Sample IQ File for P25p2?

N

NickFi

Member
Joined
Oct 5, 2023
Messages
33
Location
Sydney, Australia
Hi All,

I use DSDPlus with an RTL-SDR receiver and I am trying to demodulate P25p1 and P25p2 in Australia.
I just upgraded to DSDPlus v2.441.
I can demodulate P25p1, but I did not have success with P25p2.
I am still learning to operate the software.
From the log file I see that some P25p1 calls are encrypted and they are automatically muted.
Is there a way to unmute them? I know it is not possible to decrypt them, I just want to listen to them scrambled if I decide so.

Would anybody be willing to share an IQ file with an unencrypted P25p2 so I can check if I am able to demodulate it?
I also wonder if a P25p2 transmission that the system informs it is PSK modulated can be demodulated from an FM demodulated file, with a 40 kHz bandwidth? In that case, I wouldn't mind if I receive such a file as well.

Thanks,
Nicolae
 
Last edited:
mtindor

mtindor

OH/WV DB Admin
Database Admin
Joined
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Messages
11,234
Location
Carroll Co OH / EN90LN
NickFi said:
Hi All,

I use DSDPlus with an RTL-SDR receiver and I am trying to demodulate P25p1 and P25p2 in Australia.
I just upgraded to DSDPlus v2.441.
I can demodulate P25p1, but I did not have success with P25p2.
I am still learning to operate the software.
From the log file I see that some P25p1 calls are encrypted and they are automatically muted.
Is there a way to unmute them? I know it is not possible to decrypt them, I just want to listen to them scrambled if I decide so.

Would anybody be willing to share an IQ file with an unencrypted P25p2 so I can check if I am able to demodulate it?
I also wonder if a P25p2 transmission that the system informs it is PSK modulated can be demodulated from an FM demodulated file, with a 40 kHz bandwidth? In that case, I wouldn't mind if I receive such a file as well.

Thanks,
Nicolae
Click to expand...

If you are using DSDPlus v2.441, you should be able to easily demodulate P25 PII control channels and voice. That ability has been around in DSDPlus for some time. Perhaps the bigger question is what are you using for input?

FMP24 (RTL dongle)
FMPA (Airspy)
FMPP (RSP)
audio input from some other source like from a discriminator tapped scanner or from SDR# or SDR++

?

----------------------------------

From the menu system enable:

CONTROL --> Voice/Data Call Following
CONTROL --> Encrypted Voice Following --> Full Following

That should allow you to track / listen to encrypted voice calls

Mike
 
N

NickFi

Member
Joined
Oct 5, 2023
Messages
33
Location
Sydney, Australia
Hi Mike,
I am using one RTL-SDR v4 dongle. I first call FMP24-CC batch file, which contains the command "FMP24 -rc -i1 -o20001 -P0.0 -f417.0625". Then I call the batch file 1R.bat, which contains "DSDPlus -r1 -T -E -Pmp3 -i20001 >> 1R-log.txt".
The Control > Voice/Data call following is ticked.
I've done what you said and now when the receiver finds a P25p2 transmission, it logs the content below. However, I cannot hear any voice (perhaps this is a data transmission)?
Is there a way to filter just the P25p2 transmissions? The large majority I come across are P25p1.


