Radio has had no mods. all works well on receive. With another radio on the bench the failing radio can be heard but just has no power to the signal
Yes 5 pin side plugs and they were made in malaysia. Also they have the MB8710 PLL. Easily modified for extra channels with 2 toggles and a little wire. (PLL pinout).
Have you checked the 2sc2166 or the 2sc1969? Those are the RF Driver and the RF Final output transistors.
SOURCE: cobra 148 gtl
First take a jumper wire and connect it to the DC Ground of the input of the radio then touch it to the TX pin on the radio if it does keyes up then its in the mic or mic cord on the end of the mic plug or where it goes into the mic cable goes up inside the mic. If the radio don't key up at all then check the main voltage regulator chip one pin will have 8 volts transmit and another pin will have 8volts recieve. If you get no switching DC voltage on the regulator then its bad and needs replacing there is also a known bad capacitor in the radio thats only 10 volts change it to 25 volts at the same capacitance.
SOURCE: Cobrba 148 gtl TX
Thanks sharcnet i just going through the steps in my head trying to figure out what I would do if it was on my bench ..Between the two of us we'll figure it out!!!..... Dean
SOURCE: cobra 200 gtl dx clarifier clip
Egor, hi. I'm sure there is a mod probably only known by the repair centers. I have converted and tuned the 200, but in case you don't know, the radio is full of surface mount components. They look like specks of pepper to the naked eye, and so it takes a tech with years of soldering experience to do any modding without destroying what their working on. Those radios are not a friendly radio for experimenting. I looked thru my papers that Cobra tech support sent me for converting, tuning, and other misc. mods but that info was not included. It is a nice radio when set up properly, so don't mess it up by experimenting.(just my opinion) Hope this helps,,and good luck, Mechanic
SOURCE: Cobra 148 gtl Low / No receive audio
No audio out / low audio out....This is a constant problem with the COBRA 148 gtl....to get a good level of volume replace the
electro caps ...start around the two speaker wires and work back from there. I'm in the process of rebuilding a 148 gtl and have found caps that are leaky and dried out...after replacing nine the volume went up to a good level...now i need to fix the distortion
and background hash. Did you know that there are many posts
on FIXYA about this same problem I.E. great TX , great PA but poor , or no audio out. these sets have been made in sevetal countries...The sets made in Taiwan or China have poor quality
front panel pots (the carbon track is micro thin and simply wares through to the material the track is printed on) This has the same effect as removing a wire from a pot I.E. no audio. The good news is that 99% of parts in the radio are freely available and that includes the front panel controls. ONE WONDERS IF THE SET IS WORTH THE EFFORT !!!
CHEERS GUYS / GIRLS.
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