Problem Receiving DMR? Always Garbled

[n5gqb]

Just got my G5 back from having the dmr upgrade. For starters I programmed in one of our local amateur 440mhz dmr repeater. After reading a few threads on how to program the dmr stuff, I got all the parameters set. I sent the program to the radio, went fine, no errors or such. I tune to the zone/channel where this repeater was. However all the received signals were garbled, even though I was in good range of the repeater and my TYT & SDS-100 was receiving the signals just fine. I had one channel set with Time Slot 1 and another for Time Slot 2. I was using the wildcard FFFCDF/16776415 to be able to receive all talkgroups. Many folks have commented this # works and their radios receive fine. My garbled transmissions were 100% always garbled, all transmissions, no clear spots. For those who know the sound, it sounds kinda like when listening to a p25 encrypted talkgroup (all garbled) with a scanner that will pass the audio through on such. It does not sound like a weak signal garbling. Any ideas?
Model # g5b67bf-sxucen1401
PPS ver 0.3.14.15
Tab 2 -Freq entered as conv 12.5 bandwidth, signal activity timeout default 600ms
Tab 3 created 2 dmr protocol's TS1 & TS2
Tab 4 created 1 dmr talkgroup with wildcard
Tab 5 Selected monitor mode, then selected the repeater freq in the "conv freq" drop down. Set protocol to dmr and alias to proper TS. Color code to correct #. Checked repeater mode box. Enabled the wildcard talkgroup at the bottom of page. Everything else in Tab 5 was default, then sent to radio.
I have not (yet) created some individual talkgroups to try that. I have not tried any other tier 2 repeaters or systems.
FWIW-all p25 and fm stuff is received fine.
Thanks, Sly n5gqb

 

[NParkNJ]

Well the only problem I can think of strictly is to do with DMR itself.

DMR is not 12.5k spacing. DMR is TDMA, 6.25

My suggestion would be change that, and see then.

 

[jonwienke]

DMR uses 12.5KHz channel spacing. 2 timeslots on a 12.5KHz channel.

6.25KHz spacing is used for FDMA technologies like NXDN.

 

[GTR8000]

Bandwidth, not spacing. They can be two mutually exclusive things. Bandwidth refers to the amount of space a signal occupies, while spacing refers to the amount of space in between frequencies within a given band.

A NXDN signal can use 6.25 kHz of bandwidth in a band that uses 12.5 kHz spacing, while a DMR signal can use 12.5 kHz of bandwidth in a band that uses 6.25 kHz spacing, and so on.

DMR and P25 Phase II both occupy 12.5 kHz of bandwidth. The TDMA slots are not side-by-side as in 6.25 kHz x 2 = 12.5 kHz, but rather they alternate rapidly (hence the "time" in Time Division Multiple Access), and therefore each time slot occupies most of the 12.5 kHz bandwidth when active.

Now back to your regularly scheduled programming...

 

[n5gqb]

Thanks so far, I am still combing through things on the programming and trying some other misc settings that shouldn't really matter but maybe it will. I also looked at N6ML's dmr programming he had put up on here somewhere and it all looks the same (except freq/cc of course). Anyway if it somehow starts decoding properly by some means I'll pass along.

 

[N6ML]

Thanks so far, I am still combing through things on the programming and trying some other misc settings that shouldn't really matter but maybe it will. I also looked at N6ML's dmr programming he had put up on here somewhere and it all looks the same (except freq/cc of course). Anyway if it somehow starts decoding properly by some means I'll pass along.

I definitely heard quite a bit of garble when I last tried, but I couldn't tell if that was actually coming through the repeater or/and the fact that VHF on the G5's internal antenna inside my house wouldn't be optimal. A fair amount of the traffic was copyable, though.