DX-440 OWNER'S MANUAL AM/FM DIRECT ENTRY COMMUNICATIONS RECEIVER

RADIO SHACK LIMITED WARRANTY Please read before using this equipment This product is warranted against defects for 90 days from date of purchase from Radio Shack company-owned stores and authorized Radio Shack franchisees and dealers. Within this period, we will repair it without charge for parts and labor. Simply bring your Radio Shack sales slip as proof of purchase date to any Radio Shack store. Warranty does not cover transportation costs. Nor does it cover a product subjected to misuse or accidental damage. EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some states do not permit limitation or exclusion of implied warranties; therefore, the aforesaid limitation(s) or exclusion(s) may not apply to the purchaser. This warranty gives you specific legal rights and you may also have olher rights which vary from state to slals. We Service What We Sell

------i II VOICE OF THE WDF!LP

RADIO SHACK A Division of Tandy Corporation Cat. No. 20·221A Fort Worth, Texas 76102 ~) 12A7 Printed in Taiwan ~EALIShc.:... CONTENTS INTRODUCTION

Introduction 3 You now have the world at your finger­ The radio uses the latest solid-state Features 4 tips.Just press the buttons of yourDX­ technology to provide programming, Control Locations 5 440 to listen to a variety of voices from a large liquid crystal display (LCD), Choosing a Power Supply...... 7 around the world. In addition to your and a host of other convenient . Preliminary Settings 10 local AM and FM broadcast stations, features. Because this product is so Tuning the Radio 13 you can now enjoy broadcasts from versatile, please take a few minutes Clock Radio Operation 23 London, Tokyo, Paris, Berlin, and to review the material in this manual Special Tuning Techniques and Controls 26 Moscow. before you proceed. You'll enjoy the Special SSB/CW Reception Techniques 28 radio much more if you do. Using the Shoulder Strap 33 This entertainment grade, general pur­ Choosing an Antenna 34 pose, communications receiver covers Welcome to the world of the short­ System Grounding 36 an extremely wide range of frequencies wave listener. Band Allocation 37 that also include shortwave and special services such as marine and navigation. The Shortwave Hooby 38 If you understand international Morse Listening Notes 40 For your own protection, we urge you code, you can listen in and decode a to record the serial number of this unit Frequency Conversion 41 wide variety of transmissions. in the space provided below. The serial ~~~ ...... •...... ~ number is located inside of the battery Troubleshooting Guide 46 compartment Care and Maintenance 48 Specifications 50 Serial Numberr ~

© 1987 Tandy Corporation. All Rights Reserved. Realistic is a registered trademark of Tandy Corporation.

2 3 FEATURES CONTROL LOCATIONS

• Wide Tuning Range_lets you receive • Supplemental Tuning Controls­ 1. lIGHT Button 18. BFO OUT/IN Switch more stations from more places than allow adjustment for maximum clarity 2. TIMER Button 19. FM/(MONO/STEREO)/AM(WIDE/ 3. SLEEP Button ever before. of the selected frequency. NARROW) Mode Selector 4. SIGNAL Strength Indicators 20. STORE Button 5. LCD Display 21. RECALL Button • Fast Response LCD-shows you the • Dual Function Mode Switch-allows 6.Telescopic Antenna 22. UP Button frequency you select in large, easy­ you to display the frequency or the 7. FM STEREO Indicator 23. DOWN Button to-read numbers. time on the LCD panel. 8. POWER On Indicator 24. SCAN Button 9. POWER Switch 25. MODE Button 10. VOLUME Control 26. EXECUTE Button • Direct Acc~ss Keypad-lets you in­ • Scanning Control-lets you check 11. Dual-Function Tuning Control 27. Band Selectors stantly tune in any desired frequency the various transmissions on a certain 12. BALANCE Control 28. Number Entry Buttons from 87.5 to 108 MHz on the FM band and lock on to the chosen 13. TREBLE Control 29. Time Mode/SEConds Reset button band and from 150 kHz to 29,999 frequency. 14. BASS Control 30. STEREO headPHONES Jack 15. RF GAIN Control (3.5mm) kHz on the AM band. 16. BFO PITCH Control 31. DC IN 9V Jack • Full Range Tone Controls-lets you 17. LOCK Switch • Up to 9 Storable Frequencies-give cuStomize the sound for clarity and you instant response for your favorite listening comfort. stations or transmission sources. • Stereo Headphones Jack- lets you .Multiple Power Source Operation­ listen to FM Stereo programs in full means you can use it virtually any­ stereo. where in the world.

.~ijJr---17 W--l--+---j--l-l--j~+---U f--- rT IT 272625 20 2928 2423 2221 19 18

4 5 CHOOSING A POWER SUPPLY

32. Folding Stand 35. Battery Compartment You can operate the DX-440 using: that you can lift them easily for 33. EXTernal Antenna'Jack 36. 9k/10kHz Step SWitch 34. EXTernal/INTernal Antenna (beneath batteries) replacement.) • Six alkaline D batteries and two AA Selector 37. Battery Removal Strap batteries.

