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

[Bret Taylor]

Marshall is correct, and Marshall has helped me with this project as
well.... Thank you Marshall.

I suspect there has to be an underlying configuration file still. It's
still Debian under the hood. If I can get to it, and modify it... that is
still to be seen.

What wattage does the 47k ohm resistor need to be? 1/8, 1/4, 1/2, 1, 2?
Does it matter? Ditto on the NPN transistor. It sucks radio shack doesn't
exist anymore, it's now a pain to find the components locally.

Thanks

--Bret Taylor
Olympia School District


On Sun, Mar 10, 2019 at 10:54 PM Marshall Oldham <ke6pcv at cal-net.org> wrote:

> FYI,
>
>
>
> He is not using app_rpt software with the URI, he is using the Bridgecom
> MV-iL hardware with a URI to interface to his GE Mastr III
>
>
>
> So he can not set CORFROM=uisbinvert in software config.
>
>
>
> 73
>
>
>
> Marshall
>
>
>
> *From:* App_rpt-users [mailto:app_rpt-users-bounces at lists.allstarlink.org]
> *On Behalf Of *REDBUTTON_CTRL
> *Sent:* Saturday, March 09, 2019 5:24 PM
> *To:* app_rpt-users at lists.allstarlink.org
> *Subject:* Re: [App_rpt-users] GE Mastr III and DMK USB-URI
>
>
>
> 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
>
>
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