2023.11.18 10:35:22 Sync:+P25p2 Sync: no sync
2023.11.18 10:35:23 FM demodulated P25p2 PSK signal detected; forcing P25p2 PSK demodulation
2023.11.18 10:35:26 Sync:+P25p2 Sync: no sync
2023.11.18 10:35:31 FM demodulated P25p2 PSK signal detected; forcing P25p2 PSK demodulation
2023.11.18 10:35:32 Sync:+P25p2 Bad DUID
2023.11.18 10:35:32 Sync:+P25p2 Sync: no sync
2023.11.18 10:35:32 FM demodulated P25p2 PSK signal detected; forcing P25p2 PSK demodulation
2023.11.18 10:35:32 Sync:+P25p2 DUID Ten Raw: 37441712104E25E5C4503674543CF5D7A99BF63B5B7C5A6775D13232AE6C3716AE4F982FFFCE09
2023.11.18 10:35:33 Bad DUID
2023.11.18 10:35:33 Sync: no sync
2023.11.18 10:35:34 Sync:+P25p2 Bad DUID
2023.11.18 10:35:34 Sync:+P25p2 SACCH w/sc Data Not Available
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 DUID Ten Raw: CF6DC42A38FC71699761BDF69775A34200F6063E6527461C3C9E30F941CB28A6F0C637BB64A6E3
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 SACCH w/sc Data Not Available
2023.11.18 10:35:34 SACCH w/sc Data Not Available
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 DUID Ten Raw: 8D6E81ED42C7050C4BC6B7DE7DF9349D8EB0103FA5086D57A9596F8259B5F9B5949168CFAB2112
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:34 Bad DUID
2023.11.18 10:35:35 Bad DUID
2023.11.18 10:35:35 SACCH w/sc Data Not Available
2023.11.18 10:35:35 SACCH w/sc Data Not Available
2023.11.18 10:35:35 Bad DUID
2023.11.18 10:35:35 Bad DUID
2023.11.18 10:35:35 Bad DUID
2023.11.18 10:35:35 Bad DUID
2023.11.18 10:35:35 Bad DUID
2023.11.18 10:35:35 DUID Ten Raw: 5CAC89CBE904BCDD9630ACF57A46EC5822F9708617A5B9161E37754CEA0305523B48DDC6F7EE19
2023.11.18 10:35:35 DUID Ten Raw: D0639162E9473B1466523E0440DABA4D98F8A2E69F363899E6DD8EC14BAEB20A3EA5AE95918612

I've been using the software and receiver for a few weeks now. I came across P25p2 many times and I could never decode voice from it. I don't know if in Australia and on this frequency range they use unencrypted voice.

Thanks,
Nicolae
 
R

ronenp

Member
Joined
May 8, 2002
Messages
595
First find the control channel and then monitor it you will get a lot of info from it but the channel you have seen is not a control channel
 
N

NickFi

Member
Joined
Oct 5, 2023
Messages
33
Location
Sydney, Australia
Most of the time I selected Combined CC/VC Monitor. I also tried with only CC and only VC. I will switch to CC for a while.
I think that today I could hear P25p2 calls, but they look different than P25p1.
For P25p1 they are clearly marked in Sync, as below, while for P25p2, it seems there is some other information listed.

VA=0011
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC [E] LC_GRP_V_CH_USR PRI4 Tgt=10328 Src=NONE
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC LC_ADJ_STS_BCST LRA=0 SysID=2D1 RFSS=4 SID=12 Ch=419.025 SSC=70
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC [E] LC_GRP_V_CH_USR PRI4 Tgt=10328 Src=NONE
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC Channel release
2023.11.18 19:07:32 Sync: no sync
2023.11.18 19:07:32 Sync:+P25p1 NAC:2DC TSDU RFSS_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=50 CC=417.5125 SC=70
2023.11.18 19:07:32 SN-DATA_CHN_ANN_EXP DSO=00 TXch=none RXch=none DAC=0001
2023.11.18 19:07:32 ERR1 ADJ_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=25 CC=416.5125 SC=70 CFVA=3: Networked
2023.11.18 19:07:32 Sync:+P25p1 NAC:2DC TSDU NET_STS_BCST WACN ID=BEE00 SysID=2D1 LRA=0 CC=417.5125 SC=70

In the image below, I selected Control > CC Monitor and I still get those "Raw" lines of data.

DSDPlus_ControlChannel_Monitoring.jpg


I captured some other info, which I present below. Is this content supposed to help me figure out about the P25p2 transmission, or do I have to look somewhere else?

2023.11.18 19:18:28 Sync: no sync
2023.11.18 19:18:28 Sync:+P25p2 Bad DUID
2023.11.18 19:18:29 FM demodulated P25p2 PSK signal detected; forcing P25p2 PSK demodulation
2023.11.18 19:18:29 Sync: no sync
2023.11.18 19:18:32 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:32 (F7S2-2V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F9S2-4V)
2023.11.18 19:18:32 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=10328 RID=2315361
2023.11.18 19:18:32 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=80 CC=4-1050 SC=70 CFVA=3: Networked
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F1S2-4V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F3S2-4V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F5S2-4V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F7S2-2V) ES: MI:000000000000000000 KID: 0000 (0) AlgID: 80 - CLEAR
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F9S2-4V)
2023.11.18 19:18:32 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:32 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=10328 RID=2315361
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 Bad Frame Data
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:35 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:35 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:35 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 Bad Frame Data
2023.11.18 19:18:35 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=130 CC=4-1050 SC=70 CFVA=3: Networked
2023.11.18 19:18:35 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 Bad DUID
2023.11.18 19:18:36 Sync: no sync

I also get a lot of errors in another window. Are these errors normal or something is not right?

r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
 
Last edited:
mtindor

mtindor

OH/WV DB Admin
Database Admin
Joined
Dec 5, 2006
Messages
11,234
Location
Carroll Co OH / EN90LN
NickFi said:
Most of the time I selected Combined CC/VC Monitor. I also tried with only CC and only VC. I will switch to CC for a while.
I think that today I could hear P25p2 calls, but they look different than P25p1.
For P25p1 they are clearly marked in Sync, as below, while for P25p2, it seems there is some other information listed.

