This is its circuit diagram
https://www.electro-tech-online.com/custompdfs/2012/07/TH7_X7A.pdf
Technical Description
https://www.electro-tech-online.com/custompdfs/2012/07/TH7_Technical_Description.pdf
The receiver circuit should have been distorted after I tested the radio with my DIY power amplifier. Once, the ANT was shorted to 12v. power from a battery. Not sure if the problem may also come from testing the radio with the PA many times with a high SWR.
This results in less sensitivity of signal receiving comparing to another same model of the radio. I tried adjusting the RV1, which is supposed to be a squelch but the problem still exists. I cannot receive weak signal while another same model one can. This radio is auto squelch, there is no SQ dial.
So, I'm thinking of changing the Q6, Q8, Q9 but I'm not sure if it would fix the problem.
Please tell me which components should I change to fix the receiver unit of this radio.
The Schematic Diagram is in the TH7_X7A.pdf file.
Thanks.
https://www.electro-tech-online.com/custompdfs/2012/07/TH7_X7A.pdf
Technical Description
https://www.electro-tech-online.com/custompdfs/2012/07/TH7_Technical_Description.pdf
The receiver circuit should have been distorted after I tested the radio with my DIY power amplifier. Once, the ANT was shorted to 12v. power from a battery. Not sure if the problem may also come from testing the radio with the PA many times with a high SWR.
This results in less sensitivity of signal receiving comparing to another same model of the radio. I tried adjusting the RV1, which is supposed to be a squelch but the problem still exists. I cannot receive weak signal while another same model one can. This radio is auto squelch, there is no SQ dial.
So, I'm thinking of changing the Q6, Q8, Q9 but I'm not sure if it would fix the problem.
Please tell me which components should I change to fix the receiver unit of this radio.
The Schematic Diagram is in the TH7_X7A.pdf file.
Thanks.