Maybe some amateur repeaters are transmitting a PL tone....if so I
didn't realize that, and persons in the coverage area could be open to
interference if for some reason they attempted to share the frequency
using a different tone or no tone (and vice versa). The best bet, as
we all (should) know, is to listen first, ensure the frequency is clear,
then transmit.

The 2 repeaters that I mentioned both allow you to set your radio for tone
DEcode so that you will only hear that repeater. Both of them have other
repeaters coming in when there's the slightest enhancement. Fortunately for us,
our mics don't need to be grounded so the decode function is always there,
squelching out those other repeaters that are coming in and allowing us to
share the frequency.
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73! de Andy KC2SSB - WPYI880 (GMRS)
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com