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[aprssig] Suggestions for Automatic Power Off/Power On circuit for mobile rigs?

Curt, WE7U archer at eskimo.com
Tue Nov 15 20:53:27 UTC 2005

On Tue, 15 Nov 2005, James Jefferson Jarvis wrote:

> > I'd also like to have my GPS powered off, as well, since it draws about
> > 100ma, and I'd like to keep battery drain to an absolute minimum,
> > especially when it's -30 degrees out.  Therefore, using the rig's
> > built-in APO is possible, but that doesn't help me with the GPS.
> I've used small reed relay that sucks power from the Kenwood TM-D700
> microphone connector to power the GPS on and off. That way the GPS is on when
> the radio is on only. On the Kenwoods there is 8 volts @ ~100mA on the
> microphone RJ-45 connector.

So how come you're not recommending the one you came up with James?
I run that APO in my Jeep and it works just fine.  Shuts everything
down something like 15 minutes after it hits the low-voltage
trigger.  Turns the equipment on some few seconds after the Jeep
starts up.

Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
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