the_radio_amateurs_vhf_manual.pdf

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COPYRIGHT
1972 BY
THE
AMERICAN RADIO RELAY LEAGUE,
INC.
Copyright
secured
under the Pan-American
Convention
International Copyright
secured
This
work
is
Publication
No.
23
of The
Radio
Amateur's
Library,
published
by the
League.
All
rights
reserved. No
part
of
this
work
may
be
repro-
duced
in
any
form
except
by
written
permission
of
the publisher.
All
rights
of
translation
are reserved.
Printed
in
U.S.A.
Quedan
reservados
todos
los derechos
Third Edition
Second Printing
Library
of
Congress
Catalog
Card
Number:
65-22343
$4.00
in
U.S.A.
$4.50
elsewhere
Foreword
Probably
no segment of
amateur
radio
has moved
so
rapidly
in
recent years
as
"The
World
Above
50 Mc" which
is
this
book's
concern. Though
The
Radio
Amateur's
VHF
Manual
was
introduced
in
1965, and
completely reworked
in
1968,
developments
in
the vhf
realm
have
come
so
fast, and
in
such bewildering
variety,
that
this
third edition
is
already overdue.
Frequencies
above 50
MHz
have
always
been prime experi-
menter
territory, but
in
the
Seventies
they
are
increasingly
a
com-
municator's
world,
as
well.
As
such they
are
attracting
an ever-higher
percentage of the world's
users
of the radio -frequency
spectrum
military, governmental,
and
commercial,
as
well
as
amateur. Just
since
this
book
was
first
produced,
we
have seen
amateur communication
via
the moon become
a
worldwide
reality
on
all
amateur frequencies
from
144
to 2450
MHz.
Amateur
satellites have shown
ever
more
clearly
that
the days of
"DX" (if
the term
means
"distance"
of the
conventional variety)
are
numbered.
Who
could listen
to
Apollo
conversations
(frequently
using
channels
close
to
our
2300
-MHz
band)
and
not
realize
that
we are
in
the midst
of
nothing
less
than
a
communications revolution?
The more
conventional aspects of
vhf and
uhf
hamming
have
been moving
with equal speed.
MI
-solid-state
equipment
of
remarkable
utility
has made
the vest-pocket ham
station
a
reality.
Coming soon,
the "wrist radio"? Vhf
and
uhf
repeaters
make
commonplace
a
degree
of 'round-the-clock reliability undreamed
of
even
a
few
years
ago.
Extensive
use
of
ssb
techniques
has
extended the
range
of
voice
Communication far
beyond the best
we
could manage
heretofore.
More
occupancy,
more
effective
equipment,
bigger
antennas,
and
growing
propagation
knowledge
are
showing
new
potentials of
all
our
bands,
up
through at
least 10,000
MHz.
Obviously,
it's
time
for
a
new VHF
Manual.
Edition
Three
is
full
of
new
material,
but
it
retains the down-to-earth readability of
its
widely acclaimed predecessors. Like
them, it
is
mainly the work
of
QST's
long-time VHF
Editor,
Edward
P.
Tilton,
W1HDQ.
Ed's
exper-
ience span
has seen
the bands
above 50
MHz all
the way, from their
early
status
as
get -lost
room for
a
special
breed of ham, to their
now
-recognized
stature
as
a
major
asset
for
all
amateurs.
Assisting
Ed
with
much
interesting
and
practical information
on
fm and
repeaters
is
Douglas
A.
Blakeslee,
WI
KLK,
for
some years now
a
fixture
on the
QST
masthead,
as
Assistant Technical
Editor.
We
trust that you'll
find
them
a
good
team.
-
Newington, Conn.
JOHN HUNTOON,
W1RW
General Manager,
ARRL
Ross
A.
Hull, vhf
pioneer, and
QST Associate
Editor,
1931-1938.
Ross
saw
the
potential of
the
then -uncharted
world above 50
MHz
perhaps more
clearly
than
any
other
man
of
his
time. The technical
excellence
of
his
equipment
designs and his
enthusiasm
in
print
and
in
person fired the imagination of
a
whole new generation
of
radio amateurs,
among them the
author
of
this
book.
Hull's discovery and eventual
explanation of tropospheric bending of vhf
waves has
been
called
"one of
the truly outstanding
examples
of
scientific achievement
by
an
amateur
in
any
field
of
human endeavor."
CONTENTS
Chapter
1
How
It
All
Started
A
Vast
Resource
7
2
3
14
Reception
Above
50
MHz
Vhf
Receivers,
Converters and Preamplifiers
Vhf
Transmitter
Design
30
4
5
44
67
6
7
8
Vhf Exciters
and Amplifiers
Vhf Stations
80
123
151
Antennas and Feed
Systems
Building
and
Using
Uhf Antennas
Fm
9
10
11
176
-
Theory
and
Techniques
.
218
235
263
275
Fm
Transmitters,
Receivers
and Accessories
12
13
Repeaters
-
Theory and Practice
Uhf and
Microwaves
Test
Equipment
for the
Vhf
Station
14
15
16
306
328
Interference
Causes
and Cures
Bíts
and
Pieces
338
350
Index

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