DSDPlus DSD+ FL, working flawlessly so far, first time seeing this kind of MotoTRBO DMR signal, what is it?

Joined
Jul 28, 2019
Messages
3
Hi!

I have been playing with DSD+ FL and radio in general for some time, using my airspy or rtl dongle, very fun!! Listened to local construction workers and some hams experimenting, and I found some repeaters just spamming nothing ("Idle"). Then I found this on 450MHz and I can't wrap my head around what it is.

Here's what I know so far:
  • My antenna is a dipole tuned to the exact frequency and I'm 100% sure that there's no interference and the signal is good and not clipping; also gain and bandwith are properly adjusted.
  • It's a DMR MotoTRBO signal, 100%. Sounds exactly like it, decodes like it.
  • I managed to retrieve some of voice data, but I can't make out anything.
Activity update: Slot1=Group Voice Slot2=No Activity
+DMR slot1 BS DATA DCC=1 TLC ECC/RAS Enc GC End TG=1 RID=11101
+DMR slot2 BS DATA DCC=1 Idle
+DMR slot1 BS DATA DCC=1 TLC ECC/RAS Enc GC End TG=1 RID=11101
+DMR slot2 BS DATA DCC=1 Idle
Activity update: Slot1=Group Voice Slot2=No Activity
+DMR slot1 BS DATA DCC=1 PI Header ECC/RAS Alg=RC4 KID=3 MI=EBAA4E13 Tgt=1
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS VC6
Slot2: Enc TXI GC TG=474 RID=14100
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
Sync:+DMR
+DMR CACH ERR slot1 BS DATA DCC=1 Voice Hdr ERR15 ECC FAIL
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 PI Header ECC/RAS Alg=RC4 KID=2 MI=B898B682 Tgt=474
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS VOICE
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=1461]
00 10 60 0001DA 0005B5
000000000001000001100000000000000000000111011010000000000000010110110101011100100100000100001111
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=1461]
00 10 60 0001DA 0005B5
000000000001000001100000000000000000000111011010000000000000010110110101011100100100000100001111
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=1461]
00 10 60 0001DA 0005B5
000000000001000001100000000000000000000111011010000000000000010110110101011100100100000100001111
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 Voice Hdr ECC/RAS Enc TXI GC TG=474 RID=14100
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 Voice Hdr ECC/RAS Enc TXI GC TG=474 RID=14100
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 PI Header ECC/RAS Alg=RC4 KID=2 MI=5C23410E Tgt=474
Slot2: Enc TXI GC TG=474 RID=14100
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ERR4 ECC FAIL
Sync:+DMR
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 TLC ECC/RAS [FLCO=0 FID=10 v8=60 id1=474 id2=14100]
00 10 60 0001DA 003714
000000000001000001100000000000000000000111011010000000000011011100010100100010010001011010110010
Sync:+DMR
+DMR slot2 BS DATA DCC=1 Voice Hdr ECC/RAS Enc TXI GC TG=474 RID=1461
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 Voice Hdr ECC/RAS Enc TXI GC TG=474 RID=1461
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 PI Header ECC/RAS Alg=RC4 KID=2 MI=1EC58D16 Tgt=474
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 PI Header ECC/RAS Alg=RC4 KID=2 MI=1EC58D16 Tgt=474
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS VC6
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 Voice Hdr ECC/RAS Enc TXI GC TG=474 RID=1461
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Group Voice
+DMR slot2 BS DATA DCC=1 Voice Hdr ECC/RAS
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS VOICE
+DMR slot1 BS DATA DCC=1 Idle
Also recieved LRRP data which I succesfully viewed and that worked. So I'm confuesd. There's LRRP, there's data, but no voice. Why? Also, recieved some voice, but it's weird.
Null SLCO
+DMR slot2 BS DATA DCC=1 Data Header DPF=[2:UcData] Tgt=16448250 Src=129 Conf=0 SAP=[4:IP Data] Blocks=5 Pad=5 Last=0 Seq=0
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 Data Header DPF=[7:?]
+DMR slot1 BS DATA DCC=1 Idle
Null SLCO
+DMR slot2 BS DATA DCC=1 Data Header DPF=[13:SD-Def] Tgt=5990400 Src=882505 Conf=0 SAP=[5:ARP] Blocks=33 Format=??? PadBits=1
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 Data Header DPF=[8:?]
+DMR slot1 BS DATA DCC=1 Idle
Activity update: Slot1=No Activity Slot2=Indiv Data
+DMR slot2 BS DATA DCC=1 Data Header DPF=[6:?]
+DMR slot1 BS DATA DCC=1 Idle
+DMR slot2 BS DATA DCC=1 Data Header DPF=[3:ConfData] Tgt=5241732 Src=13378382 Conf=0 SAP=[6:?] Blocks=64 Pad=13 Last=0 Seq=7 S=1 N(S)=6
How the audio sounds: Weird audio DSD

