IIRC QC was RCA trademark and CG was GE trademark for CTCSS. Johnson used ToneGuard for their trademark.
73 Glenn WB4UIV At 05:39 PM 12/15/06, you wrote: >I always thought it was known as "QC" for Quiet Channel or "CG" for Channel >Guard. > > > >------ Original Message ------ >Received: Thu, 14 Dec 2006 10:43:53 AM CST >From: [EMAIL PROTECTED] >To: [email protected] >Subject: [Repeater-Builder] Newbie Information Time - Mystery Signal > > > > > 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 > > > > > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > >
