APX conventional TPT?

[tmahoney748]

Simulcast?

Yes simulcast

 

[tmahoney748]

In addition to checking repeater hangtime, it's possible that the preamble length of your defined conventional system is a little short
in duration. I want to recall the APX defaults to 80 or (80 x 0.2083) 16.66 ms in length for conventional systems and 120 (120 x 0.2083)
or about 25 ms for trunking systems.

Prior to enabling TPT, you would have simply keyed the radio and began speaking that presumably would have provided a long enough interval for the system to sync up and begin repeating your transmission. With TPT enabled, the transmission is shorter as it's interrupted
while the SU's receiver is looking for the handshake so to speak. It won't hurt to bump it up for a test.

I’m going to bump it up to 120 and test then maybe go up from there.

 

[KevinC]

Yes simulcast

Stupid question. Is your digital modulator set to CQPSK?

 

[tmahoney748]

Stupid question. Is your digital modulator set to CQPSK?

C4FM
Rx Unmute Rule Normal Squelch

 

[KevinC]

C4FM
Rx Unmute Rule Normal Squelch

Simulcast needs to be CQPSK. You probably have other issues as well with it being set to C4FM.

 

[KevinC]

And I'm assuming a Motorola simulcast and not a Harris or other brand that for some reason tries to use C4FM for simulcast sometimes (no wonder they sound like crap ).

 

[tmahoney748]

I’m going to test it a little more after switching to CQPSK and lengthening the preamble. It bonked me a couple times after but I was in the confines of our concrete block firehouse (lol). Thanks for your help I’ll probably be back on here if that doesn’t work.

 

[KevinC]

I’m going to test it a little more after switching to CQPSK and lengthening the preamble. It bonked me a couple times after but I was in the confines of our concrete block firehouse (lol). Thanks for your help I’ll probably be back on here if that doesn’t work.

Ok. No matter what, your digital modulator needs to be set to CQPSK (assuming your system is LSM, which it is if it's MSI).

 

[tmahoney748]

Ok. No matter what, your digital modulator needs to be set to CQPSK (assuming your system is LSM, which it is if it's MSI).

I’m gonna reach out to the company that built and maintains our system just to make sure… especially if it involves me programming 100+ radios 😂

 

[KevinC]

I’m gonna reach out to the company that built and maintains our system just to make sure… especially if it involves me programming 100+ radios 😂

If they give you any crap send them my way.

 

[billy2047]

does anybody want to make a youtube video just for the conventional TPT