20 Most Recent Cobra 148 GTL 120-Channels Base CB Radio - Page 2 Questions & Answers


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


This sounds like a problem with the MB3756 Regulator IC. It controls voltage regulation and TX/RX Switching. It is a common failure in these radios. Check voltages with schematic that can be found at
CB Tricks Home Page

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


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.

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


uhoh someone played around on the inside of the radio. you are going to need a tech

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


www.cbtricks.com has what you are looking for

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


did you put it on a frequency counter? they can be set back on freq. if you know how to set it. how old is it? I would send it back to where I got it and have them fix the problem.

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


you are not matching it correctly. get hold of a friend that knows how to match it and see if he will help you.

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


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.

Cobra 148 GTL... | Answered on Nov 02, 2014


I have a a uniden teddy r that won't recieve.

Cobra 148 GTL... | Answered on Nov 02, 2014


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 .

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


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

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


There is no "best smallest" Base antenna. You can get a workman saturn B base antenna, it is small and black, but they do not work so great.

the best bang for your buck is an antron 99 base antenna. Unfortunately it is 18 feet long when put together. But if you spray paint it a dark color, and put it up in a tree you will hardly notice it.

When it comes to base radio's, smaller is not better, and you cannot get a best.

Antron 99 is the smalles antenna that will fall into a near best category.

But the saturn B will still work if you absolutely need small. you can find a bunch on ebay cheap.

Cobra 148 GTL... | Answered on Oct 14, 2014


try adjusting the L36,L38 to the highest reading on the external meter and then adjust VR10 TO 4 watts. If this doesn't cure the problem, you have a weak final transistor. Good Luck

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


Main IC or final with driver

Cobra 148 GTL... | Answered on Sep 01, 2014


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.

Cobra 148 GTL... | Answered on Sep 01, 2014


did you buy some elses junk and now you are trying to fix it.its more than you can handle unless you have the equipment.

Cobra 148 GTL... | Answered on Sep 01, 2014


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

Cobra 148 GTL... | Answered on Sep 01, 2014

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