"Jay Beckman" wrote:

Where I rent/train, the two closest uncontrolled fields use 122.8 and 122.7
so the FBO squeezes 122.775 in between for calling inbound when returning
from the practice area or from cross countrys.

The FBO freq is also handy if you need something from the office when you
are out on the ramp preflighting and you don't want to leave the plane
un-attended.

As someone who monitors that FBO frequency in the office, we do
occasionally hear other pilots using "our" frequency to converse with
each other. It's intrusive to us because our frequency is supposed to be
for communication between our FBO and OUR pilots (students, renters,
etc.) to make our operations smoother; the unwitting pilots find it
annoying when we tell them they're on our FBO frequency, as if WE are
interrupting THEIR conversation! I don't know if they're in violation of
any regs by using our frequency to communicate, but my guess is that it
doesn't happen frequently enough to pursue it.