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echo: ham_tech
to: MARK MAGILL
from: ROY WITT
date: 1997-08-11 13:05:00
subject: PL Tone Generators: Building One

Hello Mark.
09 Aug 97 18:55, Mark Magill wrote to Roy Witt:
 MM>
 MM>> Does anyone know if the SHAPE of the resulting waveform
 MM>> matters to repeaters, or just the frequency? I have seen
 MM>> several...
 MM>
 RW>> Sine wave, square wave, as long as they're on freq they'll
 RW>> work.  If you've sent me a SASE like I told you to, you'll
 RW>> be getting a couple of square wave encoders...And, no chips
 RW>> involved, just two transistors...
 MM>
 MM>         Thanks, the SASE is in the very stressed-out mail already.
Coming back your way...left here Saturday.
 MM>         BTW, how critical is the frequency, generally? For example,
 MM> our system is set for 146.2 Hz... do repeaters generally need to get
 MM> right down to .2Hz to open? Or is there usually some leeway in your
 MM> experience?
Not very critical at all.  Of course that will also depend on the repeaters 
tone decoder.  Most of the old Motorola's were pretty wide open, which is 
probably why they went to a digital tone.  I'd say, if you were within ñ2hz, 
you'd still be in the repeater.  Although, if you get on the fringe, you 
might find yourself falling out..
... Bulldozers: People who sleep through political speeches.
---------------
* Origin: KB6PI's Antenna Farm * San Diego, CA (1:202/909.10)

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