Pilot's Guide to Avionics 2013-2014 - 46

AIRCRAFT AS ANTENNA FARM
Continued from page 45

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Now, create an image of all the
receivers and the antennae crowded
onto the skin of a fuselage or other
surface.
It looks and is crowded, or it would
be if not for advances in antenna
technology that let some serve combined functions.
Even with those advances, the
antenna crop puts more pressure
than ever on the care required to
determine where on the aircraft to
mount some of them.
The issue could become less
complicated in time as technology
solves more of the problems associated with mounting decisions.
In the meantime, careful attention
to the role of each antenna, manufacturers’ instructions and multiplerole aspects of some demand careful
planning and execution when moving or adding an antenna.
Challenges of Proliferation:
Like Real Estate, Location
is Everything
While aircraft and avionics provide new services and functions not
thought of just a few years ago, including satellite navigation, satellite weather, ground-based weather and ADSB, the proliferation of antenna needs
presents the same age-old challenges
of the past: mounting location.
Mounting locations must be chosen with the avoidance of external
interference in mind.
Some systems require greater care
than others, in large part because of
their sensitivity to interference and the
low signal-to-noise ratio of the transmission.
Spherics devices, in particular, are
sensitive to electronic noise sources
external to the system. To hear lightning strikes with sufficient signal
strength for the computer to calculate
direction and distance, the antenna
must be mounted on a spot with minimal electronic noise from other devic-

- 46 -

es. The cable should be routed away
from other wiring – even other coaxial
cables – so the faint cry of a distant
lightning strike gets heard loudly and
clearly.
Technicians have long worked to
map the aircraft skin to find the quietest spot for the spherics antenna.
Separation standards also must
be followed between VHF and microwave antennae – think nav/comm and
transponder – to avoid the prospect of
a transmission bleeding through to a
GPS receiver.
It’s the issue of interference of
GPS navigators traced to an adjacent microwave-spectrum source that
brought down Lightsquared’s ambitious plan to launch an independent
4-G smartphone service to resell
to cellphone companies. Too much
power from even miles away simply
drowned out the relatively weak signal
of the navigation satellites.
Avoiding the same problem on a
single-airplane scale drives the location decisions for mounting everything, from the GPS antenna to the
transponder and CAS antennae, VHF
nav/comm antennae and datalinkreceiver antennae.
The issue also strikes at the heart
of some avionics equipment that uses
GPS as one of several references
used to determine attitude, heading
and air data provided by some of the
newest primary flight displays.
But some of these issues have
changed, thanks to some very clever
engineers who undertook the design
challenge of new-technology antennae and help rectify the issues of
cross- and intra-spectrum interference, while reducing the crop in the
antenna farm.
Multitasking Comes
to the Antenna Farm
Multitasking has come to aviation radio antennae, and not too
soon.
“Just when you think this is getting too complicated to complete,
someone comes along with a solu-


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Table of Contents for the Digital Edition of Pilot's Guide to Avionics 2013-2014