P.S. There's more information I wasn't able to include in the post from the logs, due to 15000 character limit. I hope this will be enough info.
 

mtindor

OH/WV DB Admin
Database Admin
Joined
Dec 5, 2006
Messages
8,382
Location
Carroll Co OH / EN90LN
Hi!

I have been playing with DSD+ FL and radio in general for some time, using my airspy or rtl dongle, very fun!! Listened to local construction workers and some hams experimenting, and I found some repeaters just spamming nothing ("Idle"). Then I found this on 450MHz and I can't wrap my head around what it is.

Here's what I know so far:
  • My antenna is a dipole tuned to the exact frequency and I'm 100% sure that there's no interference and the signal is good and not clipping; also gain and bandwith are properly adjusted.
  • It's a DMR MotoTRBO signal, 100%. Sounds exactly like it, decodes like it.
  • I managed to retrieve some of voice data, but I can't make out anything.





Also recieved LRRP data which I succesfully viewed and that worked. So I'm confuesd. There's LRRP, there's data, but no voice. Why? Also, recieved some voice, but it's weird.


How the audio sounds: Weird audio DSD

P.S. There's more information I wasn't able to include in the post from the logs, due to 15000 character limit. I hope this will be enough info.
There is no voice because the voice is Encrypted : Alg=RC4 (RC4 encryption in use)

Mike
 
Joined
Jul 28, 2019
Messages
3
There is no voice because the voice is Encrypted : Alg=RC4 (RC4 encryption in use)

Mike
Hi Mike! Thank you so much for replying. Ah yes! I see now. I found this post too talking about that exact thing. DSD+ FastLane Decoding - ARS or some unknown kind of LRRP?

Oh I see! I suppose it's impossible to listen to it unless I have the key then, yes? I wonder now who's on there heh. I'm just confused how I was able to recieve some garbled audio from it.

What would you do next Mike, if you were in my shoes?

Big thanks again :) I appreciate your time.
 

Kazzaw

Member
Premium Subscriber
Joined
Aug 3, 2015
Messages
81
Location
South East QLD, Australia
What would you do next Mike, if you were in my shoes?
Nothing you can really do with it, in most places its illegal to attempt to decrypt such information.
I suppose it's impossible to listen to it unless I have the key then, yes?
Correct - Even with the key, DSDPlus doesn't have an option to add a key to decode the audio.

I'm just confused how I was able to recieve some garbled audio from it.
All encryption comes through as garbled audio, sometimes (settings dependent) DSDPlus lets it go through before blocking it.
 
Joined
Jul 28, 2019
Messages
3
Nothing you can really do with it, in most places its illegal to attempt to decrypt such information.


Correct - Even with the key, DSDPlus doesn't have an option to add a key to decode the audio.



All encryption comes through as garbled audio, sometimes (settings dependent) DSDPlus lets it go through before blocking it.
Oh man! Didn't know it was illegal. I figured it was the same thing as using DSD+ to decrypt DMR haha. Thanks a lot for the reply. This really helped me understand it further. I'll leave it at that! Private broadcast :p !
 

Kazzaw

Member
Premium Subscriber
Joined
Aug 3, 2015
Messages
81
Location
South East QLD, Australia
There is a lot of difference between decryption and decoding

Decoding is using DSD+ to decode the information sent in the radiowaves (the DMR sound you would hear if you just tuned an analog radio to the frequency)

Decryption is un-encrypting encrypted communications for the purpose of listening to the conversation.

Theres probably a better way to explain it somewhere
 
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