I think you are probably correct. I do remember that the 2 PL tones had to be about the same level. If one PL tone was at a significantly higher level then the other, then the lower level tone was unable to decode. It was also important that the tones not be close or harmonicly related; 100 Hz and 103.5 Hz or 100 Hz and 151.4 were NOT good choices. Good choices were 100 Hz and 131.8 Hz or 100 hz and 162.2 Hz. The situation I was in required that 100 Hz be one of the PL tones, the other tone could be anything.
------ Original Message ------ Received: Sun, 20 Jul 2008 12:10:23 PM PDT From: Ron Wright <[EMAIL PROTECTED]> To: [email protected] Subject: Re: Re: RE: [Repeater-Builder] Re: PL Problem > John, > > I've wondered about multi-PL tones at one time. > > I am sure with the older reeds not a problem, but newer IC type usually take in the PL, strip off the higher freq audio leaving only the PL and then feed to a pin that I am sure is counting the period or doing some period averaging. The Comm Spec TS64 has to be this way for they use a 6800 ventage CPU for their decoder. > > If 2 PLs were present this would have a wierd wave form and bet might not decode. I've never tried it, but would be interesting to try. > > I have used multi-PLs on a single rcvr for control and other purposes, but never at the same time. > > 73, ron, n9ee/r > > > > > > >From: JOHN MACKEY <[EMAIL PROTECTED]> > >Date: 2008/07/20 Sun PM 02:58:29 EDT > >To: [email protected] > >Subject: Re: RE: [Repeater-Builder] Re: PL Problem > > > > >You are correct, a good rig will have a PL filter so you don't hear it. But > >many of these newer Yae-com-wood radios don't seem to have adequate > >filtering. > > > >So I try to run my repeater PL tone at about 450 Hz, which has worked well. > > > >I know that 15 years ago I set up a GE Mastr Pro repeater with dual PL > >encoding on the transmitter for a special project. I put each (comm-spec) PL > >encoder at 350 Hz deviation and every decoder was able to lock up. Two PL > >tones deviating at 350Hz each gave me about 750 Hz PL deviation on the > >repeater transmitter. I had to build a filter network to roll off the sum of > >the PL tones; 100 Hz and 146.2 Hz wanted to produce a third PL tone. So I > >built a filter network which started to roll off every thing above 200 Hz > >before it went in to the modulator stage. > > > >I do remember testing with various decoders and found that going below 300 Hz > >PL deviation made decoding unreliable. > > > >------ Original Message ------ > >Received: Sun, 20 Jul 2008 11:47:12 AM PDT > >From: Ron Wright <[EMAIL PROTECTED]> > >To: [email protected] > >Subject: Re: RE: [Repeater-Builder] Re: PL Problem > > > >> A good rig has a PL filter so you don't hear it, but know it comes thru on > >some rigs. Does sound annoying when it does. > >> > >> Also need to remove from the repeater receiver for it might beat with the tx > >generated PL due to it being slightly different freq/phase. Most rigs will > >not pass low freq PL thru their audio input. This is why most rigs have > >seperate input for PL encode. > >> > >> 73, ron, n9ee/r > >> > >> > >> > >> >From: JOHN MACKEY <[EMAIL PROTECTED]> > >> >Date: 2008/07/20 Sun PM 02:37:13 EDT > >> >To: [email protected] > >> >Subject: RE: [Repeater-Builder] Re: PL Problem > >> > >> > > >> >I set all my repeaters for 450 Hz to 550 hz and have never had a problem > >with > >> >listeners being able to decode. > >> > > >> >so something in the range that David suggests below should be fine. > >> > > >> >I know some people who think PL level should be set at 750 hz to 900 hz. > >In > >> >my opinion, that is way to high, and it is annoying to hear the PL tone > >which > >> >can be done at those levels. > >> > > >> >------ Original Message ------ > >> >Received: Sun, 20 Jul 2008 06:45:05 AM PDT > >> >From: "David Murman" <[EMAIL PROTECTED]> > >> >To: <[email protected]> > >> >Subject: RE: [Repeater-Builder] Re: PL Problem > >> > > >> >> Run all my repeaters with a tone of 600 hz. This is what GE recommended > >> >when > >> >> I was in the 2-way business. So far all three repeaters, two VHF and > >one > >> >> UHF have had no problem with any radio being able to decode the tone. > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> David > >> >> > >> >> > >> >> > >> >> -----Original Message----- > >> >> From: [email protected] > >> >> [mailto:[EMAIL PROTECTED] On Behalf Of nj902 > >> >> Sent: Saturday, July 19, 2008 9:37 PM > >> >> To: [email protected] > >> >> Subject: [Repeater-Builder] Re: PL Problem > >> >> > >> >> > >> >> > >> >> Actually, what I think what I confirmed is that I passed reading > >> >> comprehension... > >> >> > >> >> > >> >> The "Standard" is 500 to 1000 Hz . Period. > >> >> > >> >> ................................................................. > >> >> > >> >> --- In Repeater-Builder@ <mailto:Repeater-Builder%40yahoogroups.com> > >> >> yahoogroups.com, "Eric Lemmon" <[EMAIL PROTECTED]> > >> >> wrote: > >> >> > >> >> " My statement about the definition of "Standard CTCSS Modulation" is > >> >> correct, and thank you for confirming that. ..." > >> >> > >> >> > >> >> > >> >> > >> > > >> > > >> > > >> > >> > >> Ron Wright, N9EE > >> 727-376-6575 > >> MICRO COMPUTER CONCEPTS > >> Owner 146.64 repeater Tampa Bay, FL > >> No tone, all are welcome. > >> > >> > >> > > > > > > > > > Ron Wright, N9EE > 727-376-6575 > MICRO COMPUTER CONCEPTS > Owner 146.64 repeater Tampa Bay, FL > No tone, all are welcome. > > >
