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Digital Voice via RaspberryPi

 

Overheard a conversation on a repeater the other day that was very
interesting.

The person claimed he had a basic 2 meter analog radio and connected a
Raspberry Pi via Digirig interface which allowed him to run all digital
modes, Fusion, DMR, D-Star, P25, and others. I would be very interested
in this. Does anybody have any idea on what software this may be? Or is
it just a lot of smoke?


--
73,
Michael WA7SKG

"Any day you do not learn one new thing is a wasted day."
 

On 31/10/2024 23:33, Michael WA7SKG via groups.io wrote:
Overheard a conversation on a repeater the other day that was very
interesting.

The person claimed he had a basic 2 meter analog radio and connected a
Raspberry Pi via Digirig interface which allowed him to run all digital
modes, Fusion, DMR, D-Star, P25, and others. I would be very interested
in this. Does anybody have any idea on what software this may be? Or is
it just a lot of smoke?
Well you would need a 2mtr radio with a 9600 baud packet port as most of the DigiModes use similar types of modulation to get two audio channels into one normal channel.

You could then probably tweak DudeStar or DVBridge to decode the DMR FSK..


--
73,
Michael WA7SKG
Dave

G4UGM



"Any day you do not learn one new thing is a wasted day."
 

Never used it and think you need an interface but this is the software.

I know a few people that use this but it has never been anything I am interested in but you should get plenty of help there.
?
Regards Richard G7OED
 

There may be some smoke.
?
However, there are products such as the ThumbDV from NW Digital Radio (and other dongles that contain an AMBE chip) that allow the use of software such as BlueDV that allow one to use any device such as a smartphone or PC, so piping a 2m HT’s signal from a digirig or similar device doesn’t seem like too far of a stretch, but it would be far easier to just get a digital handheld and/or use the audio in/out of the computer to which the ThumbDV (or other device) was connected.?

Some people, myself included on occasion, just like to see if it can be done, regardless of the ultimate feasibility of the solution.
?
So yeah… most likely possible. Not the most user-friendly solution, and convoluted, but not much more convoluted than a DMR->D-STAR gateway on a hotspot, since an AMBE chip is required for that also. (Analog->Digital is not available on the Openspot 4 Pro, from what I understand.)
?
Once my brain heals and I catch up on other projects I might give it a try.
?
Cheers and 73,
Mike AC0K
 

I suspect that you'd also need an AMBE2 dongle for this, and also a USB sound card for handling the microphone input - presuming, of course, that he was talking about actually working the digital modes, rather than just monitoring them.
?
73
Phil
2E0HGU
 

Droidstar allows all but D-Star to work without the AMBE chip including the new M17 mode. Google it.?
--
Bob AF9W
 

I found a bunch of stuff about DroidStar and other stuff using an AMBE
dongle, but, so far, nothing about how to interface it to a radio. They
all seem to be some kind of interface to on line nodes like AllStar.

My goal is to be able to use P25 and DMR on an existing analog radio via
a RaspberryPi and audio interface.

Thanks,
Michael WA7SKG



Bob AF9W wrote on 11/1/24 7:35 AM:

Droidstar allows all but D-Star to work without the AMBE chip including
the new M17 mode. Google it.
--
Bob AF9W
 

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As I understand it, you can use a standard sound device like a Digirig to do modes like Dstar (GMSK), YSF (C4FM), and P25-Phase1 but DMR requires deeper control of the RF waveform.? As such, you need an RF board like a "MMDVM hotspot" board / a Zumspot board / DV-Mega / OpenSpot appliance / etc (which can do all modes btw):

?? #Here is an example of a MMDVM hotspot RF board
??


Here is one guide I found on how to set this all up yourself:

??

If you rather buy something pre-built and with support, consider an OpenSpot:

??


--David
KI6ZHD



On 11/03/2024 08:12 AM, Michael WA7SKG wrote:

I found a bunch of stuff about DroidStar and other stuff using an AMBE
dongle, but, so far, nothing about how to interface it to a radio. They
all seem to be some kind of interface to on line nodes like AllStar.

My goal is to be able to use P25 and DMR on an existing analog radio via
a RaspberryPi and audio interface.

Thanks,
Michael WA7SKG



Bob AF9W wrote on 11/1/24 7:35 AM:
Droidstar allows all but D-Star to work without the AMBE chip including
the new M17 mode. Google it.
--
Bob AF9W






 

Don't think you can do that.
A hotspot is an interface between your digital radio and the internet.
Most common hand held FM radios have neither the bandwidth or short enough switching times.

On 03/11/2024 11:12 EST Michael WA7SKG <wa7skg@...> wrote:


I found a bunch of stuff about DroidStar and other stuff using an AMBE
dongle, but, so far, nothing about how to interface it to a radio. They
all seem to be some kind of interface to on line nodes like AllStar.

My goal is to be able to use P25 and DMR on an existing analog radio via
a RaspberryPi and audio interface.

Thanks,
Michael WA7SKG



Bob AF9W wrote on 11/1/24 7:35 AM:
Droidstar allows all but D-Star to work without the AMBE chip including
the new M17 mode. Google it.
--
Bob AF9W
 

Michael,

So something like the ClearNode but the price is eye-watering.



I could buy a DMR radio, Pi and MMDVM hat for much less, and drive everything without needing a Smart Phone and app to configure.

In fact if you read the manual you will see why this isn't more common. A DMR radio sets the sending and receiving codes. On a talk group it displays the call sign of who is transmitting.

Whilst you can do some of this via DTMF codes some has to be configured on the PI and as PIs don't have keyboards it can be fun.

Dave

G4UGM

On 03/11/2024 16:12, Michael WA7SKG via groups.io wrote:
I found a bunch of stuff about DroidStar and other stuff using an AMBE
dongle, but, so far, nothing about how to interface it to a radio. They
all seem to be some kind of interface to on line nodes like AllStar.

My goal is to be able to use P25 and DMR on an existing analog radio via
a RaspberryPi and audio interface.

Thanks,
Michael WA7SKG



Bob AF9W wrote on 11/1/24 7:35 AM:
Droidstar allows all but D-Star to work without the AMBE chip including
the new M17 mode. Google it.
--
Bob AF9W
 

You can do this using Analog Reflector in a DVSwitch server but unless you have some Linux command line experience it is difficult to implement.?
--
Bob AF9W

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