Question about Cobra 148 GTL 120-Channels Base CB Radio

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Output power hi i have a cobra 148 gtl dx out putting about 3 watts how do i turn power up regards geoff

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  • Don Reiman May 11, 2010

    First off, is the wattage PEP or AVG reading? If your meter is only reading AVG then we cannot see if it is swinging.

    Is this radio used? It could have a swing mod in it. The dead key may be 3 watts, but it might be swinging to near 20 if you are not using a meter that can read PEP watts.

    If its an older side mic 148, thats a good radio. the new ones are not so good. If you bought it used from some one, no doubt it has been peaked already.

    Look inside the radio. look for R131, if it is either missing or cut, it has already been peaked and cannot put out any more power with out a serious mod. That mod is not needed as the older 148 GTL is a screamer.


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There are 3 versions of this model. Here is how to turn up the power on all 3.

Early production model: Turn VR5 all the way to the left and turn VR11 all the way to the left.

Late production model: Remove VR14, turn VR13 all the way to the left.

if its brand new, its the easiest. Just turn VR6 all the way to the left.

Posted on May 03, 2009

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2 Answers

Cobra 148 gtlcobra 148 gtl DX


http://www.cbtricks.com/radios/cobra/148gtl_dx/index.htm

Nice choice of radio i have the Grant LX Uniden which is roughly the older version.
This site may be of interest also if you choose the channel mod make sure you have the right PLL. http://www.radioaficion.com/HamNews/mods/mods-cb/2428-uniden-grant-xl-mods-pll-agc-power-clarifier.html

Nov 16, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

How to increase the power out put of my 148 gtl-dx cobra to up to 5watts ?


clip diode D11..Turn coil ferrites near finals it will numbered like say: L10,L20,L14 or something etc. It should already factory go like 3 watts to 10 watts on a real out meter. The radio meter is a simulated but not accurate meter read. But crank ferrite coils until meter reaches 5 watts on radio meter..and lock it down there OK.

Apr 18, 2011 | Cobra 29 LTD CB Radio

2 Answers

I want to power my cobra 148 GTL in my home, want kind of inverter would I need to do this?, (watts)


you would probably want at least a 4watt continuous power supply or better. do not use as switching power supply.

Oct 23, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

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

2 Answers

Need more channels and power


for more power replace the 1969 with mrf455 be sure the pins are inverted big power gain about 50 watts

Feb 24, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

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