OpenGD77

Does OpenGD77 allow sending location via DMR (digital aprs / dprs?)?
Retevis RT3S has this in the original firmware.

SP9PLN wrote: ↑

Mon Dec 18, 2023 12:29 am

Does OpenGD77 allow sending location via DMR (digital aprs / dprs?)?
Retevis RT3S has this in the original firmware.

In-band aka Talker Alias GPS data can be sent, but not SMS GPS data.

SMS is not supported and probably never will be due to patent and other problems with proprietary and undocumented SMS data formats and protocols

So if I want to send APRS data to id 260099, to which the coordinates are sent, I select "APRS" in the repeater settings in talker alias 2 and it is sent after pressing PTT to this id?

SP9PLN wrote: ↑

Mon Dec 18, 2023 1:56 pm

So if I want to send APRS data to id 260099, to which the coordinates are sent, I select "APRS" in the repeater settings in talker alias 2 and it is sent after pressing PTT to this id?

No.

The supported DMR GPS functionality is not via SMS, it's via Talker Alias and is not part of the FM APRS settings.

See

https://github.com/LibreDMR/OpenGD77_Us ... #ta-tx-tsx

AFIK TA Tx of APRS / GPS data is only supported by Brandmeister, and you need to enable In Call GPS in the Self Care settings and also set the "Brand" to ETSI.
The Brand has to be set, becasue unfortunatly there are multiple In-Call GPS / APRS protocols used by different commercial radios.
e.g. Kenwood , Hytera, Motorola, "Chinese" radio etc etc etc


In-Call GPS does not use a specific TA or ID you need to transmit to, transmitting on any TG for long enough will send the In-Call GPS data

However, the In Call GPS data is sent very slowly and you would probably need to hold the PTT for about 5 seconds to send it.
(I don't know the exact duration, possibly 4 or 3 seconds would be long enough, you would need to confirm the mimum Tx duration)

In-Call GPS is designed so that no additional transmissions are needed, i.e simply using the radio for normal communication sends the data during a normal voice call.

Thank you for your help.
Everything worked exactly as you wrote.
I held down PTT on Echo for 5 seconds and the location was sent.
This is what I ment.
Regards.