[arm-allstar] Weird URI problem

[KH6KL]

On 11/14/2015 3:05 PM, David McGough wrote:
> Hi Pat,
>
> Is this system a BeagleBone Xm or BBB?
>
> If it's a BBB, how are you powering it (e.g.: A DC-DC converter)??  The
> BBB is very sensitive to the +5VDC power source and -any- USB related
> power spikes can cause the condition you're describing.
>
> 73, David KB4FXC
>
>
>
> On Sat, 14 Nov 2015, KH6KL wrote:
>
>> 11.14.2015
>> I'm not sure which board to post this on...
>>
>> My repeater is a Motorola R1225, 25Watts, w/ PL. The computer is a
>> BeagleBoneBlackC. I'm only using the COS, PTT, Rx Audio, Mic and ground.
>> This system has been working on the AllStar Network since May 2015.
>>
>> About 2 months ago a weird problem started: The Xm hangs on, but PTT
>> voltage is at 5v. The URI red led is off. If I just wait the timeout
>> timer kills the Xm but the the PTT doesn't work until I reset the 1225.
>> The Rptr Rx led is off the whole time, so there's no incoming signal.
>> This only happens when the URI is connected to the accessory plug. I put
>> my spare R1225 on-line and the same thing happens.
>>
>> Note: I have everything working off of an Astron SS30 power supply. I
>> looked for ground loops, but didn't find any.
>>
>> I borrowed an URI and the system worked perfectly. I returned the URI
>> and put the repeater on-line/stand-alone for two weeks with no problems.
>>
>> I sent the URI back to DMK engineering and it passed their test, so it
>> was returned to me. I put it on line and the same problem started again.
>> I swapped the the two URIs and my machine worked perfectly but the other
>> machine started to kerchunking by itself. I returned the borrowed URI,
>> and put my machine on-line/stand-alone.
>>
>> I would like to know if anyone has had this problem and what was your
>> solution.
>>
>> I called DMK engineering to see if they would warranty the URI, no
>> decision yet, but I ordered a new URI to get this node working.
>>
>> Aloha,
>> Pat
>> KH6KL
>>
>>
>>
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David,

The system is a BBBc. I'm using a Murata 78SR-5/2-C, 5V 2A (3A peak) 
DC/DC converter.
I have replaced the Astron SS30 with a Linear power supply and the URI 
with a new one. System is working except for the audio.

Thanks for the help.

-- 
73 from the Land of the Pakipika...
Aloha,
Pat
KH6KL

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