Heathkit SW-7800 - Page 5

Heathkit
Page
3
NTRODUCTION
The
Heathkit
Model SW-7800
General
Coverage
Re-
ceiver
is
a
synthesized
receiver
designed primarily
with
the
avid
shortwave
listener
in
mind.
It
covers
150
kHz
through
30
MHz
continuously
in
30
over-
lapping,
1
MHz
bands. Broadband
front-end
circuits
eliminate
the
need
to
tune
circuits
within
a
band.
Just turn
the
band
switch
and
select
the desired
fre-
quency
The
design
of
the
wide-band
front-end
stages
elimi-
nate
the
need
for
the
customary
RF
amplifier.
This
results
in
a
receiver
that
can
properly
handle
incom-
ing
signals
within
a
wide
dynamic
range.
An
up-
converting,
double-conversion
mixing
scheme
is
used
to
provide
excellent
image
rejection.
You
may
operate
this
Receiver
with
its
built-in
power
supply
or,
if
you
wish
to
operate
mobile,
use
any
11
to
15-volt
DC
source
(capable
of
supplying
at
least
3/4
amperes).
The
following
features
are
also
included
in
your
Re-
ceiver:
©
Five-digit
LED
display
providing
1
kHz
fre-
quency
resolution,
©
Lower
sideband
(LSB),
continuous
wave-upper
sideband
(CW-USB),
amplitude
modulation
(AM)
—
wide
and
narrow
©
Excellent
sensitivity
and
selectivity
©
AGC
time-constant
switch
©
Muting
provision
allows
operation
with
a
transmitter
©
Local/DX
switch
to
protect
against
overlos
from
very
strong
local
stations.
©
Front
panel
jack
to
allow
tape
recordings
of
re-
ceived
material
—
unaffected
by
the
setting
of
the
Volume
control
©
Portable
capability
and low
power
consump-
tion.
©
Telescoping
whip
antenna
included
for
local
reception
and
portable
operation.
°
Comprehensive
circuit
description
and
servic-
ing
details
aid
in
solving
problems
NOTE:
To
align
this
Receiver,
you
should
have
a
high-input
impedance
multimeter