Posted by Dennis E. on July 16, 2001 at 10:47:29:
In Reply to: Re: US Forest Freqs MASTER LIST - Revisited posted by Chris on July 16, 2001 at 08:05:50:
Chris,
I was hoping you include your e-mail address so I could get back to you privately, but anyway, lemme give it a shot....
PL means Private Line, a trademark of Motorola. Its technical name is CTCSS...rather than typing a whole explanation, here is a web site that explains it -- http://www.eecis.udel.edu/~dra/pl.html
Many scanners -- the older ones -- typically do not offer it as a feature. There are many reasons I like it. Just to name one? In Western Washington, 155.295 is shared by a number of users and the only one I want to listen to is Airlift NW, medical helicopter dispatching. But 155.295 is also used by some school districts. So, by telling my Uniden 780 to "listen" to 155.295 when only a certain PL tone is programmed in, I don't have to listen to the school buses and only hear the helicopters. Another reason I like it is that in urban areas, there often can be interference on one frequency from other transmitters. "Turning on" PL for that frequency or user you want to listen to generally significantly reduces the interference. Hope that all helps?
: Hey there, I'm just wondering,again, what PL tones are. If someone could explain I would sure appreciate it.
: Thanks again...
: Chris