DSD Windows Port

[woodpecker]

Do you have an NFM mode, 15 kHz is quite a wide filter, 6 kHz would be plenty for a DMR signal. If they have privacy turned on (ie basic encryption) you won't be able to decode it.

[scancapecod]

@mig44n: The last picture in your post is an indication that you are trying to decode DMR in the wrong mode. I have seen that type of display in every instance when it is in the wrong polarity. If you switch polarity and then try to balance your audio input you should get some results.

[mig44n]

Mr woodpecker .. thank you for your reply > yes i have NFM and also tried 6 kHz in NFM but i think 15 khz in NFM give a more clear sound that what i think ...

thank you Mr scancapecod i will try again to reverse polarity by start the program dsd.exe -xr and i will post the result with pic ....

[mig44n]

i had start the program with dsd.exe -xr and the result are the same with little voice and so many unknown burst type i also tried to increase and decrease the volume of the input Mic with no luck ...
the picture show the operation >>

[woodpecker]

Originally Posted by scancapecod

@mig44n: The last picture in your post is an indication that you are trying to decode DMR in the wrong mode. I have seen that type of display in every instance when it is in the wrong polarity. If you switch polarity and then try to balance your audio input you should get some results.

He already said he had tried it inverted with -xr

[scancapecod]

Originally Posted by woodpecker

He already said he had tried it inverted with -xr

I'm aware of what he said. I'm not trying to incite an argument. What I'm trying to get at is that in probably 20 or so installations, the picture he shows above in every case indicates a signal that is being received in the wrong polarity.

Thanks.

[screenersam]

so how do I switch polarity, if that's the issue?

does anyone know a USB sound card that will work with this? I think my card is the problem here.

anyone know how I can find if my Privacy is turned on?
obviously I'm not that computer savvy.

[scancapecod]

The command dsd -fr should run MotoTrbo in + polarity. dsd -xr will run it in - polarity. If one polarity does not work the other almost certainly will if you don't have an encrypted signal and if you have the right balance of discriminator audio which almost certainly involves having a 10k ohm resistor on the tap.

I think a lot of people think that DSD will simply work "out of the box" and get frustrated when it doesn't. Well, it doesn't, but when you get it to the point of working (and you will with the encryption exception) you'll be very pleased with the results. There are so many variables involved, sound cards, input levels, etc. It just takes time. Stick with it, you've certainly got nothing to lose; as it stands now you can't listen to it anyway.

I don't have an answer for telling how Privacy/Encryption is turned on as I don't have any systems in my area (yet) using it.

[scannerfreak]

Originally Posted by screenersam

anyone know how I can find if my Privacy is turned on?

DMRDecode:

Java program to decode DMR

[inigo88]

His second screenshot (when he used "dsd.exe -xr") is decoding MotoTRBO (DMR) correctly. Those Unknown Burst Type 1111 and 1011 messages are not indicative of a bad decode, they are proprietary system messages used by the MotoTRBO trunking systems that are not part of the DMR standard. I believe the 1111 and 1011 messages are indicative of a Capacity Plus system, but I'd have to go back and check.

My three recommendations:

1.) Start the program with "dsd.exe -xr -fr" to tell it to invert the signal and only attempt to decode known DMR voice frames.

2.) Adjust your input levels. Anything from 5% to 20% decodes allright for me, but it likely varies widely based on soundcard.

3.) DSD is very sensitive to interference (much more so than DMRDecode). If you hear any static at all along with the digital signal, you will get crappy decodes. Try running the program again in a better location closer to the origin of the signal.

If none of that works, they likely have "Privacy" (Encryption) turned on and then you are out of luck.

[scancapecod]

So I'm not causing any confusion, I meant the first set of pics show incorrect polarity. For some reason I didn't see the second screenshot which is definitely in the correct polarity. So, my last post probably came across as misleading.

Another sign I've noticed with incorrect polarities is that the SLOT shows in all caps, but in lower case with the correct polarity.

@mig44n, I notice you're also referring to your "mic in" in your last post. Are you using a mic input instead of a line in? That could also be your source of grief.

Edit: I need to obviously pay closer attention to screenshots. I see that you ARE indeed using mic in, and it appears that you have the option to use Line In. Try Line in if you can.

[mig44n]

thank you all for your kindly AND Informative information ....
yes i have only mic in so i think it is the problem coz i tryed every thing with no luck
and also i have 10k ohm resistor on the tap ...
i dont have a computer with line in right now but i will try and tell what happened ...
again thank you all very much ...

[screenersam]

dupe post sorry

[screenersam]

Thanks all for the coaching. I got the tap and the program so hopefully I can get the rest done.
does the cable make a difference (stereo/mono?) (that's the 1/8 jack from tap to puter)

my puter has a 'line in' in the back but it's two holes. I put it in one and got a hammering, nothing on the other. would I need to use a stereo cable and split? (the two Line In ports are colored lime and blue/purple)
right now I'm trying a homemade cable; I might be able to switch polarity by changing the wiring? I had a guy hook up the tap for me and I wonder if he reversed the tap jack, I didn't have the instructions for that part.

system shows a bunch of =====R=====RM
mod: QPSK inlvl: 2% nac ECD src: 0 tag
duid 32 *unkn duid* sync: no sync

[mig44n]

ppl i used another pc with built in sound card and aline in input and i could hear some voices finally ....
but in the conferstion i hear one person and the other not understandbale voice why that ???
i think the sound card have abig imprtant ruel decoding is that right???
what about buying usb sound card ???
sorry for bad english ....

[screenersam]

well I downloaded the Irwin provoice version. now I get
'setting symbol rate to 9000/second'
'speech quality 10 waves/band'
sinc: -provoice inlvl 27% voice e:
and some =====RR
so I'm getting some voice but not intelligble. any suggestions what to fine tune? or sound card?

[scankid]

Originally Posted by binome

You need to set the command line options to tell the input and output sound interfaces to DSD to /dev/dsp normally with the -i and -o options.



I've recompiled a version enclosed that won't ask now, so if your lazy and want to decode P25,MOTOTRBO,X2-TDMA
you don't need to do anything and just click dsd.exe

dsdforwin v2 - Minus.com

-fi is nxdn or idas. I'm getting a - negative decoding instead of a + positive decoding , a garbled sound .any suggestions. do I have to switch the wires around on my disc tap.

[scankid]

my tap is working good , it decodes p25 excellent! I'm getting all positive decoding. but idas is still garbled. they probably are using a voice descrambler on there radio system. I'll kept trying .

[jhampton2000]

>but idas is still garbled
There are other posting in this thread (eg see n1das 01-16-2012) that also indicate that DSD does not decode idas.

[advancedcommunications]

I have dsdforwin v2 running in Windows XP, I have an Icom F1721 Mobile with discriminator tapped and with a 10k resistor inline, connected to line in of my pc, I hear NXDN traffic on the radio, and I have adjusted recording levels to all avail, but the dsd only shows

Digital Speech Decoder 1.4.1
mbelib version 1.2.3
Audio In/Out Device: /dev/dsp

I can unmute the playback of the line in and can hear just fine, does anyone have any suggestions?