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Cat. No. 20-209A
OWNER’S MANUAL
Please read before using this equipment.
DX-350
AM/FM/LW/SW1–9 12-Band
Portable Receiver
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INTRODUCTION
Your RadioShack DX-350 is a 12-Band Portable Receiver for AM
(MW), FM, long wave and worldwide shortwave broadcasts. Its
nine shortwave bands put the world at your fingertips, with international broadcasts from Japan, Israel, England, Holland, Australia,
and other countries around the globe.
Because the receiver is so light and compact, you can carry it with
you wherever you go. You can power it from any of three sources:
internal batteries, standard AC, or vehicle battery power. To get the
most enjoyment from your receiver, take a few minutes to completely read this manual before using the DX-350.
FCC NOTICE
Your receiver might cause radio or TV interference, even when it is
operating properly. To determine whether or not your receiver is
causing the interference, turn off your receiver. If the interference
goes away, your receiver is causing the interference. Try to eliminate the interference by:
• Moving your receiver away from another receiver
• Connecting your receiver to an outlet that is on a different electrical circuit from the other receiver
• Contacting your local RadioShack store for help
If you cannot eliminate the interference, the FCC requires that you
stop using your receiver.
© 1997 Tandy Corporation.
All Rights Reserved.
RadioShack is a trademark used by Tandy Corporation.
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CONTENTS
Choosing a Power Supply .........................................................
Installing Batteries .................................................................
Using Standard AC Power .....................................................
Using a Vehicle Battery .........................................................
4
4
5
6
Operation .....................................................................................
Tuning the Receiver ..............................................................
Adjusting the Antennas .........................................................
Using Headphones ................................................................
Listening Safely ..............................................................
Traffic Safety ..................................................................
7
7
7
8
8
9
Listening Guide .........................................................................
Band Allocation ...................................................................
Ham Radio Frequencies ...............................................
Time Standard Frequencies .........................................
International Radio Stations .........................................
Frequency Conversion ........................................................
10
10
10
11
11
12
Care and Maintenance .............................................................. 13
Specifications ........................................................................... 15
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CHOOSING A POWER SUPPLY
You can power the receiver using either:
• Four AA batteries
• Standard AC power (with an optional AC adapter)
• 12-volt DC vehicle power (with an optional DC adapter)
INSTALLING BATTERIES
You need four AA batteries (not supplied) to power your receiver.
For the best results, we recommend alkaline batteries, such as RadioShack Cat. No. 23-552.
Cautions:
• Use only fresh batteries of the required size and recommended
type.
• Do not mix old and new batteries, different types of batteries
(standard, alkaline, or rechargeable), or rechargeable batteries
of different capacities.
Illus cover removal, battery installation, and
cover replacement
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1. Open the battery compartment by pushing the cover in the
direction of the arrow.
2. Install four AA batteries in the battery compartment as indicated by the polarity symbols (+ and –) mark on the back of the
receiver. Place the batteries on top of the ribbon so you can
easily lift them out later.
3. Replace the cover.
USING STANDARD AC POWER
You can power the receiver from standard AC power with an AC
adapter (such as Cat. No. 273-1454, not supplied).
Insert the adapter’s small connector into the receiver’s DC 6V jack.
Then plug the adapter into a standard AC outlet. Internal batteries
automatically disconnect.
Illustration of DC 6V jack
w/adapter cord to AC outlet
Caution: The recommended adapter supplies 6 volts DC and delivers at least 150 milliamps with its center tip set to negative. Using
an adapter that does not meet these specifications could damage
the receiver or the adapter.
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USING A VEHICLE BATTERY
With a DC adapter (such as Cat. No. 14-844, not supplied), you can
operate the receiver in a car, boat, or recreational vehicle equipped
with a 12-volt DC, negative-ground electrical system.
Insert the adapter’s barrel plug into the receiver’s DC 6V jack. Set
the adapter’s 6V/9V selector to 6V. Then plug the other end of the
adapter into the vehicle’s cigarette-lighter socket. Internal batteries
automatically disconnect.
Cautions:
• The recommended adapter supplies 6 volts DC and delivers at
least 300 milliamps with its center tip set to negative. Using an
adapter that does not meet the specifications could damage
the receiver or the adapter.
• Do not let the adapter’s barrel plug contact any metal parts of
the vehicle when you plug the adapter into the lighter socket.
This can damage the adapter or the vehicle’s electrical system.
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OPERATION
TUNING THE RECEIVER
1. To turn on the receiver, press POWER.
2. Set SW/LW/AM/FM to the desired band. For shortwave, also set
SW BAND 1–9 to one of the bands from 1 to 9.
See “Listening Guide” on Page 10 for more information about
each band.
