Question about Cobra 29 LTD CB Radio

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Outputt vs 4 watt

I know I can get more power out of it. I need some technical shema and how to doo it.

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Take a look out on The Quack Shack

http://www.thequackshack.com/

Posted on Jan 09, 2009

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How do i make my midland 48+ put out 12 watts i saw somewhere its capable of 12 watts


This CB radio is for use in Europe and other locations and is limited to 4 watts on AM and 4 watts on FM. Some countries further restrict output power to just 1 watt. Check this site for additional info.

It is possible for this radio to be "peaked" to provide more then the published 4 watt maximum - but the most I've read is going from 4 watts to 6 or 7 watts at best. 12 watts is a substantial increase for electronics and I suspect you may have misread or someone mis-posted the value to be 12 watts. Have a look these results for modifications for this radio. Modifying the radio will likely make the radio non-compliant and if caught transmitting with more power than permitted or on frequencies for which you lack a license may get you a stiff fine, prison or both.

May 19, 2012 | CB Radios

2 Answers

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

1 Answer

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

DX 2547 Only transmitting at 1 watt and swinging backwards on the power on high side from 4 watts to 1 watt.


Check the SWR reading on your antenna. If you have the wrong adjustment here, it is like having the wrong antenna, or none at all. You will need a SWR Meter, and somebody who knows what he/she is doing to help you.

Mar 25, 2011 | Galaxy Radios DX-2547 40-Channels Base CB...

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...

3 Answers

Wat power does this radio push


Generally All CB Radios will only push 4 watts. This is only if you have a SWR of 1:1

Jul 11, 2009 | Magnum S9 Base CB Radio

2 Answers

Bearly 2 watts


What brand of watt metter are you using?
Most all of them can be adjusted inside.
I have seen a 4 watt radio key 9 watts on some
meters.I have a two-way shop for over 25 years
mostly VHF an UHF but I cut my teath on CB.
Maybe this will help

Jun 28, 2009 | Uniden Bearcat Pro PC68XL 40-Channels Base...

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

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

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