Jeff Liebermann wrote:


Incidentally, there's another difference between ham and commercial
mobiles. Commercial mobiles have a PL hang up function, where the
receiver is in PL decode when the mic is hung in the hanger, and goes
to carrier squelch when removed. Many ham mobiles seem to be missing
this useful feature.



This is so the commercial operator listen to the whole channel (and not
just his company's CTCSS filtered traffic) prior to transmitting. A
typical ham channel is continuously monitored and everyone has the
same CTCSS tone.