Hi folks! I have been investigating this static POP noise problem for a while now, including talking to the sound shop I bought the amp from and consulting with the manufacturer of the amp.
I am using an Astatic 611 dymamic PTT mic designed for paging/cb systems with an XLR male plug into the female XLR on the Traynor TVM10 amp (left side of diagram). There are only two wires from the mic and one ground connected to the XLR.
Always on the first keying of the mic, there is a very loud static-like POP from the amp. This POP noise reduces significantly with each successive keying of the mic, until the POP sound is at a more normal level - a slight click sound - that you would expect to hear when keying a PTT mic. If the mic sits idle for a few minutes, the dreaded loud POP returns and fades out as mentioned above.
On the advice of the manufacturer, I have tried many different grounding combinations on the XLR male end on the PTT mic with no effect on the POP noise.
It really seems like there is a static build up that dissipates thru the PTT switch when it closes - but where is the static coming from and how to ground it out? A standard dynamic singing/speech mic with an ON/OFF switch does not make this static POP noise at all when plugged into the amp and turned ON.
The amp is portable and powered by an internal 12V/7.2A rechargeable battery. The charger is removed from the battery charging port before using the amp.