Trying To Decode A DMR TIII System with DSDplus 1p101

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KC0LOE

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I am trying to figure out and listen to a local 800Mhz DMR TIII system, that a local utility switched to about a year ago. I got DSDplus to start decoding the control channel, but all I am getting what I believe is errors. Is this because the signal I am getting is poor, or did I set something else wrong? I've included a screen shot of what I am getting on the roll of the control channel.

There is not much information for the system in the database https://www.radioreference.com/apps/db/?sid=9754 I am only about 7-8 miles from the Yankton site, the site I am trying to decode. I did find all the frequencies for the site in the FCC licenses.
 

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slicerwizard

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Yes, there are errors, but most messages are decoding properly. You haven't provided any information regarding your RX chain - no equipment description/location or screen shots, not even an RX audio waveform.
 

KC0LOE

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I am using two RTL-SDR Dongles, connected to two 800Mhz indoor Antennas. I seemed to get a better decode on it tonight with a lot fewer errors. I have also included a shot of the wave form.
 

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EarHoles

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Hey mate,
even thou im fairly new i noticed your reception is quite low,
could be affecting. i have attached mine,

also are you aware you are using a 3 year old version of DSD+?

good luck
 

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KC0LOE

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I see now that I am using an old version of DSDplus. I am using two mobile 800mhz antennas indoors. They worked well when I was monitoring my city PD's Provoice system, but that site is much closer to me (2 or 3 miles) across town. Since I got my BCD996P2, it takes care of the Provoice now.

I'm using a roof antenna connected to a Rat Shack FM trap and 4-port PCT drop amp for my two traditional scanners. I am going to order two f-sma adapters and connect the dongles to the amp/outside antenna, and will update my dsdplus with fast lane and try again.
 

fwradio

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You would be very well off springing for the FastLane version. It is a small donation to the cause and I have found it well worth every penny and more.
 

TheButcher

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Why run 2, 3 or 4 antennae guys ? F type connectors can be bought that pretty much attach to RG58C/U type coax. The RG-58C/U can be addapted to RG-213, or even better (at 800MHz), LMR400...

https://www.youtube.com/watch?v=uwKTluHE0yo


FL is a good investment. Much cheaper than a digital scanner or an RT. But us hammies are cheap!
 

TheButcher

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ps. The F type I am referring to is identical to the belling-lee types with a screw for the centre and compression cord restraint for the braid. These are not the 'twist on' type.
 

slicerwizard

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I am using two RTL-SDR Dongles, connected to two 800Mhz indoor Antennas. I seemed to get a better decode on it tonight with a lot fewer errors. I have also included a shot of the wave form.
What are all those spikes in the spectrum display? You seem to have some bad interference or overloading going on.
 

dave3825

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Why run 2, 3 or 4 antennae guys ? F type connectors can be bought that pretty much attach to RG58C/U type coax. The RG-58C/U can be addapted to RG-213, or even better (at 800MHz), LMR400...

https://www.youtube.com/watch?v=uwKTluHE0yo

In the video, the guy states that what makes the 4 way splitter digital, is the f type connectors. The f connectors make it digital.

Hmm, weren't f connectors invented in the early 50's buy a guy working for a cable tv company. Wasn't digital tv invented in the 90's?

Had to stop watching.
 
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