Question about Cobra 148 GTL 120-Channels Base CB Radio

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How do I increase power output for a cobra 148 gtl the latest Chinese version

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Best way is to leave the radio in piece and obtain a linear amplifier to do the job a 10 meter ham radio amplifier will do nicely but you must re-tune it for the 27 mhz band 10 meter band is 28 mhz.
RF amps work best using side-band mode.

Posted on Oct 15, 2013

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on May 03, 2009

  • 40 Answers

SOURCE: Need more channels and power

how much power are you looking for the mrf 455 final will not yield you 50 watts impossible with out rebuilding the whole power strip. the final that i would use is the workman cb-20 it is a 20 watt final ther is alot to this to get what you need. better getting a amp.

Posted on Mar 08, 2009

  • 9 Answers

SOURCE: cobra 148 gtl channel mods

contact me i can mod your radio for 65.00

Posted on Dec 06, 2008

audio20
  • 22 Answers

SOURCE: cobra 148 gtl dx manual

This is the Manual for the C148GTL

Posted on Apr 23, 2009

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1 Answer

Cobra 148 gtl-st wont transmit but receives great


Check first your microphone

• check if TX is engaging when PTT is pushed.


• check for continuity ( mic and cable )



If you have not done these steps,

try it first, or borrow other compatible mic for Cobra 148GTL

from your friends on air.

Jul 28, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

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

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

No modulation in AAM only mode. Needing a schematic.


if the transmitter produces power output with modulation on SSB but NOT ON AM then the AM Pass Regulator is defective, more times than not.

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

1 Answer

Puts out very little


output transistor gone or power turned down on front control,

May 09, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Output power


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.

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

1 Answer

Cobra gtl 148 seems to have no power til i push on mic connecter.


cobra 148 shows no wattage output on external meter but does show good modulation.

Dec 08, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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