>>> OK Tech-Guy, got a schematic for a simple tone generator
 >>> I can use in my FM rig to open the repeater? Only needs to
 >>> generate ONE tone, at 146.2 Hz. I could swap in different
 >>> resistors with DIP switches for other tones, if it used an RC
 >>> time constant or Resistive biasing of a chip to determine the
 >>> frequency.
 >  JE>
 >>> My technical background says it SHOULD BE SIMPLE! But my
 >>> foggy memory can't remember the details...
 >  JE>
 >  JE> Should be simple enough to build something, with a 555 IC, and R/C
 >  JE> component to obtain the frequency.
 > Two transisters linked for feedback works just fine.
 > Got the schematic here somewhere, just need to dig it up.
hey, that would be GREAT Roy!  post it in here, if you can find it, alright?
 >  JE> However you decide to come up with the actual tone, remember to
 >  JE> inject it at the CARRIER level, and not in the audio section.
 > In the deviation section is better.  You can tell when
 > the tone is right by the amount of deviation in the carrier...
As long as it's not sent in through the audio section, there's no need to 
worry about it getting filtered out, later down the chain.  That the audio 
was getting filtered
through limiters, etc - passing the subaudible was my only concernd.
 > JE> Remember to keep the ouput low enough to not be heard by human ears,
 > JE> yet detectable by the repeater reciever.  They're -supposed- to be
 >  JE> sub-audible ;-)
 > 146.2hzs and higher is audible no matter the output.
Probably true - but still low enough to not bother anyone.
   73 = Best Regards
   -Jeff KA5THB
   ka5thb@bigfoot.com
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