20 Most Recent Cobra 148 GTL 120-Channels Base CB Radio - Page 3 Questions & Answers


need to get a watt meter hooked up to then go the where the final is and look aroung for a tuning slug marked L38 and that is the baby you have to turn in order to power down this radio.

Cobra 148 GTL... | Answered on Aug 23, 2014


it could be the diodes that operate it that are burnt.

Cobra 148 GTL... | Answered on Aug 23, 2014


this rado has this problem and to fix it you should have the meter replaced.

Cobra 148 GTL... | Answered on Aug 23, 2014


turn squelch all the way to left.turn RF gain all the way to right.Turn mic gain all the way to right.Turn radio on low and then adjust volume.It should come on and transmit Could be a broken tx wire in mic.If it still doesn't come on take it to a tech.

Cobra 148 GTL... | Answered on Aug 23, 2014


put on a different mic and see if it still happens.I am going to attempt to draw an insert so if it works follow it if it doesn't I'll explain it.
this wire is the audio on the inside of mic
-------------------------------X-------(4700ohm 1/4 w res) ----X---------
.001 .001
this wire is the shield
-------------------------------X-------------------------------------X----------
at the point marked with X take two .001 capasitors and wire them from one wire to the other. this should make your squeal go away.

Cobra 148 GTL... | Answered on Aug 23, 2014


before you go thru all the trouble of wireing it ,what kind of radio did the desk mic come from.If it came from a galaxy then you shouldn't have to change a thing. 5 pin to 5 pin try it then if you have to wire it.

Cobra 148 GTL... | Answered on Aug 13, 2014


when you are not talking the light should be an aqua / green color.When you transmit it should turn red. if you see two red lights your antenna is out of match.As for your radio not get out you have to get a friend to listen on another radio and he will tell you if its working or not.

Cobra 148 GTL... | Answered on Jul 30, 2014


used radio ? If so some one tried to hook a toy into it to make it sound that way. Take the bottom cover off to look inside to see if there is any extra baggage.

Cobra 148 GTL... | Answered on Jun 05, 2014


a cold solder joint, or bad A.M. voltage regulator

Cobra 148 GTL... | Answered on May 30, 2014


you have somthing backwards but there is a cure.

Cobra 148 GTL... | Answered on May 18, 2014


Check xtal X1 (7.3450 MHZ). It's in the am osc. I had exactly the same problem. I live in a highly corrosive coastline area

Cobra 148 GTL... | Answered on May 17, 2014


check tr 51 (Q 51) the sb754 on the back side mounting of the radio.. the center pin (collector) of this modulator ic should not be 13 volts. my bet is that it is.. this test is done in am mode.. not sideband.
depending on you carrier setiing it should be between 3 -8 volts any higher in am mode and my bet is that its bad... much more common than the finals in this radio. good luck Rick

Cobra 148 GTL... | Answered on May 12, 2014


turn the SWR/CAL/S-RF switch and set it back to S-RF

Cobra 148 GTL... | Answered on Nov 26, 2013


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.

Cobra 148 GTL... | Answered on Oct 15, 2013


What problem are you having with Receive?

Cobra 148 GTL... | Answered on Sep 06, 2013


If you have the manual that came with the equipment it should show you a diagram of plug on the mic with colour code.

Cobra 148 GTL... | Answered on Aug 24, 2013

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