NJ TSYS Motorola channel #'s

[NESN]

I have logged numerous Motorola trunked system channels numbers through my GRE 600 & Pro-197's. If anyone can add more insight into these, please do.

NJSP Troop C : 00248 00328 00368 00308 00288
NJSP Troop A: 00257 00237 00188 00337 00217
Ocean Cty: 00513 00631 00627 00525 00633 00625
Burl. Cty: 00380 00382 00431 00615 00627
McGuire/Ft.Dix 00402* 00456 00665 00489 00585 00505* 00568 00553
FCI-Ft.Dix 00590 00537 00612 00402* 00505* *shared channels?
Manchester Twp 09000

 

[robbinsj2]

*shared channels?

No, the same channel numbers but since the configurations are different they map to different frequencies.

For anyone interested, you can figure out the associated frequency by taking the channel number, subtracting the offset, multiplying by the step, and adding that to the base frequency. If there are multiple configurations for the system, use the one whose offset is the closest one below the particular Motorola channel number.

For example, McGuire/Ft. Dix is base 406.000, step 12.5, offset 380; take channel 00505 on it.

505 - 380 = 125
125 * 12.5 = 1562.5kHz or 1.5625MHz
1.5625 + 406.0000 = 407.5625MHz.

FCI Fort Dix channel 505 works out to 408.6125, which isn't listed in the database as a system frequency. Does anyone care to scan 408.6125 conventionally and see if this is correct?

For regular 800MHz Motorola systems like NJSP there is a standard base/offset/step configuration preset for the band, which is why you don't have to program it into the scanner. I'll poke around and see if I can find what it is, or find enough data to calculate it, and post it here if/when I do.

Jim

 

[robbinsj2]

I calculated the standard Motorola 800MHz table from some Trunker data on NJSP Troop C. It should work for all regular Motorola 800MHz systems, pre-rebanding at least. I haven't followed what the rebanding implications on Motorola systems are so I don't know whether or not this would be affected.
Base=851.0125MHz
Step=25.0kHz
Offset=0

With an offset of 0 you can effectively skip a step in the calculations. Take the channel number, multiply it by 0.025MHz and add it to 851.0125MHz.

 

[jeff]

408.6125 is not a FCI Dix system freq