Unable To Listen To DMR Service on SDS100

[rkillins]

I am sharing this question here as it specifically relates to a monitoring problem I am having with a DMR service. It shares the the same issue of being unable to monitor it also with DSD+ that I have shared in this forum thread. (I hope this is not considered a cross-thread. My apologies if so.)

I am trying to monitor a local utility company's DMR conventional frequency. I have copied the information from my SDS100 master database to a favourites folder. I do have the DMR upgrade, and am successful in monitoring other DMR traffic. Utilities is active in my service selection.

I can see when the SDS100 locks onto a signal. The signal bar activates, slot 1 flashes, and their is a rapid flickering between DMR and CAP+. I get no sound.

I've captured 2 videos of the display when the channel becomes active. Perhaps someone is able to provide some insight as to what is going on.

Video1
Video2

 

[u2brent]

As in the DSD+ Thread, Your scanner is having a hard time because the scanner can't even determine the proper signal type. It's likely not Conventional DMR since a Site ID occasionally shows on the display. (This would not occur on a true properly decoded conventional DMR transmission) The scanner needs those other frequencies entered with the correct LCN numbers as well. So it knows what frequency to tune to when a call is placed. Also there are issues with Uniden scanners on DMR T3 trunk tracking, If it works at all, Based on my recollections on the subject.

 

[Ubbe]

Can you set the display to indicate D-ERROR as that would also help. Your DSD+ thread shows that the channel use RAS which means that the scanner will ignore any checksums and will more easily false decode the datastream. D-ERROR should be 5 or lower with a good signal strenght.

Just enter the channel as conventional by doing CHANNEL+frequency+CHANNEL and the scanner will try and automaticly decode the signal regardless of what type it is.

Note if the channel sends out short idling databursts with 1-10sec intervals. If not then it's probably a pure voice channel that has a linked control channel on another frequency.

/Ubbe

 

[rkillins]

Hi Ubbe, I haven't found much documentation on how to enable D-Error. Can you share?
I've programmed the raw frequency 169.485. I get periodic noise, but I'm not seeing much on the display other that the signal bars popping up.

 

[rkillins]

It appears that we've made some progress in determining why my challenges with monitoring. It is suspected that despite RRDB's information (old data perhaps) that I'm trying to monitor a Tier 3 system with insufficient information. Until the missing pieces are collected and assembled, I think I'm out of luck.

Thanks all, but I think I'll post this thread to rest and focus on the DSD+ thread. Perhaps if I'm lucky DSD+ will help in narrow down the particulars of this system.

 

[Ubbe]

Ok, then use your scanner to search the frequency range after the rest of the channels with the same color code and put all those in the same site and do LCN finder on them.

/Ubbe