20 Most Recent Cobra 148 GTL 120-Channels Base CB Radio Questions & Answers


It is very likely that the reverse polarity diode inside the radio is shorted, usually because the radio was connected up incorrectly.

Cobra 148 GTL... | Answered on Apr 21, 2019


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Cobra 148 GTL... | Answered on Feb 04, 2018


I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.

Cobra 148 GTL... | Answered on May 09, 2016


The radio needs to be tuned for the box. 3 watts sounds too high for a 2x8.

I would say it would be more like 1-1/5 to 2 watts. That may be why your not getting that much swing.

You should set the radio so the box dead keys around 300 to 400 watts.

Cobra 148 GTL... | Answered on Jul 06, 2015


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

Cobra 148 GTL... | Answered on Mar 08, 2015


bad ground .

Cobra 148 GTL... | Answered on Mar 05, 2015


you cannot do it . take it to a tech .

Cobra 148 GTL... | Answered on Feb 23, 2015


change the reverse polarity diode.

Cobra 148 GTL... | Answered on Feb 16, 2015


bad ground inside radio or cold solder . Be careful of rf burns.

Cobra 148 GTL... | Answered on Feb 16, 2015


five pin /4 pin? (white D-104?)
five pin= 1-audio,2-shield,3-RX,4-comm,5-TX
4 pin=1-shield-comm,2-audio,3-TX,4-RX

Cobra 148 GTL... | Answered on Feb 14, 2015


I'll bet that the A.W.I. is out of adjustment. give it a little twitch of a turn and see if the red light goes out.

Cobra 148 GTL... | Answered on Dec 22, 2014


Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

if it dont transmit period on AM, then there's an internal glitch :)

Cobra 148 GTL... | Answered on Dec 08, 2014


explain more , and why?

Cobra 148 GTL... | Answered on Nov 28, 2014


Check to make sure the ext speaker jack is not worn out. Even the internal speaker will not work if it is worn.

Cobra 148 GTL... | Answered on Nov 26, 2014

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