• Household AC (with an optional AC adapter)

•A 12-Volt DC automotive battery (with an optional DC adapter)

INSTALLING BATIERIES 1. Press the latch on the battery com­ partment cover in the direction of the OPEN label, and lift the cover off.

32 Note: Before installing the next set of batteries, verify that the frequency 33 step selector switch is set to the 34 position correct for your country. In the USA, move the swifch to the 10K 35 position. In other countries, set it to 9K. 36 37 1 '"

2. Insert two AA alkaline batteries (such as Radio ShackCat. No .23-552) in the smaller battery chamber within the main compartment. Position them as illustrated on the back of the radio.

(Place these batteries and the next set of batteries on top of their re­ spective battery removal ribbons so

6 7 3. Insert six D batteries in the main bat­ USING HOUSEHOLD AC USING AN AUTOMOTIVE tery compartment. Position them as BATIERY shown in the illustration on the back You can power the DX-440 from house­ of the radio. For best results, use hold AC using an optional AC adapter, You can operate the DX-440 in a car, Note: When you connect the adapter, alkaline batteries such as Radio Cat. No. 273-1455. Plug the small con­ boat, or recreational vehicle that is the DX-440 automatically disconnects Shack® Cat. No. 23-550. nector of the adapter into the DC IN 9V equipped with a 12 Volt DC, negative the internal batteries. socket on the side of the unit. Plug the ground battery. Use a DC adapter (Cat. adapter into a standard household No. 14-844). Caution :Do not let the adapter's barrel outlet. plug contact any metal parts of the vehicle when the adapter is plugged into Note: When you use AC, the DX-440 the lighter socket of the vehicle but not automatically disconnects the internal yet plugged into the DX-440. A harmful batteries. short can occur that can damage the adapter or the vehicle's electrical system.

14-844 DC Adapter

273-1455 Insert the adapter plug into the jack AC Adapter marked DC IN 9V on the side of the 4. Insert the bottom projections on the DX-440. Plug the other end of the edge of the battery compartment adapter into the lighter socket of the cover inside the lower edge of the vehicle. compartment opening. Lower the cover, and snap the top latch down until it clicks closed. = oPHON[ OCINg~o ~

o L.....l L..-

L Bottom prOjectionJ

8 9 PRELIMINARY SETTINGS

SETTING THE CLOCK 4. PresstheO/SEC button. The display 1 2 3 The display shows the time in a 24-hour because mostshortwavestations sched­ shows the minutes and seconds set- CJ CJ D mode except when you are tuning a ule their broadcasts on the basis of ting. Press the STORE button to 4 5 6 station or performing some other opera­ Greenwich Mean Time which is a 24­ reset the seconds to 00 and the CJ D CJ tion. The radio uses the 24-hour mode hour clock. display, return to the hours and 7 8 9 minutes. CJ CJ CJ O/SEC EXECUTE The clock starts when you install the Note: When "CLOCK' IS flashing, [ two AA batteries. The display shows a/SEC button does not function. CiJ 1 CLOCK 0:00. . .. -- I_8r5-,08MH.i 1.15()-281kH.! ,_ ~2Q-",:m'H,II_'50 ·~ool){l.H.1 Note: If after installing the two AAbatteries -, - ~ n,nn ['~"e:;J the display does not show CLOCK 0:00, -=----r< 'l -=--..r' L/I'_' LI ~ Jb"m~1 !~~~e~--] remove the batteries and install them ~ CLOCK sw ______~ one minutes later. The display will show 1IiI ~I~ ~ Ui81~~J~l~~~;~]lil~~~"' CLOCK 0:00· SELECTING A BAND AND TURNING ON POWER

1. Press the MODE button. MODE STORE The radio has five band select buttons ct=J beneath the EXECUTE button. SCAN RECALL )( DOD 4 5 6 DOWN UP 1 [ CJ CJ D 7 8 9 2. Press the STORE button. CLOCK MODE STORE CJ CJ CJ flashes in the display for five seconds. C~Lf=J O/SEC EXECUTE SCAN RECALL CJ () ()(I FM AM LW MW SW DOWN UP ~)LJ 00000

3. During this period press the UP or MODE STORE or DOWN buttons to reach the correct ,----,I (I time in hours and minutes (or, rotate SCAN RECALL the tuning knob to qUickly reach the ~--') (~--' correct setting). Note: digit of time can be adjusted only W~ when "CLOCK" is flashing in the display.

