[App_rpt-users] GE Mastr III and DMK USB-URI

[Bret Taylor]

"What channel driver are you running?  This will determine what sort of
audio
you need from the system and where squelch is performed."

I'm using a Bridgecom MV-i1 to drive the URI -
https://www.bridgecomsystems.com/collections/tl-net/products/mv-1

I don't know exactly what is under the hood. Their "OS" is called TL-Net.
But under that is Raspbian. I have a network of TRBO repeaters that the
MV-i1 taps into through IP Site Connect.

I'm trying to bridge the TRBO repeaters to this Mastr III base station.
I've already created a cable using the info from
http://www.repeater-builder.com/ge/mastr3/m3-ctrl/m3-ctrl.html

I created a bridge group in TL-Net to bridge the analog interface to IPSC
masters. I can PTT on a DMR programmed to the correct Call Group, and hear
it on a Analog radio tuned to the Mastr III frequency.  But I can not hear
the Analog radios return, it doesn't seem to trigger the URI.

If I use pin 8 on the URI (active low) and connect it to P5-17, or P5-20
(COR & CTCSS both Active High) on the Mastr III backplane, the URI goes
into a broadcast storm. Using any of the optional pins for COR (2 & 3 both
listed as active high) nothing happens. I suspect since these are GPIO, the
configuration (for the URI?) is incorrect.

I know the URI works, as I was able to use it to drive an XPR5550e
programmed to the analog frequency of the Mastr III. It's just not the best
situation to run it like that. You clearly hear dispatch, but since I'm not
tapped onto the return path of the antenna connected to the Mastr III, the
mobiles response clarity is dependent on the proximity to the antenna of
the XPR5550e.

"Double check your programing too, as the Mastr III IO is based on
programing.
 You'll need to ensure you have your de-empahsis and pre-emphasis setup
properly too."

I do not have the Mastr III programming software (and can't seem to find it
anywhere). Another user in this list says he has it, but it searching for
it. So, I have no idea how it's programmed. It's possible the backplane
connecters for audio out are disabled?

Thanks for your help.

--Bret Taylor
Olympia School District


On Fri, Mar 8, 2019 at 7:49 PM Bryan Fields <Bryan at bryanfields.net> wrote:

> On 3/8/19 6:21 PM, Bret Taylor wrote:
> > Has anyone successfully interfaced the DMK USB-URI to a GE Mastr III
> > repeater/base station?
>
> I think a few have, I've not personally done this.
>
> > I've got transmit working correctly, but can seem to get the received
> audio
> > back into the device correctly.
>
> What channel driver are you running?  This will determine what sort of
> audio
> you need from the system and where squelch is performed.
>
> There is some info on this page and I suspect it will be trivial to use
> this
> to build a cable to interface to the Mastr III.
> http://www.repeater-builder.com/ge/mastr3/m3-ctrl/m3-ctrl.html
>
> Double check your programing too, as the Mastr III IO is based on
> programing.
>  You'll need to ensure you have your de-empahsis and pre-emphasis setup
> properly too.
>
> If you get a working config, please consider adding it to the wiki or
> posting
> here.
>
> https://wiki.allstarlink.org/wiki/Radio_Connections
>
> 73's
> --
> Bryan Fields
>
> 727-409-1194 - Voice
> http://bryanfields.net
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