VA=0011
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC [E] LC_GRP_V_CH_USR PRI4 Tgt=10328 Src=NONE
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC LC_ADJ_STS_BCST LRA=0 SysID=2D1 RFSS=4 SID=12 Ch=419.025 SSC=70
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC [E] LC_GRP_V_CH_USR PRI4 Tgt=10328 Src=NONE
2023.11.18 19:07:31 Sync:+P25p1 NAC:2DC TDULC Channel release
2023.11.18 19:07:32 Sync: no sync
2023.11.18 19:07:32 Sync:+P25p1 NAC:2DC TSDU RFSS_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=50 CC=417.5125 SC=70
2023.11.18 19:07:32 SN-DATA_CHN_ANN_EXP DSO=00 TXch=none RXch=none DAC=0001
2023.11.18 19:07:32 ERR1 ADJ_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=25 CC=416.5125 SC=70 CFVA=3: Networked
2023.11.18 19:07:32 Sync:+P25p1 NAC:2DC TSDU NET_STS_BCST WACN ID=BEE00 SysID=2D1 LRA=0 CC=417.5125 SC=70

In the image below, I selected Control > CC Monitor and I still get those "Raw" lines of data.

View attachment 151468


I captured some other info, which I present below. Is this content supposed to help me figure out about the P25p2 transmission, or do I have to look somewhere else?

2023.11.18 19:18:28 Sync: no sync
2023.11.18 19:18:28 Sync:+P25p2 Bad DUID
2023.11.18 19:18:29 FM demodulated P25p2 PSK signal detected; forcing P25p2 PSK demodulation
2023.11.18 19:18:29 Sync: no sync
2023.11.18 19:18:32 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:32 (F7S2-2V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F9S2-4V)
2023.11.18 19:18:32 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=10328 RID=2315361
2023.11.18 19:18:32 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=80 CC=4-1050 SC=70 CFVA=3: Networked
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F1S2-4V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F3S2-4V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F5S2-4V)
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F7S2-2V) ES: MI:000000000000000000 KID: 0000 (0) AlgID: 80 - CLEAR
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 (F9S2-4V)
2023.11.18 19:18:32 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:32 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=10328 RID=2315361
2023.11.18 19:18:32 MAC_IDLE Null Information
2023.11.18 19:18:32 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 Bad Frame Data
2023.11.18 19:18:33 MAC_IDLE Null Information
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:33 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 Bad Frame Data
2023.11.18 19:18:34 MAC_IDLE Null Information
2023.11.18 19:18:34 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:35 MAC_HANGTIME Group Voice Channel User Slot#2 PRI4 TG=10328 RID=0
2023.11.18 19:18:35 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 19:18:35 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 Bad Frame Data
2023.11.18 19:18:35 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=130 CC=4-1050 SC=70 CFVA=3: Networked
2023.11.18 19:18:35 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 MAC_END_PTT DCC=2D4 Tgt=10328 Src=16777215
2023.11.18 19:18:35 Sync:+P25p2 MAC_IDLE Null Information
2023.11.18 19:18:35 Bad DUID
2023.11.18 19:18:36 Sync: no sync

I also get a lot of errors in another window. Are these errors normal or something is not right?

r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=17 len=1
r82xx_set_freq: failed=-9
Click to expand...

What is being suggested by others is that you are never monitoring the CC. Just selecting Combined CC/VC monitor doesn't mean anything unless you actually find the active control channel and park on it. You need to look for a 24/7 signal that is the control channel for that particular site that you are monitoring. And according to what you are showing in the voice channel logs, the system is:

www.radioreference.com

NSW Public Safety Network Trunking System, NSW Statewide and ACT, Multi-State

NSW Public Safety Network Trunking System Profile
www.radioreference.com

1 (1)050 (32)Crown Castle - BDA HostSydney Outer (SO), NSW416.2625c416.5125416.7625417.0125417.2625417.5125c

That looks to be the site you are monitoring, but you are monitoring the voice channels. Find the 24/7 active channel amongst all of those freqs above (will likely be 416.2625 if it isn't 417.5125). Once you are sitting on the CC (control channel), when in "Combined CC/VC Monitor" mode, it'll switch to the voice channels and back automaticcally, if you don't have the talkgroups locked out and if the talkgroups aren't encrypted.

