Digital APRS?

[K3WHO]

Hi, All

I'm very new to DMR and have some questions about APRS via DMR. I have it working fine over my hotspot. When I'm out and about can you transmit APRS packets through DMR repeaters or is that a no-no or not how it's meant to be done?

That's the gist of it. I have not been able to find a good guide on this subject and any help is greatly appreciated.

--Jason - K3WHO

 

[serial14]

I've yet to try the DMR -> APRS thing for position sharing, so take my opinion as just that.

However, given the other things I've done with DMR and various chats with the local repeater operator( both a ham and commercial 2 way guy ). If it works with your HotSpot it should work just fine on DMR repeaters. At least for my, local DMR repeater, doing so wouldn't be an issue at all. Its just a single packet that gets chirped out occasionally, that just happens to contain position information instead of voice data.

In basic terms, DMR is all based around packets that get routed around. The packets can contain data or voice, but they are still just a packet. Hot spots and repeaters are pretty "dumb" devices in the network overall. They just repeat or forward packets, they don't care whats inside of the packet( data or voice ). All of the smart stuff is implemented in the backend servers, not the "access layer" of repeaters and hot spots.

The one thing I still want to try out for my self that would apply both to text messaging and DMR->APRS( again, just packets ) is understanding how getting those short, one packet messages out interacts with the given Channel( Freq + TGID ) that your radio may be on.

 

[jeepsandradios]

In basic terms, DMR is all based around packets that get routed around. The packets can contain data or voice, but they are still just a packet. Hot spots and repeaters are pretty "dumb" devices in the network overall. They just repeat or forward packets, they don't care whats inside of the packet( data or voice ). All of the smart stuff is implemented in the backend servers, not the "access layer" of repeaters and hot spots.

Which means if the repeater isn't on a network it wont push your data out. Not all repeaters are on networks.

 

[K3WHO]

Good info. Thank you both. The packets are so fast I doubt they'd even be heard. Since it's a private call, it shouldn't open up a dynamic TG on the machine. As far as my limited understanding is telling me.

 

[serial14]

I can't remember the terminology used in the spec, so I'll just use what comes to mind. I believe there is a difference between a session( used for voice ) and one shot packets( used for data, txt, position ). The session stuff causes a repeater/hotspot to start listening to a dynamic TG for a specified amount of time or while its active. The one shot stuff just gets routed and that's it.

Again, this is based on my current level of understanding.

 

[popnokick]

Pennsylvania DMR repeaters on the WR3IRS Interstate network do not support APRS or GPS

Interstate DMR

www.delmarvadmr.com

 

[K3WHO]

Question answered. Thank's all.