I have an electret mic on a wireless beltpack for a football referee. What would be the best way to eliminate the popping when he turns the mic on and off? I've tried a couple of various caps across the high side of the mic to grd and it made no noticeable difference. The mic only uses two cables to the transmitter, pin 1 signal in, pin 3 ground. Wired weird I know, but when I put the switch in series with the high side, pin 1, it does break the signal. I am carrying the ground through to the output side, to the transmitter, and only breaking the high side, not gnd.
I'm using a DPST switch. It also uses a mini XLR, TA3F.
Thanks for your help.

 

Since thesystem is wireless, it also includes he transmitter.
So my suggestion is do not switch the microphon on and off, but rather the transmitter. THAT will solve the problem.e

 

Even when you break only the signal line, the electret capsule is powered by a bias voltage (often 2–10 V through a resistor). When you suddenly connect or disconnect that bias line:

Capacitors in the mic preamp see a step change in voltage.
The sudden current causes a voltage spike on the signal line.
The preamp amplifies it — that’s your audible “pop”.

A simple series cap to ground usually won’t help, because the step is being applied right across the preamp input.

 

The comment in post #2 totally ignores my suggestion. ANY change in the microphone signal path will be amplified as much as the microphone audio signal. THAT is the reason that I suggest hat instead, switch the transmitter power off and on. Most wireless microphone receivers have a squelch scheme that mutes the audio output when it does not sense any signal.
AND, switching the power off and on does not require adding any connection wires to that sensitive low-level microphone signal circuit.