I guess it is time again for a bit of clarification for the apparent newbies: PL ... is a registered trademark of Motorola Inc. properly known as Private Line. A very polite way of saying the same thing here is Continuous Tone Coded Squelch System or CTCSS. The following is for all but specfically Mike Morris as well: The reference to hz is also incorrect ... as is an abbreviation of Hertz, a persons last name. Specifically should be Hz. In my opinion, is a slight flaw in the voice operation on 144.39 MHz below ... the FCC requires you to monitor the frequency in a non-CTCSS mode prior to transmitting. And, if you have your 144.39 MHz receiver locked up on CTCSS decode, your receiver won't hear the packet operations ... Thank you for your time, Neil McKie - WA6KLA
----- Original Message ----- From: Max Slover <[EMAIL PROTECTED]> Date: Wednesday, December 13, 2006 4:58 pm Subject: Re: [Repeater-Builder] Mystery Signal > In case I confused anybody, this is what I am refering > to with APRS and a 100hz tone --- > > VOICE ALERT: This simply means that you do not turn > the audio down on > 144.39, but instead leave it at high volume and then > simply set CTCSS > tone 100 to mute the speaker. This way, you dont hear > any packets, but > ANYONE can call you with VOICE on 144.39 to alert you > by using PL 100. > You will rarely use this, and only use it to tell > someone to QSY to another > voice channel, but it is one way of assuring that > ANYONE running APRS in > simplex range of you can ALWAYS be contacted with a > voice call... > > You wont hear any packets except maybe one or two > when another VOICE- > ALERT mobile is in range (about 3 miles or so). But > even then, he is only > beaconing once every 2 minutes and so it is not > bothersome at all.. > In fact, it is nice to hear when someone is nearby! > Its like a free radar > for other mobile APRS operators that are in simplex > range AND listening. > > --- > > --- Max Slover <[EMAIL PROTECTED]> wrote: > > > Doh, this just hit me. It would most definitely be > > an > > APRS setup due to the 100hz subtone. In APRS you set > > the subtone to 100 so you can do voice alert. Man, > > why > > didn't I think of that part when this was first > > mentioned. > > > > Sorry for being a bit late on that but I figured I'd > > toss my 2 cents on this. > > > > Max... > > > Public Information Officer -- St. Louis & Suburban Radio Club > K0AZV - Amateur > WPWH-650 GMRS > St. Louis County ARES > St. Ann MO EM48tr > > > > > > Yahoo! Groups Links > > > >
