Question about Cobra 148 GTL 120-Channels Base CB Radio

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No modulation in AAM only mode. Needing a schematic.

I have a Cobra 148 GTL New Model BLACK FRONT PANEL, with main board PCB marked "SSB 145106". Have not any schematic for solve a no modulatiun on AM mode. Circuit similar but no equal to 3900. Will thanks any help ! mcastelo@adinet.com.uy (CX9BT)

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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.

Posted on Jun 10, 2009

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1 Answer

Cobra 148 gtl b no recieve


make sure that the rf gain is turned up all the way.Check diodes D-12&D-13.

Jan 08, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

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

Mar 30, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

No AM carrier or modulation. SSB transmits good


what cb is it ? it sounds like your am section is not getting powered up when you switch from ssb to am. If i know the model i may have a diagram of it here and suggest a place to start

May 02, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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