Need Help with steps and offsets on P25

[BamaScan]

I am trying to scan a Project 25 digital system. I am picking up some Id's and some voice traffic. My question is how do you figure out the "Motorola Band Plan" ?? I need to figure out the steps and offsets. "What would be the base frequency" I was able to find the control frequency and go from there. I am missing parts of the conversations.

[AlabamaRS]

try unitrunker or pro96com??. just a guess

[ChrisP]

Originally Posted by BamaScan

I am trying to scan a Project 25 digital system. I am picking up some Id's and some voice traffic. My question is how do you figure out the "Motorola Band Plan" ?? I need to figure out the steps and offsets. "What would be the base frequency" I was able to find the control frequency and go from there. I am missing parts of the conversations.

What system is it and what type of scanner are you using?

If it is a true P-25 trunked system, you shouldn't need any band plans or base and offset values.

- Chris

[fmon]

Originally Posted by BamaScan

I am trying to scan a Project 25 digital system. I am picking up some Id's and some voice traffic. My question is how do you figure out the "Motorola Band Plan" ?? I need to figure out the steps and offsets. "What would be the base frequency" I was able to find the control frequency and go from there. I am missing parts of the conversations.

"Where the logleaf pines grow tall in South Alabama" doesn't tell us what you are trying to scan. However, judging from your other post could the system be U.S. Dept. of Defense: Southeastern Region? If so, the TSYS is not Motorola but instead, P25. That being the case, set TSYS to P25 Auto which will automatically populate the tables.

If the system is in fact Motorola, what system are you attempting to program?

[BamaScan]

I am trying to monitor Fort Rucker. It is in the 138 mhz range and P25 Digital . The scanner is the new BCD996T I tried setting up just the control frequencies and going then in Id Scan. I was able to pickup a handfull of unknown Id's with that set up. I was still unable to pick up the MP's and Crash Crews as well as the Fire Department. I knew they had to be somewhere in the system. So tonight I rechecked all of the controls I had and could not find anything new. So what I have done is set all my digital frequencies up one one bank. I made the bank a convential system then went and made each frequency digital. Then I put it in scan. Then wow. I found the MP's, Crash Crew and Fire Department. This show's that I am 1) missing a control 2) I need a band plan. or 3) The Fire, Crash and MP's are using a single frequency and not trunked. I still think it is trunked because I hear other users on the same frequency. If you look here:
Scanner Frequencies: Shaw Air Force Base Trunking System, Sumter, South Carolina
It shows a band plan for another military system. The band plan is what I think I need. There must be some way to figure out the band plan. It's not like I could walk up to the base and ask for it. I would like to set up my trunked scanner the way it is to be set up.

[fmon]

Run a search for CC in area of 139-142. The Shaw system is still building also. Note the two custom frequency tables, one is listed in Misc System Information and has an offset in the 12th identifier value. I.e. 4096*12=49152. The other listed table doesn't have an Offset value.