RClary11
Member
I notice there are other base frequencies in the fleetnet system, 151.7300 and 154.3200, what are they for and do they use the same control channels?
Base Frequencies
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The base frequencies really don't have anything to do with the control channels. The base frequencies are part of the mathematical equation the trunking system does to determine the voice channel frequencies. On Fleetnet only a handful of towers use the other base frequencies. If you look at site 40 (Toronto) you will see the last frequency listed is 152.0000 which is well out of range compared to the 142/143mhz frequencies. Because this frequency is in a different range, it uses a different base frequency than the lower range.
That was sort of a crappy answer... this link can explain it much easier
Determining Base/Step/Offset for VHF/UHF Motorola Systems - The RadioReference Wiki
It's maybe a little bit more info than you are looking for, but if you read thru it you will certainly get a much better idea of how the base/step/offset plays into the operation of Motorola systems.
That was sort of a crappy answer... this link can explain it much easier
Determining Base/Step/Offset for VHF/UHF Motorola Systems - The RadioReference Wiki
It's maybe a little bit more info than you are looking for, but if you read thru it you will certainly get a much better idea of how the base/step/offset plays into the operation of Motorola systems.
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RClary11
Member
Thanks, what I was wondering mostly was I missing anything by not programming them into my scanner.
Unless you are trying to monitor a site that requires the extra base frequency, you won't be missing anything. Also note that with the Pro-96/2096 scanners the extra band plan information can only be programmed with software (Win-96 etc) and cannot be done thru the keypad.
Did you not put at least the first set of base/spacing/offset figures into the appropriate place when you programmed the trunking system? The scanner needs this info so it knows what frequency to go to.
RClary11
Member
Yes I did enter those, Forts gave me the instructions of what to program in for my area.
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