396T P25 Band Plan Question

[n4yek]

I recently noticed I have band plan frequencies and step size for a P25 system I programmed into my scanner. The thing about this is, I didn't program those into the scanner so I am very curious as to how those would magically show up.
Would the scanner see these and store them from the data stream of the P25 system?
Any thoughts?

Danny

 

[nd5y]

Would the scanner see these and store them from the data stream of the P25 system?

Yes. The band plan is sent on the control channel.

 

[n4yek]

So the scanner would automatically store these into my system I created? Just confirming your statement.

 

[ka3jjz]

Dan AFAIK it doesn't actually store the bandplan so much as use it automatically as part of the calculation process to find the next available frequency/slot. I think it's used on the fly, and not actually stored anywhere

best regards..Mike

 

[nd5y]

It stores it at least for a while. I just took my 396T and removed the antenna so it lost the control channel. Then I power cycled it and went back to the system, still without the antenna and the band plan was still there. Anyway it isn't something you would ever have to program or edit or be concerned with.

 

[ka3jjz]

That's interesting - I wonder why it would need to store it when it's sent along with all the rest of the data on the CC? It seems unnecessarily redundant.

Mike

 

[n4yek]

Thanks Tom, I was wondering how it got stored into my scanner. It also done this on another P25 system and was curious if the scanner was storing them on it's own, I know I didn't put them there.
Thanks Mike for your input on the subject.

 

[UPMan]

It is stored because otherwise the scanner could not start monitoring the system until the band plan cycled back around in the control channel data. The very first time you monitor a P25 system, it takes a bit longer to start tracking the system due to this...you wouldn't want this latency every time.