Mike
 
N

NickFi

Member
Joined
Oct 5, 2023
Messages
33
Location
Sydney, Australia
Thank you very much Mike. It appears the Control Channel is on 417.5125. I switched to CC/VC Monitor mode and I can hear various parties discussing. I also listened in the past on this frequency, but I had no idea it is a control channel. Checking the link you provided, I can recognise the "TG=10328" and I got to this link: Sydney - West Operations/New South Wales Ambulance Service - NSWAS Group Calls Live which provides further details.

Your link NSW Public Safety Network Trunking System, NSW Statewide and ACT, Multi-State indicates that the system type is P25p2, yet my log indicates for most, if not all calls the Sync as P25p1. So what is the deal, are these calls P25p1 or P25p2? If they are P25p1 as I suspect, then how can I identify which ones aee P25p2?


1700310293285.png

As per below, the Sync is indicating +P25p1 and this makes me believe all these calls I see here are P25p1.

1700310468970.png
Checking the log file that was saved to file, I see sometimes entries like below, but they are rare. As I was saying, I am interested to record an IQ file only for a P25p2 call. Is there a way I can do it?

2023.11.18 20:52:04 Sync:+P25p2 Bad DUID
2023.11.18 20:52:04 Sync:+P25p2 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=130 CC=4-1050 SC=70 CFVA=3: Networked
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=20254 RID=0
2023.11.18 20:52:04 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 MAC_IDLE Null Information
2023.11.18 20:52:04 (F9S2-4V)
2023.11.18 20:52:04 Bad DUID
2023.11.18 20:52:04 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 (F1S2-4V)
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 (F3S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F5S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F7S2-2V) ES: MI:000000000000000000 KID: 0000 (0) AlgID: 80 - CLEAR
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F9S2-4V)
2023.11.18 20:52:05 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=20254 RID=2065192
2023.11.18 20:52:05 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=12 CC=4-1048 SC=70 CFVA=3: Networked
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F1S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F3S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F5S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F7S2-2V) ES: MI:000000000000000000 KID: 0000 (0) AlgID: 80 - CLEAR
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F9S2-4V)
2023.11.18 20:52:05 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=20254 RID=2065192
2023.11.18 20:52:05 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=75 CC=5-388 SC=70 CFVA=3: Networked
2023.11.18 20:52:05 Bad Frame Data

At times the log is very actively populating, but there is no voice communication. Why is that? Here is an example below.

2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU IDEN_UP_TDMA ID=11 Base=459.99375 Offset=-9.5 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 SYNC_BCST US=0 IST=1 MMU=0 MC=0 VL=1 LTO=+10h 2023/11/18 12:44 uSlot=2340
2023.11.18 23:44:18 ERR1 SCCB RFSS=1 Site=50 [ch=416.2625 SSC=04] [ch=416.2625 SSC=04]
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU Opcode= 9 MFID=90 09 90 14 00 00 00 00 00 00 00
2023.11.18 23:44:18 IDEN_UP ID=0 Base=851.00625 Offset=-45 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 SN-DATA_CHN_ANN_EXP DSO=00 TXch=none RXch=none DAC=0001
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU RFSS_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=50 CC=417.5125 SC=70
2023.11.18 23:44:18 NET_STS_BCST WACN ID=BEE00 SysID=2D1 LRA=0 CC=417.5125 SC=70
2023.11.18 23:44:18 Opcode= 5 MFID=90 85 90 40 40 C0 00 00 00 08 00
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU IDEN_UP ID=1 Base=762.00625 Offset=+30 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 Opcode=22 MFID=90 16 90 42 3F FF FF FF FF 00 00
2023.11.18 23:44:18 IDEN_UP_TDMA ID=2 Base=851.0125 Offset=-45 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU ADJ_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=2 CC=416.8875 SC=70 CFVA=3: Networked
2023.11.18 23:44:18 IDEN_UP_TDMA ID=3 Base=762.00625 Offset=+30 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 IDEN_UP_VU ID=4 Base=412.475 Offset=-9.45 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU IDEN_UP_VU ID=5 Base=420. Offset=+5.2 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 SYNC_BCST US=0 IST=1 MMU=0 MC=0 VL=1 LTO=+10h 2023/11/18 12:44 uSlot=2390
2023.11.18 23:44:18 SCCB RFSS=1 Site=50 [ch=416.2625 SSC=04] [ch=416.2625 SSC=04]
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU Opcode= 9 MFID=90 09 90 12 C0 00 00 00 00 00 00
2023.11.18 23:44:18 IDEN_UP_TDMA ID=6 Base=412.475 Offset=-9.45 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 SN-DATA_CHN_ANN_EXP DSO=00 TXch=none RXch=none DAC=0001
2023.11.18 23:44:19 Sync:+P25p1 NAC:2DC TSDU RFSS_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=50 CC=417.5125 SC=70
2023.11.18 23:44:19 NET_STS_BCST WACN ID=BEE00 SysID=2D1 LRA=0 CC=417.5125 SC=70
2023.11.18 23:44:19 MOT_BSI_GRANT Null BSI ch=417.5125
 
