The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

I forgot, I get strong microphony..
Edit:
I was looking the radio now, and have some more info.
Without mic, I have the feed back, putting smeter up. Even with zero mic gain, it´s very low, but it´s present.
With mic, If I put mic gain to zero, it stops the feedback, but I have a strong hum (like if ...

Radio Make and Model: Cobra 148GTL SN: 13011503
PCB Number: PC412
PLL Number: MB8719
Test gear available: RF Gen. Fluke 20MHz Dig Scope, 4 1/4 + 3 3/4 True RMS digimeter, RF probe, Freq Meter, Tektronics 10MH analog Scope, etc..
Symptoms:
Strong RX feedback when SSB selected (upper and Lower), S ...