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

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.

check the am voltage regulator. you should have 12vlts on pin 1 ,4volts on pin 2 ,13 vlts on pin 3 . go to ( CB tricks .com ) its the same board layout as galaxy 44 . http://www.cbtricks.com/radios/superstar/3900/graphics/ss3900_sch.gif if you are looking at the board on solder side ,knobs faceing you ,it is located on top left hand corner ,about 1 inch down you will see the slot cut into the board .if you have vlt on pin2 less than 4vlts or higher than 8vlts its bad. Galaxy DX Radios DX44V Service Manual its (tr) 51 Galaxy DX Radios DX44V Service Manual

google it

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.

no.. just use it.

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

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.

try some canned air on the final to cool it down .If the radio comes on then you have the problem child.

http://www.cbtricks.com/radios/cobra/148gtl/graphics/cobra_148gtl_sch_b_size.pdf There is is another one just stay at cb tricks .com and you'll see the other one .

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

look it up

could be a blown tx diode in am.you would be better off taking it to a tech and let him fix it then to mess with it and have something else go wrong.

Hook up a speaker to the PA jack on the back of the radio. Put the CB into PA mode and see if any audio is coming out of PA jack. This will tell you if the AUDIO AMP IC TA7222 is good.

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.

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 technical support here: Support Cobra Electronics Corporation

why waste your money on an echo board .you should buy an echo chamber . They operate on the outside of the radio so people that don't know how to wire one in can still have one.the echo board should have come with schematics,if it didn't you may have to google it to get the schematic you need.

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

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.

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.