Cobra 148 GTL 120-Channels Base CB Radio - Answered Questions & Fixed issues


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 | 390 views


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Cobra 148 GTL... | Answered on Feb 04, 2018 | 481 views


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Cobra 148 GTL... | Answered on Feb 02, 2018 | 174 views


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 | 225 views


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 | 226 views


bad ground .

Cobra 148 GTL... | Answered on Mar 05, 2015 | 235 views


you cannot do it . take it to a tech .

Cobra 148 GTL... | Answered on Feb 23, 2015 | 80 views


change the reverse polarity diode.

Cobra 148 GTL... | Answered on Feb 16, 2015 | 225 views


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

Cobra 148 GTL... | Answered on Feb 16, 2015 | 320 views


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 | 209 views


google it

Cobra 148 GTL... | Answered on Feb 02, 2015 | 125 views


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 | 277 views


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 | 226 views


explain more , and why?

Cobra 148 GTL... | Answered on Nov 28, 2014 | 476 views


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 | 228 views


Sounds like a problem with the VCO / PLL Circuit since nothing happens in RX or TX. Check to make sure you have the correct supply voltages to start with and also check to see if you have 10.240Mhz. Use the service manual and go through the PLL/VCO alignment section. If anything is missing then you at least know where to look.

Cobra 148 GTL... | Answered on Nov 25, 2014 | 344 views

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