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.
