800 rebanding and Trunker

[BDB]

With the new 800 channel look up table available is there any plan to change trunker for the new table ?

 

[petrol88]

Will my PRO-92 still be able to trunktrack after rebanding?

 

[BDB]

I do not believe control channel only trunkfollowing will work in the radios that support the feature . (The Pro 92 doesn't have that feature). Any scanner that has the system frequencies entered should be ok.

 

[petrol88]

Bummer that CC only will stop working. I thought it would be worse than that, though (thought that if the CC tells the scanner to jump to a frequency based on the old band plan the scanner would hose up because it wouldn't find that frequency...how will it know which voice frequency is the right one to jump to?)

 

[EricCottrell]

Hello,

Handy before and after Frequency Table
http://www.motorola.com/cgiss/800rebanding/docs/Pre- Post-DecisionBandPlan.pdf

These are the bandplans used in Trunker for 800 using the trunker map file format (Base, Step, Base hex code).
Normal
851.0125,0.025,0
866.0000,0.025,2d0
867.0000,0.025,32f
868.9750,0.000,3be
867.4250,0.025,3c1

Splinter
851.0000,0.025,0
866.0125,0.025,258
866.0000,0.025,2d0
867.0000,0.025,32f
868.9750,0.000,3be
867.4250,0.025,3c1

The bandplan looks weird because the codes for normal 800 plan goes from 851.0125 to 868.9875 with 25 KHz steps then covers the old NPSPAC splinter channels from 866.000 to 868.9750 with 25 KHz steps. Since splinter channels above 866 MHz are covered, the Splinter 800 plan reverts to the same as the normal 800 plan at 866.0125 MHz.

Looking at the Motorola materials on their 800 MHz Rebanding website
http://www.motorola.com/cgiss/800rebanding/general.shtml
indicates that NPSPAC users are going to have to upgrade radio firmware and other users will have to reprogram the radios. This indicates to me that motorola is only going to change the frequency codes for the "splinter" NPSPAC users. So Trunker and Scanners will work for normal trunked systems but will not work for some NPSPAC systems.

I suspect the new map will be
Normal (Post Rebanding)
851.0125,0.025,0
851.0000,0.025,2d0
852.0000,0.025,32f
853.9750,0.000,3be
852.4250,0.025,3c1

Basically the 866 to 869 MHz splinter channels are redefined to 851 to 854 MHz.

73 Eric

 

[petrol88]

Hmmm. Ok, I think I get that. You are saying we just need to enter a different band plan into the scanner after rebanding. But I've never had to enter a band plan before for 800 MHz (I'll have to check, but I don't think my 92 will let me do that ... only for UHF).

I don't think Unidens let you enter a band plan except for UHF and VHF, either...if you can't enter a band plan, will the scanner still know how to track?

 

[BDB]

So even say a BC785 programmed with the system of interest's voice and data channels will not follow a system with spinter channels ? I would think that more persons on the forum would be interested in this.

 

[EricCottrell]

Hmmm. Ok, I think I get that. You are saying we just need to enter a different band plan into the scanner after rebanding. But I've never had to enter a band plan before for 800 MHz (I'll have to check, but I don't think my 92 will let me do that ... only for UHF).

I don't think Unidens let you enter a band plan except for UHF and VHF, either...if you can't enter a band plan, will the scanner still know how to track?

With some versions of Trunker you can define a map file. Otherwise you could change the plan to 0 and manually enter the frequencies.

Scanners would be more of a problem. You can not override the 800 MHz selection and enter parameters. Scanners very likely need a firmware upgrade to fully receive all NPSPAC trunked systems.

73 Eric

 

[BDB]

Well I wouldn't blow any money on a scanner for awhile then I my aim was to monitor a TRS.