Pop in audio after key up

dsan65
Posts: 3
Joined: Wed Feb 23, 2022 12:05 pm

Pop in audio after key up

Postby dsan65 » Tue Feb 07, 2023 4:50 pm

I have been using VAC1 for mic connection,(using a XLR to USB interface on my computer) works perfectly, just thought I would try and plug a mic into the front of the radio, I use the rear RCA key port to key the radio with a Heil trigger. When I key the radio there is a slight delay then a pop in the transmitted audio. any ideas?
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w-u-2-o
Posts: 5540
Joined: Fri Mar 10, 2017 1:47 pm

Re: Pop in audio after key up

Postby w-u-2-o » Tue Feb 07, 2023 6:22 pm

What sort of mic, how is the mic connector wired, and what are your settings in Thetis for mic, bias and PTT?
dsan6t5
Posts: 1
Joined: Sun May 10, 2020 2:39 am

Re: Pop in audio after key up

Postby dsan6t5 » Tue Feb 07, 2023 11:11 pm

The Mic is a EV RE-27 dynamic mic, PTT into the rear RCA jack, it works fine if I push the MOX button
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K1LSB
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Joined: Wed Feb 05, 2020 5:25 pm

Re: Pop in audio after key up

Postby K1LSB » Wed Feb 08, 2023 12:03 am

1) In the H/W Select tab the Hardware Bias Option should be Off for a dynamic mic.

2) In the Options-1 tab the All Mode Mic PTT is Enabled in my setup (not sure whether that matters).

Mark
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w-u-2-o
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Joined: Fri Mar 10, 2017 1:47 pm

Re: Pop in audio after key up

Postby w-u-2-o » Wed Feb 08, 2023 12:12 am

dsan6t5 wrote:The Mic is a EV RE-27 dynamic mic, PTT into the rear RCA jack, it works fine if I push the MOX button

Unfortunately you did not fully answer my questions.

How is the mic wired to the mic TRS connector? It is almost certainly wired wrong and is being shorted out when you use the hardware PTT switch. The PTT connection on the rear panel is electrically connected to the mic connector. With the settings you have the PTT signal is present on the ring terminal of the mic TRS connector. When you activate PTT the ring terminal will be shorted to ground.

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