10 11 TUNING THE RADIO

ADJUSTING THE ANTENNA Band Frequency Service Locate the band to which you want to (Button) Min Max listen in the following chart. Adjust the antenna as indicated. FM 87.5 108 MHz Normal FM broadcasts BAND FREQUENCY ANTENNA AM 150 29999 kHz Entire AM Band RANGE LW 150 281 kHz Longwave MW 520 - 1620 kHz Internal - Rotate radio MW 520 1620 kHz Normal AM broadcasts for best reception

SW 2300 26100 kHz Shortwave in 12 sub-bands

Note: Each time you select SW, the respond to the wavelengths of each LW 150 - 281 kHz Internal - Rotate radio radio steps through 12 sub-bands, each band. Refer to "The Shortwave Hobby" band covering as little as 100 kHz to as section for additional information. for best reception much as 500 kHz. The sub-bands cor-

1. Press the POWER button. The

POWER indicator lights. The display POWER shows the last band and frequency I I FM 87.5- 108 MHz Telescopic - Extend fUlly ~ you selected. Swivel for best MINI IIII I III I IMAX VOLUME CEIIlIIIIlIlIC:'*' reception

2. Press the band button of your choice. The display shows the band you FM AM LW MW sw selected and a random frequency within that band. AM/SWj2300 - 26100 kHzTel~scoPiC - Extend fUlly 0 0 0 0 0 I Do not swivel

12 13 You can select a frequency using four 3. Press [7], [3], [0], [5J. As you press tuning methods: 1 2 3 each button, the LCD shows the number. QQ~Q,. • Direct Tuning DOD • Manual Tuning 7 8 9

~ DOD~ • Scan Tuning DrO/SEC EXECUTE ) • Memory Tuning 4. Press the EXECUTE button within DIRECT TUNING five seconds. The display shows the 0.00 frequency and meter band of 4 5 6 SW. DOD You can "key in" any frequency within 7 8 9 the range of the radio by selecting the ODD 4 5 6 DOD band in which that frequency operates o/sec E'XECUTE and then pressing the number buttons DOD of that frequency. 7 , 8 9 o ( zt 1 DOD 5. Extend the antenna fully stranght up. a/SEC EXECUTE for the best AM (SW) reception. o r ) FM AM lW MW SW 00000 L

Example: To tune to 7305 kHz on the AM band

1. Press the POWER button to turn on POWER the radio. I I

MINI III IIIII I IMAX VOLUME ~'*'

2. Press the AM band button. FM AM LW MW SW 0 0 0 0 0 '*' 14 15 CONTINUOUS TUNING 6. Adjust the VOLUME and TREBLE/ MINI III IIIII I lMAX VOLUME BASS tone controls for the desired ~ sound level. ... If you do not know the exact frequency LIIIIIIIIIIIR BALANCE MODE STORE ~ of the station you want to listen to, you [L_~ can check the broadcasts on a band '-----_) using the UP/DOWN buttons or the tun­ SCAN RECALL LO IIIIIIIII 11 HI TREBLE ... ~ ing knob. '------_~) [L_~ LO IIII II II I I t HI BASS ... c:::ElffiIII!ll OCJ Note: If you select the FM band and ,FM, ~ MONO STEREO BFO LOCK LIIIIIIIIIIIR BALANCE tune to an FM stereo station, move the .. DDllllllIIlIII1 FM mode switch to STEREO and ad- ~.. .'. .. just the BALANCE control for the best WIDE NARROW OUT IN OUT IN LAM-J lOlll11111111H1 TREBLE stereo headphone reproduction. c:::ElffiIII!ll The built in speaker is monaural. For MINI IIIIIIIII IMAX VOLUME the best sound result when listening with 0DilllI!IIIIlIl LOIIIIIIIIIIIHI BASS the built in speaker, do not forget to c:::ElffiIII!ll return the BALANCE control to the mid LIIII!111111R BALANCE position. ~ ... 1. Press the POWER button to turn on POWER LOIIIIIIIIIIIH! TREBLE the radio. c:::ElffiIII!ll MINI I IIIIIIII• IMAX VOLUME LO II j I II II I II HI BASS c:::ElffiIII!ll ~ 2. Select a band. 00000FM AM LW MW SW

3. a. Repeatedly press the UP or DOWN MODE STORE button until you reach the fre­ quency you want or reach a station )( you want to listen to. Press and SCAN RECALL hold the UP or DOWN buttons to ( ) ( ) rapidly change frequencies. ~ DOWN UP or 1# [ 1 [ 1

16 17 b. Rotate the tuning knob in either SCAN TUNING direction until you reach a desired LIIII111111IR BALANCE Use scan tuning to quickly locate a sta­ frequency or station with all five c:::E:IillIIIII tion or to monitor several stations within SIGNAL indicators light to obtain a band. best reception. LOIIIIIIIIIII>!1 TREBLE c:::E:IillIIIII 1. Turn on the radio. LO I II II I IIIII HI BASS POWER c:::E:IillIIIII

