Even better than that, FM Translators can identify using frequency-shift keying. Tune into your local translator and see if you can catch some "popping" near the top of the hour. Sounds very close to the "sub-audible" tones some sat services use.
That must be what W220CE 91.9 in Middlefield, CT, does. It relays WGRS 91.5 Guilford, which is nothing but a 24/7 simulcast of WMNR Monroe. W220CE, which puts out a mighty 6 watts from about 550 feet, is never mentioned in the long list of simulcasting stations and translators that WMNR does each hour (WGRS originates nothing of its own, including voice IDs.), so maybe it's being buried in FSK. I'll have to listen for the pops.