Popular_Electronics 1976-08.pdf

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BUYER'S
GUIDE
TO
ANTENNA
ROTATORS
Popular
Electronics
WORLDS
LARGEST- SELLING ELECTRONICS
MAGAZINE
c-
;
.
,.T
1976
/
$
1
EASY
-TO
-BUILD
1
-Hz
TO
1
-MHz
FREQUENCY
COUNTER
DX
Clubs
on
International
Shortwave
Build
A
High-
r
ANOTHER
BREAKTHROUGH!
Sensitivity
Gas
and
Fume
Detector
THE
COSMAC
'ELF'
A
MICROCOMPUTER
TRAINER
THAT'S POWERFUL,
EXPANDABLE AND
COSTS AS
LITTLE
AS
$80.
Learn
Electronic
Theory
with
Calculators,
Part
II
Inexpensive
Electronic
Keyer
Makes
Morse
Code
Easy
TEST
REPORTS
Onkyo
"Quartz
lock"
Stereo Receiver
B
&0
Geogram 1900
Manual
Turntable
Realistic
Phase
-Lock
AM
/SSB
CB
Transceiver
www.americanradiohistory.com
Experience
is
the best
teacher.
You
29's
over
-sized illuminated
meter
tells
might settle
for
any CB
first
time
around.
you
just
how much
power
you're punch-
ing out
and
pulling
in.
For
voice modula-
Understandably.
A lot of
people
think
tion
the DynaMike delivers
at
100
%.
they're
all
pretty
much
alike.
But you'll
soon discover
that,
like
everything
else,
Same
way
with
power:
The
29
transmits
at
maximum
power
levels.
there are
exceptions.
Sooner
or
later
you'll
get
a
Cobra.
Ask
the
pros.
America's
long distance
truckers. These guys
talk CB
day
in
and
And
you'll
get engineering
and
crafts-
manship
second
to
none.
Performance
day
out.
And
they
demand
the best.
that
will
make
your
first
CB
seem
That's why
truckers
refer
to
the
Cobra
obsolete.
Reliability
and
durability that
29 as "The
Diesel Mobile"
have set
standards
for
the
industry.
Listen
to
Cobra.
You'll
hear
a
big
difference.
Because
the
Cobra
29 gives
Above
all,
you'll
get
power. The
power
you
features
which
assure
crystal clear
to
punch through
loud
and
clear
like
reception.
Like
switchable noise
limiting
nothing
else.
Because when
it
comes
to
and
blanking,
to
cut out practically
all
CB
radio,
nothing
punches through
loud
pulse
and
ignition
interference.
Add
and
clear
like
a
Cobra.
squelch
control
and
RF gain
and
you've
got
exceptional-adjustable-receiver
clarity.
Even
in
the heaviest CB
traffic.
You
also
get
Delta Tuning
which
makes
Punches through
loud and
clear.
up
for
the
other
guy,
because
even
off
-
Cobra
Communications,
Products
of
Dynascan Corp.
frequency
transmitters are pulled
in.
1801
W.
Belle
Plaine,
Chicago,
Illinois
60613
Perfectly.
Talk
to
Cobra.
And
you
know you're
punching
through.
One glance
at
the
CIRCLE
NO
14
ON
FREE
INFORMATION
CARD
IF
YOUR
FIRST
CB
ISN'T
A
COBRA
YOUR,
SECOND ONE
WILL
BE.
-
7f1
_1_-11111011
www.americanradiohistory.com
of
the
micro-world
Measuring just
11"
wide
x
11"
deep
x
5" high,
and
weighing
a
mere
7
pounds, the
Altair
680b
is a
complete,
general -purpose
computer.
The
secret
to this revolutionary, small computer
is
its CPU
board.
This
double
-sided board
fits
along the
bottom of
the
Altair
case and
plugs
directly
into
the
front
panel board.
It
contains
the
new
6800
microprocessor,
1,024
bytes
of
RAM memory,
a
256
byte
PROM
monitor, provisions for
768
bytes
of
additional
PROM
or
ROM, and
a
single
Interface port
with
a
Motorola
ACIA
serial
interface adapter which
can
be
configured either
RS
-232
or
TTY.
A
five
level Baudot
interface
option
is
also
available.
The
Altair
680b can
be
programmed from
front
panel switches,
or
it
can
be
interfaced to
a
video display terminal,
or
teletype-
writer.