Note: When you repeatedly press an When you turn the TUNING knob UP or DOWN button, the frequen­ slowly in the AM band, the display cy on the FM band changes by changes in 1 kHz increments. Slightly 2. Select a band. FM AM LW MW SW .05 MHz each time you press a faster turning of the knob causes the button. On all other bands, the 00000 frequency changes by 1 kHz. display to change in 10kHz and very fast turning of the knob causes 3. Adjust the antenna or radio position When you press and hold an UP changes in 100 kHz increments. Turn according to the chosen band. or DOWN button, the frequency the knob quickly until the display on the FM band changes by nears the desired frequency. Then, .50 MHz. On all other bands, it turn it slowly for precise tuning. changes by 10kHz. ~ FM 4. Adjust the VOLUME,TREBlE,BASS and BALANCE MINI IIIIIIIII IMAX VOLUME CTIlIIIIlllICJ 4. Press the SCAN button. The radio LIIIIIIIIIIIR BALANCE begins to scan the frequencies in the SIGNAL c:::E:IillIIIII band, from lowest to highest. It stops MODE STORE when it reaches a station. The signal -=--./5" LOIIIIIIIIIIIHI TREBLE strength of the station registers on SCAN RECALL -=--./4 CTIlIIIIlllICJ the SIGNAL indicators. CEJ ~ When all five indicators light, SIGNAL DOWN UP ~ LOIIIIIIIIIIIHI BASS r,---~ c:::E:IillIIIII is the best. [) -=-./1

18 19 MEMORY TUNING 5. Press the SCAN button again to MODE STORE I IL(__I resume upward scanning. When the You can store up to nine different fre­ radio reaches the upper frequency SCAN RECALL quencies and have them available for limit of the band, it continues scan­ L=t=J (L....._I instant selection. ning starting again at the lowest fre­ DOWN UP quency on the band. L~[ I To Store a Frequency 6. You can fine tune the station using MODE STORE LI__I( ) the UP or DOWN buttons. Tune so 1. Turn on the radio. that the most SIGNAL indicators SCAN RECALL POWER light for best reception. ()(I II

MINI IIIIIIIII IMAX VOLUME QQ ~'*'

7. Adjust the VOLUMEffREBLE/BASS MINI IIIIIIIII IMAX VOLUME and BALANCE contorls. ~ 2. Tune to any frequency using any of , the previously mentioned techniques. LIIIIIIIIIIIR BALANCE

o::illIlIIII!II 3. Press the STORE button. The word MODE STORE LOIIIIIIIIIIIHI TREBLE STORE flashes on the display for I five seconds. During this period, 1ct=J CElIIllIlIICJ SCAN RECALL press one of the nine number but- I L_=:J tons. The display shows the storage I LOIIIIIIIIIIIHI BASS DOWN UP ~ number you selected and stores the L~[ chosen station in that memory I location. 1 2 3 Note: You do not have to store your first station as location 1. You can CJ CJ c::::J 4 5 6 choose any location as your first choice. CJ CJ c::::J 7 8 9 CJ CJ c::::J O/SEC EXECUTE CJ L )

20 21 CLOCK RADIO OPERATION

To Recall a Frequency You can use the DX-440 to wake you turns itself off after an interval between up to your favorite station everyday. 10 and 90 minutes. Make the following And before you retire for the evening, settings with the power off. 1. Turn on the radio. I I POWER you can set the timer so that the radio

_11111111111""'" VOLUME I I'*'• mllllllllllill I SETIING THE ALARM

..._-_.

2. Press the RECALL button. The dis- MODE STORE 1. Press the TIMER button. The display LIGHT TIMER SLEEP play flashes MEMO for five seconds. I ) ( ) shows 0:00 and STANDBY for five SCAN RECALL seconds. ( )L:4=J DOWN UP I ) [ I -~-'- .~-- i ------~~~-i----~~~~~~--~~~~_i ,,. D~""9 <";, "me. ,,-"" ,,~"" 1 2 3 number button for the desired station. I 2. During this period, press the STORE I 0 0 0 I MODE STORE The radio instantly tunes to that sta- 4 5 6 button. STANDBY starts to flash for j C tion and displays the frequency and ,I five seconds. ct=J 0 0 0 SCAN RECALL the storage number. 7 6 9 )I Note:If you make no selection while 0 0 0 DOWN UP STORE or MEMO flashes, the radio O/SEC EXECUTE L_J[~~ returns to the normal playing mode. 0 [ 1 3. During this period, use the UP and DOWN buttons or the tuning knob MODE STORE '----~) (L.-_~ to reach the daily turn-on time, using a 24 hour clock, displayed in hours SCAN RECALL ~~)(L.- __ and minutes. For example, to set the radio to turn on at 1:24 P. M. each day, use the buttons or turn the knob WW until the display shows 13:24.

