Hemet
I listen to HEMET on the "WEST" system from East Hemet on a Pro-97 and a Pro-2055, both base and mobile. It's quiet and no complaints whatsoever!
When you said "Central", does that mean you are listening to the Central Talk Group?
West works fine here and in Beaumont, Cherry Valley out Gilman Springs Road to Mo Valley.
I bought a "2052" just before Christmas, IT would sometimes (too often) let a loud data blast come through. I didn't like it at all, and returned it for a new 2055.
IF you program the WEST system be sure to leave CH 6 blank as indicated in the database.
Good Luck!
Re-Reading your noise complaint, it sounds exactly like that if your radio is not in the "trunking" mode. If I take my scanner out of the trunking mode I will hear a pulsating data sound. I've heard the old jingle a long time ago. It's not in use here anymore, so that's not it.