DMR TG99 - DMRsimplex

[N4KVE]

Since this does not involve the repeater, you can use any color code to make the group somewhat private. With modern scanners and radios like the CS 580, there is nothing in the ham band that cannot be monitored. CC 1 and TG 99 are the defaults most use, but there is no requirement to that combo.

Exactly. Otherwise everyone would be using 146.52 for analog simplex. Could you imagine trying to keep in touch with your friends at a ham fest on 146.52? This is why my friends, & I do NOT use the established simplex freq's. We do not want to cause interference to others.

 

[fdnyfish]

so what is the difference between TG99 and using ALL CALL 16777215?

Do you use ALL CALL only on a repeater?

 

[ertony]

In the documentation that I have read, DMR talk group 99 is listed as DMRsimplex. However, when I program this talk group into DMR simplex channels in my radios, I am not able to talk from radio to radio when a DMR simplex frequency is selected. Is this not the correct use of talk group 99?

John AC4JK

Surprised nobody was able to answer your simple question.

There are 2 possibilities you have come to your predicament:

The reason you are only getting a receive indicator light and no audio is because the transmitting radio simplex talkgroup is set to transmit as a "private" call. You must configure your radios to transmit as a "group" call. The workaround to fix your already programmed radios is turn "monitor mode" or "promiscuous mode" on (depending on your radio) and it will break the squelch and allow you to hear the transmission. Otherwise, you will have to go in and change your transmit to "group call".

The other possibility if you have a radio like the Radioddity GD--77 or anything that runs on its platform (baofeng rd-5r, etc) is that you MUST have a Receive Group programmed into your channel or it will not open squelch (unless you again, turn on 'monitor mode' or 'promiscuous mode'). The fix is to create a "Receive Group" with the "Simplex" talkgroup in it (99) and put it as your "Receive Group" on your simplex channel.

 

[KE5MC]

**PROBLEM SOLVED**


John AC4JK

John,
Good to see its "fixed", but the clear source of the problem not really clear. It's kind of like PCB swapping which I never liked, but sometimes we had no other timely options.

For those commenting on two radios not talking to each other with the same ID, my Anytone868 does not care and the CS580 does.

Mike

 

[chief21]

Thanks for all the comments and suggestions, but this simplex issue is 'old news' by now.

Over the past months, I've moved on from the original DMR handhelds (MD380 and Tekk500) to an Anytone AT-D868 and, more recently, an Ailunce HD-1. Learning a lot!

- John AC4JK