LIIIIIIIIIIIR BALANCE c:::E:mIIJllCJ

LOIIIIIIIIIIIHI TREBLE c:::E:mIIJllCJ

LOIIIIIIIIIIIHI BASS c:::E:mIIJllCJ

22 23 4. When you reach the desired turn on MODE STORE 2. If you want fewer than 90 minutes LIGHT TIMER SLEEP time, press the MODE button to lock L4=l ( ) playing time, press the SLEEP button the setting. STANDBY stops flashing. SCAN RECALL again. Each time you press the but­ In a few seconds, the display reverts L=:JI ) ton, the playing time reduces by 10 to the clock mode and shows the DOWN UP minutes. current time. r I r I To turn off the radio before it normal­ POWER 5. Press the TIMER button once. ly turns itself off, press the POWER LIGHT TIMER SLEEP i' button. MINI IIIIIIII I jMAX VOLUME STANDBY disappears. I[~::J]I DDIIIllIlllIIlI

6. To check the daily turn on time, press UGHT TIMER SLEEP it again to display the STANDBY TIMER all the time. I[~ iD::-:JJ] i'

USING THE SLEEP TIMER

To have the radio turn itself off after a period of 90 minutes or less, proceed as follows:

1. Press the SLEEP button. The display shows SLEEP 90 in the upper right LIGHT TIMER SLEEP corner. I[I m::XjUl

SLEEP gO 1 I Ii

24 25 SPECIAL TUNING TECHNIQUES AND CONTROLS

In addition to the standard tuning oper­ AM NARROW!WIDE USING HEADPHONES USING THE LOCK CONTROL ations described previously, use the SELECTIVITY SWITCH following controls for special operations. While not a control, you might consider Use this switch to prevent unauthorized Some stations transmit their signal so using headphones to obtain the best use of the radio or to ensure that any RF GAIN CONTROL that very little space exists between reception. Many stations broadcast station you might be monitoring remains their airspace and the station next to marginal signals. Only headphones can tuned in. This control adjusts the receiver's sen­ them on the band. If, while tuning, you capture the subtle difference between sitivity. For shortwave reception, rotate encounter interference, caused by the the signal from such stations and the When you move the LOCK switch to the the control to the MAX position. This signal from an adjacent station, press surrounding noise often encountered at IN position, you disable the POWER provides the maximum sensitivity. When the button for the band you are listening night. Be sure that the headphones button and the tuning controls. If the you listen to the MW, standard AM to and select the NARROW position. terminate in a 1/8 inch plug, Insert the radio is on when you use the LOCK band, or LW band, rotate the control The interference is reduced or muted. plug into the PHONES jack on the side switch, you cannot turn off the radio or only as far as needed to obtain a good of the radio. When you plug the head­ change the current frequency. signal. If you turn the knob further you ,FM-, phones in, you silence the speaker. To release the LOCK function, set LOCK might hear a distorted signal. For weak MONO STEREO BFO LOCK switch to out position stations, rotate the control to the MAX ciIiII:I.m...... position. WIDE NARROW OUT IN OUT IN r FM , MONO STEREO BFO LOCK"- LAM~ '" •• BFO PITCH RF GAIN 'fH~ For full reception, leave the switch in o • •• • •• the WIDE position. o OCIN9i WIDE NARROW OUT IN OUT IN o LAM..J r FM, ~ MONO STEREO BFO LOCK ciIiII:I.m...... WIDE NARROW OUT IN OUT IN .,. LAM-J Because the radio can receive stereo If you encounter interference, adjust FM, when you listen to FM stereo the control in both directions until you broadcasts, be sure your headphones If you plan to listen to Morse code,refer­ obtain the best compromise between are designed for stereo operation so red to as CW (continuous wave), set the your station and the interference. that you can obtain the full benefit of BFO switch to IN position. If you en­ this feature. counter too much noise as you tune, set the AM NARROW/WIDE switch to NARROW position. BFO PITCH RF GAIN FM rFMi r- -, MONO STEREO BFO LOCK MONO STEREO BFO LOCK ~ ciIiII:I.m...... WIDE NARROW OUT IN OUT IN WIDE NARROW OUT IN OUT IN LAM--.J 001~SB USB MIN MAX LAM-.J

26 27 SPECIAL SSB/CW RECEPTION TECHNIQUES

Many stations transmit unmodulated Many stations transmit voice signals 4. Rotate the BFO PITCH control to the telegraph transmissions in the shortwave with a suppressed carrier in the single midpoint. BFO PITCH RF GAIN band. To receive these special Morse side band.(SSB),part of the radio trans­ code characters, the radio uses a mission spectrum that lies to the side '" special circuit, a beat-frequency oscill ­ of the primary frequency signal. Amat­ ator, to modify the transmitted signal so eurs tend who transmit voice below 10 00USB MIN that you can hear it. This particular type MHz use the lower side band (LSB). of telegraph transmission is called Con­ Above 10 MHz, they use the upper side 5. Rotate the RF GAIN control to the tinuous wave (CW) transmission. band (USB). Commercial utility stations MAX position BFO PITCH RF GAIN generally use the USB. A carrier has to be added to make these signals audible. BFO HTCH RF GAIN

