Heathkit SB-401 - INTRODUCTION

INTRODUCTION
The
Heathkit
Model
SB-401
SSB
Transmitter
is
capable
of
SSB
(upper
or
lower
Sideband)
and
CW
operation
on
all
amateur
bands
from
3,5
to
30
megahertz,
A
crystal-controlled
heterodyne
oscillator
and
a
preassembled,
prealigned
linear
master
oscillator
insure
highly
accurate
and
stable
operation,
Complete
Transceive
capabilities
are
available
when
the
Transmitter
is
used
with
the
Heathkit
Model
SB-300,
SB-301,
ot
SB-303
Receiver.
The
Transmitter
can
also
be
used
with
other
receivers
by
installing
the
SBA-401-1
Crystal
Accessory
Kit
in
the
Transmitter.
This
Transmitter
is
compatible
with
the
Heathkit
Model
SB-200
SSB
Linear
Amplifier.
Other
operating
features
include:
voice
oper-
|
ated
(VOX)
and
push-to-talk
(PTT)
control
in
the
SSB
mode;
break-in
keying
in
the
CW
mode;
built-in
antenna
change-over
relay;
switched
120
VAC
to
operate
an
external
an-
tenna
relay;
crystal
filter
type
SSB
generator;
HEATHEIT®
and
automatic
level
control
to
prevent
distor-
tion
while
providing
high
talk
power,
The
large
circular
dial
has
calibration
marks
every
kilo-
hertz
and
covers
100
kilohertz
for
every
revo-
lution
to
provide
a
bandspread
equal
to
approxi-
mately
10
feet
per
megahertz,
A
slide-rule-
type
dial
pointer
clearly
indicates
the
number
of
rotations
of
the
circular
dial,
The
knob-to-dial
ratio
is
approximately
4:1,
All-aluminum
metal
parts
provide
light-weight
and
sturdy
construction,
Assembly
time-saving
features
include
circuit
boards,
wiring
cable
assemblies,
and
a
preassembled
LMO
tuning
unit,
The
transformer-operated,
silicon
diode
power
supply
is
a
long-life,
low-heat
power
source,
Refer
to
the
''Kit
Builders
Guide"
for
complete
information
on
parts
identification,
tools,
wiring,
soldering,
and
step-by-step
assembly
proced-
ures,
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