Cobra 19 Ultra II CB Radio "stage" Questions

...the service manual for this unit and look at the voltage level at the speaker, and the last audio stage of the CB. What I believe is that the audio amplifier or the audio detector of the CB has ...

...noise but do not receive on any channel, you must check the RF from the antenna to the audio stage(not included). There must be more than just one RF stage in this radio. Let me know what you ...

is hard to say. You should do following steps: - Allre all supply voltages present on the different stages? (PLL, receiver HF, MF and LF stage, TX pre-driver and PA) - Is the audio amplifier working?

TWO TRANSISTOR IN THE RF OUTPUT STAGES ARE MISSING.....TYPE? CIRCUIT DIAGRAM? PRO 501 XL.THANK YOU Hola santipatag! I have found two schematic diagrams that are very close to your radio. one is a ...

...of it. CAn u please help me thank u Hello Gentlemen, It sounds like a problem with the audio output stage of the CB, to test this: 1) get a schematic of the CB 2) unplug and un-install the CB 3) put ...

...usual controls with contact cleaner and look for faulty solder joints in the recieving section IF stages, primarily the AGC buss and, the detector diodes- also check them for excess leakage.  ...

lugnut, the lack of receiver sensitivity may denote a problem with the RF input amplifier or the IF stages. before attempting to boost the incoming signal I would first want you to check the RF and IF

cobra lxle no transmit after using bad antenna Likely damage to final or driver output stage of radio.

I have a RCI 2980 that the receive is very poor on.What might be causing the problem or where might i look on the board to fix the problem? is it in the RX stage or the audio output (audio op amp)

6 stage selector has been removed, is a wiring diagram available please please tells us the make and model