From the Publisher
Interested in AEA Membership?
AEA Staff/Board of Directors
New Avionics Products for 2013
What's Up With Backup Instruments?
Going Glass
Before & After
Aircraft as Antenna Farm
Cockpit Innovations
Understanding Autopilot Upgrades
ADS-B Circa 2013
Portable Powerhouses, GPS and VHF
Minimal Panels
NextGen Status Report
Repair Stations
Manufacturers/Distributors
Affiliates/Index
AEA Member Company Index
Advertiser Index
Pilot's Guide to Avionics 2013-2014 - Intro
Pilot's Guide to Avionics 2013-2014 - Cover1
Pilot's Guide to Avionics 2013-2014 - Cover2
Pilot's Guide to Avionics 2013-2014 - 1
Pilot's Guide to Avionics 2013-2014 - 2
Pilot's Guide to Avionics 2013-2014 - 3
Pilot's Guide to Avionics 2013-2014 - Interested in AEA Membership?
Pilot's Guide to Avionics 2013-2014 - 5
Pilot's Guide to Avionics 2013-2014 - AEA Staff/Board of Directors
Pilot's Guide to Avionics 2013-2014 - 7
Pilot's Guide to Avionics 2013-2014 - New Avionics Products for 2013
Pilot's Guide to Avionics 2013-2014 - 9
Pilot's Guide to Avionics 2013-2014 - 10
Pilot's Guide to Avionics 2013-2014 - 11
Pilot's Guide to Avionics 2013-2014 - 12
Pilot's Guide to Avionics 2013-2014 - 13
Pilot's Guide to Avionics 2013-2014 - 14
Pilot's Guide to Avionics 2013-2014 - 15
Pilot's Guide to Avionics 2013-2014 - 16
Pilot's Guide to Avionics 2013-2014 - 17
Pilot's Guide to Avionics 2013-2014 - 18
Pilot's Guide to Avionics 2013-2014 - 19
Pilot's Guide to Avionics 2013-2014 - 20
Pilot's Guide to Avionics 2013-2014 - 21
Pilot's Guide to Avionics 2013-2014 - 22
Pilot's Guide to Avionics 2013-2014 - 23
Pilot's Guide to Avionics 2013-2014 - 24
Pilot's Guide to Avionics 2013-2014 - 25
Pilot's Guide to Avionics 2013-2014 - 26
Pilot's Guide to Avionics 2013-2014 - 27
Pilot's Guide to Avionics 2013-2014 - 28
Pilot's Guide to Avionics 2013-2014 - 29
Pilot's Guide to Avionics 2013-2014 - What's Up With Backup Instruments?
Pilot's Guide to Avionics 2013-2014 - 31
Pilot's Guide to Avionics 2013-2014 - 32
Pilot's Guide to Avionics 2013-2014 - 33
Pilot's Guide to Avionics 2013-2014 - Going Glass
Pilot's Guide to Avionics 2013-2014 - 35
Pilot's Guide to Avionics 2013-2014 - 36
Pilot's Guide to Avionics 2013-2014 - 37
Pilot's Guide to Avionics 2013-2014 - 38
Pilot's Guide to Avionics 2013-2014 - 39
Pilot's Guide to Avionics 2013-2014 - 40
Pilot's Guide to Avionics 2013-2014 - 41
Pilot's Guide to Avionics 2013-2014 - Before & After
Pilot's Guide to Avionics 2013-2014 - 43
Pilot's Guide to Avionics 2013-2014 - Aircraft as Antenna Farm
Pilot's Guide to Avionics 2013-2014 - 45
Pilot's Guide to Avionics 2013-2014 - 46
Pilot's Guide to Avionics 2013-2014 - 47
Pilot's Guide to Avionics 2013-2014 - 48
Pilot's Guide to Avionics 2013-2014 - 49
Pilot's Guide to Avionics 2013-2014 - Cockpit Innovations
Pilot's Guide to Avionics 2013-2014 - 51
Pilot's Guide to Avionics 2013-2014 - 52
Pilot's Guide to Avionics 2013-2014 - 53
Pilot's Guide to Avionics 2013-2014 - 54
Pilot's Guide to Avionics 2013-2014 - 55
Pilot's Guide to Avionics 2013-2014 - Understanding Autopilot Upgrades
Pilot's Guide to Avionics 2013-2014 - 57
Pilot's Guide to Avionics 2013-2014 - 58
Pilot's Guide to Avionics 2013-2014 - 59
Pilot's Guide to Avionics 2013-2014 - ADS-B Circa 2013
Pilot's Guide to Avionics 2013-2014 - 61
Pilot's Guide to Avionics 2013-2014 - 62
Pilot's Guide to Avionics 2013-2014 - 63
Pilot's Guide to Avionics 2013-2014 - 64
Pilot's Guide to Avionics 2013-2014 - 65
Pilot's Guide to Avionics 2013-2014 - Portable Powerhouses, GPS and VHF
Pilot's Guide to Avionics 2013-2014 - 67
Pilot's Guide to Avionics 2013-2014 - 68
Pilot's Guide to Avionics 2013-2014 - 69
Pilot's Guide to Avionics 2013-2014 - 70
Pilot's Guide to Avionics 2013-2014 - 71
Pilot's Guide to Avionics 2013-2014 - 72
Pilot's Guide to Avionics 2013-2014 - 73
Pilot's Guide to Avionics 2013-2014 - 74
