On Apr 21, 11:40�pm, "Dave" wrote:

Would an air-gap tuning capacitor intended for transmitting hook up any
differently from an air-gap tuning capacitor intended for receiving?

No.

*I
built a project following the schematic for a commercial product, but the
(intended for transmitting) capacitor doesn't like being hooked up with the
stator grounded.

What is the circuit, and why would you want to ground the stator
instead of the rotor?

*Can't figure out how to make it work the way the schematic
is drawn, so I ungrounded the stator and take the input for the amplifier
from there instead of the rotor.

I'm not sure what you mean.

Most variable capacitors, transmitting as well as receiving, are
designed so the rotor is connected to the frame of the capacitor.

If one side of the capacitor is to be grounded, it is almost always
the rotor, because that means the capacitor can be mounted directly to
the chassis and the rotor shaft doesn't need an insulated coupling.

If neither side of the capacitor is to be grounded, the rotor and
frame must be insulated from ground. That means the capacitor can't be
mounted directly to the chassis and the rotor shaft needs an insulated
coupling.

*And doing this, it works fine. *Anyone
have any input? *I'm all ears...

Need more info on the application and the circuit.

73 de Jim, N2EY