mtindor

mtindor

OH/WV DB Admin
Database Admin
Joined
Dec 5, 2006
Messages
11,234
Location
Carroll Co OH / EN90LN
NickFi said:
Thank you very much Mike. It appears the Control Channel is on 417.5125. I switched to CC/VC Monitor mode and I can hear various parties discussing. I also listened in the past on this frequency, but I had no idea it is a control channel. Checking the link you provided, I can recognise the "TG=10328" and I got to this link: Sydney - West Operations/New South Wales Ambulance Service - NSWAS Group Calls Live which provides further details.

Your link NSW Public Safety Network Trunking System, NSW Statewide and ACT, Multi-State indicates that the system type is P25p2, yet my log indicates for most, if not all calls the Sync as P25p1. So what is the deal, are these calls P25p1 or P25p2? If they are P25p1 as I suspect, then how can I identify which ones aee P25p2?


View attachment 151470

As per below, the Sync is indicating +P25p1 and this makes me believe all these calls I see here are P25p1.

View attachment 151471
Checking the log file that was saved to file, I see sometimes entries like below, but they are rare. As I was saying, I am interested to record an IQ file only for a P25p2 call. Is there a way I can do it?

2023.11.18 20:52:04 Sync:+P25p2 Bad DUID
2023.11.18 20:52:04 Sync:+P25p2 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=130 CC=4-1050 SC=70 CFVA=3: Networked
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=20254 RID=0
2023.11.18 20:52:04 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=87 TXCC=4-1580 RXCC=4-2412 SC=70 CFVA=3: Networked
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 MAC_IDLE Null Information
2023.11.18 20:52:04 (F9S2-4V)
2023.11.18 20:52:04 Bad DUID
2023.11.18 20:52:04 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=8 TXCC=4-1584 RXCC=4-2416 SC=70 CFVA=3: Networked
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 (F1S2-4V)
2023.11.18 20:52:04 Bad Frame Data
2023.11.18 20:52:04 (F3S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F5S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F7S2-2V) ES: MI:000000000000000000 KID: 0000 (0) AlgID: 80 - CLEAR
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F9S2-4V)
2023.11.18 20:52:05 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=20254 RID=2065192
2023.11.18 20:52:05 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=4 Site=12 CC=4-1048 SC=70 CFVA=3: Networked
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F1S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F3S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F5S2-4V)
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F7S2-2V) ES: MI:000000000000000000 KID: 0000 (0) AlgID: 80 - CLEAR
2023.11.18 20:52:05 Bad Frame Data
2023.11.18 20:52:05 (F9S2-4V)
2023.11.18 20:52:05 MAC_ACTIVE Group Voice Channel User Slot#2 PRI4 TG=20254 RID=2065192
2023.11.18 20:52:05 MAC_IDLE Adjacent Status Broadcast SysID=2D1 LRA=0 RFSS=1 Site=75 CC=5-388 SC=70 CFVA=3: Networked
2023.11.18 20:52:05 Bad Frame Data

At times the log is very actively populating, but there is no voice communication. Why is that? Here is an example below.