3. Adjust TUNING to tune to the desired station. The TUNING indicator lights when a station is tuned properly.
4. Set VOLUME to a comfortable listening level.
ADJUSTING THE ANTENNAS
For the best reception, adjust the antenna according to this chart.
Band
Frequency
Range
Antenna
AM
535–1705
kHz
Internal — Rotate the receiver for the best reception
LW
150–281
kHz
Internal — Rotate the receiver for the best reception
FM
87.5–108
MHz
Telescoping — Extend fully
and swivel for the best reception
SW 1–9
5.85–26.10
MHz
Telescoping — Extend fully.
do not swivel
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USING HEADPHONES
Sometimes headphones can capture the subtle difference between
signals and the surrounding noise that often occurs at night. Be
sure that the headphones (not supplied) have a 1/8-inch plug. Insert
the plug into the jack on the left of the receiver. When you plug in
the headphones, the speaker is silenced. You will find a wide selection of headphones at your local RadioShack store.
Illustration of headphones jack location
Listening Safely
To protect your hearing, follow these guidelines when you use
headphones.
• Set the volume to the lowest setting before you begin listening.
After you begin listening, adjust the volume to a comfortable
level.
• Do not listen at extremely high volume levels. Extended highvolume listening can lead to permanent hearing loss.
• Once you set the volume, do not increase it. Over time, your
ears adapt to the volume level, so a volume level that does not
cause discomfort might still damage your hearing.
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Traffic Safety
Do not use headphones with your receiver when operating a motor
vehicle or riding a bicycle in or near traffic. Doing so can create a
traffic hazard and could be illegal in some areas.
If you use headphones with your receiver while riding a bicycle, be
very careful. Do not listen to a continuous broadcast. Even though
some earphones/headphones let you hear some outside sounds
when listening at normal volume levels, they still can present a traffic hazard.
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LISTENING GUIDE
Worldwide, there are thousands of shortwave listeners. The shortwave hobby can be very exciting. Newscasts of a country where
important events are taking place give you a sense of immediacy
and participation that reports on local stations cannot deliver.
Being a shortwave listener requires no special knowledge. Random
tuning is a good way to become acquainted with various bands and
stations. But as you gain expertise, you will probably acquire special listening techniques.
BAND ALLOCATION
Certain portions of the radio frequency spectrum are set aside for
specific purposes. Each range of frequencies is called a radio band.
See “Specifications” on Page 15 for the band frequencies. The following sections list some of the most interesting band allocations.
Ham Radio Frequencies
Ham radio operators often broadcast emergency information when
other means of communication break down. They use Morse code
(called continuous wave) and single sideband. The following chart
shows the continuous wave frequencies you can receive on the
DX-350. The DX-350 cannot receive single sideband signals.
3,500–3,800 kHz
7,000–7,150 kHz
14,000–14,200 kHz
21,000–21,250 kHz
28,000–28,500 kHz
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Time Standard Frequencies
The National Bureau of Standards operates station WWV in Fort
Collins, Colorado, on 2.500, 5.000, 10.000, 15.000, and 20.000
MHz. These stations broadcast the exact time of day at specified
intervals.
You can pick up Canada’s station CHU on 7.335 MHz.
You can pick up Australia’s station VNG on 12.000 MHz.
International Radio Stations
International commercial broadcasts are found in several bands.
You can hear these most often during the evening hours between
6:00 PM and midnight (your time). Programming (often in English)
usually contains news, commentaries, music, and special features
reflecting the culture of the specific country.
European stations often list a frequency by giving its wavelength.
For example, you might hear “the 19-meter band.” (See “Frequency
Conversion” on Page 12.)
Notes:
• The following table shows some of the most popular bands.
Band (in meters)
Frequency Range (in MHz)
49
5.950–6.200
*41
7.100–7.30
31
9.400–9.900
25
11.600–12.100
19
15.100–15.800
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Band (in meters)
Frequency Range (in MHz)
16
17.480–17.900
13
21.450–21.850
11
25.670–26.100
* The 41-meter band is shared by ham operators in the United States and international stations.
• Stations can change frequencies. For an up-to-date listing, see
RadioShack’s Listening to Short Wave (Cat. No. 62-1021) or
other popular communications magazines.
FREQUENCY CONVERSION
The location of a station can be expressed in frequency (kHz or
MHz) or in wavelength (meters). To find your way around international broadcasts, it is helpful to be able to convert frequencies from
MHz to kHz, kHz to MHz, and MHz to meters.