TO RECIEVE CW 00use M,.. ..~x 6. Press the AM band button to select 1. Turn on the radio. the AM band. FM AM LW MW SW POWER 00000 i' MINI IIIIIII[I IMAX VOLUME i' ~ 7. Tune in the CW station using the

tuning knob, or enter the frequency LIIIIIIIIIIIR BALANCE 2. Extend the antenna fUlly straight up. using the direct access buttons. ~

LOIIIIIIIIIIIHI TREBLE ~

i' ODD 3. Set the BFO switch to IN. 4 5 6 iFMi CJ CJ CJ MONO STEREO BFO LOCK 7 8 9 !DIBmJ...... CJ CJ CJ WIDE NARROW OUT IN OUT iN O/SEC EXECUTE LAM-.J "*' CJ ( 1

28 29 8. Adjust the CW tone using the BFa 4. Rotate the BFa PITCH control to the BFO PITCH RF GAIN PITCH control. BFO PITCH RF GAIN LSB position for stations below 10 MHz or to the USB position for sta­ tions above 10MHz.

{OOlSB USB MIN MAX 0 oe, 0 '"...., "" "" "f' 9. Reduce strong signals by using the 5. Rotate the RF GAIN control to the BFO PITCH RF GAIN RF GAIN control. This also reduces MAX position. BFO PITCH RF GAIN interference and noise.

oe, 0 0 OOJUSB MIN '" "" """in , 6. Press the AM button to select the FM AM LW MW SW TO RECEIVE SSB VOICE AM band. 00000 1. Turn on the radio. i' POWER i' 7. Tune in the SSB station using the MINI IIIIIIIII IMAX VOLUME tuning knob, or enter the frequency LIIIIIIIIIIIR BALANCE c::EIDill1IIIII using the direct access buttons. 0illIIIIIIIIlrr

LOIIII111111lHI TREBLE 2. Extend the antenna fUlly, in a straight up position. 0illIIIIIIIIlrr

DOD DOD 7 8 9 3. Set the BFa switch to the IN position. rFMr 000 MONO STEREO BFO LOCK O/SEC EXECUTE ~...... o ( 1 WIDE NARROW OUT IN OUT IN LAM~ •

30 31 USING THE SHOULDER STRAP

8. Rotate the BFO PITCH control to ad- To Attach The Shoulder Strap RF GAIN just the signal quality. BFO PITCH 1. Insert about five inches of the end of the strap into the strap hanger.

0co, 0 ." ,"" ." 2. Pull the free end of the strap upward, ... Figure 1 and insert the end into the lower 9. Rotate the RF GAIN control to edge of the strap buckle as shown dampen strong signals. This dm im- BFC PITCH RF GAIN in Figure 1. prove signal clarity as well.

0co, 0." ." "" ~ 3. Pull at least three inches of the strap ------, Figure 2 Figure 3 Note: Before choosing another band. end through the buckle. See Figure More than 3·· set the RF GAIN control to MAX, and BFO PITCH RF GAIN 2. Then bring the end of the strap __i move the BFO switch to the OUT -T beneath the upper end of the buckle. More than 2'" position. Refer to Figure 3.

0co, OJMIN MAX "" iFMi MONO STEREO BFO lock ~ 4. Pull the free end taught. Be sure that ...... at least two inches of strap extend WIDE NARROW OUT IN OUT IN LAM~ --t- from the upper end of the buckle. Slip the extra strap beneath the belt loop. See Figure 4.

To remove the shoulder strap, follow Figure 5 Figure 6 Figure 7 Figures 5, 6, and 7 to reverse the procedure.

