I will share an ARC500 file with you. In my file, each site is in a different system on a separate scan list.
If you have the control channels in a single system with Multi-Site set to Roam, you will scan only the site with the best signal. If Multi-Site is set to Stationary, you will scan the sites whose control channels are in the frequency list.
Multi-Site is set to Off in each system since there is only a single site per system. You will be able to easily determine which sites are within range. If you scan only a single site, you may be missing traffic affiliating with the other sites. I included all of the frequencies listed for each site in the event there are control channel capable frequencies not listed in the database.
On Motorola P25 systems, you can have a primary and up to 3 alternate control channel frequencies for each site. It appears that only the active control channel frequency at the time is listed in the database. If the site switches to an alternate frequency, you will not be able to receive it unless all of the control channel capable frequencies are programmed. Harris systems can use any frequency as the control channel and often rotate the frequencies.
Here is an ARC500 file for you to try:
Save the attached zipped file to your computer and extract.
Open the extracted file with ARC500. Click on the Scanner tab and Upload to Scanner.
Scan lists as follows:
1. TBT North
2. TBT South
3. TBT Murillo