[SOC] PL / CTCSS Encoder Schematic?

[Bob Nielsen]

I remember around 1980 or so one of the Los Angeles repeater went PL. 
A friend of mine didn't have an encoder, so he made a relaxation
oscillator with a NE-2 neon bulb.  A very second-class solution (not
exactly a sine wave)!

Bob, N7XY

On Sat, Jul 27, 2002 at 09:16:37PM -0500, Rob Mathery wrote:
> Does anyone know where I can dig up a schematic for a PL / CTCSS encoder?
> Local repeater on 146.835 had to turn the tone on because of the boneheads
> using the St. Louis repeater on that frequency that don't quite obey that
> "minimum power" rule.  I turn down my power when I can hear myself keying
> their repeater, why can't they do the same?  AARRGH!  Not only that, but for
> some reason the heat in the shed the repeater is housed in gets up to about
> 110 degrees and breaks open the squelch.  It's a commercial deal with a
> couple FM stations that really heat up the room.  Did it on the old repeater
> too oddly enough.
> 
> Doesn't have to be anything fancy, just something that'll generate a tone of
> 123.
> 
> 72/73/oo
> Rob, w0jrm
> 
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-- 
Bob Nielsen, N7XY                          n7xy@n7xy.net
Bainbridge Island, WA  
IOTA NA-065, USI WA-028S