Raytown Amateur Radio Club
Technology net - Amateur Radio Modulation Modes
Technology net - Friday - July 17,2009 8:00 PM - KØGQ repeater 145.170(-) Echolink - KØGQ-R - Node# 403841
Modulation is the process by which voice, music, and other
"intelligence" is added to the radio waves produced by a transmitter.
The different methods of modulating a radio signal are called modes. An unmodulated
radio signal is known as a carrier. When
you hear "dead air" between songs or announcements on a radio
station, you're "hearing" the carrier. While a carrier contains no
intelligence, you can tell it is being transmitted because of the way it quiets
the background noise on your radio.
The different modes of modulation have their advantages and
disadvantages. Here is a summary:
Continuous Wave (CW)
CW is the simplest form of modulation. The output of the
transmitter is switched on and off, typically to form the characters of the
Morse code.
CW transmitters are simple and inexpensive, and the
transmitted CW signal doesn't occupy much frequency space (usually less than
500 Hz). However, the CW signals will be difficult to hear on a normal
receiver; you'll just hear the faint quieting of the background noise as the CW
signals are transmitted. To overcome this problem, shortwave and ham radio
receivers include a beat frequency oscillator
(BFO) circuit. The BFO circuit produces an internally-generated second carrier
that "beats" against the received CW signal, producing a tone that
turns on and off in step with the received CW signal. This is how Morse code
signals are received on shortwave.
Amplitude Modulation
(AM)
In amplitude modulation, the strength (amplitude) of the
carrier from a transmitter is varied according to how a modulating signal
varies.
When you speak into the microphone of an AM transmitter, the
microphone converts your voice into a varying voltage. This voltage is
amplified and then used to vary the strength of the transmitter's output.
Amplitude modulation adds power to the carrier, with the amount added depending
on the strength of the modulating voltage. Amplitude modulation results in
three separate frequencies being transmitted: the original carrier frequency, a
lower sideband (LSB) below the carrier
frequency, and an upper sideband (USB)
above the carrier frequency. The sidebands are "mirror images" of
each other and contain the same intelligence. When an AM signal is received,
these frequencies are combined to produce the sounds you hear.
Each sideband occupies as much frequency space as the
highest audio frequency being transmitted. If the highest audio frequency being
transmitted is 5 kHz, then the total frequency space occupied by an AM signal
will be 10 kHz (the carrier occupies negligible frequency space).
AM has the advantages of being easy to produce in a
transmitter and AM receivers are simple in design. Its main disadvantage is its
inefficiency. About two-thirds of an AM signal's power is concentrated in the
carrier, which contains no intelligence. One-third of the power is in the
sidebands, which contain the signal's intelligence. Since the sidebands contain
the same intelligence, however, one is essentially "wasted." Of the
total power output of an AM transmitter, only about one-sixth is actually
productive, useful output!
Other disadvantages of AM include the relatively wide amount
of frequency space an AM signal occupies and its susceptibility to static and
other forms of electrical noise. Despite this, AM is simple to tune on ordinary
receivers, and that is why it is used for almost all shortwave broadcasting.
Single Sideband (SSB)
Since so much power is wasted in AM, radio engineers devised
a method to transmit just one sideband and put all of the transmitter's power
into sending useful intelligence. This method is known as single sideband (SSB). In SSB transmitters, the
carrier and one sideband are removed before the signal is amplified. Either the
upper sideband (USB) or lower sideband (LSB) of the original AM signal can
be transmitted.
SSB is a much more efficient mode than AM since all of the
transmitter's power goes into transmitting useful intelligence. A SSB signal
also occupies only about half the frequency space of a comparable AM signal.
However, SSB transmitters and receivers are far more complicated than those for
AM. In fact, a SSB signal cannot be received intelligibly on an AM receiver;
the SSB signal will have a badly distorted "Donald Duck" sound. This
is because the carrier of an AM signal does play a major role in demodulating
(that is, recovering the transmitted audio) the sidebands of an AM signal. To
successfully demodulate a SSB signal, you need a "substitute
carrier."
A substitute carrier can be supplied by the beat frequency
oscillator (BFO) circuit used when receiving CW signals. However, this means
that a SSB signal must be carefully tuned to precise "beat" it
against the replacement carrier from the BFO. For best performance, a SSB
receiver needs more precise tuning and stability than an AM receiver, and it
must be tuned more carefully than an AM receiver. Even when precisely tuned,
the audio quality of a SSB signal is less than that of an AM signal.
SSB is used mainly by ham radio operators, military
services, maritime and aeronautical radio services, and other situations where
skilled operators and quality receiving equipment are common. There have been a
few experiments in using SSB for shortwave broadcasting, but AM remains the
preferred mode for broadcasting because of its simplicity.
Frequency Modulation
(FM)
In CW, AM, and SSB, the carrier of the signal will not
change in a normally operating transmitter. However, it is possible to modulate
a signal by changing its frequency in accordance with a modulating signal. This
is the idea behind frequency modulation
(FM).
The unmodulated frequency of a FM
signal is called its center frequency.
When a modulating signal is applied, the FM transmitter's frequency will swing
above and below the center frequency according to the modulating signal. The
amount of "swing" in the transmitter's frequency in any direction
above or below the center frequency is called its deviation.
