Question about Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

148 gtl receive works fine transmit has no power

Radio has had no mods. all works well on receive. With another radio on the bench the failing radio can be heard but just has no power to the signal on am or ssb. tx light does go to red when the mike is keyed and the audio is there but there is just no power out

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  • phil Ny Jan 12, 2013

    I can hear myself on another radio so I think that a lot of the transmitter is working. There is just no RF power.

  • phil Ny Jan 12, 2013

    It is not an oudio outpur problem; it is a RF power out problem.

  • Mike Charette Mar 05, 2014

    you should do an alignment on the radio . You can get the manual on CBtricks.com

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2 Answers

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  • Expert
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If your receive is good and when you key the mic the meter goes to zero...im almost possitive your final is bad. Try it on side band usb/lsb if it transmitts good its the am final or driver.

Posted on Mar 08, 2015

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Final

Posted on Nov 04, 2013

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Posted on Jan 02, 2017

SOURCE: cobra 148 gtl

First take a jumper wire and connect it to the DC Ground of the input of the radio then touch it to the TX pin on the radio if it does keyes up then its in the mic or mic cord on the end of the mic plug or where it goes into the mic cable goes up inside the mic. If the radio don't key up at all then check the main voltage regulator chip one pin will have 8 volts transmit and another pin will have 8volts recieve. If you get no switching DC voltage on the regulator then its bad and needs replacing there is also a known bad capacitor in the radio thats only 10 volts change it to 25 volts at the same capacitance.

Posted on Jan 08, 2008

  • 27 Answers

SOURCE: cobra 148 gtl stays keyed up on tx on both am and ssb

Your problem is a faulty changeover relay on the circuit board. It is a small black device , and may have the brand name MRATA
etched on it (the switchover contact points are stuck together)
WORTH A TRY GOOD LUCK
flyingfox@prople.net.au

Posted on Jun 22, 2008

  • 27 Answers

SOURCE: Cobra 148 gtl Low / No receive audio

No audio out / low audio out....This is a constant problem with the COBRA 148 gtl....to get a good level of volume replace the
electro caps ...start around the two speaker wires and work back from there. I'm in the process of rebuilding a 148 gtl and have found caps that are leaky and dried out...after replacing nine the volume went up to a good level...now i need to fix the distortion
and background hash. Did you know that there are many posts
on FIXYA about this same problem I.E. great TX , great PA but poor , or no audio out. these sets have been made in sevetal countries...The sets made in Taiwan or China have poor quality
front panel pots (the carbon track is micro thin and simply wares through to the material the track is printed on) This has the same effect as removing a wire from a pot I.E. no audio. The good news is that 99% of parts in the radio are freely available and that includes the front panel controls. ONE WONDERS IF THE SET IS WORTH THE EFFORT !!!

CHEERS GUYS / GIRLS.

Posted on Jul 03, 2008

  • 19 Answers

SOURCE: Cobra 148 GTL ST. No AM transmit audio. Carrier is

Could be TR41 or TR42. I would try TR41 first.

Posted on Jun 29, 2011

  • 4 Answers

SOURCE: I have a Older 148GTL, when I key down the mike

bit late, but for anyone else searchng for similar issues, test AM regulator ******, 2SA1012 - replace with good PNP, like TIP42c

Posted on Oct 04, 2012

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2 Answers

148 gtl receive works fine transmit has no power


Have you checked the 2sc2166 or the 2sc1969? Those are the RF Driver and the RF Final output transistors.

Jan 07, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

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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.

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If the unit is still under warranty send it back and have it repaired. If no longer under warranty, then it's spare parts.

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The 29 has a built in SWR meter--check the match to make sure it is below 2 (lower the better).

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148 gtl receive issues


The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

Mar 14, 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

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