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[aprssig] In car power solution for GPS 18

Andrew Rich vk4tec at tech-software.net
Sun Aug 13 00:28:52 UTC 2006


MessageWe had a bad day for weather here.

It seems to be doing ok now, I have moved it on the dash a bit.

Seems the winscreen wipers were shielding it.

Thanks for your help

-----------------------------------------
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec at tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA

  -----Original Message-----
  From: KENT HUFFORD [mailto:khufford at comcast.net]
  Sent: Sunday, 13 August 2006 9:28 AM
  To: vk4tec at tech-software.net; 'TAPR APRS Mailing List'
  Subject: RE: [aprssig] In car power solution for GPS 18


  I have a GPS18 (PC version) When I turn the car on, it finds the sats and
comes up in about 15 sec. The GPS is on the ACCESSORY line, so it has not
had any power to it.

  Go to the GARMIN web site and look at the technical specs on the 18. It
has almanac backup for up to 6 MONTHS built in.

  Something is not right with yours, unless the car has been moved a 1000
miles between times the GPS was last on.

  There are a bunch of ROM flash upgrades on the GARMIN site for the 18
also.

  Kent
  KQ4KK
    -----Original Message-----
    From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Andrew Rich
    Sent: Saturday, August 12, 2006 5:58 AM
    To: TAPR List
    Subject: [aprssig] In car power solution for GPS 18


    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
    -----------------------------------------
    Andrew Rich
    Amateur radio callsign VK4TEC
    email: vk4tec at tech-software.net
    web: http://www.tech-software.net
    Brisbane AUSTRALIA

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