Strange sounds on OCPS-4

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W2SJW

W2SJW

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Guys,

Have a friend in Pt. Beach that is getting a weird mix of signals coming through on OCPS-4. He has a 796D, so I'm pretty sure that it's not an image coming through.

I've linked to the sound he provided me on my own server. The main sound really sounds like DMR to me, and there can clearly be heard analog audio in the background with MDC & some QCII paging as well.

He's using an indoor antenna, so I highly doubt it's front-end overload.

http://w2sjw.com/sounds/vox.mp3

UPDATE - I patched the output audio from my media player into DSD+ & got this:
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=4 Unknown TypeD
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=2 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=11 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=11 Rate 1 Data
-DMR CACH ERR slot2 BS DATA ERR3 DCC=1 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 Idle
-DMR slot1 BS DATA ERR3 DCC=8 Unknown TypeB
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=5 Unknown TypeD
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=8 Unknown TypeD
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=5 TLC
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 Rate 1/2 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 TLC
-DMR CACH ERR slot2 BS DATA ERR3 DCC=12 Unknown TypeC
-DMR CACH ERR slot1 BS DATA ERR3 DCC=12 Rate 1 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=4 Rate 3/4 Data FEC FAIL
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=8 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=2 Voice Hdr
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 TLC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=2 Unknown TypeF
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=4 Unknown TypeD
-DMR CACH ERR slot2 BS DATA ERR3 DCC=11 Rate 1 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=11 Rate 1 Data
-DMR CACH ERR slot2 BS DATA ERR3 DCC=10 Idle
-DMR slot1 BS DATA ERR3 DCC=12 Rate 1 Data
-DMR CACH ERR slot2 BS DATA ERR3 DCC=8 Unknown TypeE
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 Rate 1 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 Unknown TypeC
-DMR slot1 BS DATA ERR3 DCC=12 Rate 1 Data
-DMR CACH ERR slot2 BS DATA ERR3 DCC=4 Unknown TypeD
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 CSBK
-DMR CACH ERR slot2 BS DATA ERR3 DCC=4 Unknown TypeD
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=4 Unknown TypeD
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=8 Rate 3/4 Data FEC FAIL
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 Unknown TypeC
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Unknown TypeB
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=15 Voice Hdr
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 MBC
-DMR CACH ERR slot2 BS DATA ERR3 DCC=9 TLC
Sync:-DMR
-DMR slot1 BS DATA ERR3 DCC=11 Rate 1 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle
-DMR CACH ERR slot2 BS DATA ERR3 DCC=11 Rate 1 Data
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 Unknown TypeC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 PI Header
-DMR CACH ERR slot2 BS DATA ERR3 DCC=9 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=5 Rate 1 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
-DMR CACH ERR slot2 BS DATA ERR3 DCC=11 Rate 1 Data
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Unknown TypeC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 TLC
-DMR CACH ERR slot2 BS DATA ERR2 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=5 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 PI Header
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 Rate 3/4 Data FEC FAIL
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=3 Unknown TypeD
-DMR CACH ERR slot2 BS DATA ERR3 DCC=9 Unknown TypeB
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 Unknown TypeB
-DMR CACH ERR slot2 BS DATA ERR3 DCC=0 Unknown TypeC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 Rate 1 Data
-DMR CACH ERR slot2 BS DATA ERR3 DCC=8 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Data Header
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=2 Unknown TypeC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=11 Idle
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=0 PI Header
-DMR CACH ERR slot2 BS DATA ERR3 DCC=9 TLC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=4 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=2 Idle
Sync: no sync
Sync:-DMR
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Unknown TypeB
Sync: no sync
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Unknown TypeD
-DMR CACH ERR slot2 BS DATA ERR3 DCC=9 Unknown TypeB
-DMR CACH ERR slot1 BS DATA ERR3 DCC=8 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=9 MBC
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=3 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=4 Unknown TypeD
Sync:-DMR
-DMR CACH ERR slot1 BS DATA ERR3 DCC=12 Rate 1 Data
-DMR CACH ERR slot2 BS DATA ERR3 DCC=1 Unknown TypeC
Sync: no sync
Click to expand...
 
Last edited:
rr60

rr60

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Mixing

Has mixing been considered with the IF? Not sure what it is for the 996 but 476.4875-21.6=454.8875.

I would search around that center freq when the DMR mixes in.

Why not enable pl dpl.
 
W2SJW

W2SJW

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Good question about the IF mixing. Lots of DMR these days on the lower-half of the 450's. I'll ask him why he wasn't using PL/DPL. Maybe he was doing some band-searching to kill some time & came across it (?).

I'm driving myself nuts right now trying to get DSD+ to actually play the audio file. I converted it to the proper WAV format, but it keeps flying through it in 10 seconds & not broadcasting any audio. Using this:
DSDPlus.exe -fr -v4 ? vox.wav
Click to expand...
 
Tech792

Tech792

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Definitely sounds like intermod or some kind of mixing to me. You can hear another voice in there.
 
rr60

rr60

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Decoding

W2SJW said:
Good question about the IF mixing. Lots of DMR these days on the lower-half of the 450's. I'll ask him why he wasn't using PL/DPL. Maybe he was doing some band-searching to kill some time & came across it (?).

I'm driving myself nuts right now trying to get DSD+ to actually play the audio file. I converted it to the proper WAV format, but it keeps flying through it in 10 seconds & not broadcasting any audio. Using this:
Click to expand...

If you are trying to decode voice with that signal that may be unlikely. It sounds like polling or similar. No voice traffic on that at all IMHO. IT sounds to me that it all has the same amplitude if you will. DMR voice traffic does not sound like that.
 
902

902

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Location
Downsouthsomewhere
Sounds like a complex mixing product. The paging frequency and the DMR frequency are part of it, but sounds like there may be another in the mix.
 
W2SJW

W2SJW

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Messages
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Location
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Well, it's not my friend's scanner as the cause - I am working in Neptune today & just heard the same DMR+analog mix on my Icom ID-880 mobile.

Someone seems to have a transmitter that's sending out spurious signals causing that mix. I need a few others here that actually live in the county to monitor OCPS-4 in CSQ to doubly corroborate this...

Sent from my Galaxy S6 via Tapatalk 4
 
W2SJW

W2SJW

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Messages
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Location
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Minor update - heading back up the GSP from the service call, I heard the 'mix' again for a good 2 seconds between MM 107 & 108 northbound, and it pinned the S-meter on my mobile radio. This is looking more like the offending signal is in southern Monmouth County...
 
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