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

Sun Mar 10 12:52:41 UTC 2019

Wow.

Jon, thank you for the information. I will keep you all posted, and will
post a working config for future reference (if I get it working). Pin 21 on
the DMK USB-URI is listed as MIC_IN_AC (AC Coupled). The Mastr III operates
on DC power, so I can only assume the signal from P5-10 on the Mastr III
(Receiver Volume/Squelch High (raw discriminator audio, NOT de-emphasized)
would be a DC signal? Will the AC coupling be an issue?

Thank you for all the help. It is greatly appreciated.

--Bret Taylor
Olympia School District

On Sat, Mar 9, 2019 at 5:32 PM REDBUTTON_CTRL <jrorke at cogeco.ca> wrote:

> Bret, one thing to know about the URI is that the COR input line (pin 8)
> requires a signal transition to pull to ground. This is different that a
> signal that sources voltage and goes low. the URI has internal pullup
> resistors so it doesn't look for voltage change.
>
> So what this means is if the CAS/COR out line on the Master III does not
> pull to ground when it goes low, the URI will not see a signal change. The
> URI has a dc blocking diode on its input. So it needs to see a signal that
> either goes low when the receiver is active or when it is inactive.
>
> If the Master III CAS/COR is active hi then I suggest you connect the
> CAS/COR through a 47K resistor then to the base of an NPN transistor. Then
> connect the collector to pin 8 on the URI and connect the emitter to
> gorund. This will invert the CAS/COR signal and give an open collector that
> goes to ground on receiver activity.
>
> Then in the Allstar node set the CORFROM=usbinvert.
>
> This means the URI will be looking for a signal to ground pin 8. then
> audio will be sent through the system.
>
> Hope this helps.
>
> Regards,
>
> Jon VA3RQ
>
> On 3/9/2019 8:26 AM, Bret Taylor wrote:
>
> "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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>
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