Avionics News January 2018 - 29

VHF antenna in the same housing. That saved a huge
amount of room on the typical airframe."
The explosive growth of GPS wasn't the only thing
that impacted antenna design. The Federal Aviation
Administration's ADS-B Out mandate also has placed
pressure on airframers and antenna designers to do more
with less fuselage space.
"Our team has come
me up with innovative solutions
solu
luti
tion
onss
to solve these problems
ms in thee form
form of combination/
multiband antennas,"" stated
state
tedd Javier Pacheco, senior
marketing engineer for D
Dayton-Granger.
ayton-Granger. "The VHF/
ADS-B combination antenna
anntenna provides both VHF COMM
and the ADS-B UAT ssignal
ignal in one package."

confusion and frustration to the technician charged with
troubleshooting a "radio" problem.
Regarding their construction, there are basically two
types of antennas in use today: the fiberglass/stainless
steel "whip" antennas like those used for VOR and ELTs,
and the fiberglass rigid antennas, which can come in a
variety of aerodynamic shapes and sizes. For the sake
stor
st
ory,
y, we're
we re not going to cover weather radar and
of thiss story,
as here.
here. They're
Th
satellite broadband antennas
in a league of
their own.
of the
th antenna has a lot
Jeckell also said that the shape of
to do with its ultimate performance..
h said. "Technicians
"Nature loves a straight antenna,"" he
huun up on this point
can get hung
A is for antenna
a
h 'bent' whip
- why is th
the
antenna onn the aircraft's belly
To better understand
nd what
not performing
as well as the
problems can befall th
the
he
perfor
orm
"OWNERS AND TECHNICIANS
straight
antenna
on the top of
typical airframe antenna,
nna
na, let's
a
n
WANT TO PAINT AN ANTENNA
the fuselage?
first look at how it works.
works
ks.
fusselag It's as simple
IN THE FIELD, AND THE PAINT
as the
Please turn your Avionics
onics ffor
or
the physics
phys behind radio
DETUNES THE ANTENNA LIKE
transmissions.
Dummies book to page
ge 47.
transmissio The RF pattern
on the angled belly antenna has
"The antenna takes
NOBODY'S BUSINESS...
a squinted transmission pattern,
the voltage for the
while the straight antenna
desired frequency
has a perfectly torus-shaped
from the radio
transmission
transmitter and
transmissio pattern. Having a
bent
turns it into electricc
ben antenna
antenn is not optimal, but
in many
as designers,
and magnetic
ic
man
any instances
in
we havee to make compromises
waves, respectively.
ectiively.
because of
Conversely, they
thhey
o the location of the
antenna."
also capturee electric
Also, inn some installations,
and magnetic
ic radio
especially on older aircraft,
signals out of the air
extension of the aircraft's landing gear
and convert them
them back into voltage for recovery
geea and flaps can
interfere with the performance of belly-mounted
antennas.
in the receiver."
verr."
beell
That's a lot of responsibility
ponnsi
s bility for a simple piece of
equipment. And therein
ein lies
lie
ies the problem - or at least one
B is for baseplate
of them. Antennas get
et no respect.
resspe
pect.
So you have the right ante
antenna
enn
nna in th
the right place on the
"Most technicians never think about
abbou
outt the
the antennas
ante
an
tenn
nnas
as until
until
airframe,
airframe
me bu
butt th
thee ow
owne
owner/pilot
ner/pilot
/
still com
complains of trouble
they have a problem," Jeckell said. "But since avionics
communicating with air traffic control 10 miles out.
technicians must routinely figure them out and make them
According to Jeckell and Pacheco, the first place to look
work, they need to understand how they work. All the
is where the antenna bonds to the aircraft's ground plane.
pilot knows is his/her radio isn't working properly."
"Any sign of discoloration from the baseplate of the
Jeckell explained that antennas come in three basic
antenna is a sign to check further for corrosion," Pacheco
groups: There are the COMM antennas, which are
said. "If corrosion is present, the baseplate and the
typically VHF. There are the NAV/VOR/glideslope/
fuselage must be cleaned and a fresh coat of sealant must
transponder antennas. And last, but not least, are the GPS
be applied."
antennas. Of course, as mentioned earlier, many of these
Continued on following page
can reside in the same housing, which can add a level of

THE BEST ADVICE
IS TO NOT EVER
PAINT ANY
ANTENNA."

AVIONICS NEWS

*

JANUARY

2018

29



Table of Contents for the Digital Edition of Avionics News January 2018

No label
Avionics News January 2018 - Intro
Avionics News January 2018 - No label
Avionics News January 2018 - Cover2
Avionics News January 2018 - 1
Avionics News January 2018 - 2
Avionics News January 2018 - 3
Avionics News January 2018 - 4
Avionics News January 2018 - 5
Avionics News January 2018 - 6
Avionics News January 2018 - 7
Avionics News January 2018 - 8
Avionics News January 2018 - 9
Avionics News January 2018 - 10
Avionics News January 2018 - 11
Avionics News January 2018 - 12
Avionics News January 2018 - 13
Avionics News January 2018 - 14
Avionics News January 2018 - 15
Avionics News January 2018 - 16
Avionics News January 2018 - 17
Avionics News January 2018 - 18
Avionics News January 2018 - 19
Avionics News January 2018 - 20
Avionics News January 2018 - 21
Avionics News January 2018 - 22
Avionics News January 2018 - 23
Avionics News January 2018 - 24
Avionics News January 2018 - 25
Avionics News January 2018 - 26
Avionics News January 2018 - 27
Avionics News January 2018 - 28
Avionics News January 2018 - 29
Avionics News January 2018 - 30
Avionics News January 2018 - 31
Avionics News January 2018 - 32
Avionics News January 2018 - 33
Avionics News January 2018 - 34
Avionics News January 2018 - 35
Avionics News January 2018 - 36
Avionics News January 2018 - 37
Avionics News January 2018 - 38
Avionics News January 2018 - 39
Avionics News January 2018 - 40
Avionics News January 2018 - 41
Avionics News January 2018 - 42
Avionics News January 2018 - 43
Avionics News January 2018 - 44
Avionics News January 2018 - 45
Avionics News January 2018 - 46
Avionics News January 2018 - 47
Avionics News January 2018 - 48
Avionics News January 2018 - 49
Avionics News January 2018 - 50
Avionics News January 2018 - 51
Avionics News January 2018 - 52
Avionics News January 2018 - 53
Avionics News January 2018 - 54
Avionics News January 2018 - 55
Avionics News January 2018 - 56
Avionics News January 2018 - 57
Avionics News January 2018 - 58
Avionics News January 2018 - 59
Avionics News January 2018 - 60
Avionics News January 2018 - 61
Avionics News January 2018 - 62
Avionics News January 2018 - 63
Avionics News January 2018 - 64
Avionics News January 2018 - 65
Avionics News January 2018 - 66
Avionics News January 2018 - 67
Avionics News January 2018 - 68
Avionics News January 2018 - 69
Avionics News January 2018 - 70
Avionics News January 2018 - 71
Avionics News January 2018 - 72
Avionics News January 2018 - Cover3
Avionics News January 2018 - Cover4
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