32 33 CHOOSING AN ANTENNA

The radio uses a telescoping antenna • Use a combination TV/FM antenna. Refer to the following charts. The first specified band. The second chart gives and an internal ferrite bar antenna for chart indicates the length of wire re­ you the required length of wire to receive Note reception of signals between 150 kHz quired for optimum performance on the the amateur radio operator's bands. and 1620 kHz. These antennas provide eTo use an external antenna, equipped with 300-ohm twinlead, acceptable reception for most situa­ connect the twinlead's terminals Frequency Antenna Wire Length (feet) tions. However, if you use an external to a 300 to 75-ohm matching trans­ antenna, you can receive more signals, former, Cat. No. 15-1253. 150 kHz 500 kHz 1440 Lengths generally Then insert the 75-ohm connector and the signals you receive will be 520 kHz 1600 kHz 441 impractical to erect better. of the transformer into an F-to-RCA adapter, Cat. No. 278-252. 1600 kHz 4500 kHz 153 Finally, insert the RCA type plug 4500 kHz 12000 kHz 57 of the adapter into the RCA antenna 12000 kHz 29999 kHz 22 FM BAND jack of the receiver. Be sure to move the antenna switch to EXT. • Use a set of VHF-TV rabbit ears. Those made for TV/FM coverage can • If your antenna uses 75 ohm coaxial Wave Length - Ham Band Antenna Wire Length (feet) help get better performance on the cable, attach the connector of the 246 FM band. cable to Cat. No. 278-252, which also 160 meter terminates in a RCA type plug. In­ 80 meter 117 sert the RCA plug into the ANT jack, 40 meter 66 and move the switch next to the jack 20 meter 33 to EXT. 15 meter 22 AM - SHORTWAVE BANDS For AM reception, you can use many different types of antennas. Unfor­ To calcuate antenna length for a This formula results in a half-wave tunately, no single antenna can effec­ specific frequency antenna. tively cover the entire frequency range of the DX-440, from 150 kHz to 29999 Length of a 1/2 wave antenna = kHz. You can determine the exact length of 468000 wire you need for a specific frequency Desired Frequency (kHz) A general purpose shortwave antenna, using the following information. Then, • Use an outdoor FM antenna. This such as Cat. No. 278-758, can provide obtain bare copper wire, stand-off in­ For example, to pick up international type, specially designed for optimum better reception than either of the built­ sulators, and an appropriate length of shortwave signals in the 19 meter band, FM performance, requires rooftop (or in antennas. However, if you want the lead-in wire. Be sure to use a static 15100 to 15600 kHz, pick a represen­ similar location) mounting. best possible reception on one specific discharge unit to guard against lightning tative frequency, such as 15350 kHz. band, your antenna must be a certain damage. For complete information, The formula then becomes: length. refer to The Radio Amateur Handbook, 468000 published by the American Radio =30 1/2 feet 15350 ~n,,-.}> .. Relay League...... -

34 35 SYSTEM GROUNDING BAND ALLOCATION

To ensure the best reception, always A suitable earth ground can be a clamp To avoid interference and confusion, Note that broadcasts and hams share connect a ground wire to the externai around a metal water pipe or a copper certain portions of the radio spectrum 7,100 -7,300 kHz, and interference is antenna jack. Connect the single wire rod driven several feet into the earth. have been set aside for specific pur­ heavy in that range. lead-in to the center terminal of the Radio Shack seils a copper ground rod poses. Perhaps the most familiar exam­ (Cal. No. 15-530) and the appropriate RCA plug. Connect.a suitable earth ple is 540 - 1600 kHz, the standard AM Broadcasts in tropical regions have ground to the outer terminal of the plug. hardware. broadcast band. special bands set aside for them. In such areas shortwave is the only way Ham radio operators use the foilowing to reach isolated locations: bands:

160 meters = 1,800 - 2,000 kHz 120 meters = 2,300 - 2,500 kHz 80 meters = 3,500 - 4,000 kHz 90 meters = 3,200 - 3,400 kHz 40 meters = 7,000 - 7,300 kHz 75 meters = 3,900 - 4,000 kHz $1 I 20 meters = 14,000 - 14,350 kHz 60 meters = 4,750 - 5,060 kHz 1 1 EXT.ANT· 15 meters = 21,000 - 21,450 kHz 10 meters = 28,000 - 29,700 kHz @I The rest of the shortwave range is filled with marine, aeronautical and military stations. Such stations usuaily use I International broadcasting stations have several bands set aside for them: either SSB or CW, and can be found outside the amateur and broadcast I ~ bands. 49 meters = 5,800 - 6,200 kHz 41 meters 7,100 - 7,500 kHz 31 meters = 9,500 - 9,900 kHz 25 meters = 11,650 - 12,050 kHz 19 meters = 15,100 - 15,600 kHz 16 meters = 17,550 - 17,900 kHz 13 meters = 21,450 - 21,850 kHz GROUND 11 meters = 25,600 - 26,100 kHz

36 37 THE SHORTWAVE HOBBY

Shortwave listening is a hobby with use Morse code (or CW, as they refer Ships and coastal stations can also be thousands of participants worldwide. to it) and SSB. The ham bands are heard on shortwave. Most communica­ While no special knowledge is required divided up into CW and SSB sections tions are in SSB and CWo One in­ for SWL, you will find your enjoyment in the following manner: teresting range is 2,000 - 2,300 kHz, increases with experience and special where the Coast Guard and many small techniques for listening. 3,500 - 3,800 kHz: CW boats can be heard. One frequency to 3,800 - 4,000 kHz: SSB watch is 2,182 kHz, which is an inter­ Random tuning on your DX-440 is a 7,000 - 7,150 kHz: CW national distress and emergency chan­ good idea if you've never owned a 7,150 - 7,300 kHz: SSB nel. Other bands in which to tune for Communications Receiver before. In 14,000 - 14,200 kHz: CW ships are: this way you can get acquainted with 14,200 - 14,350 kHz: SSB the various bands and the stations that 21,000 - 21,250 kHz: CW 4,063 - 4,139 kHz can be heard. But after you've been 21,250 - 21,450 kHz: SSB 4,361 - 4,438 kHz listening for a while you'll discover that 28,000 - 28,500 kHz: CW 8,195 - 8,181 kHz you can get more enjoyment by organ­ 28,500 - 29,700 kHz: SSB 12,330 - 12,420 KHz izing your listening efforts. 13,107 - 13,200 kHz These boundaries are not precisely 16,460 - 16,565 kHz Doing a little bit of library research can observed everywhere in the world, so increase your skill as a SWL. Read up don't be too surprised to find an SSB on radio propagation and theory; try to signal in the CW portion of a band and understand the conditions which make vice-versa. long distance reception possible. In your local library you can find such Some of the ranges where aircraft may valuable references as the World Radio be flying international routes use short­ Television Handbook and the Radio wave for their communications. Most Amateur's Handbook. Current intorma­ transmissions are in SSB, although tion can be found by consulting period­ some AM is still heard. Some of the icals dealing with communications and ranges where aircraft can be heard electronics. include:

