I just imported using ARC. System Type set to Mot VHF/UHF which is incorrect. Normally Parker P25 should import as P25 Auto but the trunking tables in database is weird. 380 offset is a Motorola trunking scheme. ARC imports the trunking tables incorrectly also.
Top image is ARC incorrect import.
Bottom is corrected by me.
Click, first set double click Syustem Type and select P25 Manual.
Then double click under Edit T-Tables and make changes as in bottom image.
click65
Actually, the Parker County (Texas) P25 system works very well, without entering any tables at all, in both my PSR-500 (the handheld version of your Psr-600), and the Uniden 396XT. I have it set (and have since it's beginning, several years ago) as P25 auto in both the PSR-500, as well as my 396XT. Both scanners receive the system quite well. (I took a day trip out west, visiting friends today.) I was still able to hear it (using better antennas, like the Diamond RH77CA) on both scanners out in southeastern Stephens County. My location was in the 40-45 mile range from the closest site (Cool, site 1-004), but the 396 was also getting some traffic from Weatherford & Annetta (sites 1-001 & 1-002), and are farther away. (The 500, I'm sure, was as well. But the 396 is set up "multi-site, with the individual sites named so that I can tell which one is being received more easily than trying to match up control channels.) The auto setting also worked in the older BCD396T, before I added the XT, & started carrying it with me instead.
The first screen shot is how the PSR-500 is programmed, without any table information.
The second image shows the table information, filled in by the scanner, while I was in range of the system.
The table information that Frank (fmon) has shown is the same as what the scanner will fill in by itself, if you use P25 Auto (for system type), and let the scanner receive the control channel. It certainly won't hurt to enter the tables, if you want.
It sounds like, as Frank has already mentioned (several posts back) that this may have been set up, incorrectly, as as the default MOT 800/900 when you first tried to enter it manually. Setting it as P25 auto, with the correct control channels, it will work. I listened to it most of the day today, once I got within range going west from Dallas, and until I lost signal coming back (about mid-Tarrant County). Several of the system frequencies are in the 152Mhz range, used by paging companies. So, I suspect that coverage into Tarrant County is restricted by antenna pattern.