Iwo Mergler wrote:
Kevin Neave wrote:

Hi Folks,

Does anyone out there know if there are any adverse
effects of mounting two or more GPS antennae in close
proximity?


Yes, if the antennas are within (roughly) one wavelength,
there can be interference. That would be 20cm or so.

It depends very much on the antennas (patch/helix, active/passive)
and on the receiver itself.

In general, active antennas will be better neighbors.
However, I have once encountered a GPS antenna which
started to oscillate when it got cold and effectively
jammed 8 other antennas within a meter radius.

Unless you want more than one antenna for redundancy, the
classic way to handle this is to use a single high-gain
active antenna and a RF power splitter.

For example, the device at th bottom of this page:
http://www.procom-dk.com/component/d...ower-splitters
into the cable by the GPS receiver.

Is there a device that allows two aircraft transceivers to use one antenna?


--
Eric Greenwell - Washington State, USA
Change "netto" to "net" to email me directly

"Transponders in Sailplanes" on the Soaring Safety Foundation website
www.soaringsafety.org/prevention/articles.html

"A Guide to Self-launching Sailplane Operation" at www.motorglider.org