1 MHz (million) = 1,000 kHz (thousand)
To convert MHz to kHz, multiple by 1,000. For example:
9.62 MHz × 1,000 = 9620 kHz
To convert from kHz to MHz, divide by 1,000. For example:
2780 kHz/1,000 = 2.780 MHz
To convert from MHz to meters, divide 300 by the number of MHz.
For example:
300/7.1 MHz = 42.25 meters.
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CARE AND MAINTENANCE
Your DX-350 is an example of superior design and craftsmanship.
The following suggestions will help you care for the DX-350 so you
can enjoy it for years.
Keep the DX-350 dry. If it gets wet, wipe it dry immediately. Liquids might contain minerals that can
corrode the electronic circuits.
Use and store the DX-350 only in normal temperature environments. High temperatures can shorten
the life of electronic devices, damage batteries, and
distort or melt plastic parts.
Handle the DX-350 gently and carefully. Dropping it
can damage circuit boards and cases and can
cause the DX-350 to work improperly.
Keep the DX-350 away from dust and dirt, which
can cause premature wear of parts.
Wipe the DX-350 with a dampened cloth occasionally to keep it looking new. Do not use harsh chemicals, cleaning solvents, or strong detergents to
clean the DX-350.
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Use only fresh batteries of the recommended size
and type. Always remove old or weak batteries.
They can leak chemicals that destroy electronic circuits.
Modifying or tampering with the DX-350’s internal components can
cause a malfunction and might invalidate the it’s warranty and void
your FCC authorization to use it. If your DX-350 is not performing
as it should, take it to your local RadioShack store for assistance.
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SPECIFICATIONS
Power Supply ............................................................ 4 AA batteries
AC/DC adapter 6V 150 mA center negative
Frequency Ranges:
FM .................................................................... 87.5–108 MHz
AM .................................................................... 530–1710 kHz
LW ...................................................................... 150–281 kHz
SW1 (49 m) ..................................................... 5.90–6.20 MHz
SW2 (41 m) ..................................................... 7.10–7.35 MHz
SW3 (31 m) ..................................................... 9.40–9.90 MHz
SW4 (25 m) ................................................. 11.60–12.10 MHz
SW5 (21 m) ................................................. 13.57–13.87 MHz
SW6 (19 m) ................................................. 15.10–15.80 MHz
SW7 (16 m) ................................................. 17.48–17.90 MHz
SW8 (13 m) ................................................. 21.45–21.85 MHz
SW9 (11 m) .................................................. 25.67–26.10 MHz
Sensitivity: ........................................ Max for 50 mW output 8 Ohm
631 µV at 1,000 kHz
Usable sensitivity for 20 dB S/N 1,000 µV at 1,000 kHz
Speaker ................................................. 2.5 Inch, 8 Ohm, 0.5 Watt
Output Power ....... 200 mW 8 Ohm (10% THD) for built-in speaker
10 mW per channel for headphones
Headphones Jack ................................................ 3.5 mm, 32 Ohm
Dimensions (HWD) ............................................ 4 × 7 × 11/2 Inches
(105 × 176 x 39 mm)
Weight (without batteries) ...................................................... 14 oz
(400 g)
Specifications are typical; individual units might vary. Specifications
are subject to change and improvement without notice.
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Limited Ninety-Day Warranty
This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for ninety (90) days from the date of purchase from RadioShack company-owned stores and authorized RadioShack
franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES
NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING
THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN,
RadioShack SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER
OR ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY LIABILITY,
LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS
WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING
FROM INCONVENIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR
PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGES.
Some states do not allow the limitations on how long an implied warranty lasts or
the exclusion of incidental or consequential damages, so the above limitations or
exclusions may not apply to you.
In the event of a product defect during the warranty period, take the product and
the RadioShack sales receipt as proof of purchase date to any RadioShack store.
RadioShack will, at its option, unless otherwise provided by law: (a) correct the defect by product repair without charge for parts and labor; (b) replace the product
with one of the same or similar design; or (c) refund the purchase price. All replaced parts and products, and products on which a refund is made, become the
property of RadioShack. New or reconditioned parts and products may be used in
the performance of warranty service. Repaired or replaced parts and products are
warranted for the remainder of the original warranty period. You will be charged for
repair or replacement of the product made after the expiration of the warranty period.
This warranty does not cover: (a) damage or failure caused by or attributable to
acts of God, abuse, accident, misuse, improper or abnormal usage, failure to follow
instructions, improper installation or maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs other than those provided by a
RadioShack Authorized Service Facility; (c) consumables such as fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f)
costs of product removal, installation, set-up service adjustment or reinstallation.
This warranty gives you specific legal rights, and you may also have other rights
which vary from state to state.
RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600,
Fort Worth, TX 76102
We Service What We Sell
3/97
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
4A7
Printed in Taiwan