Three
additional
circuit
boards can
be
plugged inside the
Altair
680h
for further memory
and
interface
expansion.
The
first
of
these hoards
is
a
16K
static
RAM
memory
board.
Software already
developed includes
Altair
680 BASIC
with
all
the features of the
8K BASIC
previously developed for
the
Altair
8800. These
include
Boolean operators, the
ability
to
read
or
write
a
byte
from
any
I/O
port
or
memory location,
multiple
statements
per
line,
and
the
ability
to
interrupt
program execution
and
then
continue after
the
examination of variable
values.
This
software
takes
only
6.8K bytes
of memory
space and
a
copy
is
included
free
with
the purchase of the
Altair
680 16K
memory
board.
Other software includes
a
resident two
pass
assembler. The
Altair
6806
is
also
compatible with Motorola
6800
software.
The
Altair
680b
is
ideal for hobbyists who want
a
powerful
computer
system at
an
economic
price.
Altair
680b owners
qualify
TM'
for membership
in
the
Altair
Users
Group,
and
like
other Altair
owners,
they receive
a
complimentary
subscription to Computer
Notes and
complete factory
support.
PRICES:
Altair
680b
kit with complete,
easy
-to- understand assembly man-
$466
ual,
operator's manual,
and
programming
manual
$625
Assembled
Altair
6806
395
kit
Altair
680b Turnkey
model
$
24
680MB (required
to
expand
680)
Expander
Card
$685
Altair
680BSM
16K
static
RAM board
kit with
680 BASIC..
$200
Altair
680 BASIC
when purchased separately
Baudót
option
$
42
MAIL
THIS
COUPON TODAY
Enclosed
is
a
check
for
S
or Master Charge #
BankAmericard
#
Assembled
Kit
Other
(specify)
Altair
680b
enclose
S8
for
postage and
handling
Please send
free
information
package.
NAME
I
ADDRESS
CITY
STATE &
ZIP
2450
Alamo
L.
SE
/Albuquerque,
NM
87106, 505-243-7821
¡
NOTE:
Altair
is
a
trademark
of
MITS.
Inc.
Price,
specifications subject
to change.
Please
allow
up
to
60
days
for delivery.
www.americanradiohistory.com
Hey,
you
ten
million
CB
enthusiasts.
We've
got
an
all-
weather external
mount
speaker
that
looks
good inside or
outside
any vehicle.
Clears up
garbled voices,
knocks
out
static. Let you
hear
what's
on
the
air
--
even
if
you're
away
from your
vehicle.
Better
than
you
believed possible.
Because
AFS offers
the
first
acoustically
designed voice
communications
all-weather P.A. speaker,
delivering outstanding
across
the
entire
voice
range.
intelligibility
and
clarity
AFS
--
the
only company
with
the
patented
'WORKING WALL
"m
enclosure,
featuring
cross
-laminated,
tubular
fiberboard construction
to
deaden
static,
eliminate
voice
distortion.
SPEAKERS
ARE
OUR ONLY
BUSINESS.
THEY HAVE
TO BE
BETTER
!
Available
to
CB
dealers
everywhere.
oafs
AFS® /KRIKET
®speakers
2
World
Wide Headquarters
Acoustic
Fiber Sound
Systems, Inc.
7999 Knue Road, Suite
116
Indianapolis, Indiana 46250
(317) 842 -0620
Exclusive Canadian
Distributor
Muntz
Canada
Ltd.
1149 Pioneer Road
Burlington Ontario,
Canada
(416) 639 -5373
are
manufactured
in
the U.S.A.
using
American
materials
and
craftsmen.
Copyright
1976
Acoustic
Fiber
Sound Systems, Inc.
POPULAR ELECTRONICS
www.americanradiohistory.com
AUGUST
1976
VOLUME
10,
NUMBER
2
Popular
Electronics®
WORLD'S LARGEST
SELLING ELECTRONICS MAGAZINE
FEATURE
ARTICLES
BUYER'S GUIDE
TO
ANTENNA
ROTATORS
How they work and what's available.
DX
PROGRAMS AND
DX
CLUBS
ON
SHORTWAVE
Ways
to
improve your
SW
listening
pleasure.
Kris
Carrole
39
53
58
Richard
E.
Wood
LEARNING ELECTRONIC
THEORY WITH HAND CALCULATORS
Part
Two:
Reactance,
Time
Constants, and
AC
Calculations.
