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Voice/Control Channel Decoding Software - For discussion of software applications which decode digital voice formats and trunking control channels. Please use the HF Digital Signals forum for anything below 30MHz.

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Old 09-10-2017, 8:52 AM
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Question Strange DMR Channel with DSDPlus FastLane

Hi there all! Long time reader here; for years, and I learned a lot. Now I an facing a strange and interesting DMR channel which prompted me to post.

I am using the latest DSDPlus FastLane release and everything works fine decoding many DMR channels in my area and a P25 Simplex (I think) channel - but the P25 is for another post.

The DMR Channel in question is mainly data on DCC-1 and sometime Voice on DCC-5. It is strange because I cannot understand what kind of data is being sent. If it is some kind of telemetry or messaging then I am not interested at all, but if it is some kind of control channel then I am interested if I can understand the topografy of the network. Mainly there is data traffic, some time only voice, and sometimes data+voice. In the last scenario DSD+ goes mad and scrolls a lot of errors. No errors if it is only voice or only data. Voice decodes fine and clear - data scrolls without errors but I cannot understand what kind of data.

I've managed to record the raw input of DSD+ during an episode, which I uploaded to zippyshare @

Zippyshare.com - DSDPlus-Raw-Input_2017-09-10@151210.wav

Also I am attaching two screenshots. One of the signal on SDR# and the other of the DSD+ windows during the registration of the above audio file. On the second screenshot, the area with red rectangle on the DSD+ Event Log window is what it logs during the registration.

Is there anyone that can help me understand what kind of DMR Channel is this?

Thanks in advance,

Ben
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Old 09-12-2017, 6:52 PM
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Zippyshare has jumped the shark. Pops up all kinds of junk. Couldn't even get it to let me download that file.
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Old 09-12-2017, 8:17 PM
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Yep, @slicerwizard , just noticed today Zippy forces you to click endless times before letting you download the file.

Anyway, uploaded it to G-Drive:


https://drive.google.com/file/d/0B69...ew?usp=sharing


Thanks in advance!

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Originally Posted by slicerwizard View Post
Zippyshare has jumped the shark. Pops up all kinds of junk. Couldn't even get it to let me download that file.
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Old 09-13-2017, 9:40 AM
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Quote:
Originally Posted by BrinC View Post
The DMR Channel in question is mainly data on DCC-1 and sometime Voice on DCC-5.
Looks like two separate transmitters (repeaters) to me.


Quote:
It is strange because I cannot understand what kind of data is being sent. If it is some kind of telemetry or messaging then I am not interested at all, but if it is some kind of control channel then I am interested if I can understand the topografy of the network.
The DCC1 repeater seems to be sending automatic registration service (ARS) messages.

The DCC5 repeater is carrying voice traffic.


Quote:
Mainly there is data traffic, some time only voice, and sometimes data+voice. In the last scenario DSD+ goes mad and scrolls a lot of errors.
Not surprising, since the two repeaters are fighting each other.


Quote:
No errors if it is only voice or only data. Voice decodes fine and clear - data scrolls without errors but I cannot understand what kind of data.
Again, just some boring ARS data (based on the fact that the embedded port numbers are 0FA5 (4005), which is where ARS lives)
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