DSDPlus DSDPlus Fastlane single-dongle monitoring No audio

[jocam29594]

Hi all,

Firstly Im so new these issues. In despite of that I tried to solve problems. Screenshots seems that everthing is ok. But there is no audio.
I ask experienced members to write the inconsistencies they see and what I need to do

Yes I know, I may not be able to listen to encrypted channels but you can see in traffic that not all of them are encrypted. I also have this problem on Dsd, sdrtrunk, op25.
I have a second sdr device but I didn't want to cause two problems without fixing the problem with one.

Thanks for spending your precious time. TB2AGU 73

 

[cg]

looks like you are not on the control channel. It is not showing System ID or the control channel info in the Channel Activity window.

 

[jocam29594]

looks like you are not on the control channel. It is not showing System ID or the control channel info in the Channel Activity window.

Hi. Thanks for your rapid response.
If the whole problem was caused by the control channel, I will laugh at myself. ))

Unfortunately, there was no stable signal at this strength around 385 MHz. how far away control channel from these voice channels ? If it can be much further away I'll try to do it one by one.

Thank you again

 

[cg]

No idea what the range of the bands are where you are. In the US, that is the US Military and can be 380-400. Based on the channels in use, the base is 385 so try higher first.
Open FMPx and simply click on a higher frequency. Keep doing it and go up through 400 or so MHz. Look for a similar spike.

 

[jocam29594]

No idea what the range of the bands are where you are. In the US, that is the US Military and can be 380-400. Based on the channels in use, the base is 385 so try higher first.
Open FMPx and simply click on a higher frequency. Keep doing it and go up through 400 or so MHz. Look for a similar spike.

Public safety frequencies between 380mhz to 400mhz (in Turkey) . Also, between 380 390 is P 25 (interested area) and between 390 to 400 is DMR. So I understand that I have to find out the control channel between 380 and 390 because of p25 range. Please correct me if I'm wrong. If I go higher than 390, I enter the area of the DMR, which leads me to a wrong conclusion.

I wish there was guidance information in the radiofrequence database. I would have known better where to look

 

[cg]

It should only take a minute to go through the range. You have multiple signals in your screen shot but you are looking for something roughly the same strength as your voice channel signal.

If you look at the channels you have seen, the lowest one is 0-44 (385.28125). Using math, this shows 385.00000 as the base and a step of 6.25KHz, the other channels fit that. I would not expect to see anything below 385.00000 so start there and click the mouse a bit in front of the active frequency. I usually do 1 MHz if the band is not too busy.

A P25 control channel is a constant signal, you don't need voice activity to find it.

 

[jocam29594]

.
This is from sdrtrunk. As you described I think true channel is thatbut Im afraid I hear no voice
I will add detailed pics .

 

[slicerwizard]

Record some raw audio of the control channel and upload it somewhere.

 

[noamlivne]

Regarding DSDPlus:
Try to search also between 851 and 870 to see if you can catch more P25 control channels. Maybe there you will have more luck.
In addition, perhaps your Audio device is not working or not set for the DSDPlus? Check in the Output menu.
Another thing to check in the Control menu is that the role of the 1R is Combined CC/VC and not only CC.
By the way, if you are in Europe, perhaps what you think is DMR between 390 and 400 is really TETRA, because that is part of the frequency allocation of TETRA?

 

[merlin]

The way I find control channels is first using SDRsharper. slide through the band you se spikes come and go, those are voice/data channels. Steady consistent spikes, zoom in with the waterfall. P25 has a unique signature. Zoom out and slide to the channel offset you see a few spikes come and go.
Note the frequency of that steady spike and edit your FMP24 bat file with that frequency, Start fastlane with that.
Next step is execute the 1R bat file. (I have to move a panel out of the way to find it.)
If everything else is set right in those bat files, now you should get activity in the log window showing the site data.
If voice channels are in the clear, you should hear those.
Your screenshot looks like P25 CC centered, the spikes to the right likely voice channels.

 

[jocam29594]

Regarding DSDPlus:
Try to search also between 851 and 870 to see if you can catch more P25 control channels. Maybe there you will have more luck.
In addition, perhaps your Audio device is not working or not set for the DSDPlus? Check in the Output menu.
Another thing to check in the Control menu is that the role of the 1R is Combined CC/VC and not only CC.
By the way, if you are in Europe, perhaps what you think is DMR between 390 and 400 is really TETRA, because that is part of the frequency allocation of TETRA?

unfortunately, that range hasn’t used our national spectrum plan yet
I tried two different computer. So audio output is ok. Also I can hear analog output and some another digital voice.

yes. cc/vc is combined.

