Avionics News October 2022 - 52

series
BY THOMAS INMAN
Part II
RCS
.
a
.
Al l frequencies in MHz
.
. 
. 
.
b
.
.
. 
. 
Figure 1 : A spectrum analysis of WWV showing the carrier at 10 MHz
and side bands on either side.
52 AVIONICS NEWS * OCTOBER 2022
his month, we move to part two of our
five-part series on the ASTM radio
communication systems endorsement to the
aircraft electronics technician certification. Last month,
we defined a radio wave and how it propagates. This
month, we learn how we use the radio wave to send
information.
T
The radio wave alone sends information in the form
of its presence. In this case, the radio wave answers the
question, are you present? The answer is a simple yes
or no; yes, it is present, or no, nothing is heard.
A simple form of communication is to turn the radio
wave on and off in a pattern. If the radio signal is being
used to send information, we refer to it as a carrier
wave because it is carrying information. The mostused
pattern of on and off information transfer is to use
orse code by turning on and off the carrier wave this
is known as CW. The advantage of sending information
this way is narrow bandwidth, the narrowest of any
form of radio communication. The disadvantage of
this way of communicating is the slow speed, which
is usually significantly fewer than 15 characters per
minute.
A more-useful way to send information is to use
modulation, which is a fancy word for change. Thus,
C can be considered a form of modulation since
we are changing the carrier by turning it on and off.
More commonly known are amplitude modulation and
frequency modulation.
The first form of modulation used widely was
amplitude modulation. Amplitude can be defined as
power. Thus, amplitude modulation is simply changing
the power up and down to send information. In simple
terms, a microphone is used to control the output of
a radio freuency power amplifier. ost automobiles
have an AM radio installed, although few people listen
to AM radio. Aviation VHF communication systems
use AM for voice communication.
An interesting phenomenon occurs with AM and
any time two frequencies are joined together. Indeed,

Avionics News October 2022

Table of Contents for the Digital Edition of Avionics News October 2022

Avionics News October 2022 - Intro
Avionics News October 2022 - Cover1
Avionics News October 2022 - Cover2
Avionics News October 2022 - 1
Avionics News October 2022 - 2
Avionics News October 2022 - 3
Avionics News October 2022 - 4
Avionics News October 2022 - 5
Avionics News October 2022 - 6
Avionics News October 2022 - 7
Avionics News October 2022 - 8
Avionics News October 2022 - 9
Avionics News October 2022 - 10
Avionics News October 2022 - 11
Avionics News October 2022 - 12
Avionics News October 2022 - 13
Avionics News October 2022 - 14
Avionics News October 2022 - 15
Avionics News October 2022 - 16
Avionics News October 2022 - 17
Avionics News October 2022 - 18
Avionics News October 2022 - 19
Avionics News October 2022 - 20
Avionics News October 2022 - 21
Avionics News October 2022 - 22
Avionics News October 2022 - 23
Avionics News October 2022 - 24
Avionics News October 2022 - 25
Avionics News October 2022 - 26
Avionics News October 2022 - 27
Avionics News October 2022 - 28
Avionics News October 2022 - 29
Avionics News October 2022 - 30
Avionics News October 2022 - 31
Avionics News October 2022 - 32
Avionics News October 2022 - 33
Avionics News October 2022 - 34
Avionics News October 2022 - 35
Avionics News October 2022 - 36
Avionics News October 2022 - 37
Avionics News October 2022 - 38
Avionics News October 2022 - 39
Avionics News October 2022 - 40
Avionics News October 2022 - 41
Avionics News October 2022 - 42
Avionics News October 2022 - 43
Avionics News October 2022 - 44
Avionics News October 2022 - 45
Avionics News October 2022 - 46
Avionics News October 2022 - 47
Avionics News October 2022 - 48
Avionics News October 2022 - 49
Avionics News October 2022 - 50
Avionics News October 2022 - 51
Avionics News October 2022 - 52
Avionics News October 2022 - 53
Avionics News October 2022 - 54
Avionics News October 2022 - 55
Avionics News October 2022 - 56
Avionics News October 2022 - 57
Avionics News October 2022 - 58
Avionics News October 2022 - 59
Avionics News October 2022 - 60
Avionics News October 2022 - 61
Avionics News October 2022 - 62
Avionics News October 2022 - 63
Avionics News October 2022 - 64
Avionics News October 2022 - 65
Avionics News October 2022 - 66
Avionics News October 2022 - 67
Avionics News October 2022 - 68
Avionics News October 2022 - 69
Avionics News October 2022 - 70
Avionics News October 2022 - 71
Avionics News October 2022 - 72
Avionics News October 2022 - Cover3
Avionics News October 2022 - Cover4
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