Realistic DX-75 User Manual
Ltstlc-
COM
MUN
INSTRUCTIONS
I
OPERATING
SERVICE
AT I ON
C
AND
REC
IV
E
R
E
M(IDEL
RADIO
SHACK
DIVISION
OF
TANDY
DX.I5
CORPORATION
COR,PORATION
#
INTRODUCTION
The Realistic
rvideboth
to
I
-75
DX
Communications Receiver is desig'ned
usual
"long
wave" standard broadcast
the
recei)tion and'short wave' international
tion. Therefore,
ald
travel around
of
radio
waves.
Short wave radr,r signals
nission
becausc
it allows the listener to
the
world
means of
by
arcused forlong
of the way they
are reflectcd back
earth by the ionosplx'rc. Radiation frorn
Ironr thc
above thc carth.
trate t.hcse tonized gascs; rnst.ead,
earth much like a stone skips
watcr.
sut)causes ioniz:ltioll olthe loycrs
wrr,rt
Shott
r-aclio signals rvill not
they
across
the
Variations
in thc reflccting
charactcristics
ionosphere due to sun spots, scasons,
producc periods
is
espccially effective.
cur h regular
ule
the
of
Darts
best times to
of
the world.
the
when
cycles the
skipping
nrany of these
Sincc
listener may
listen for
of short wave signals
sisnals from distant
the
recep-
oceans
broadcast
span
radio waves.
distance
space
trans-
(primarily
oI gascs higlt
pcne-
bounce back
surface
to
of quiet
of
tlre
time of day, etc.,
periods
oc-
develop a sched-
to
Listed
below are
[hat can be heard
sone
on the short wave bands:
Amateur
Mobile
Military
Citizens
lnt.
Short Wave
Standard Time Sigrnls
Thc Realistic DX-75
covcrs the
550 to 1600
tlrree
Utilizing four
perf
tube
cuit is
power
ard of a
model
rule" type
plus
busy
standarcl
KC; and the
bands: 1.6
to 4.4 MC; 4.5 to fl
tubes
o rmance
plus
)
designed to operate
source. A
hot
cabinet,
power
chassis.
the
dial with continuous tuning of
bandspread for
short
wave bands.
of the
(Ham)
Radio
Radio - Telepirone
(CB)
Band
types of
many
(Voice
of America, etc.
(WWV)
GENERAL
is a four band
broadcast
short
AM
frequencies
wave
receiver which
MC;
(one
multipurpose tube affords
rec tif ie
the
r,
105 to l25volt, 60
a
from
supe rhetrodyne c i r
transformer eliminates
Housed in a vinyl clad steel
receiver features
an eight
all four bands,
precise
location
of
signals
broadcasts
in
one band:
frequencies
ll
to 30MC.
five
cycle
the
haz
taple
"slide
inch
on
)
in
-
-
tie
SPECIF'ICATIONS
OPERATION
Ditncnsions
Wcight
Frequency Rangc
Sens itivity
Selectivity
Audio
Power
(net)
Orltput
Input Voltage
Consumption
INSTALLATION
Choice of a location for
several
oI
listencr,
outside
available
ed
be
The
however, an outside
ception
outside
as
signals.
lines, trees, buildings,
its
16 ga.
both the
should
storm
design
American
antenna handbooks
Connect the down
nal on
nal
power
power.
considerations.
lurnitur-c
that the selection
carefully
possible (up
supports
to a
in thc
roon,
and acccss to a
antenna. MarT hours
from a
short wave ll:cciver soitis
made,
antenna for
on
antenna
The
copper covered steel wire
antenna and the down lead. A lightening
be connected
damage.
refer to
the rear of
good
cord into
standard broadcast
antenna
the short
antenna
by glass
Radio Relay League, or to any
earth ground
wave bands. As a general
should
to I00
ft.)
should be mounted
to
For additional
'A.
R. R.
currently
lead from the
the receiver
standard
a
6-5/16 x
5
1
550
3.5prv
noisc
6 db
60 db
I
.5 warrs
105 to 125 volts, 60
14-I/4 x Lt)-17/32
pounds
to 1600
at
KC
20 MC
ratio with 30/s
14.5
dorvn,
I 25
dorvn,
(6
1.6
KC;
KC
to
db
signal-to-
mocl .
cps
30
MC
)
35 watts
tlrc
rece iver may bc
Tlrese include the arrangement
thc
comfort
good
of
a location
is
high
be as
for best
etc.
orceranric insulators. No. 12 to
the
down
L. Antenna
available.
such as a water
receptacle
ancl
electrical
of listening enjoyrnent arc
for
is self-contained,
required for
practical
as
reception of
and should
,
(uninsulated)
lead for
information
Book"
of the
antenna
and connect the
providing
subject
convicncc of
ground
recommend-
the
DX-75
distance
and as long
short wave
away from
be
attached
is best
arrestor
protection
on
antenna
published
many
#2
to
the
#l
pipe.
Plug the
tl'rc
and an
re-
rule an
power
against
other
termi-
termi-
ff7
VAC
to
to
for
by
be
VOLUME
turns on
knob
BAND
switches antenna and local oscillator
ious tuning bands.
Ciockwise
powcl
rotation
and increascs
SE,LECTOR Rotation
Index numbers are
of
volume.
of
the Band
t]le
Volurne control
Selector knob
circuits for
located
the
near
var-
the
knob and at each end of the diai.
TUNING
tuning
BANDSPREAD
a fine tuning
mally
After
the rnain
reduces
BFO
Beat
!-requency
lation
usecl
contains no modulation
ceiver
range
signals
ANL
the Automatjc Noise
mize
downposition may
weak
er level
REC
/
this
slide switch to
turning
position
tion
without warTn-up or retuning.
PHONE
(50
to
nal
speaker.
vary the volume
Rotation
indicator
adjustmcnt
indicator
the
the
approximate
tuning
the
frequency
Clockwise rotation of
of the IF
fol single side band
proper
for
of this control
other than
ln
ON
of the Tuning
(red)
to move across
Rotation
should
of
the reception
of
be adjusted to the
knob causes
the
Bandspread
the dial
frequency has been tuned
lcrob, tl-rc bandspread
pinpoint
for
Oscillator
and
adjustrnent
selection
the
BFO
increases
control
signalby tlris oscillator. A
or
code telegraphy purposes,
must be
and
reception
may also
(Note:
improve
modulated in
settings in the
reception of
CW type).
position
rfie
up
this slide
.
loob
frequency.
SET
of
turns
the % of
CW signal,
switch
Limiter circuits designed
background noise, static, etc. Operation
benecessary
signals since the noise limiter
for reception of
suppresses
signals.
power
The
receiver
the STBY
to
the nrbes. Switching
may
be silenced
position
instantly returns tlle receiver
jack
This
provides
which
The
Volume control functions as
at
tie headphones.
aconnectionforheadphones
automatically
by moving
witiout actually
to
back
to normal
silences tlre inter-
STBY
off
1000 ohms)
the
main
affects
Nor-
position.
by use
gradually
signals,
on
modu-
the re-
lov/er
weak
activares
to mini-
in
the very
low-
all
REC
tfie
opera-
usual
of
a
as
t
,l
the
to
2
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