I'd put my money on the power supply. Living in the islands and working for the power company, there are a lot of blips on the grid and switching power supplies take a beating because of that. I have an Astron and a Samlex in the 20 to 30 amp range that are both junk because of that. Put a meter on them and they look fine.. put a scope on them and load them and they go to hell. If you have a linear power supply or a big battery, give that a shot and see if the problem goes away‎. My 2 cents worth.

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