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[aprssig] In car power solution for GPS 18

John Gleichweit smokeybehr at sbcglobal.net
Sat Aug 12 21:25:50 UTC 2006


I agree. Most GPS units take such a miniscule amount of power that it would
take several days of operation to run the battery down. If you do want to
run an auxiliary battery to run just the GPS, and possibly the TNC and XCVR,
then you'd need a charge regulator like what West Mountain has.
http://www.westmountainradio.com/SuperPWRgate.htm has all the charging
circuitry to keep from overcharging the battery.

--
John "Smokey Behr" Gleichweit FF1/EMT, CCNA, MCSE
IPN-CAL023 N6FOG UP Fresno Sub MP183.5 ECV1852
List Owner x6, Moderator x4 CA-OES 51-507
http://smokeybehr.blogspot.com
http://www.myspace.com/smokeybehr

-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Dale Blanchard
Sent: Saturday, August 12, 2006 11:53 AM
To: vk4tec at tech-software.net; TAPR APRS Mailing List
Subject: Re: [aprssig] In car power solution for GPS 18


Andrew Rich wrote:
> Gudday
>
> When I jump in my car, my GARMIN GPS18 (5volt version) takes a while to
> lace up on the sats. (because it has been off)
>
> I am wondering if I can throw a gell cell battery in there and charge it
> while the car is running. (and GPS going when the car is off)
>
> Now I need to know
>
> 1) Should there be a diode in line ?
> 2) Should there be a resistor to limit current to battery on charge ?
> 3) Any low voltage cutout ideas ?
>
> Cheers
Why don't you just leave the GPS powered all the time.
I leave mine on all the time.
Even on a trip with my motorcycle with a smaller battery.
It will take a long, long time to run the battery down.
WA7IXK

dale


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