Tx Delay using Microphone

[JohnFT61]

I have a microphone hooked up to the front panel. Once I engage PTT, it takes about 2 seconds before the G2 is ready for Tx. Is there a way to decrease the delay?

When using MOX, it is very fast.



73
John
N2KBE

[w-u-2-o]

Your mic is wired wrong. See this topic:

viewtopic.php?f=12&t=4616

Deleting your duplicate post in pihpsdr.

[JohnFT61]

I am using the Elecraft Microphone MH3, which I am told is the only one that works somewhat with the G2.

The microphone is wired as follows:

Tip to Mic
Ring1 to PTT
Ring2 to Ground
Sleeve to Shield

It didn't work at first, because the Mic- wasn't being grounded. I placed a jumper (inside the microphone) connecting the shield (Mic-) to PTT. so when the PTT line gets grounded, the Mic becomes active. How is it wired incorrectly?

Being that I am connecting the microphone to the front panel, I have Tip=PTT, and Ring=Mic for it to work at all (reversed for front panel in Thetis and piHDSDR).



73
John
N2KBE

[w-u-2-o]

The G2 (and all ANANs) use a TRS connector for the mic/PTT. You cannot use a TRRS connector on the mic. You will need to rewire with a TRS or design an appropriate adapter cable.

You also can't use the mic- signal to run the PTT line, this is what is causing the extended fall time on PTT. You must use a real ground.

[JohnFT61]

OK, I just connected the shield (Mic-) to the Ring2 line,and so I guess the Mic is hot all the time. I wonder why it is designed that way? Is it isolated from the Tx path while in Rx? It works now with no delay, using the original TRRS connector on the Elecraft MH3 microphone.

I wasn't trying to use the Mic- signal to run the PTT line, just wanted it to be grounded at the same time (while PTT was grounded) to let the microphone work.


73
John
N2KBE

[Visair20W]

[quote="JohnFT61"]I am using the Elecraft Microphone MH3, which I am told is the only one that works somewhat with the G2.



Hello all,
I made myself an adapter to an Icom microphone jack.

I connected a normal Shure 444 dynamic to it. I already had this combination with my Anan 200D.

But the Sennheiser ME64 also works via the mini-XLR on the back. Excellent

[w-u-2-o]

Is it isolated from the Tx path while in Rx?

No. It's unnecessary.

[KI4P]

I'm using a Heil 781. Works great. Mic+ to tip, Mic- to sleve. For now.

[JohnFT61]

OK, I have got better results with the Elecraft MH3 hand held microphone with PTT. The Mic is always hot, because it is connected to Mic+ and ground. Would it be possible to have the Mic input disabled during the Tune function? There is no need for it to be enabled.

For those of you interested, I placed a jumper from the Mic- to ground (inside the MH3 microphone), and also placed a parallel 1k resistor/1nF capacitor in series with the Mic+ lead right at the back of the Mic Element. The Mic Bias has to be On. The frequency response of the microphone is much better. For some reason, the Mic+ input uses the Black wire, not the Red!


John
N2KBE

[w-u-2-o]

When using TUN, two-tone, or the built-in test signal generator, no mic or VAC audio is passed to the transmit channel. There is nothing to worry about. This is not a simple analog radio.

See also viewtopic.php?f=12&t=2612. It's an old post but it still applies to Thetis and the G2.