Cobra 146GTL Part needed Final Bias

[rjjdog]

Cobra 146GTL it not transmitting. I've replaced with new mic and still not transmitting. RX works just fine.
I'm hearing it could be RF Final Bias is blown. Where can I find RF Final part? I've attached a picture.

Thank you
rjjdog

 

[laidback]

cobra 146 gtl,no tx audio - The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

 

[prcguy]

Cobra 146GTL it not transmitting. I've replaced with new mic and still not transmitting. RX works just fine.
I'm hearing it could be RF Final Bias is blown. Where can I find RF Final part? I've attached a picture.

Thank you
rjjdog

I doubt the adjustment pot for the bias on the final PA transistor has "blown". More likely the final PA transistor but the radio would need some testing to determine the actual failure. Do you have a volt meter? How bout an oscilloscope? You can take some readings with either one to get a better idea of what's wrong.

 

[rjjdog]

I doubt the adjustment pot for the bias on the final PA transistor has "blown". More likely the final PA transistor but the radio would need some testing to determine the actual failure. Do you have a volt meter? How bout an oscilloscope? You can take some readings with either one to get a better idea of what's wrong.

Thanks for responding. I'm not new to CBs but I am new to going and troubleshooting possible issues on the board. I don't have either test equipment. I should probably invest.

 

[rjjdog]

I went ahead and purchased a meter from Amazon. This will be fun.

https://www.amazon.com/dp/B095CDBH8T?psc=1&smid=A2JDD3IFLZ9FH0&ref_=chk_typ_imgToDp