2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU IDEN_UP_TDMA ID=11 Base=459.99375 Offset=-9.5 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 SYNC_BCST US=0 IST=1 MMU=0 MC=0 VL=1 LTO=+10h 2023/11/18 12:44 uSlot=2340
2023.11.18 23:44:18 ERR1 SCCB RFSS=1 Site=50 [ch=416.2625 SSC=04] [ch=416.2625 SSC=04]
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU Opcode= 9 MFID=90 09 90 14 00 00 00 00 00 00 00
2023.11.18 23:44:18 IDEN_UP ID=0 Base=851.00625 Offset=-45 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 SN-DATA_CHN_ANN_EXP DSO=00 TXch=none RXch=none DAC=0001
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU RFSS_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=50 CC=417.5125 SC=70
2023.11.18 23:44:18 NET_STS_BCST WACN ID=BEE00 SysID=2D1 LRA=0 CC=417.5125 SC=70
2023.11.18 23:44:18 Opcode= 5 MFID=90 85 90 40 40 C0 00 00 00 08 00
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU IDEN_UP ID=1 Base=762.00625 Offset=+30 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 Opcode=22 MFID=90 16 90 42 3F FF FF FF FF 00 00
2023.11.18 23:44:18 IDEN_UP_TDMA ID=2 Base=851.0125 Offset=-45 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU ADJ_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=2 CC=416.8875 SC=70 CFVA=3: Networked
2023.11.18 23:44:18 IDEN_UP_TDMA ID=3 Base=762.00625 Offset=+30 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 IDEN_UP_VU ID=4 Base=412.475 Offset=-9.45 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU IDEN_UP_VU ID=5 Base=420. Offset=+5.2 Spacing=6.25 BW=12.5
2023.11.18 23:44:18 SYNC_BCST US=0 IST=1 MMU=0 MC=0 VL=1 LTO=+10h 2023/11/18 12:44 uSlot=2390
2023.11.18 23:44:18 SCCB RFSS=1 Site=50 [ch=416.2625 SSC=04] [ch=416.2625 SSC=04]
2023.11.18 23:44:18 Sync:+P25p1 NAC:2DC TSDU Opcode= 9 MFID=90 09 90 12 C0 00 00 00 00 00 00
2023.11.18 23:44:18 IDEN_UP_TDMA ID=6 Base=412.475 Offset=-9.45 Spacing=12.5 BW=12.5 Slots=2
2023.11.18 23:44:18 SN-DATA_CHN_ANN_EXP DSO=00 TXch=none RXch=none DAC=0001
2023.11.18 23:44:19 Sync:+P25p1 NAC:2DC TSDU RFSS_STS_BCST SysID=2D1 LRA=0 RFSS=1 Site=50 CC=417.5125 SC=70
2023.11.18 23:44:19 NET_STS_BCST WACN ID=BEE00 SysID=2D1 LRA=0 CC=417.5125 SC=70
2023.11.18 23:44:19 MOT_BSI_GRANT Null BSI ch=417.5125
Click to expand...

The last part of the log that you mentioned, that is populating so frequently, is when you are sitting on the CC and is predominantly CC channel data. It repeats itself very regularly. I don't know how many times per minute, but many many times per minute. Even if the whole system is completely idle, the log will fill up with the same exact control channel traffic that basically provides information about the characteristics of the system -- WACN/SysID/RFFS-Site, system loading, peers, system or site bandplan, etc. It just repeats over and over again 24/7/365. Interspersed between all of that is information any time a radio registers, or joins a talkgroup, or leaves the system, or a group / private call, data call, etc occurs. So monitoring the control channel and logging that data is always going to produce a large volume of data, a large chunk of it repeating.

How to record only P25 P2 traffic? Well, you'd first need to determine which talkgroups are TDMA. Then you'd want to lock out all non-TDMA talkgroups.

P25 control channels are [almost] always P25 Phase I. So when you are parked on the CC and see the Sync P25p1 message, it's because it's an FDMA (not TDMA) control channel. Very few systems exist that actually use a TDMA control channel.

And, a system can advertise itself as P25 PHase II capable / ready but never have one iota of Phase II traffic on it. Here in Ohio our statewide system is such a system. Phase II capable, but no Phase II TDMA activity whatsoever.

In the Channel Activity window you can tell if/when a TDMA call is occurring, because the frequencies will split:

4##.####-1 - indicating the first timeslot on the TDMA channel
4##.####-2 - indicating the second timeslot on the TDMA channel

BTW, if you see "TDMA" in the Group call, then it is a Phase II voice call. DSDPlus will add TDMA (if you have that option selected in the menu) to the group call information.

