Realistic dx 75 owners manual

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7? 541.1517;
1 COMMUNICATION RECEIVER

OPERATING

AND
SERVICE
INSTRUCTIONS

MODEL, DX-75

RADIO SHACK CORPORATION _
DIVISION OF TANDY CORPORATION

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INTRODUCTION

The Realistic DX -75 Communications Receiver is designed
to ; wide both the usual long wave" standard broadcast
reception and "short wave" international broadcast recep-
tion. Therefore, it allows the listener to span the oceans
and travel around the world by means of radio waves.

of radio waves.

Short wave radio signals are used forlong distance trans .
mission because of the way they are reflected back to
earth by the ionosphere. Radiation from space (primarily
iron) the shrocauses ionization olthe layers of gases high
above the earth. Short wuw' radio signals Will not pone -
[rate these ionized gases; instead, they bounce back to
earth much like a stone skips across the surface of quiet
water. Variations in the reflecting characteristics of the
ionosphere due to sun spots, seasons, time of day, etc.,
produce periods when the skipping of short wave signals
is especially effective. Since many of these periods oc»
our in regular cycles the listener may develop a sched-
ule of the best times to listen for signals from distant

parts of the world.

Listed below are some of the many types of broadcasts
that can be heard on the short wave bands:

Amateur Radio (Ham)

Mobile Radio - Telephone

Military

Citizens Band (CB)

lnt, Short Wave (Voice of America, etc.)

Standard Time Signals (WWV)

GENERAL

The Realistic DX-7S is a four band AM receiver which
covers the standard broadcast frequencies in one band:
550 to 1600 KC; and the short wave frequencies in
three bands: 1.6 to 4.4 MC; 4,5 to ll MC; ll to 30 MC.
Utilizing four tubes (one multipurpose tube affords five
tube performance)plus rectifier, the superhetrodyne cir-
cuitls designed to operate from a 105 to lZSvolt, 60 cycle
power source. A power transformer eliminates the haz-
ard of a hot chasms . Housed in a vinyl clad steel table
model cabinet, the receiver features an eight inch "slide
rule" type dial with continuous tuning of all four bands,
plus bandspread for precise location of signals on the

busy short wave bandsi