WRVB868

New one for me as well. It's also a little funny reading the article @Lscottllinked talking about how busy .52 gets, because it definitely doesn't in my part of central CA...may be different elsewhere.
I've caught a couple SOTA/POTA activators, one up toward Yosemite and the other in Kings Canyon/Sequoia, but outside of them, a couple local hams that pop up once or twice a month, and someone that has their APRS beacon set there, .52 is largely dead.

I simply run decode tone on my repeater output frequency and never hear the low power unlicensed radio chatter. The repeater overpowers the portables at the local store / business. It's annoying if you listen to it but just block it with tone. 

Pretty sure Crestline .575 is not linked.. If it was you would be seeing everyone complaining about the non-english long-talkers on it all day with out ever ID'ing with a callsign.