Im in Turkey. There is no tetra between 390 and 400. I see usually DMR BS, TIII. Tetra spectrum is between 415 and 430.

thank you for your response

 

[jocam29594]

The way I find control channels is first using SDRsharper. slide through the band you se spikes come and go, those are voice/data channels. Steady consistent spikes, zoom in with the waterfall. P25 has a unique signature. Zoom out and slide to the channel offset you see a few spikes come and go.
Note the frequency of that steady spike and edit your FMP24 bat file with that frequency, Start fastlane with that.
Next step is execute the 1R bat file. (I have to move a panel out of the way to find it.)
If everything else is set right in those bat files, now you should get activity in the log window showing the site data.
If voice channels are in the clear, you should hear those.
Your screenshot looks like P25 CC centered, the spikes to the right likely voice channels.

I got voice other frequencies. I already listened with my DMR handheld Ham and also dsd fastlane ( for ex I can hear 417.250 mhz I think it is not trunking so I can listen)
I dont understand everything seems to like ok! But i dont hear anything.

 

[slicerwizard]

Note the frequency of that steady spike and edit your FMP24 bat file with that frequency, Start fastlane with that.
Next step is execute the 1R bat file. (I have to move a panel out of the way to find it.)

Right, edit a batch file instead of just tuning FMP24 to the CC frequency. Edit a batch file instead of just using DSD+'s startup options and/or site loader functionality.

What do you do when you're in range of more than one trunking site? Keep editing a batch file??

 

[jocam29594]

Right, edit a batch file instead of just tuning FMP24 to the CC frequency. Edit a batch file instead of just using DSD+'s startup options and/or site loader functionality.

What do you do when you're in range of more than one trunking site? Keep editing a batch file??

Start CMD /c "DSDPlus -r1 -i20010 -fx -f1 -o1 -t -E -v4 -O nul"

Start CMD /c FMP24 -rc -i0 -o20010 -b12.5 -ffrequency -e0

This is last .bat that I find on net. and tried that but same....

 

[slicerwizard]

Again, record some raw audio of the control channel and upload it somewhere.

 

[Reconrider]

Start CMD /c "DSDPlus -r1 -i20010 -fx -f1 -o1 -t -E -v4 -O nul"

Start CMD /c FMP24 -rc -i0 -o20010 -b12.5 -ffrequency -e0

This is last .bat that I find on net. and tried that but same....

Are you willing to download a remote program where someone like myself can access your computer and get you some better help?
I haven't used teamviewer in awhile so it might actually work for me, but it's about the best of the best even using the free one.

Not sure if you have the permissions to DM anyone yet, but if you're able to send me a DM. If you can DM yet and have discord join the group in my sig

 

[jocam29594]

Again, record some raw audio of the control channel and upload it somewhere.

Ok. Finally added

wav: audio_385081250Hz_17-41-29_22-08-2021.wav

 

[jocam29594]

Are you willing to download a remote program where someone like myself can access your computer and get you some better help?
I haven't used teamviewer in awhile so it might actually work for me, but it's about the best of the best even using the free one.

Not sure if you have the permissions to DM anyone yet, but if you're able to send me a DM. If you can DM yet and have discord join the group in my sig

Thank you. Of course it could be As a Last solution.

 

[Reconrider]

Ok. Finally added

wav: audio_385081250Hz_17-41-29_22-08-2021.wav

Is this the p25 system? I would suggest trying this and seeing if you can hear person audio afterwards - https://prnt.sc/1qelo9f

Thank you. Of course it could be As a Last solution.

Yes as a last solution it'll work. I do think you have an issue decoding the system which would be the problem for that noise you keep hearing.

 

[jocam29594]

Is this the p25 system? I would suggest trying this and seeing if you can hear person audio afterwards - https://prnt.sc/1qelo9f


Yes as a last solution it'll work. I do think you have an issue decoding the system which would be the problem for that noise you keep hearing.

Opsss. I recorded this on sdr++ . I didnt know I record dsd+ I will try again.