BCD536HP/PT nxdn decoding issues.

[mbui03]

Good day to all,

I've been having a lot of issues recently with both of my Unidne scanners, I find this issues isn't limited to one single model but the 436HP and PT models, but also the 536HP/PT models (yes I have all 4 model).

These all work perfectly for P25, DMR and NXDN (trunking) but the issue is with NXDN One Freq.

All scanners have had antennas changed from small whip inside of a house, to side mounted dipoles, and even a discone which are both attached to the roof.

The scanners are all programmed to monitor 1 single frequency which has a dispatch tx on RAN5 and units tx on RAN10 (prevents chat between units). The site is approx 10-15km's away from the receivers and not located close to any other repeaters that may cause intereference.

I've tried various things such has manual digital threshold (at level 9) and auto, switching between NFM and FM, squelch high, low middle, holding sites, departments, systems and even channels to no available way of correcting the issue. I will note that the same antennas have been connect to an SDR running DSDPlus with fastlane and it receives clear decodes without issues (Yes I know this is different software but it was a good test to check signal quality).

These units will work for hours on end without fault but randomly just fail and not decode anything.

I've attached a log file from the UBCD536PT and noticed the constant FACCH1 CRC Error, Call Type Error and on screen I get a constant switch between NX4 and IDAS.

Any help would be greatly appreciated.

The following is clear decodes:

0498252 Data Type: 01 Alias Tag: 42756E646F6F7261206261736500 Alias Flag: FF Call Type Proprietary Form Message 3F68820444000001A300000000000000000000000000
0498253
0498253 NXDN48 QSYNC to FSYNC
0498254 648CDF59
0498254 NXDN48 FWD_PRT_CNT: 00
0498270 95D648A924AD3AC2
0498270 RAN: 05
0498329 69BAFFD271B637BFADBCB218B88F894D89F7CAE08E000D1EE8CE409794DBEA3D96880D07
0498329 NXDN48 Frame End
0498334 B8EC9F59
0498334 NXDN48 FWD_PRT_CNT: 00
0498349 959648D830AA228C
0498349 RAN: 05
0498409 AF9C99953D1DC6EBA4A64BEE828F95F5700D7DE7D983D1BAC4DFFACEF6C94843160C4065
0498409 NXDN48 Frame End
0498414 81FCDF59
0498414 NXDN48 FWD_PRT_CNT: 00
0498429 D5D7ED3A02598D63
0498429 RAN: 05
0498489 AB3DFE76339196903A2AD25EACCCA07026429AD59A22787C55AA7E5FF3E9DDC9C93DBA4D
0498489 NXDN48 Frame End
0498494 999CDF59
0498494 NXDN48 FWD_PRT_CNT: 00
0498509 D5D7DD1B42EA717F
0498509 RAN: 05
0498569 EF065156BFDA20547EA43DCC46DFFCACF873F099252C3F7881C3AF181F56602B979C5D12
0498569 NXDN48 Frame End
0498574 4B1CDF59
0498574 NXDN48 FWD_PRT_CNT: 00
0498589 D5D75833C5B594D9
0498589 RAN: 05
0498649 AB9B92F3B96617E927481472E8914E66FC8E5752F5423A390B278406F2D5EE3AF110FCB7
0498649 NXDN48 Frame End
0498654 CB8CDF59
0498654 NXDN48 FWD_PRT_CNT: 00
0498670 D5D761DC87230AEF
0498670 Data Type: 00 Alias Tag: 42756E646F6F7261206261736500 Alias Flag: FF Call Type Proprietary Form Message SA 3F6882041442555320


The following is broken decodes:

