MARCS P25 Channel ID Table

[daine1619]

Does anyone with more experience listening to the MARCS system know the P25 Channel ID Table?

I was attempting to listen to it and was having some issues that seemed to be around the Channel ID Table.

I used the P25 Channel ID Table from the RFDB, and it says Channel IDs 1 and 2 should have spacing at 12.5 KHz. I thought this was off because all the other phase 1 systems I listen to use 6.25 KHz on the FDMA 7/800 Channel IDs. I am not an everyday listener to the MARCS system and wanted input from people who listen to it more before making any change submissions.

 

[mtindor]

Does anyone with more experience listening to the MARCS system know the P25 Channel ID Table?

I was attempting to listen to it and was having some issues that seemed to be around the Channel ID Table.

I used the P25 Channel ID Table from the RFDB, and it says Channel IDs 1 and 2 should have spacing at 12.5 KHz. I thought this was off because all the other phase 1 systems I listen to use 6.25 KHz on the FDMA 7/800 Channel IDs. I am not an everyday listener to the MARCS system and wanted input from people who listen to it more before making any change submissions.

Here is is from DSDPlus:

Network: BEE00.348 ; Ohio MARCS

Bandplan #0: Base=851.00625 Offset=-45 Spacing=6.25 BW=12.5
Bandplan #1: Base=762.00625 Offset=+30 Spacing=6.25 BW=12.5
Bandplan #2: Base=851.0125 Offset=-45 Spacing=12.5 BW=12.5 Slots=2
Bandplan #3: Base=762.00625 Offset=+30 Spacing=12.5 BW=12.5 Slots=2

So you are right, it is off. It needs to be corrected in the DB. I just updated the database.

 

[daine1619]

Thank You for the info and updating the database!

 

[Tcp14Gd]

Here is is from DSDPlus:

Network: BEE00.348 ; Ohio MARCS

Bandplan #0: Base=851.00625 Offset=-45 Spacing=6.25 BW=12.5
Bandplan #1: Base=762.00625 Offset=+30 Spacing=6.25 BW=12.5
Bandplan #2: Base=851.0125 Offset=-45 Spacing=12.5 BW=12.5 Slots=2
Bandplan #3: Base=762.00625 Offset=+30 Spacing=12.5 BW=12.5 Slots=2

So you are right, it is off. It needs to be corrected in the DB. I just updated the database.

So, if the system is in the DB and you program your scanner via Sentinel, this information is simply contained within?

I've never programmed a P25 System "by hand" but if you do, there are places to enter all these parameters, yes?

 

[redbeard]

So, if the system is in the DB and you program your scanner via Sentinel, this information is simply contained within?

I've never programmed a P25 System "by hand" but if you do, there are places to enter all these parameters, yes?

It's mostly only used by people trying to program commercial radios to monitor with.