This system uses 6E# NACS but the site info doesn’t show any with 6E3 🤔
Maybe you are hearing site 3 and the NAC is listed wrong? Site 3 has the same frequency listed.
Parker County Trunking System Profile
www.radioreference.com
You're probably correct on the source, as well as the NAC.
For that system, the first sites were entered with 6E0 as the site NAC. Sites added later are shown as 6E
x, "x" being the site number. Sometime in the next few weeks I'll likely spend a day visiting a long time friend who lives in Stephens County, which is west of Parker. But I can hear all of the sites on the system from there, so I'll verify, then submit any corrections needed.