By default, Trunker will interpret frequency assignments according to the standard 800MHz map. Use the following process to initialize the xxxxSYS.TXT file for 900MHz, UHF systems, or other systems that do not conform to the standard mappings:
With no xxxxSYS.TXT file in the current directory, start Trunker.
Once the SysId appears, stop Trunker with the 'q' command.
Edit the xxxxSYS.TXT file. Delete all frequency entries.
Add one of the following lines to the file, in uppercase and beginning in column 1, or edit one if it exists already:
PLAN=8 for US 800MHz frequency plan
PLAN=9 for US 900MHz frequency plan
PLAN=0 for all other plans including UHF and custom 800/900
Save the file.
Run Trunker again and accumulate frequencies until the list is stable.
Stop Trunker with the 'q' command.
Edit the xxxxSYS.TXT file as appropriate, replacing any hex values with the frequencies you have determined are appropriate. This may require searching a database of frequency assignments etc. If you set PLAN=8 or PLAN=9, most of the frequencies will be computed already by Trunker. If your system uses non-standard mappings, it will be necessary to edit any incorrect lines.
Special step only for systems that broadcast both the input and output frequencies: notice when pairs of frequencies are energized in synchrony at the beginning of a conversation, and record those pairings. Then move the input frequency to the 'input frequency' column of the output frequency's entry, and delete the line for the input frequency. For example, if 0x015 and 0x207 are related, and 0x207 represents 407.05, carefully change the file entries:
From:
[blank][blank]v0x015[3 blanks],15,ffff
[blank][blank]v0x207[3 blanks],207,ffff
To:
[blank][blank]v407.0500,207,15