Too many GPS puck antennas

Originally Posted by

On Friday, January 10, 2020 at 9:22:22 PM UTC-5, Charles Longley wrote:
I just started pimping out my ASW20. I am putting in a LXNAV S100, FLARM and an ADS-B Trig transponder. Thant’s three puck antennas and I haven’t even figured out where to put the FLARM antennas yet! Does anyone have a good solution?

Too many puck GPS antennas too close together will lead to interference and poor function.
I remember reading somewhere that these puck antennas must be 30 inches apart to help reduce the possibility of such interference.

What about compass interference with all those magnets and metal ?
I have one that I moved around the compass but seemed to not affect it .

On Saturday, January 11, 2020 at 5:43:09 PM UTC-8, Delta8 wrote:
;1007977 Wrote:
On Friday, January 10, 2020 at 9:22:22 PM UTC-5, Charles Longley
wrote:-
I just started pimping out my ASW20. I am putting in a LXNAV S100,
FLARM and an ADS-B Trig transponder. Thant’s three puck antennas and I
haven’t even figured out where to put the FLARM antennas yet! Does
anyone have a good solution?-

Too many puck GPS antennas too close together will lead to interference
and poor function.
I remember reading somewhere that these puck antennas must be 30 inches
apart to help reduce the possibility of such interference.

What about compass interference with all those magnets and metal ?
I have one that I moved around the compass but seemed to not affect it





--
Delta8

Compass? We don't need no stinkin compass. ;-)

7Q

Pfft compass what’s that? Look out the canopy.

Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there are mountains
to guide you. In Kansas, look at the GPS track when you want to know direction. Or
pull out your iPhone, and use the compass app.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

....or just look at the section lines on then ground.Â* If the sun is
shining, it's pretty easy to guess the cardinal directions.

On 1/11/2020 8:58 PM, Eric Greenwell wrote:
Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there are
mountains to guide you. In Kansas, look at the GPS track when you want
to know direction. Or pull out your iPhone, and use the compass app.


--
Dan, 5J

On Sunday, January 12, 2020 at 8:27:19 AM UTC-8, Dan Marotta wrote:
...or just look at the section lines on then ground.Â* If the sun is
shining, it's pretty easy to guess the cardinal directions.

On 1/11/2020 8:58 PM, Eric Greenwell wrote:
Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there are
mountains to guide you. In Kansas, look at the GPS track when you want
to know direction. Or pull out your iPhone, and use the compass app.


--
Dan, 5J

Garmin's only precaution about the placement of multiple GPS antennas is the potential effect of one antenna shadowing another:

3c. To minimize the effects of shadowing at 5° elevation angles, the GPS antenna should be mounted no
closer than 6 inches (edge to edge) from other antennas, including passive antennas such as another
GPS antenna or XM antenna.

http://static.garmin.com/pumac/GA35G...structions.pdf

And if you want to share a single antenna with multiple instruments you can get a splitter (albeit not cheaply!):

https://www.gpssource.com/collections/gps-splitter

Tom

On Sunday, January 12, 2020 at 11:48:42 AM UTC-8, 2G wrote:
On Sunday, January 12, 2020 at 8:27:19 AM UTC-8, Dan Marotta wrote:
...or just look at the section lines on then ground.Â* If the sun is
shining, it's pretty easy to guess the cardinal directions.

On 1/11/2020 8:58 PM, Eric Greenwell wrote:
Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there are
mountains to guide you. In Kansas, look at the GPS track when you want
to know direction. Or pull out your iPhone, and use the compass app.


--
Dan, 5J

Garmin's only precaution about the placement of multiple GPS antennas is the potential effect of one antenna shadowing another:

3c. To minimize the effects of shadowing at 5° elevation angles, the GPS antenna should be mounted no
closer than 6 inches (edge to edge) from other antennas, including passive antennas such as another
GPS antenna or XM antenna.

http://static.garmin.com/pumac/GA35G...structions.pdf

And if you want to share a single antenna with multiple instruments you can get a splitter (albeit not cheaply!):

https://www.gpssource.com/collections/gps-splitter

Tom

Here is a cheaper splitter:

https://timemachinescorp.com/product...hoC4g8QAvD_BwE

Tom

Dan Marotta wrote on 1/12/2020 8:27 AM:
....or just look at the section lines on then ground.Â* If the sun is shining, it's
pretty easy to guess the cardinal directions.

On 1/11/2020 8:58 PM, Eric Greenwell wrote:
Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there are mountains
to guide you. In Kansas, look at the GPS track when you want to know direction.
Or pull out your iPhone, and use the compass app.

If the sun is shining around noon or even somewhat later, it's mostly overhead.
It's really easy to pop out of a thermal and head off at 90 degrees to course.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

Ya got me there, Eric!Â* It's been decades since I've not seen mountains.

On 1/12/2020 9:26 PM, Eric Greenwell wrote:
Dan Marotta wrote on 1/12/2020 8:27 AM:
....or just look at the section lines on then ground.Â* If the sun is
shining, it's pretty easy to guess the cardinal directions.

On 1/11/2020 8:58 PM, Eric Greenwell wrote:
Charles Longley wrote on 1/11/2020 6:59 PM:
Pfft compass what’s that? Look out the canopy.

Not a good option in Kansas! You are spoiled by flying where there
are mountains to guide you. In Kansas, look at the GPS track when
you want to know direction. Or pull out your iPhone, and use the
compass app.

If the sun is shining around noon or even somewhat later, it's mostly
overhead. It's really easy to pop out of a thermal and head off at 90
degrees to course.


--
Dan, 5J

Play around with positioning.Â* If you want to try the glued on washers
with magnetic antennae, try installing them as far back or as far
forward on the canopy rails as you can.Â* My Stemme is very wide so my
pucks are far away from the panel.



On 1/11/2020 5:48 PM, Delta8 wrote:
;1007977 Wrote:
On Friday, January 10, 2020 at 9:22:22 PM UTC-5, Charles Longley
wrote:-
I just started pimping out my ASW20. I am putting in a LXNAV S100,
FLARM and an ADS-B Trig transponder. Thant’s three puck antennas and I
haven’t even figured out where to put the FLARM antennas yet! Does
anyone have a good solution?-

Too many puck GPS antennas too close together will lead to interference
and poor function.
I remember reading somewhere that these puck antennas must be 30 inches
apart to help reduce the possibility of such interference.
What about compass interference with all those magnets and metal ?
I have one that I moved around the compass but seemed to not affect it
.





--
Dan, 5J