey to 25 watts which is a powerful modulation exceeding 100%. Its a 220uf capacitor in place of a jumper J1 or J(x) J something in some radios. if you replace the jumper and remove the capacitor 220uf or 470uf one.(near finals it will return to around 4 watt dead key) The result of 4 watts is modulation is flat;where if you adjust it to 2 1/4 watt to say 20 watts it will be very loud and modulation is at 100%.

Dec 07, 2008 | Cobra 148 GTL 120-Channels Base 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

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