Edward
M.
Noll
CONSTRUCTION ARTICLES
BUILD
THE
COSMAC
"ELF"
A
Low -Cost
Experimenter's Microcomputer.
A
SIMPLE ELECTRONIC
KEYER
FOR
SENDING
MORSE CODE
IMPROVED
GAS
AND
FUME DETECTOR
High- sensitivity detector
uses
latest components and circuits.
BUILD
A
LOW -COST
1
-HZ
to
1
-MHZ FREQUENCY COUNTER
Counter with
3
-digit readout
uses
new
CMOS
chips.
Joseph Weisbecker
William
J.
Vancura
C
R.
Lewart
33
44
46
48
50
Norman
P.
Huffnagle
R.
FLOWER POWER
Photocell, transistor -diode
ac
power control
system.
James
Squires
COLUMNS
STEREO SCENE
The
Great
Tube
/Transistor Controversey.
Ralph
Hodges
14
HOBBY SCENE
SOLID
STATE
Simple
Stopwatch Splits Seconds!
CB
SCENE
Is
Class
E
Dead?
John McVeigh
Lou
Garner
Ray
Newhall
24
73
82
86
91
AMATEUR RADIO
Lightning
and
the Radio Amateur.
Herbert
S.
Brier
EXPERIMENTER'S CORNER
The 567
Tone
Decoder.
Forrest
M.
Mims
PRODUCT TEST REPORTS
ONKYO MODEL
TX
-4500 AM /STEREO
FM
RECEIVER
BANG
&
OLUFSEN BEOGRAM MODEL
1900
RECORD PLAYER
REALISTIC
MODEL TRC
-57
NAVAHO
CB
TRANSCEIVER
SENCORE MODEL DVM32 PORTABLE DMM
66
68
70
72
DEPARTMENTS
EDITORIAL
Planting Electronics Hobby
Seeds.
Art Salsberg
4
LETTERS
OUT OF TUNE
"Add
Missing Segments"
(Tips
8
Techniques, June
1976)
"A
Scientific Programmable Calculator"
(May
1976)
"Space
War
Game" (April
1976)
6
6
NEW PRODUCTS
NEW
LITERATURE
NEWS
HIGHLIGHTS
ELECTRONICS LIBRARY
OPERATION ASSIST
ADVERTISERS INDEX
POPULAR ELECTRONICS,
August
1976.
Volume
10.
Number
2.
Pub-
lished monthly
at
One Park
Avenue,
New
York.
NY 10016.
One year sub-
scription
rate
for
U.S..
$9.98.
U.S.
Possessions and Canada.
$11.98. all
other countries.
$12.98 (cash
orders only. payable
in U.S.
currency).
Sec-
ond Class postage paid
at
New
York.
NY
and
at
additional mailing offices.
Authorized
as
second class madby the Post Office Department. Ottawa.
Canada and for payment of postage
in
cash.
POPULAR ELECTRONICS
including
ELECTRONICS WORLD. Trade
Mark Registered. Indexed
in
the Reader's Guide to
Periodical Literature.
1976
BY
ZIFF
-DAVIS PUBLISHING COMPANY. ALL
COPYRIGHT
RIGHTS RESERVED.
Ziff
-Davis also
publishes Boating,
Car
and Driver. Cycle. Flying,
Modern
Bride. Popular Photography. Skiing
and Stereo Review.
<.
9
12
30
88
90
113
Material
in
this
publication
may
not
be
reproduced
in
any
form
without
permission.
Requests for
permission should
be
directed
to
Jerry
Schneider. Rights and Permissions. Ziff -Davis
Publishing
Co..
One Park
Ave.. New
York,
NY 10016.
Editorial correspondence:
POPULAR ELECTRONICS, Park Ave.. New
York.
NY 10016.
Editorial
contributions
must
be
accompanied
by
return
postage
and
will
be
handled with reasonable
care. however,
publisher
assumes
no
responsibility
for return or safety of
manuscripts.
art
work. or
1
models
Forms
3579
and all
subscription correspondence:
POPULAR ELEC-
TRONICS.
Circulation
Dept.,
P.O
Box 2774,
Boulder.
CO
80302. Please
allow
at
least
eight weeks
for
change
of address.
Include your
old address.
enclosing.
if
possible,
an
address label from
a
recent issue.
3
AUGUST
1976
www.americanradiohistory.com

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