I forgot to mention the circuit I suggested below is known as a
phase shift oscillator.
Neil
Neil McKie wrote:
>
> Using 1 transisitor and a few resistors and capacitors will do
> as well.
>
> Neil - WA6KLA
>
> Mike WA6ILQ wrote:
> >
> > At 09:54 PM 10/17/04, you wrote:
> >
> > >Sounds like that kind of duty cycle would just help the battery run down
> > >more quickly. You might consider that type of automatic signal may not be
> > >appropriate for the service. Maybe you just need a beep after repeater
> > >activity? Maybe something with a 555 timer could be built up?
> >
> > Please don't use a 555 - they output square waves ....
> > which sounds bad and if the TX audio filtering / deviation
> > control isn't what it should be they will cause adjacent
> > channel interference.
> >
> > A simple sine wave audio oscillator is not that difficult - a
> > transistor, a audio transformer, and a few resistors and
> > capacitors.
> >
> > In my initial response I didn't suggest keying the TX PL
> > encoder simply because that may already be in use, and
> > using it for a power fail alert requires hooking some kind
> > of an alarm to a PL decoder somewhere.
> >
> > My offer to engineer a real solution still stands - just get
> > me a RICK manual or a copy.
> >
> > Mike WA6ILQ
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> Yahoo! Groups Links
>
>
>
>
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