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
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