The total frequency space occupied by a FM signal is twice its deviation.
As you might suspect, FM signals occupy a great deal of
frequency space. The deviation of a FM broadcast station is 75 kHz, for a total
frequency space of 150 kHz. Most other users of FM (police and fire
departments, business radio services, etc.) use a deviation of 5 kHz, for a
total frequency space occupied of 10 kHz. For these reasons, FM is mainly used
on frequency above 30 MHz, where adequate frequency space is available. This is
why most scanner radios can only receive FM signals, since most signals found
above 30 MHz are FM.
The big advantage of FM is its audio quality and immunity to
noise. Most forms of static and electrical noise are
naturally AM, and a FM receiver will not respond to AM signals. FM receivers
also exhibit a characteristic known as the capture
effect. If two or more FM signals are on the same frequency, the FM
receiver will respond to the strongest of the signals and ignore the rest. The
audio quality of a FM signal increases as its deviation increases, which is why
FM broadcast stations use such large deviation. The main disadvantage of FM is
the amount of frequency space a signal requires.
Frequency-Shift Keying
(FSK)
Like FM, frequency-shift keying
(FSK) shifts the carrier frequency of the transmitter. Unlike FM, however, FSK
shifts the frequency between just two separate, fixed points. The higher
frequency is called the mark frequency
while the lower of the two frequencies is called the space frequency. (By contrast, an FM signal can swing to any
frequency within its deviation range.)
FSK was originally developed to send text via radioteleprinter devices, like those used by the TeleType Corporation. The shifting of the carrier between
the mark and space was used to generate characters in the Baudot code,
which can be thought of as a more elaborate version of the Morse code. At the
receiver, the Baudot signals were used to produce
printed text on printers and, later, video screens.
As technology improved, FSK was used to transmit messages in
the ASCII code used by computers; this permitted the use of upper and lower
case letters and special symbols. The introduction of microprocessors made it
possible to use FSK to send messages with automatic error detection and
correction capabilities. This is done by including error checking codes into
messages and allowing the receiving station to request a retransmission of a
message if the message and its error checking code are in conflict (or if the
code is not received.) Among the most common such FSK modes are amateur teleprinting over radio
(AMTOR) and forward error correction
(FEC).
FSK is the fastest way to send text by radio, and the
error-correcting modes offer high accuracy and reliability. The frequency space
occupied depends on the amount of shifting, but typical FSK signals occupy less
than 1.5 kHz of space. The big disadvantage of FSK is the more elaborate
receiving gear required.
Special receiving terminals and adapters are available to
let you "see" FSK modes. Many of these work in conjunction with
personal computers.
Digital Modes
The same technology that makes it possible for you to view
this Web site is also being used on the air. Digital modes can organize
information into packets that contain
address fields, information about the transmission protocol being used, error
detection code, a few hundred bytes of data, and bits to indicate where each
packet begins and ends.
Instead of transmitting messages in continuous streams,
packet modes break them into packets. At the receiving end, the different
packets are re-assembled to form the original message. If a packet is missing
or received with errors, the receiving station can request a retransmission of
the packet. Packets can be received out of sequence or even from multiple
sources (such as different relaying stations) and still be assembled into the
original message by the receiving station.
While packet modes have mainly been used to send text, any
information that can be converted into digital form---sound, graphics, video,
etc.---can be transmitted by digital modes.
Another advantage of packet modes is that packets can be
addressed to specific stations in the address field of each packet. Other
stations will ignore packets not addressed to them.
The big disadvantage of packet modes is the complexity of
the necessary receiving and transmitting gear. The frequency space occupied is
directly proportional to the speed at which messages are transmitted, and radio
digital modes are very slow compared to their Internet equivalents. The slowest
Web connection via the Internet is 14,400 baud (14.4K), while the maximum practical
digital mode rate via radio is 9600 baud (9.6K). On frequencies below 30 MHz,
it is even slower; rates are usually restricted to just 300 baud (0.3K)! As a
result, digital modes via radio today deliver performance far short of their
potential.
Special receiving adapters for packet modes are available,
and these usually work in conjunction with personal computers. Most offer FSK
receiving capabilities as well.
Another form of digital modulation is known as spread spectrum. Most other modulation methods
pack all of the transmitter's output power into a bandwidth of only a few kHz.
(Even in FM, the carrier doesn't occupy much bandwidth, although its frequency
may be deviated over a wide range.) Spread spectrum literally
"spreads" the carrier over a frequency range that may be as much as
10 kHz on frequencies below 30 MHz. (Spreading over
100 kHz or more is common on the VHF and UHF bands.) This spreading is usually
done via a "spreading code" contained in an internal microcontroller
chip.
When heard on a conventional receiver, spread sprectrum sounds like random noise or "gurgling"
water. A receiver equipped with a microcontroller having the matching
"spreading code" is necessary to properly receive the spread spectrum
transmission. Advantages of spread spectrum include a high degree of privacy
and freedom from intereference, since the spread
spectrum receiver will reject any signal not having the proper spreading code.
Almost all users of spread spectrum below 30 MHz are various military and
government services.
by Universal Radio Research.
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