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

James Jefferson Jarvis jj at aprsworld.net
Tue Nov 15 20:30:06 UTC 2005

> 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.


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