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1. 02:29 AM - Re: Avionics-List Digest: 1 Msgs - 03/05/03 (Martini Luc J.R.)
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| Subject: | Re: Avionics-List Digest: 1 Msgs - 03/05/03 |
--> Avionics-List message posted by: "Martini Luc J.R." <martini@foxinternet.net>
No doubt there are people out there with specific aircraft experience, and
the Trial and Error method ultimately is the best guide of what NOT to do.
However, a few general rules that you will find in most installation manuals
should be adhered to.
Keep away by several feet or as far as possible from other radiating
antennas.
Try to mount the antenna in the "electrical center of mass", i.e. dab smack
in the middle of the largest unbroken concentration of metal you can find...
usually the belly (but that has it's own problems to consider- you can
loose signal on the ground or in high angles of attack; and the antenna is
more subject to damage). On composite fuselage aircraft, you will need to
build a GROUND PLANE. There are several ways of doing that; Metal Disk,
Wire Radials, or Mesh Wire Patch. A old "sparks" amateur radio operator
will be more usefull to you than any other group of people I can think of in
considering how to best accomplish that and test the results before you
start drilling holes in that composite skin.
On metal aircraft stay well away from and/or up-wind of NON METALIC surfaces
such as windshields, radomes, etc. (they create static).
BONDING BONDING BONDING....practice good bonding technique. Clean the
mounting surface of paint, alodine the skin...where the antenna will mount &
make contact. Be sure the Mounting Studs/Screws, also have a low resistance
path. Put Static Discharge wicks on the trailing edge flight control
surfaces (may also save your butt if you get hit by lightning the wicks will
vaporize instead of a piece of your trailing edge). Put bonding wires
between structure and moveable surfaces (static discharge source --
lightning protection)
Use Double Shielded Coax, and milstandard (silver coated) coax connectors.
Keep the run length to a minimum, (every db of signal loss to the cable is a
loss in effective range) and DO NOT run the coax along the same path as the
Transponder and DME coaxes. Where these meet, cross at a 90 degree angle to
avoid signal coupling.
Consider what different antenna TYPES are available for what you want to
do, Each has strengths and weaknesses.
There certainly are other things you can do to make your radios / antennas
work optimally.. By these should give you more than enough to consider.
Luc
----- Original Message -----
From: "Avionics-List Digest Server" <avionics-list-digest@matronics.com>
Subject: Avionics-List Digest: 1 Msgs - 03/05/03
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> Total Messages Posted Wed 03/05/03: 1
>
>
> Today's Message Index:
> ----------------------
>
> 1. 09:51 AM - Nav Antennae (larry OKeefe)
>
>
> ________________________________ Message 1
_____________________________________
>
>
> Time: 09:51:01 AM PST US
> From: "larry OKeefe" <okeefel@adelphia.net>
> Subject: Avionics-List: Nav Antennae
>
> --> Avionics-List message posted by: "larry OKeefe" <okeefel@adelphia.net>
>
> Building an RV7A with tip tanks. Any suggestions on placement of Nav
antennae.
> should it be in Vertical stabilizer or outer wing area
> Larry OKeefe RV7A wings
>
>
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