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[aprssig] Garmin GPS 18 question

Gary n6lrv at cox.net
Wed Sep 14 00:43:21 UTC 2005


sorry, that should read "... would NOT operate or communicate...".
Gary

Gary wrote:

> One other little known fact is if you let your power supply to the GPS18
> drift below 4.7Vdc then it will freeze up on the next memory write. The
> memory writes happen periodically and are not displayed in any way. This
> really does happen. As one of the first in this group to use a GPS18 I found
> out first hand how voltage sensitive the GPS18 is. Using a common 9V battery
> as a power source (via a solid state 5V regulator) mine eventually and slowly
> ran down until it reached the minimum threshold of the regulator (about 7Vdc)
> then the regulator's output dropped accordingly. In short order the GPS18
> locked up and would operate or communicate. Garmin replaced it under warranty
> but getting answers from Garmin took hours of calling and digging. I finally
> got a service manager to explain the problem. They realize this shortcoming
> in the GPS18's design but they won't be correcting it. I have also been using
> the GPS15H which has internal regulation but it is not packaged the same way
> and it requires an external antenna.
> Gary
>
> clayj at nwlink.com wrote:
>
> > The regulator is in the lighter plug - there's a VERY specific warning on
> > either the GPSCity (where I actually ordered my LVC) or Garmin web site.
> >
> > If you put ANYTHING over 5V on the LVC, you'll fry it.
> >
> > Clay
> > N7QNM
> >
> > > Scott I have the LVC model, i hav a reg in line
> > >
> > > I think they have a reg in the cigarette lighter. do not quote me tho
> > >
> > > -----Original Message-----
> > > From: aprssig-bounces at lists.tapr.org
> > > [mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Scott Miller
> > > Sent: Wednesday, 14 September 2005 5:50 AM
> > > To: TAPR APRS Mailing List
> > > Subject: [aprssig] Garmin GPS 18 question
> > >
> > >
> > > I see that the GPS 18 PC takes up to 30 volts.  Does anyone know if the
> > > regulation is done in the unit itself, or is it in the cable?  In other
> > > words, if you cut off the cable, is the PC the same as the LVC version?
> > >
> > > Scott
> > > N1VG
> > >
> > >
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> > >
> > >
> > >
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> > >
> > >
> >
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>
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