Need help with a band plan for a 996T

[I_am_Alpha1]

Hello all,

Been working on a BCD996T and it's not receiving. The system is a brand new 700MHz HARRIS P25 Phase 1. It is Phase 2 capable, but is only operating in Phase 1. Attached are screen shots from Unitrunker with the system information. I've tried directly downloading from RR and it won't work. I need to use Custom Band Plan in ARC996 to program the scanner...having trouble calculating the correct figures. I have system type set to Motorola Type 2 / P25. I need the Lower, Upper, Step, and Offset for the custom band plan...I've tried numerous variations with no luck. The repeater offset is +30MHz and there are no Peers listed (it is a 6-site simulcast system). Thanks all...

 

[Whiskey3JMC]

Simulcast? Perhaps this would be best received with the SDS series scanners? All other models are hit or miss on simulcast systems

 

[maus92]

I'm not familiar with this scanner or ARC996, but P25 systems download the band plan OTA. You should set the type to "P25 Standard" or just "P25"- it is definitely not a Moto type 2 system. I'll assume that you have installed the latest firmware for the radio. Is this the Charlotte FL system? The RRDB has only one band plan entry for it: Base: 769.0000 Spacing: 6.25 Offset 380, which is pretty standard for P25.

Firmware: BCD996TFirmwareUpdate < UnidenMan4 < TWiki

Charlotte County Trunking System, Various, Florida

Charlotte County Trunking System Profile

www.radioreference.com

Finally, P25 simulcast systems - and particularly Harris P25 systems - are notorious for being hard to receive with older scanners unless you are lucky to live very close to one tower site.

 

[I_am_Alpha1]

The math that I figured shows this:

772.04375, chan 487
772.81875, chan 611
equates to 6.25 channel step

769 base freq, 772.04375 voice freq, 487 chan, ZERO offset, 6.25 step...Offset of 380 doesn't equal the known base freq.

I'm running ID search and nothing...not even anything on the signal meter. It is something with the band plan, just have to get the correct numbers for a Harris system. NOT going to spend SDS kinda money on a broadcastify feed.

 

[maus92]

The math that I figured shows this:

772.04375, chan 487
772.81875, chan 611
equates to 6.25 channel step

769 base freq, 772.04375 voice freq, 487 chan, ZERO offset, 6.25 step...Offset of 380 doesn't equal the known base freq.

I'm running ID search and nothing...not even anything on the signal meter. It is something with the band plan, just have to get the correct numbers for a Harris system. NOT going to spend SDS kinda money on a broadcastify feed.

Op25, SDR dongle, and a Raspberry Pi4 would be a cheap solution, but a PITA to set up. Works though, but not bulletproof / reliable - requires restarting from time to time. I find an Intel NUC to be better than a Pi.

I have several Harris P25 systems logged in a UT2 database, I’ll check the band plans later today when I get back from the field.

 

[I_am_Alpha1]

Additional info...I have programmed all 12 freq's as conventional and scanned them. Am receiving traffic and decoding...signal meter 3 bars. Does miss traffic...expected as Harris doesn't hold the frequency between parts of a conversation.

 

[cg]

You can try 769.00625 as the base frequency. regardless, you should be getting a signal with the control channel entered.

chris

 

[I_am_Alpha1]

And now it works. I had the squelch way up for the last system...turned it down and it works--interesting since old system was analog and new system is digital. Hate it when you spend all day on a project and it's a simple box tick or transposed digit that breaks everything. Thanks for all the help.

 

[maus92]

And now it works. I had the squelch way up for the last system...turned it down and it works--interesting since old system was analog and new system is digital. Hate it when you spend all day on a project and it's a simple box tick or transposed digit that breaks everything. Thanks for all the help.

Real quick - did you check for the latest firmware and if there is a system type option for P25 standard or one that doesn’t include mention of Moto type 2?