If you are going to post a ton of screenshots, you should add the pictures as attachments rather than embedding them. embedded ones are often diffiicult for old guys like me to read. Being able to click on an attachment allows one to open up a picture and view it in full resolution.
 
mtindor

mtindor

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And you keep asking for a sample P25 Phase II IQ file. I don't think DSDPlus will produce an IQ file. It can produce a .WAV file of a raw recording. Read the TXT files included in the distribution. You can enable/disable raw audio recording from the menu system, under the INPUT menu. You can start / stop the raw source recording -- it'll save it to a file. If you want I/Q, you'll have to use some other program to capture it.
 
N

NickFi

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mtindor said:
And you keep asking for a sample P25 Phase II IQ file. I don't think DSDPlus will produce an IQ file. It can produce a .WAV file of a raw recording. Read the TXT files included in the distribution. You can enable/disable raw audio recording from the menu system, under the INPUT menu. You can start / stop the raw source recording -- it'll save it to a file. If you want I/Q, you'll have to use some other program to capture it.
Click to expand...
Thank you Mike, but it seems that at least the latest version of DSDPlus (v2.441) can and does record both IQ and FM files. I don't know if the feature exists in older versions since I just started with this activity. In the FMP24 window, if you press "R" or "r", it will start recording simultaneously IQ files and FM files. I believe the FM files are the FM demodulated audio files. The IQ files can grow very quickly - I already saved many such files yesterday.
I will also attach the files in future posts, rather than embeding them. Thanks for pointing out that to me. I also found evidence of TDMA records, with entries, like in the attachment. Now I should be able to record my own IQ, FM and WAV files.
 

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N

NickFi

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dave3825 said:
In both images the gain is set to the max will bring in a ton of noise. What is the antenna set up?

View attachment 151507

View attachment 151508
Click to expand...
I threw two lengths of wire on two different trees and I brought them over indoors, then I connected them trough a few meters of thin 50 ohm coax cable to the receiver input. The setup works very well :) I am waiting for some RG400 cable that I purchased and I will look into making a proper antenna.
I am also interested in the ham radio bands from 3.5 MHz and above, so I may have to make two different types of antennas and maybe combine them through a diplexer, I am not really sure how to do it. Or maybe to switch them through an RF relay, where they meet the coax cable.
Thanks for pointing out the gain is too large. I already tried to press 'g' key to lower the gain in the FMP24 window. But when I do that, the window title shows "Error" and raises an audio error every second or so. I have to restart the software to fix it. I added in the batch file FMP24-CC.bat the option -g20 and now the gain is set to 19.7 (and the signal is too weak now - I changed to -g40 for a 40 dB gain).
 
Last edited:
dave3825

dave3825

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NickFi said:
I am also interested in the ham radio bands from 3.5 MHz and above, so I may have to make two different types of antennas and maybe combine them through a diplexer, I am not really sure how to do it.
Click to expand...
Pretty easy to accomplish. If you're looking for something for 1 - 30mhz, and then 49mhz to 470, then something like this would work as long as you have antennas for 1-30 and 49 to 470.

www.dxengineering.com

Comet Antennas CF-360B Comet Duplexers | DX Engineering

Free Shipping - Comet Duplexers with qualifying orders of $99. Shop Duplexers and Triplexers at DX Engineering.
www.dxengineering.com www.dxengineering.com


There are also triplexers out there for 3 bands.


NickFi said:
I already tried to press 'g' key to lower the gain in the FMP24 window. But when I do that, the window title shows "Error" and raises an audio error every second or so. I have to restart the software to fix it.
Click to expand...


Gain can be set two ways. Either in the bat file using -g<num> RF gain (dB) [max]
Can also be adjusted while in FMP24 g/G adjust RF gain


I just focused in every window available including the packet data window, and the only window that either g or G did anything in was FMP24. I could not replicate any error. I would suggest maybe going to the Misc tab and downloading the newest base files.
 

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N

NickFi

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dave3825 said:
Pretty easy to accomplish. If you're looking for something for 1 - 30mhz, and then 49mhz to 470, then something like this would work as long as you have antennas for 1-30 and 49 to 470.

www.dxengineering.com

Comet Antennas CF-360B Comet Duplexers | DX Engineering

Free Shipping - Comet Duplexers with qualifying orders of $99. Shop Duplexers and Triplexers at DX Engineering.
www.dxengineering.com www.dxengineering.com


There are also triplexers out there for 3 bands.





