Calculating maximum control channel in a Type II system

[jets1961]

I was wondering what the formula is to calculate the maximum control channels there can be in a type II smartzone system. There must be a formula that calculates the control channels once the band plan is known. In the system I want to monitor has the following band plan from unitrunker:

Base Lo Hi Spacing

851.0125 0 719 25 (all)
866.0000 720 759
867.0000 815 831
868.9750 958 958
867.4250 961 1022

I just want to be able to program all the possible control channels into one bank of a Pro 96 so I know I have them all no matter where I go in the province. Also they must have generic channel numbers that I can use for labels.

Thanks, Joe

 

[mdulrich]

That is the common band plan for 800 MHz trunking. There is no why to calculate control channels, they are pulled out of the FCC assigned channels for each site.

Mike

 

[WayneH]

It's up to four per site. Since the CC's are picked by the system's administrator there's no way to calculate them.

The database should list all of them. Does it not?

 

[N4DES]

The previous posts are correct, there are no specific ways to identify the number of control channels by just looking at the bandplan. As an example, a typical SmartZone configuration can have up to 64 individual sites connected to it, each having 4 control channels , there would be 256 combinations.

So without knowing the specific's of the system internally there would be no way to begin to guess the right number of frequencies.

As to how the CC's are selected, that in itself is unique and specific to each system and is done by the manufacturer based on the combiner and/or antenna design. As an example, we have a 28 channel system split into 7 transmitters going into 4 seperate combiner/antenna systems. One channel in each system is selected as a control channel so if there is a failure of one component it doesn't affect the performance of the other 3.

 

[jets1961]

But the CC must be reused?

Don't the motorola radios limit the number of CC to 32 max, or can there be more?


QUOTE=KS4VT;1043939]The previous posts are correct, there are no specific ways to identify the number of control channels by just looking at the bandplan. As an example, a typical SmartZone configuration can have up to 64 individual sites connected to it, each having 4 control channels , there would be 256 combinations.

So without knowing the specific's of the system internally there would be no way to begin to guess the right number of frequencies.

As to how the CC's are selected, that in itself is unique and specific to each system and is done by the manufacturer based on the combiner and/or antenna design. As an example, we have a 28 channel system split into 7 transmitters going into 4 seperate combiner/antenna systems. One channel in each system is selected as a control channel so if there is a failure of one component it doesn't affect the performance of the other 3.[/QUOTE]

 

[jets1961]

Yes the data base has most.

......

It's up to four per site. Since the CC's are picked by the system's administrator there's no way to calculate them.

I think the data base probably has most if not all CC. I know a lots are reused, I thought the CC usage was designed on cell seperation, so you can reuse channels and CC's seperated by a number of cells?

I guess I will have to sort all the CC in excell to get the lowes numbers of CC's.

The database should list all of them. Does it not?

 

[N4DES]

Don't the motorola radios limit the number of CC to 32 max, or can there be more?

There can be more....I have personally programmed over 40 in my xts2500 for a single system that I have access rights to.

 

[WayneH]

Don't the motorola radios limit the number of CC to 32 max, or can there be more?

With the newer firmware, no. It could be band specific though.

 

[NeFire242]

The last firmware I'm aware of the XTS5000 allows for 850 modes easily, so it can seriously be loaded up!

 

[ILMRadioMan]

Actually XTS5000s are capable of 1000 channels now.

 

[ILMRadioMan]

And CC max in a smartzone system for an XTS 1500/2500/5000 is 128.