SDS100/SDS200: DMR cap+ system using RAS or encrytion?

[n5gqb]

DMR cap+ system using RAS or encryption?

So how can you tell if a dmr trunked system (cap+ in my case) is using such? I am getting a lot of "0" talkgroup and "0" user id showing up a lot, all with same cc and of course no audio. I also notice that the time slot keeps flipping back and both from 1 to 2 while its keyed up. Anyway all this happens whether the system is programmed in and scanning using id search mode or just using conventional search across the trunk freqs. However I do pick up an occasional conversation but very sparse at that. Should be a lot more traffic than that though and signal strength (reception) is not an issue.
So I didn't know if the 0-0 info was merely indicating telemetry data (it is a utility company) or something else.
Also--can such a system (site) support multiple color codes? I have noticed more than one color code. Didn't know the reasoning behind that.
Thanks a lot,
Sly

 

[RayAir]

Your best bet would be to use DSD+ to see what's going on.
My money says it's probably data being transmitted and not voice.

Not sure if the SDS has a built in tap where you could connect it to a PC running DSD.
That would yield a lot of info. RAS shouldn't prevent a scanner from receiving voice, but DSD would indicate RAS in the event window if the system is using it.

 

[vocoder]

I have a cap + system that is doing the exact same thing on my sds100's and 36's
Trying to figure out the best way to program it. Ive tried one frequency and trbo trunk without much improvement

73, john

 

[Forts]

Capacity Plus systems should be programmed with a system type of 'MotoTRBO'. Once you create the system, create a site... add your frequencies and make sure your LCN settings are correct (this is critical). I'm listening to a few Capacity+ systems in my area with no issue at all.

 

[vocoder]

Forts,

Does your cap + stop on a channel and often show a signal, but no voice? Just like the opening post describes? Trying to figure out if im missing voice traffic.
Thanks

 

[Forts]

Forts,

Does your cap + stop on a channel and often show a signal, but no voice? Just like the opening post describes? Trying to figure out if im missing voice traffic.
Thanks

Not that I've seen yet, no. I've had it running many times with a system radio beside it and it seems to keep up just fine.

 

[Ubbe]

Also--can such a system (site) support multiple color codes? I have noticed more than one color code. Didn't know the reasoning behind that.

Each transmitter/frequency can have its own color code, it is programmed as a fixed value in each basestation and its only purpose are to be used as a kind of squelch much like a CTCSS/DCS in analog channels to stop getting interference data from other channels and systems.

I notice that some sites use the same color code for all channels, which defeats its purpose of stopping getting bad data from another channel in the same site due to intermod and other RF problems. Ideally all channels in a site should have different color codes if you look at it from a technical point of view and if frequencies are shared with other systems within 30-40 miles they should not use the same color codes.

/Ubbe

 

[vocoder]

Im thinking the times when there is signal and no voice must be the rest channel sending data at intervals

 

[troymail]

Im thinking the times when there is signal and no voice must be the rest channel sending data at intervals

That should not be the case if programmed as a MotoTRBO system ... programmed as conventional - very likely, but not when programmed as a trunk system.

 

[Ubbe]

The scanner only stops on rest channel data if you are in conventional mode and not digital. If the scanner doesn't decode any voice grants data it will continue it's scanning cycle.

TG 0 and ID 0 are probably illegal values to use in a DMR system. I cannot program them in a DMR radio.
As I understand the scanner will drop its errorchecking of the received data whenever it thinks it is a RAS system. It's almost impossible to receive data over radio waves without getting errors if you don't use some sort of error recovery and you'll probably see a lot of errors in the data decode.

I wish Uniden could add some sort of indicator on the display when the scanner have switched over to RAS mode. It would help to trouble shoot if you knew that the scanner had left its error check mode and you have to accept that errors in the decode process will pop up.

/Ubbe