Posted by Opcom, in "the other thread":
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Some examples by section or page: (fair use)
1.8
"Although more hams are embracing
digital modes every day, phone and
CW by far remain the most popular Amateur
Radio communication modes. Ham voice
modes are amplitude modulation (AM), which
includes the narrower-bandwidth single sideband
(SSB), and frequency modulation (FM).
For the most part, SSB is heard on HF, while
FM is the typical voice mode employed on
VHF, UHF and microwave bands.
The great majority of ham radio HF phone
operators use SSB (subdivided further into
upper sideband and lower sideband), but a few
still enjoy and experiment with the heritage
“full-carrier AM.” Once the primary ham radio
voice mode, this type of AM still is heard
on the standard broadcast band (530 to 1710
kHz). Today’s AM buffs enjoy its warm, rich
audio quality, and the simplicity of circuit
design encourages restoring or modifying
vintage radios or building from scratch. For
more information about AM operation, visit
www.arrl.org/tis/info/am.html."
1.6.1
"Despite the proliferation of cell phones
and other personal communications devices,
radio enthusiasts may have a parallel interest
in conventional AM voice transmission.
These activities take vintage radio fans back
to an era when amateurs knew how their
equipment worked and repaired it when it
didn’t."
- now if that is not a strong statement concerning the skills I don't know what is.
1.9
AM is the first term in the glossary
also mentioned AM in sections/pages:
3.5
analog basics
4.7.1
microcontrollers - talks about how older CW, AM,and SSB gear was a bigger handful to make and use before micros.
8.1
modulation
rates discussed - CW is as to digital as AM is to NTSC TV video
8.2
designators
(a total of 45 times in chapter 8 on modulation and is but one of many modes (incl phase. etc.) compared with many types of digital modulations.)
section 8.2.2
"In addition to the noise and interference-
reduction advantage, angle-modulated
signals share with full-carrier AM the advantages
of non-critical frequency accuracy and
the continuous presence of a signal, which
eases the task of the automatic gain control
system in the receiver."
8.5.3
"For analog modes, modulation accuracy is
mainly a question of maintaining the proper
frequency response across the desired bandwidth
with minimal distortion and unwanted
signal artifacts. In-band artifacts like noise
and spurious signals should not be a problem
with any reasonably-well-designed system.
Maintaining modulation peaks near 100% for
AM signals or the proper deviation for FM
signals is facilitated by an audio compressor.
It can be either the type that uses a detector
and an automatic-gain-control feedback loop
to vary the gain in the modulation path or a
clipper-type compressor that limits the peak
amplitude and then filters the clipped signal
to remove the harmonics and intermodulation
products that result. SSB transmitters can
also use audio speech compression to maintain
the proper peak power level although, as
explained previously, clipping of the signal
before it reaches the modulator can cause
unacceptable distortion unless special techniques
are used."
chapter 10 -mixers, modulators, demodulators
10.2.2
using AM to send morse code
10.2.3
The many faces of amplitude modulation
includes also DSB and Single-sideband, full-carrier AM
.
.
.
17.1
"Power requirements also depend on the mode being used. Some
digital modes, such as PSK31, work very well with surprisingly
low power. CW is more power efficient than SSB voice. Least effective
is full carrier AM, which is still used by vintage equipment
lovers."
17.7.3 (power amps)
of muffin fans blowing on tubes:
"Many amateurs have used this cooling method
successfully in low-duty-cycle CW and SSB
operation but it is not recommended for AM,
SSTV or RTTY service."
18.2.1
"AM and SSB — There is no reason to limit
repeaters to FM."
I'm quitting here - that is 18 out of 30 chapters, and all of them seem to evenly discuss all modes where appropriate, even from my jaded view. No there are not any plans for high level modulators, 3-diode limiters, swinging-choke-input power supplies, and the like. It is likely that the that the state of that art has reached its zenith among the practicioners of the craft, magisters all, and there is only a little more to write about it. The fact that it does include AM pleasantly is a good thing, I find no fault. The book is not intended to be a tome on engineering replicas of antique radio equipment. There are many other and better books for that.
To be honest, I think the book gives AM a fair and factual treatment, without dengrating or cowtowing to it.
As for its worth, I have not bought an ARRL handbook in 4 years. This one has much new material to offer from that standpoint and goes into many informative details on the more new technology items (which hardcore glass and brass folks might not care about).
ON the CDROM itself:
AM is mentioned 365 times
CW is mentioned 476 times
FM is mentioned 482 times
SSB is mentioned 431 times
DSB is mentioned 23 times
QAM is mentioned 45 times
ATV is mentioned 235 times
SSTV is mentioned 210 times
DTV is mentioned 47 times
ATSC is mentioned 5 times
NTSC is mentioned 30 times
PSK is mentioned 22 times
RTTY is mentioned 112 times
winlink is mentioned 54 times
PACTOR is mentioned 112 times
PACTOR III is mentioned 20 times
tubes are mentioned 226 times
transistors are mentioned 350 times
FET are mentioned 165 times
Class E is mentioned 9 times (this may be found lacking)