FM Repeater to DMR Talkgroup? #best_practices
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Hello,
I would like to connect an analog FM Relais (Scanner) to my local HBlink-Server and transmit the audio signals to a DMR talk group, e.g. 777. This is intended for a local server, with no DMRPlus etc. connected, private only. Is there a guide for this, which I could read, or can someone here help me? It'd already be enough if only the analog RX signal is transmitted to the talk group. How can I make this happen without the use of Crosslink, ASL, Echolink or multiple devices? I have available: Raspberry, DVThumb, UriX and all this stuff here. What can I do? Thank you Rudolf
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I can not point to a guide or give you much advise outside of this. Be sure your audio is clean before converting to digital. Little
noticed noise in analog can be a big issue in digital. Humming,
buzzing and pops are not going to give you readable audio
converted to digital. It's hard to believe how much it matters. I do know you have a option for a rtl softradio input to allstar/asterisk connection and it is documented out there somewhere. Perhaps others will chime in with that and more info than I. Connect it to a private node for control so you can
connect/disconnect at will/as needed.
On 2/29/2020 12:34 PM, Weller Rudolf
wrote:
Hello,
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I am sorry, I missed the most obvious reply. Set-up a node as you would a radio with the sound FOB and just
use the audio input in VOX mode. Unless you can achieve a COR
signal from the receiver. If you are using a Pi, VOX may be
easiest. Just set it up for a private node. You should consult the allstar documentation for all that.
On 2/29/2020 12:34 PM, Weller Rudolf
wrote:
Hello,
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Hey Mike,
I didn't necessarily wanna set up an ASL node. Are there other options? I was hoping to get a connection simply via MMDVM and Analog_Bridge, without an extra node. My problem with an ASL node is that it keeps a permanent connection, and I just wanna transmit to a talk group when analog FM is spoken. Kinda like a real radio device. A COR signal is no problem, I have a Motorola GM360 connected to the URIx Interface Thanks for the help 73 Rudolf
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Well, the USRP interface is a A/D D/A bridge. Plugs right in to
your mmdvm. But it's not really a A/D D/A converter since the
format is all digital but one side is sourced from analog. It's
really just a D/D format converter. In asl, the sound fob converts
A/D. I have not 'seen' anything to the contrary but it may exist. And the 'easiest' way to manipulate that is using asl. But you
could bypass that. But I would be no help, except as I said in the
first msg, a rtl-sdr may be what you want in place of your
reciever. I know there are some doc's out there, however, I can't
point to them. Google would help. rtl-sdr --> usrp --> mmdvm
On 3/1/2020 4:47 AM, Weller Rudolf
wrote:
Hey Mike,
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Hi Mike,
thanks for all your informations. I think i will get ahead. A great forum, by the way ... thanks to everyone! 73 Rudolf
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Well, your only looking for ideas. Stick around for everyone to read and comment.
I would imagine you might also be able to pipe from a sound fob to the usrp. Never done it, but I think it would be worth exploring.
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David Martin
Hi Rudolf, Mike, I would suggest ASL with two 'private' nodes say 1999 & 1998 one connects to the URI the other USRP (Analog_Bridge). Connect 1999 & 1998 at startup in asterisk. There is no ASL involvement the only permanent link will be to DMR through MMDVM_Bridge. Just a thought or two David Martin VK3KQT
On Sun, Mar 1, 2020, 20:47 Weller Rudolf <t4.vw-bus@...> wrote: Hey Mike,
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Hello David,
that's a very interesting idea. I tried private nodes twice now, but it doesn't really work. I think my rtp.conf has the wrong configurations for nodes 1999 & 1998. DMR to analog seems to work. When I press the PTT on the DMR device, I can hear the CW output and an acknowledgement sound from the same device, but no sound whatsoever from the FM device. No red LED signal on the UriX either... When I press the PTT on the FM device instead, nothing happens at all, and DTMF sounds aren't recognized either. When I enter "rpt cmd 1998 cop 4 1998" directly into the Asterisk-shell, I can hear the sound from the DMR device and - with 1999 - also in the FM device. So the UriX seems to work. The startmacro in my rpt.conf is *31998. When I enter "rpt cmd 1998 ilink 3 1999" into the Asterisk-shell, I can speak from DMR to FM, not the other way round though. When I enter "rpt cmd 1999 ilink 3 1998" into the Asterisk-shell, neither DMR nor FM work. All I hear is a rogerbeep in the DMR device. Maybe someone can help, cuz I'm at my wit's end. 1999 - UriX 1998 - USRP Raspberry Pi 3 B+ Allstarimage von DVSwitch.org 73 and take care Rudolf
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