Telstar Electronics ha scritto:

On Apr 5, 12:57 pm, Giulia wrote:

Hi ,
i have a problem with a president jackson cb ,
in tx there is about 100hz noise (i tx with car battery no PSU),
the noise there is even if carrier is unmodulted (fm and am mode)....
Can someone halp me ?
Schemtics are aviable and i can use an oscilloscope.........

Giulia


Sounds like audio oscillation. What mic are you using? What happens if
you key the transmitter with no mic? Problem still there?
i put an612 pin to ground ......so mic is cutted out .....or carrier
oscillator or power control loop from tx power transistors.......

Giulia