[FedCom] Strange tones on 165.2125

[Dennis]

    I'm hearing strange tones on 165.2125 here in Anchorage.  Several,
high-pitched 'chirps', probably 5-6 of them, in rapid burst, occuring
regularly. They are widely spaced so haven't bothered to time the intervals,
but appears to be happening regularly. Anyone know what this might be? Does
SecServ (think that's right) use some sort of tone paging or signalling on
their usual frequencies? The tones somewhat resemle a telephone ring aside
from the long interval inbetween rings.  Hmmmm, interval seems to be about
one minute. Very distinct, don't think it's intermod or image freq.

Dennis, WL7AQ
Anchorage, Alaska