0579187 Area: 00
0579246 E3E3FA7E47BF9393206C7A7864EBB185201FE0FBEBEC49173261E8BFFFE9603919A518F7
0579246 NXDN48 Frame End
0579250 CF989F59
0579250 NXDN48 FWD_PRT_CNT: 00
0579267 99656190302E0A86
0579267 Data Type: 00 TGID: 00004400 UID: 00000012 GoToRep: 0002 Home CH: 08 CCH: 0000 Call Type IDAS SA 024400001000007261
0579267
0579267 Area: 00
0579298 691921A642A8B2828A0C39832A2A4033384AEA91
0579298 Data Type: 01 TGID: 00000000 UID: 00000078 Emergency: 00 Call Type TX Release 08002028780000000000000000000000000000000000
0579328 01246A021200028EBB032A8A68113AC2
0579328 NXDN48 Frame End
0579328
0579328 Data Type: 01 TGID: 00000000 UID: 00000078 Emergency: 00 Call Type TX Release 08002028780000000000000000000000000000000000
0579330 C83CDF59
0579330 NXDN48 FWD_PRT_CNT: 00
0579347 DD756190302E0A86
0579347 Data Type: 00 TGID: 00004400 UID: 00000078 GoToRep: 0002 Home CH: 08 CCH: 0000 Call Type IDAS SA 024400001000007261
0579347
0579347 Area: 00
0579378 691921A642A8B2828A0C39832A2A4033384AEA91
0579378 Data Type: 01 TGID: 00000000 UID: 00000078 Emergency: 00 Call Type TX Release 08002028780000000000000000000000000000000000
0580602 01246A021200028E
0580603 NXDN48 ASYNC Open to QSYNC
0580603 983CDB59
0580603 NXDN48 FWD_PRT_CNT: 00
0580617 8572C6B0324D3BA5
0580617 SACCH CRC Error
0580618
0580618 Call Type CRC Error 32223C00133000000000000000000000000000000000000000
0580649 8EBD63F441913EB0D3AF68CE9BCAECBD
0580649 FACCH1 CRC Error
0580649 896156A5
0580649 Call Type CRC Error 3F6899C2AE9E3EEE6400152000000000000000000000000000
0580679 532C635B8AB2532F3B24F322FC904C6B
0580679 FACCH1 CRC Error
0580679
0580679 NXDN48 Frame End
0580679
0580680 Call Type CRC Error 3F688204246F78F26100DD1000000000000000000000000000
0580681
0580681 NXDN48 QSYNC to FSYNC
0580681 566C9B59
0580681 NXDN48 FWD_PRT_CNT: 00
0580698 9566DA0966E607DB
0580698 Data Type: 00 UID: 00000011 Home CH: 14 Call Type IDAS SA 44A011C01000007261
0580698
0580698 Area: 00
0580729 4AED73FE41B1323EDB8C38966FD8F4F6C3255425
0580729 Data Type: 01 Alias Tag: 0000000000000000206261730000 Alias Flag: 04 Call Type Proprietary Form Message 3F688204342062617300000000000000000000000000
0580759 13AC0176823554AEFAB66B0EF6DECF3A
0580759 NXDN48 Frame End
0580759
0580760 Data Type: 01 Alias Tag: 0000000000000000206261736500 Alias Flag: 0C Call Type Proprietary Form Message 3F68820444650004F500000000000000000000000000
0580761 B4CC9B59
0580761 NXDN48 FWD_PRT_CNT: 00
0580778 959642F920A92B14
0580778 Data Type: 00 TGID: 00008000 UID: 00000011 GoToRep: 0004 Home CH: 10 CCH: 0000 Call Type IDAS SA 248000001000007261

0582201 NXDN48 QSYNC to FSYNC
0582201 03DCDF59
0582201 NXDN48 FWD_PRT_CNT: 00
0582217 D5D7E77812DCB4FF
0582217 Data Type: 00 UID: 000005EA Home CH: 11 Call Type IDAS SA 648DEA801000007261

0855270 Call Type CRC Error 0C22360ECB3000000000000000000000000000000000000000
0855301 DEDBDEC951F5F37E57D948FD5B11C594
0855301 FACCH1 CRC Error
0855301 CD7DF6F3
0855301 Call Type CRC Error 433F56FD93D04792DBBDEF5000000000000000000000000000
0855331 7D1C1CE5257FCC87F75559C46297B9A5
0855331 FACCH1 CRC Error
0855331
0855331 NXDN48 Frame End
0855331
0855331 Call Type CRC Error 46029843A718D96CA877B77000000000000000000000000000
0855334 71FE693C
0855334 NXDN48 FWD_PRT_CNT: 02
0855432 8B6FC4FFD6564F57DFD8DFFF6DEF3DFD95D545F5545DDD74F7D76FCD6FB5954D1D553FDB6F7F5BD77F257B7B
0855432 FACCH2 CRC Error

 

[werinshades]

We've posted before on NXDN One Frequency issues. Might be related?

NXDN One Frequency vs Conventional NXDN Programming

I've been working on a couple new NXDN systems here and have noticed something on both the x36hp and SDS 100 while programming. When I program the system as a One Frequency NXDN and add the TGID 0, both scanners seem to miss alot of transmissions. When it's programmed as Conventional NXDN...

forums.radioreference.com

 

[UPMan]

This is an IDAS system, not OFT. Should be programmed as a trunked, not OFT, system.

 

[werinshades]

This is an IDAS system, not OFT. Should be programmed as a trunked, not OFT, system.

...and make sure you run LCN Finder to get the proper assigned channel numbers by the system administrator..

 

[Dan_M]

what is OFT system?

 

[werinshades]

what is OFT system?

One Frequency Trunk.

 

[mbui03]

This is an IDAS system, not OFT. Should be programmed as a trunked, not OFT, system.

Sorry to say but it is not. It is a NXDN48 single frequency. I know this as I use the radios at work.

It's not a trunking system, has no LCN'S, and doesn't require to be programmed as a trunking system.

The 2 only RAN's used are RAN 5 RAN 10.

I'll post a video shortly of the issue but as mentioned in another thread, there is Definately an issue with nxdn oft as the only work around is to have the frequency programmed as a conventional channel with digital search but that causes issues as there is no radio Id monitoring which is great to have with NXDN to monitor fleet and review recordings.

Just to note as well, Dsdplus fastlane doesn't have issues decoding this single frequency, it has never once changed from cb to tb or from NXDN48 to IDAS so i can safely say the issue is on the firmware side of the scanner and not the system, also, I have had this issue for the past 2 years of owning 2 portables and made the bold jump to get the to base units and still have issues with all 4. And it's funny the fact that 1 will decode nx48 but the other 3 will go dead then another might work but the 2 won't... pretty confusing but hey, just trying to give you as much info as you need.

Final note is, if this was IDAS pr trunked then my nx5300k2 shouldnt be unmuting for me.

 

[mbui03]

This is through DSDPlus Fastlane, I Can definitively say that it is not an IDAS network nor a trunking system being monitored. It is a simple conventional NXDN channel with 2 working RAN codes.

 

[mbui03]

Here is a photo of the small setup.

MEGA

and here is the video of said issue.

MEGA

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