Remi,
Just my 2. If you ask the Garmin folks they will insist that you not shorten
the
wire. As such, just loop the excess and tuck it away under your instrument
panel.
Many years ago I upgraded an original Garmin to WAAS and the replacement antenna
came with about 4 meters of cable. The instructions forbade any attempt to
shorten the cable as it would negatively impact the signal from the antenna.
So even though a meter of cable would have been more than sufficient to go from
the Garmin to the antenna perched on the top of the instrument panel, I had
to loop the other 3 meters and tuck inside the panel.
Im going to guess about why. It may be because many GPS antennas are powered
and
have electronics associated with the antenna. The cable length may be to
provide
proper impedance matching from radio to antenna electronics. Any other
comments are welcome.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop (100 hrs).
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP, Hercules Prop.
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Mar 17, 2018, at 8:55 AM, Remi Guerner <air.guerner@orange.fr> wrote:
This is a question for avionics gurus. After one full year of good service, my
G5 EFIS with its enabled internal GPS antenna started to display wrong attitude
information. After talking to the G3X team at Garmin, a software update fixed
the issue, but after reviewing the recorded data of one of my flights, they
came back to me and suggested I install an external antenna to improve the GPS
reception. So I purchased a GA26C antenna (picture attached). The antenna comes
ready for use with an 8 ft cable and BNC connector. I need only 2 ft to install
the antenna on top of the instrument panel, therefore my questions: performance
wise, is there an inconvenience to install the antenna as it is and attach
the loops of extra cable length together? Is it worth cutting the extra length
and install a new BNC connector? Would that reduce possible losses and/or
susceptibility to electromagnetic interferences ?
Remi Guerner
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