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COBRA 142GTL
- Thread starter doctor
- Start date
what exactly do you mean by "transmitter section"?
there is only one main board in this radio.
what is the problem you are having?
the more specific you are in describing your problem, the better your chances of finding help.
LC
there is only one main board in this radio.
what is the problem you are having?
the more specific you are in describing your problem, the better your chances of finding help.
LC
COBRA 142
The radio just quit xmiting, although the receive still works.<.it belongs to a friend not my radio.>
I have a feeling it just needs the final replaced..but not sure what the finals are/rf transistors..any ideas and where to obtain..will solder in for him.
DOCTOR/795
The radio just quit xmiting, although the receive still works.<.it belongs to a friend not my radio.>
I have a feeling it just needs the final replaced..but not sure what the finals are/rf transistors..any ideas and where to obtain..will solder in for him.
DOCTOR/795
first you need to test the driver and the final.
unsolder the legs and lift them from the PC board before testing.
here is how to test them using the diode function of your digital multimeter:
Testing semiconductors with analog and digital multimeters
if either of the transistors fails any of the tests, then you should replace them.
if they pass all the tests, they are probably fine and your problem lies elsewhere.
the driver is a 2SC2166 or a 2SC1306 depending on the age of the radio.
the 2SC2166 should not be too hard to obtain.
the final is a 2SC1969 most likely and these are hard to find and expensive when you do find one.
i have heard of people using a cb20w transistor made by workman as a replacement final with good results, but i have not personally tried one.
dont forget to re-bias the driver and final after replacing either of them.
LC
unsolder the legs and lift them from the PC board before testing.
here is how to test them using the diode function of your digital multimeter:
Testing semiconductors with analog and digital multimeters
if either of the transistors fails any of the tests, then you should replace them.
if they pass all the tests, they are probably fine and your problem lies elsewhere.
the driver is a 2SC2166 or a 2SC1306 depending on the age of the radio.
the 2SC2166 should not be too hard to obtain.
the final is a 2SC1969 most likely and these are hard to find and expensive when you do find one.
i have heard of people using a cb20w transistor made by workman as a replacement final with good results, but i have not personally tried one.
dont forget to re-bias the driver and final after replacing either of them.
LC