NXDN Calculator V3

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kh6sz

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For those of you who have seem and used my nxdn calculator, I've updated it again. It now has the original section where you need 2 channel and frequency pairs in the SAME bandplan, then it will give you the Step size and the Base frequency. Then you can enter either a channel or frequency and it will give you the other.

I've added a new section to V3 that uses the standard bandplan formula for UHF, and all you do is enter a frequency and it will give you the channel. Of course if the system is not using the standard bandplan, then the info will be wrong. Use this as a tool and not as facts. It least it's a good place to start.
 

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kh6sz

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Do you happen to have a calculator for VHF?
I don't have any VHF systems here that I can test, but the main (upper) part of the calculator should work for any bandplan because it will figure it out with the 2 known channel and frequencies. If someone knows what the formula is for VHF, and if it's different from the UHF, let me know and I can add it to the program.
 

wx5uif

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Broken Arrow, OK
All the VHF NXDN systems I've seen so far seem to have no actual band plan and just numbers assigned to frequencies.
Something like below.
154.25 CHID 1
153.0625 CHID 2
156.000 CHID 3
 

b1tr41d

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All the VHF NXDN systems I've seen so far seem to have no actual band plan and just numbers assigned to frequencies.
Something like below.
154.25 CHID 1
153.0625 CHID 2
156.000 CHID 3
I concur.
UHF band is more planned out than the VHF band is.
 

garys

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The only VHF NXDN near me uses Channel numbers, 1, 3, 5,... 11. All of the frequencies are in the 152.00 Part 22 allocation.
 
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