GPS Out of service??

On Wed, 27 May 2009 05:49:34 -0700, dan_the_writer wrote:

Do you normally fly with two GPS systems,
or just when you're getting ready for a contest? Running them from
different power systems, and separating the cabling and antennae may
cure the problem.

I normally fly a Std Libelle with two GPS receivers in the UK:

1) a Garmin GPS II+ on the battery box lid driving my EW model D.
This is powered from both batteries via diodes for auto power switch.

2) a GPS in a flexi-mount on the panel, powered directly from one of
the batteries. Up to the end of last season this was a Garmin
GPS II+ with an external active antenna mounted in front of the panel.
This season its been replaced by a Binatone X.350 PNA (internal
antenna) mounted and powered the same way.

I have never had a loss of signal during the three years I've been using
this setup.

HTH


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

On May 27, 7:49*am, wrote:
On May 27, 7:49*am, wrote:





On May 25, 7:44*pm, "BT" wrote:

are they using different antenna?
did you notice a power problem in the glider?

Maybe you flew through and area of GPS Jamming.
Different Jamming techniques will do different things, from totally denying
reception of GPS signals.. to tweaking the reception to make you think you
are going one way.. when the GPS is actually taking you off track

wrote in message

....

On my last two flights at Marfa Texas May 24 and May 10 I have lost
GPS navagation fixes for a few minutes on both flights. *I have two
GPS receivers (cambridge GPS/Nav and a lx-7000) both units lost their
fix at the same time and came back together. *Both flights are up on
the OLC if you want details. *Anyone else have the same experience?
Is it anything I can fix?

BillSnead
6W- Hide quoted text -

- Show quoted text -

No ne else flying in the area except Burt who was giving rides. *The
reason for the post was to see others had the same outage. *I plan on
flying contests soon, therefore I was wondering about my equipment -
power ect.

Bill- Hide quoted text -

- Show quoted text -

Another thought - I have had interference from my old cell phone to my
Volkslogger. *Shutting down the cell immediately increased the number
of satellites available... *I also wonder if the two GPS systems are
interfering with one another. *Do you normally fly with two GPS
systems, or just when you're getting ready for a contest? *Running
them from different power systems, and separating the cabling and
antennae may cure the problem.

I have a background in nav system electro-magnetic compatibility/
interference (EMC/EMI) flight test...- Hide quoted text -

- Show quoted text -

This outage problem was solved when I moved the two GPS antennas away
from each other.

Bill Snead