[Allstar Digital] DMRGateway configuration

[Steve Zingman]

I know it's been rather quiet lately. Mike and I have been working on a 
number of Digital and Analog projects. Some will be demonstrated at 
Dayton, so we are coming down to the wire. I have been configuring 
DMRGateway on a Micro-Node DPAC for the show. It's built on the next 
revision of DIAL for the RPi. Though most of the underlying Asterisk, 
DMRGateway and DMRlink code is mostly unchanged I ran in to something 
"interesting"

Consider the DPAC. It's a dual node AllStar server with 2 radio ports, 
hardware real time clock, serial console port and dual TFT displays. it 
mounts in a 1 RU box. For the demo, I set it up with 2 analog repeaters 
and a DMRGateway. The idea is that the DMRGateway is a "private" node 
(1997) if either of the 2 analog repeaters wanted DMR access they could 
just connect to 1997 and they would be on DMR. Pretty much the same way 
that anyone might setup a tightly controlled ASL <---> DMR Gateway. 
Using the remote control ability built into ambe_audio a analog user can 
change to pre-defined TS / TG configurations with DTMF. This can also be 
done from Allmon2. There is also a standalone client coming called 
DMRGui. Think a DMR node with a local mic and speaker.

Now comes the issue. We know that a DMRGateway node should be setup with 
duplex = 0 and comment out the idrecording and idtalkover entries so no 
ID goes out over DMR. With a duplex = 0 there should be no hang time or 
telemetry. Or so would one think. Turns out that the USRP channel driver 
still uses the hangtime and possibly the alt hangtime values. If you 
just comment them out, you get the default values of 5000 ms. Set 
hangtime and althangtime to 0 !!!
Otherwise there is a hang time between the drop of the input analog 
signal and the drop of the outbound DMR signal.

We are checking the code now, and we THINK it's in the USRP channel 
driver. Not sure it's a negative yet. There is a small hang built in 
DMRGateway on purpose.


For INAD, 73 Steve N4IRS

-- 
"Anything is possible if you don't know what you are talking about."
1st Law of Logic
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