On 19 Aug 2011 21:00:51 GMT, dave wrote:

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.

Sure, but we have several other distant repeaters on the same channels
I like to monitor. I also hear plenty of RF leaks and odd sources of
RF as I drive around. So, I turn on the PL decode. With a ham radio,
I just pickup the mic, the receiver stays in PL decode, and proceed to
talk. With the Maxtrac I currently use in the car, as soon as I
pickup the mic, I hear all the junk, which helps to make sure I'm not
causing a problem by talking over other users on the distant
repeaters. (We have somewhat overlapping coverage areas). Also, when
in PL decode, there's about a 600msec delay before the rx squelch
opens, which obliterates the first two syllables.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558