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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 02-01-2018, 1:20 PM
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Question DSD+ FL 2.xxx Very bad Provoice Decoding

What can I do to improve Provoice Decoding?
I attached the audio output file rename the .mp3.pdf to .mp3

unitrunker:
See attached images

Virtual ausio cable:
50% vol
48000hz
Mono



'''audio input device #3 (Line 9 (Virtual Audio Cable)) initialized
audio output device #4 (Line 1 (Virtual Audio Cable)) initialized

ProVoice decoding enabled

Mono audio decoding initiated; press Esc to exit...
Sync:+ProVoice VOICE e:Er10rFrEr
Sync:+ProVoice VOICE e:12Cr7r
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:ErDrFrEr
Sync:+ProVoice VOICE e:1
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:1
Sync:+ProVoice VOICE e:6rAr
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:1
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:141
Sync:+ProVoice VOICE e:12
Sync:+ProVoice VOICE e:31
Sync:+ProVoice VOICE e:1
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:1132
Sync:+ProVoice VOICE e:131
Sync:+ProVoice VOICE e:1312
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:11
Sync:+ProVoice VOICE e:FrErFrDr
Sync:+ProVoice VOICE e:124
Sync:+ProVoice VOICE e:14
Sync:+ProVoice VOICE erDr
Sync: no sync
Sync:+ProVoice VOICE erDrErEr
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:Fr10r
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:111
Sync:+ProVoice VOICE e:1Br9r
Sync:+ProVoice VOICE e:131
Sync:+ProVoice VOICE e:2
Sync:+ProVoice VOICE e:21
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:211
Sync:+ProVoice VOICE e:41
Sync:+ProVoice VOICE e:11
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:16r6r
Sync:+ProVoice VOICE e:32
Sync:+ProVoice VOICE e:4455
Sync:+ProVoice VOICE e:3143
Sync:+ProVoice VOICE e:3334
Sync:+ProVoice VOICE erErDrFr
Sync:+ProVoice VOICE e:3
Sync:+ProVoice VOICE e:6r58r1
Sync:+ProVoice VOICE e:8r9r22
Sync:+ProVoice VOICE e:8r8r58r
Sync:+ProVoice VOICE e:11Br4
Sync:+ProVoice VOICE e:Ar57r4
Sync:+ProVoice VOICE e:32ErFr
Sync: no sync
Sync:+ProVoice VOICE e:ArCr
Sync:+ProVoice VOICE e:7r334
Sync:+ProVoice VOICE e:8r7r
Sync:+ProVoice VOICE e:ArAr10rDr
Sync:+ProVoice VOICE e:8r7r
Sync:+ProVoice VOICE e:436r
Sync:+ProVoice VOICE e:7r7r
Sync:+ProVoice VOICE e:2141
Sync:+ProVoice VOICE e:8rBr32
Sync:+ProVoice VOICE e:6r48rAr
Sync:+ProVoice VOICE e:58r9r9r
Sync:+ProVoice VOICE e:8r8r37r
Sync:+ProVoice VOICE e:316r4
Sync:+ProVoice VOICE e:8rAr4
Sync:+ProVoice VOICE e:9r7r6r5
Sync:+ProVoice VOICE e:46rBr5
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:ErErFrCr
Sync:+ProVoice VOICE
Sync:+ProVoice VOICE e:Ar2
Sync:+ProVoice VOICE e:2ErEr
Sync: no sync
'''
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Attached Images
File Type: pdf 1591-1517509027_8.592125e+002.mp3.pdf (17.2 KB, 94 views)
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Old 02-01-2018, 2:19 PM
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How is your signal strength?
When I first started using DSD years ago I could not get a decent decode until I put up an outside antenna.
Where I am provoice is 860 mhz.
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Old 02-01-2018, 6:07 PM
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What version of Unitrunker are you running?
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Old 02-01-2018, 6:30 PM
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Unitrunker v2

and yes 800MHZ SID 623
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Old 02-01-2018, 9:40 PM
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Realized after my post that UT V2 does not decode Provoice, just P25. Yor dongles ppm is set to zero. What dongle are you using? Have you tried AFT ? Auto fine tune on the voice vfo. Have to played with the virtual cable audio levels? I need mine to be around 4 just to get started.
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Old 02-02-2018, 7:54 AM
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Hi Dave3825,
I am using the rtl-sdr.com v3 R820T2 RTL2832 dongles. So when I have measured the PPM it should be zero.
I have played around with turning automatic fine-tune on and off but I haven’t noticed a real big difference either way right now I was testing it with off .
As far as virtual audio cable goes I have it set at about 50% volume and I’ve tried playing with anywhere between 30% and 60% and about 50 seems to do the best.
Right now where I have everything it seems to be the decoding the best i’ve been able to get it to tweaking everything but I still get a lot of errors in the DSD window and it’s still pretty garbled.
longer transmissions like 11 to 20 second transmission seem to do a lot better than short two to eight second Transmissions
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Old 02-02-2018, 10:08 AM
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if the quality of the signal is not good when it enters your antenna, all the adjustments will not give you a good voice decode.
Try listening to the voice traffic prior to decoding. Listen for fading, crackles or static and any other noice that can interfere with a good quality decode.
I have issues with a cellphone tower 1/4 mile away that interferes with signals along with local power line noise. There is not much you can do beyond yagis, low loss coax and better receivers (except to move).

chris
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Old 02-02-2018, 10:55 AM
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Try eliminating some of the stuff along the way (UT and VAC). Use FMP24 and park on a voice channel and use that to pipe the audio over to DSD+ and see how the quality compares. If it's better, then you'll likely need to do some tweaking on the other setup. If it's the same or similar then you know you don't have an issue with UT etc.
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