Gain can be set two ways. Either in the bat file using -g<num> RF gain (dB) [max]
Can also be adjusted while in FMP24 g/G adjust RF gain


I just focused in every window available including the packet data window, and the only window that either g or G did anything in was FMP24. I could not replicate any error. I would suggest maybe going to the Misc tab and downloading the newest base files.
Click to expand...
Thank you Dave for the info and for the link to the duplexer. I will try to make a duplexer myself, I have access to test and measurement equipment and it will be fun to see if I succeed. The duplexer in the link has very good characteristics, only 0.2 dB loss in the bands and 45 dB of isolation. I am not going to transmit, so I can relax these specs. Besides, I am going to use different connector types. I will try downloading tonight the newest base files and report if it fixed the gain problem. I am using RTL-SDR v4, I don't know if this matters.
 
dave3825

dave3825

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NickFi said:
I just upgraded to DSDPlus v2.441.
I can demodulate P25p1, but I did not have success with P25p2.
Click to expand...


NickFi said:
I will try downloading tonight the newest base files and report if it fixed the gain problem. I am using RTL-SDR v4, I don't know if this matters.
Click to expand...
Since you mentioned V4, were you able to decode phase 2 before updating to 2.441? And prior to having a V4 dongle, were you able to decode phase 2?
 
N

NickFi

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dave3825 said:
Since you mentioned V4, were you able to decode phase 2 before updating to 2.441? And prior to having a V4 dongle, were you able to decode phase 2?
Click to expand...
Hi Dave, until I posted on this forum a few days ago, I didn't know what I have to do to decode P25p2. Now that it is clear, I could use a previous version to see if it still works. I don't have too many older versions, because I only joined the Fast Lane in October.
I have two dongles, one is RTL-SDR v4 and the other one is an RSP1 MSI2500 MSI001, which I don't even know if it works with DSDPlus.

I will test the previous version of DSDPlus and let you know if that is working.
 
N

NickFi

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Sydney, Australia
dave3825 said:
Gain can be set two ways. Either in the bat file using -g<num> RF gain (dB) [max]
Can also be adjusted while in FMP24 g/G adjust RF gain


I just focused in every window available including the packet data window, and the only window that either g or G did anything in was FMP24. I could not replicate any error. I would suggest maybe going to the Misc tab and downloading the newest base files.
Click to expand...
Hi Dave,
When entering -g<num> in the batch file, I can adjust the gain, however when I press 'g' it will show "FMP24 Error" and "Error - Remove/reinsert dongle with serial string '00000001'". The later message repeats every one second until I close the application.
I downloaded the latest base files, which were placed in various subfolders inside of my D:\DSDPlus folder. I copied the files I thought necessary from all these folders and I pasted them into my D:\DSDPlus, overwriting the old ones.
I basically copied all executables, all dll's and all cfg files. The described error still appears.
I wonder if I am doing the right thing, by dumping all these different file types into the main folder of DSDPlus. It would be cleaner if the applications would know the existence of the subfolders where the various file types are stored.
Are there any particular files you want me to check to make sure I am using the latest versions?

I was thinking, when I press 'g', maybe the program doesn't know how much to lower the gain, like one unit, five units? Is the program checking a configuration file that indicates how much to adjust, or does the program indicate to drop it one unit?
 

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M

morfis

Member
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NickFi said:
I wonder if I am doing the right thing, by dumping all these different file types into the main folder of DSDPlus. It would be cleaner if the applications would know the existence of the subfolders where the various file types are stored.
Are there any particular files you want me to check to make sure I am using the latest versions?

I was thinking, when I press 'g', maybe the program doesn't know how much to lower the gain, like one unit, five units? Is the program checking a configuration file that indicates how much to adjust, or does the program indicate to drop it one unit?
Click to expand...

All the files belong in your 'dsd' directory but are supplied in zipped sub-directories to allow different levels of repair - see the readme file in the basefiles zip for explanations.

When you press the g/G the step is fixed and no user intervention is necessary.

Doesn't help your problem but using a clean install of the latest DSDFL I can't replicate your error with any RTL device (tested with RTL-SDR.com V3, RTL-SDR.com V4, DVB-T sticks, multiple nooelecs). I repeated the tests with a clean install of the previous DSDFL release and again couldn't replicate your error.
 
mtindor

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I’ve got a better idea. Why don’t you just record some raw audio coming from a voice channel at a time when the control channel shows TDMA activity in the event log window. Then upload that raw audio to some free site where others can then go download it and experiment with it. Or send it to my Gmail address and I’ll put it where I and others can access it. But you’ve got to be running in combine CC/VC monitoring mode and have to record the role audio when you know there’s supposed to be TDMA traffic occurring.
 
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