I have noticed that sometimes when I scan a P25 trunking system; it will stop and I will see the s-meter show 3 to 4 bars but I won't hear anything. I know that when "DAT" is showing, I won't hear "data" but is does it without "DAT" showing. Is there a P25 adjustment I should make? I am referring in my case to the "Alabama First Responder Network". Also, I am using default settings.
This could be related to the linked data, or LNK data, as displayed on the x36 or XT series radios. The connection between the mobile and the site tower on the trunked system.
A three to four bar signal should be fine. If you have the Extreme update take a look at the Analyze Menu; System Load/Reception Status and the RF Power Plot of the active frequency.
Occasionally, I have solved a reception problem by moving the 536 to another location, a different antenna, or an outdoor (or attic) antenna with a good feed line coaxial cable from the antenna to the 536.