the other guys have you handled on the talkback thing.
on that little cap on the bottom of the board, can you tell us which two components are being connected by it?
the solder to the case of the radio is just for the bypass caps that connect PC board ground to chassis ground.
CB radios used to all be made with what is called a floating ground, so that you could put them in positive ground vehicles.
that's why the chassis ground is not just wired right to the PC board ground, but is done through capacitors.
EDIT: NZ8N's method will work also.
as for lowering your deadkey, don't de-tune the can, as that just creates an impedance mismatch in the final section of your radio, and will lower swing as well as deadkey.
the way to do it is to add diodes in series with D10, the anti spiking diode located near VR3. i believe it's a 1N4003.
each diode you add in series will drop the voltage going to the collector of the driver and final by .6 volts, and therefore, will lower the deadkey.
keep adding them till you get to the deadkey you want.
the great thing about doing it this way is that all the audio will still be passed 1:1 by the diode since it's already biased ON when you key up.
try it, you'll like it.
LC
