APX conventional TPT?

[billy2047]

Hi all,
i'm trying to program several APX8000s operating on encrypted conventional P25 mode.

I'm trying to get the radio to emit a TPT (tone doesn't have to be fancy and single short beep also works) while using encryption. (Users complaint no audible feedback when PTT button is pressed).

TX Cleart Alert tone doesn't work on encrypted conventional talkgroups so that is out of the equation.

Any suggestions would be appreciated

BB

 

[Tech21]

There is no official way to do it, unfortunately.

 

[Forts]

It boggles my mind that it's not an option on the APX. Drives me nuts when I go from my XPR-7550 to APX and lose the PTT tone.

 

[cpg178]

You could set MDC to be pre and do a PTT Sidetone

 

[Tank67]

You could set MDC to be pre and do a PTT Sidetone

He can’t do this because as OP mentioned they’re on conventional P25 with encryption.

 

[nhfdcadet]

allegedly, its coming. I'll believe it when I see it.

 

[4-crime]

allegedly, its coming. I'll believe it when I see it.

Did you hear that from a reliable source?

 

[bg5gnc]

In the encryption(emergency?) options, there is an option to sound when pressing ptt, which can meet your requirements

 

[chrismol1]

Is this whats going on?

 

[CHangen702]

More for my knowledge than to actually use it. Has anyone setup a APX portable to use conventional TPT since they just added it to the newest firmware release? I did see in the release notes that it needs to be setup in a certain way vs just checking the box.

 

[GTR8000]

Before everyone gets whacker happy thinking they can have the radio sound a TPT whenever they key up...it only works on P25 repeaters, and the radio must receive the hang time carrier (at least 1 full second) before it will actually sound the TPT, otherwise you get bonked. It does not work on analog repeaters or simplex.

 

[CHangen702]

That's exactly the answer I was looking for. Ill try it on my Quantar for giggles but I wanted to have clarification to what I already assumed it was.

 

[nhfdcadet]

well its here with version 31 firmware with some limitations. It only works on a repeater channel, not available on talkaround, and if you have the talk permit tone enabled on the astro personality, it will "bonk" you if you are out of range of the repeater, just like a trunked system.

 

[kayn1n32008]

You could set MDC to be pre and do a PTT Sidetone

Can't use MDC on an ASTRO personality...

 

[KevinC]

Before everyone gets whacker happy thinking they can have the radio sound a TPT whenever they key up...it only works on P25 repeaters, and the radio must receive the hang time carrier (at least 1 full second) before it will actually sound the TPT, otherwise you get bonked. It does not work on analog repeaters or simplex.

So you will transmit twice I'm guessing. Once to hear the hang time and the second to actually talk. Interesting.

 

[gatekeep]

So you will transmit twice I'm guessing. Once to hear the hang time and the second to actually talk. Interesting.

In testing the radio transmits a P25 TSDU; waits to hear the repeater come up with a TDU tail stream, and if it does gives positive TPT and begins normal conventional voice. If it doesn't detect the repeater come up with a TDU tail stream, you pretty much immediately get the negative TPT bonk.

 

[GTR8000]

So you will transmit twice I'm guessing. Once to hear the hang time and the second to actually talk. Interesting.

Negative, the radio detects the carrier....err while typing @gatekeep's post popped up. What he said lol. One PTT, just hold it down and wait, just like trunking.

 

[KevinC]

Negative, the radio detects the carrier....err while typing @gatekeep's post popped up. What he said lol. One PTT, just hold it down and wait, just like trunking.

So you transmit twice.

 

[gatekeep]

So you transmit twice.

Essentially yea, the radio will transmit twice (assuming a positive TDU tail) for a valid voice call.

EDIT: The radios operational procedure is identical to trunking really, when you hit the PTT; it'll transmit a voice grant request to the CC, wait for response, switch to the voice channel then begin transmitting. Difference here is, it transmits, and waits to hear the repeater come up with tail, then just transmit voice.

 

[GTR8000]

So you transmit twice.

Well, technically the radio is transmitting twice, the human is only "transmitting" once.