At 10:24 AM 09/21/09, you wrote: >Started doing some research. > >If you want to see a scary search go to the USPTO and look at all the >words Motorola has trade marked over the years. It's almost the size >of the new speak dictionary. > >The the term "Private-Line" was issued in 1976, but is no longer an >active trade mark. Looks like it was canceled after 6 years and not >renewed. > >"Vibrasponder" and "Vibrasender" were issued in 1955 but are also >considered dead, not sure when they were canceled. > >Found these patents issued to Motorola that may be intresting: > >http://www.google.com/patents/download/SELECTIVE_CALLING_SYSTEM.pdf?id=hoFRAAAAEBAJ&output=pdf&sig=ACfU3U0ID3xNtKITrFOSjudbtZqbACKYVA&source=gbs_overview_r&cad=0 > >http://www.google.com/patents/download/VIBRATING_REED_CONTROLLED.pdf?id=ioFRAAAAEBAJ&output=pdf&sig=ACfU3U2aiaRzmTCYYspbRZr9YGM8rKCNqQ&source=gbs_overview_r&cad=0 > >http://www.google.com/patents/download/SELECTIVE_SIGNALING_SYSTEM.pdf?id=VB5oAAAAEBAJ&output=pdf&sig=ACfU3U191hc0-cyfTEjoNQ-q4STmizi1pA&source=gbs_overview_r&cad=0 > >http://www.google.com/patents/download/SQUELCH_SYSTEM.pdf?id=5F5xAAAAEBAJ&output=pdf&sig=ACfU3U0fn8ZYd0DxgmR-gwXzNImgpoZ82g&source=gbs_overview_r&cad=0 > >Still couldn't find a list of PL tones in any of them so then I did a >search on EIA PL Tones and found this page: > >http://www.geocities.com/euro446/ctcss.html > >It lists the EIA Group A tone set as: > >67.0 >77.0 >88.5 >100.0 >107.2 >114.8 >123.0 >131.8 >141.3 >151.4 >162.2 >173.8 >186.2 >203.5 >218.1 >233.6 >250.3 > >Maybe this is the set you are looking for?
Actually, no, but I appreciate the effort. From the draft article: >The overall system is designed around a specific set of low frequency >tones ranging from about 65 Hz to about 250 Hz. The oldest list that I >am aware of (from November 1952) is ten tones: 100.0 cps, 110.9 cps, >123.0 cps, 136.5 cps, 151.4 cps, 167.9 cps, 186.2 cps, 206.5 cps, >229.1 cps and 254.1 cps, identical to tones 1Z through 0Z in the >Motorola standard tone list. Over the years the list has been expanded - by >1965 Motorola was using 26 tones from 82.5 to 192.8 Hz, and by 1983 >the MSF5000 station offered 42 tones in it's list. These days, and >depending on which industry "standard" set you chose to use, there >are 32, 37, 38, 41, 42, 47 or 50 tones available, and the U. S. >Military has their own unique tone of 150.0 Hz that doesn't appear on >any list of standard Land Mobile tones.
