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

Mon Mar 11 14:00:06 UTC 2019

Thank you for the information. It is a URIx

--Bret Taylor
Olympia School District

On Mon, Mar 11, 2019 at 5:32 AM Kevin Custer <kuggie at kuggie.com> wrote:

> I apologize - this is long, but it's necessary (I think)?
>
> The COS and PL "hardware" logic inputs on the radio adapter were
> originally the volume-up and volume-down functions, actuated by manual
> (push button tactile) switches in a standard audio adapter (FOB).  These
> inputs are internally pulled high, to 3.3 V, and have to be pulled low
> enough to become valid.  As such the push-button switches made a good
> ground when depressed, as that's what the other side of the switch was tied
> to - ground.  Most AllStar radio adapters use protection diodes (BAT-43's)
> that don't allow voltage to be sent into the CM1XX chip.  If voltage is
> allowed to be inputted to these pins, the chip is destroyed. So - with the
> diodes in place, it doesn't matter what voltage is present on the COS or
> CTCSS hardware inputs, because voltage on these pins doesn't make anything
> happen, and because of the protection diodes, doesn't hurt anything if
> voltage is present.
>
> Okay, so the CM108/119's logic inputs are looking for a ground to be
> valid.  This "active low" condition is required NO MATTER if the setting in
> the conf file is upright or inverted.  So - the setting in the
> configuration file doesn't change the fact that the adapter needs an active
> low to be valid and assert the condition.  All this software setting does
> is change if the low condition exists when the radio is hearing a valid
> signal, or when it's not.  Using a DMM, you can read the voltage on the
> CM119 side of the BAT-43 diodes to see if the logic level is properly
> changing from 3.3 to 0.0 (or a few tenths of a volt).
>
> Not all radio logic signals are created equal.  Some logic circuits can
> source current, but lack the ability to sink.  Sometimes active high
> circuits (circuits that provide a voltage when the state becomes active)
> don't have the ability to pull to ground very well. These circuits may not
> have the capability to pull the COS and CTCSS inputs low enough on the
> radio adapter to become valid/active.  A pull-down resistor can help, but
> nothing beats a real active low circuit.  A 2N2222 (or similar NPN
> transistor) with the emitter grounded usually works well. Use the collector
> to feed logic to the radio adapter and use a suitable bias resistor to the
> base.  Of course, if you happen to find a place that goes to ground when
> the receiver is active (or vice versa), it should work as-is, again, as
> long as it's active low.  The resistor can be any wattage 1/8 watt or
> higher. Its value isn't critical either, a 1k to 47k would likely be
> acceptable.
>
> Is the radio adapter a URI, URIx, or URIxB?
>
> Hope this helps..
>
> Kevin W3KKC
>
>
> On 3/11/2019 8:19 AM, Bret Taylor wrote:
>
> 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
>>
>>
>> _______________________________________________
>> App_rpt-users mailing list
>> App_rpt-users at lists.allstarlink.org
>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>
>> To unsubscribe from this list please visit
>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users and
>> scroll down to the bottom of the page. Enter your email address and press
>> the "Unsubscribe or edit options button"
>> You do not need a password to unsubscribe, you can do it via email
>> confirmation. If you have trouble unsubscribing, please send a message to
>> the list detailing the problem.
>>
>
> _______________________________________________
> App_rpt-users mailing listApp_rpt-users at lists.allstarlink.orghttp://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>
> To unsubscribe from this list please visit http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
> You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.
>
>
> _______________________________________________
> App_rpt-users mailing list
> App_rpt-users at lists.allstarlink.org
> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>
> To unsubscribe from this list please visit
> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users and
> scroll down to the bottom of the page. Enter your email address and press
> the "Unsubscribe or edit options button"
> You do not need a password to unsubscribe, you can do it via email
> confirmation. If you have trouble unsubscribing, please send a message to
> the list detailing the problem.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.keekles.org/pipermail/app_rpt-users/attachments/20190311/e3777e95/attachment.html>