Pilot's Guide to Avionics 2013-2014 - 75
Pilot's Guide to Avionics 2013-2014 - 76
Pilot's Guide to Avionics 2013-2014 - 77
Pilot's Guide to Avionics 2013-2014 - 78
Pilot's Guide to Avionics 2013-2014 - 79
Pilot's Guide to Avionics 2013-2014 - Minimal Panels
Pilot's Guide to Avionics 2013-2014 - 81
Pilot's Guide to Avionics 2013-2014 - 82
Pilot's Guide to Avionics 2013-2014 - 83
Pilot's Guide to Avionics 2013-2014 - NextGen Status Report
Pilot's Guide to Avionics 2013-2014 - 85
Pilot's Guide to Avionics 2013-2014 - 86
Pilot's Guide to Avionics 2013-2014 - 87
Pilot's Guide to Avionics 2013-2014 - 88
Pilot's Guide to Avionics 2013-2014 - Repair Stations
Pilot's Guide to Avionics 2013-2014 - 90
Pilot's Guide to Avionics 2013-2014 - 91
Pilot's Guide to Avionics 2013-2014 - 92
Pilot's Guide to Avionics 2013-2014 - 93
Pilot's Guide to Avionics 2013-2014 - 94
Pilot's Guide to Avionics 2013-2014 - 95
Pilot's Guide to Avionics 2013-2014 - 96
Pilot's Guide to Avionics 2013-2014 - 97
Pilot's Guide to Avionics 2013-2014 - 98
Pilot's Guide to Avionics 2013-2014 - 99
Pilot's Guide to Avionics 2013-2014 - 100
Pilot's Guide to Avionics 2013-2014 - 101
Pilot's Guide to Avionics 2013-2014 - 102
Pilot's Guide to Avionics 2013-2014 - 103
Pilot's Guide to Avionics 2013-2014 - 104
Pilot's Guide to Avionics 2013-2014 - 105
Pilot's Guide to Avionics 2013-2014 - 106
Pilot's Guide to Avionics 2013-2014 - 107
Pilot's Guide to Avionics 2013-2014 - 108
Pilot's Guide to Avionics 2013-2014 - 109
Pilot's Guide to Avionics 2013-2014 - 110
Pilot's Guide to Avionics 2013-2014 - 111
Pilot's Guide to Avionics 2013-2014 - 112
Pilot's Guide to Avionics 2013-2014 - 113
Pilot's Guide to Avionics 2013-2014 - 114
Pilot's Guide to Avionics 2013-2014 - 115
Pilot's Guide to Avionics 2013-2014 - 116
Pilot's Guide to Avionics 2013-2014 - 117
Pilot's Guide to Avionics 2013-2014 - 118
Pilot's Guide to Avionics 2013-2014 - 119
Pilot's Guide to Avionics 2013-2014 - 120
Pilot's Guide to Avionics 2013-2014 - 121
Pilot's Guide to Avionics 2013-2014 - 122
Pilot's Guide to Avionics 2013-2014 - 123
Pilot's Guide to Avionics 2013-2014 - 124
Pilot's Guide to Avionics 2013-2014 - 125
Pilot's Guide to Avionics 2013-2014 - 126
Pilot's Guide to Avionics 2013-2014 - 127
Pilot's Guide to Avionics 2013-2014 - 128
Pilot's Guide to Avionics 2013-2014 - 129
Pilot's Guide to Avionics 2013-2014 - 130
Pilot's Guide to Avionics 2013-2014 - 131
Pilot's Guide to Avionics 2013-2014 - 132
Pilot's Guide to Avionics 2013-2014 - Manufacturers/Distributors
Pilot's Guide to Avionics 2013-2014 - 134
Pilot's Guide to Avionics 2013-2014 - 135
Pilot's Guide to Avionics 2013-2014 - 136
Pilot's Guide to Avionics 2013-2014 - 137
Pilot's Guide to Avionics 2013-2014 - 138
Pilot's Guide to Avionics 2013-2014 - 139
Pilot's Guide to Avionics 2013-2014 - 140
Pilot's Guide to Avionics 2013-2014 - 141
Pilot's Guide to Avionics 2013-2014 - 142
Pilot's Guide to Avionics 2013-2014 - 143
Pilot's Guide to Avionics 2013-2014 - 144
Pilot's Guide to Avionics 2013-2014 - Affiliates/Index
Pilot's Guide to Avionics 2013-2014 - 146
Pilot's Guide to Avionics 2013-2014 - 147
Pilot's Guide to Avionics 2013-2014 - 148
Pilot's Guide to Avionics 2013-2014 - 149
Pilot's Guide to Avionics 2013-2014 - 150
Pilot's Guide to Avionics 2013-2014 - AEA Member Company Index
Pilot's Guide to Avionics 2013-2014 - 152
Pilot's Guide to Avionics 2013-2014 - 153
Pilot's Guide to Avionics 2013-2014 - 154
Pilot's Guide to Avionics 2013-2014 - 155
Pilot's Guide to Avionics 2013-2014 - 156
Pilot's Guide to Avionics 2013-2014 - 157
Pilot's Guide to Avionics 2013-2014 - 158
Pilot's Guide to Avionics 2013-2014 - 159
Pilot's Guide to Avionics 2013-2014 - Advertiser Index
Pilot's Guide to Avionics 2013-2014 - Cover3
Pilot's Guide to Avionics 2013-2014 - Cover4
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