Hang times for Dstar/DMR transmit

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Hang times for Dstar/DMR transmit

Post by g1gdb » Mon Feb 18, 2019 6:53 pm

can any one tell how best to set up these timers on my Pi -star hotspot, I use, and sometimes it can be a pain waiting to it resets during a chat, I have just reset both timers for Dstar/Dmr from 20 down to 10 on both RF and net settings, I would be interested in getting comment on this subject. to see if it is of benefit on reducing this timer.
Derek G1GDB ;)

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Re: Hang times for Dstar/DMR transmit

Post by AF6VN » Tue Feb 19, 2019 6:27 pm

To my understanding, the timers are only significant IF one is using (any two or more) modes at the same time.

The purpose is to prevent the mode switching too soon and blocking one out from making a response (that is: say one has been listening to D-Star and decides to respond... If the timer is set too short, a new DMR conversation could grab the circuit, blocking out your D-Star response).

If set too short (1 second), it basically becomes a case of "most recent mode with traffic gets radio". This could make it impossible to have a conversation if multiple modes are busy, as one may not be able to key up the hotspot. OTOH: if set fairly long, one might lose entire conversations on the other modes while waiting for the last-used mode to time out.

Dennis L Bieber

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Re: Hang times for Dstar/DMR transmit

Post by KE0FHS » Tue Feb 19, 2019 11:00 pm

To add to what Dennis shared, here's a visual explanation of how the Radio Info TRX section works (for simplex modems):

1. When you are connected to one or more modes and there is no activity on any of them, the Radio Info TRX section will be green and will display "Listening." If multiple modes are enabled, while in this status, the modem will monitor all active modes in turn:
pi-star-radioinfo-0-listening-all.jpg (12.56 KiB) Viewed 1443 times
2. If you transmit and the modem receives it, the Radio Info TRX section will be green and will display "RX [mode]." If the modem receives a transmission from someone else and transmits it to your radio, the Radio Info TRX section will be red and will display "TX [mode]" (if the mode is DMR, it also displays the time slot). While in the TX status, you can't break in with your own transmission.
pi-star-radioinfo-1-rxtx-dmr.jpg (24.29 KiB) Viewed 1443 times
3. Immediately after RX or TX status and for the length of the hangtime, the TRX section will be orange and will display "Listening [mode]." While in this status, you can transmit or receive, but only in the mode that the modem is listening to:
pi-star-radioinfo-2-listening-dmr.jpg (13.27 KiB) Viewed 1443 times
4. If no new activity occurs during the hangime, the TRX section will revert to general "Listening." While is this status, you can transmit or receive in any active mode.
73, Toshen, KE0FHS
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Re: Hang times for Dstar/DMR transmit

Post by w7efs » Wed Feb 20, 2019 1:18 am

Thank you, your use of images enhances the explanations you offered. I'm curious please, if a repeater station were using only a single mode, what would be the consequences of RF/Net Hangtime == 0 ?

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