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ricksked(at)embarqmail.co
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 Posted: Sun Sep 16, 2007 7:12 am Post subject: Antenna placement and adequate ground plane or ground wi |
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Deems,
You have a pic of that in your RV-10, OSH pics...dry version. Wish we didn't have a plane to catch that day. I could have spent hours combing over Rick's RV.
Rick S.
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Sun Sep 16, 2007 7:50 am Post subject: Antenna placement and adequate ground plane or ground wi |
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I understand you guys (Deems, Zack and Rick) are having an "offline
party discussion" but can you share the photos of Rick's OSH aircraft
for everyone? The suspense can be fatal.
The comment was made yesterday about antenna performance so someone was
seeing the direction I was pointed. Which was well placed because many
finished RV-10s should be running with diminished avionics performance
and just don't know better. I think Tim has now seen the light (or was
that the color) with his WSI 300 antenna. Fiberglass is not transparent
to RF it creates a false positive and measurable signal loss. It is
only translucent with a clearly diminished performance. It also requires
your output amp to work significantly harder leading to earlier
potential failure and often a loss of valuable communication when you
need it most - rain fade, cloud obscuration and turbulence.
"I see said the blind man as he picked up his hammer and saw". Where
are the avionics guys when we need some real illumination on the subject
of placement and installation technique? You guys should try talking to
L3 on traffic reporting if you are missing the direction.
John C.
Do not archive
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zackrv8
Joined: 14 Jan 2006
Posts: 133
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| Posted: Sun Sep 16, 2007 5:16 pm Post subject: Re: Antenna placement and adequate ground plane or ground |
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[quote="AV8ORJWC"]I understand you guys (Deems, Zack and Rick) are having an "offline
party discussion" but can you share the photos of Rick's OSH aircraft
for everyone? The suspense can be fatal.
OK John,
Here some shots I took of Rick's plane at OSH. You can also view more at the link below.
Zack
http://rickygray.myphotoalbum.com/view_album.php?set_albumName=album04
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_________________
RV8 #80125
RV10 # 40512 |
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LloydDR(at)wernerco.com
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| Posted: Mon Sep 17, 2007 9:02 am Post subject: Antenna placement and adequate ground plane or ground wi |
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You know the funny thing about fiberglass and receivers? Just about
every antenna is enclosed in one. All radomes are fiberglass because of
their weight, they even use the same honey comb we have in the cowls,
and the size of the signal a radar is receiving is much smaller than the
GPS signal we are talking about. What is important is the paint or
surface protection that goes on. It is fine and expected for an antenna
to be placed under fiberglass as it is RF transparent, what is not
transparent is any kind of contamination, IE moisture in the resin,
moisture in the honey comb, metal flake or contaminants in the paint or
surface protection. Drive around an airport, military base, weather
station etc, all of those white ball looking things are antenna
enclosures, and guess what they are fiberglass!
Every antenna I worked on in the military was enclosed in a fiberglass
housing, VHF, UHF, HF and yes even our GPS antenna's were in housings to
prevent corrosion from salt spray. What we had to be careful of was
water impregnation, and not painting the enclosures with unapproved
paint.
Clean, pure Fiberglass and resin does nothing to attenuate RF. Poor
installation, poor/ unclean mixing of chemicals, painting and more
importantly structure masking impact antenna performance...
Dan
N289DT RV10E
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kdbelue(at)charter.net
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| Posted: Mon Sep 17, 2007 3:43 pm Post subject: Antenna placement and adequate ground plane or ground wi |
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I mounted my Garmin 196 GPS antenna under the top cowling in my RV-6A. It
worked fine, although there was some attenuation - which was ok since this
was a VFR application. Then I painted my plane with metallic paint on top of
the cowling and the GPS no longer received enough signal to work, so I moved
the antenna. I don't like having antennas hanging out on the plane, but on
my RV-10 the GPS antennas are outside on the top. The GPS antenna may work
ok under the cowling as long as no metallic paint is over it, but I don't
want anything to attenuate the signal since this will be used for IFR
flying.
Kevin Belue
RV-6A N97KB
RV-10 finishing
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