The earliest reference I can find in my Motorola paperwork is for a P-9303
Single Tone Oscillator Decoder schematic, dated 6/12/59.
However, these are not PL tones, looks like tone-burst instead, listed freq.
range is 600-3200 Hz.
BTW, tone burst is used a lot on places like Europe on VHF/UHF
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
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
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