Keep up to date on news events around 4,650 - 4,750 kHz the world. There's much interesting 6,545 - 6,765 kHz listening just tuning to the international 8,815 - 9,040 kHz service of a nation where an important 10,000 - 10,100 kHz event is taking place. 11,175 - 11,400 kHz 13,200 - 13,360 kHz Ham radio operators can be found in 15,010 - 15,100 kHz the bands listed in our Band Allocations 17,900 - 18,030 kHz section. You'll find that hams mainly

38 39 LISTENING NOTES FREQUENCY CONVERSION

If you have never tuned a shortwave respective countries. Among the stations Your communications receiver is Example: What is the wavelength of 7.1 receiver before, you may be a bit con­ that are listener favorites worldwide are calibrated in Megahertz (MHz) and MHz? Kilohertz (kHz) . as most communi­ fused by the wide variety of signals that Radio Japan, the British Broadcasting -:::-,....30,....0"..,..._ = 42.25 meters can be heard. To help you find your Company, Israel Radio, Radio Neder­ cations-type receivers are. You should 7.1 MHz way around the bands, here is a sum­ land in Holland and Radio Australia. be familiar with these terms: mary of what to expect. You'll soon discover which stations will be your personal favorites. Megahertz: Millions-of-hertz (or cycles­ The 150 - 540 kHz range is known as In tropical areas of the world, static per-second). A Megahertz is 1,000,000 the long wave band. You'll find recep­ makes reception on the standard AM hertz (Hz for short) or 1,000,000 cycles­ tion here best at night in your location. broadcasting band very difficult. This per-second. Mega means million. The majority of stations use Morse has resulted in special Tropical Bands code, although you will hear AM used set aside for nations located in tropics. Kilohertz: Thousands-of-hertz·A kilohertz for weather broadcasts. The largest Programming here is intended for local is 1,000 hertz. We use the abbreviation number of stations in this range are audiences and much of what can be kHz. Kilo means thousand. beacons for aircraft and marine naviga­ heard is a treat - exotic languages, tion. Beacons transmit their call letters beautiful and unusual music, etc. Some Meter: The term meter, as applied to continuously in Morse code at a slow English can be heard, however, from shortwave listening, refers to the speed. stations in Africa or the Pacific. wavelength of a radio frequency. In many parts fo the world, frequencies A manual on air or marine navigation, You'll find time standard stations quite are listed in meters, for example, inter­ available from your public library or a useful. These stations give out the ex­ national shortwave stations in the 19 marine supply store, will contain lists of act time of day at specified intervals. Meter band. European radio equipment these beacons and their locations. The National Bureau of Standards and stations often refer to the wave­ Weather broadcasts on AM often iden­ operates station WWV in Fort Collins, length of a station or band (in meters), tify themselves by their location instead Colorado on 2,500, 5,000, 10,000, rather than frequency (in MHz or kHz). of by call letters (such as "New Orleans 15,000, and 20,000 kHz. A man's voice Radio"). Many ship stations also use gives the time each minute along with The relationship of these three terms is: this range, with 500 kHz set aside by periodic reports on shortwave reception 1 MHz (million) = 1,000kHz (thousand) international agreement for distress conditions. The National Bureau of To change 9.62 MHz to kHz. we multiply and emergency calls. Standards also operates another sta­ by 1000. tion, WWVH, on the same frequencies 9.62 x 1000 = 9620 kHz International broadcast stations can be as WWV, in Hawaii. WWVH uses a To go the other way, from kHz to MHz, found in the bands indicated in our sec­ woman's voice to give the time. Some­ divide by 1000, A station at 3780 kHz is tion on Band Allocations. Many such times you can hear these two stations simultaneously. Other time standard 3780 = 3.780 MHz stations operate in English, and often 1000 stations are Canada's CHU on 3,330, can be heard during the evening hours To convert MHz to meters, use this (between 6:00PM and Midnight, your 7,335 and 14,670 kHz and VNG in formula: Australia on 4,500 and 12,000kHz. local time). Programming usually con­ 300 sists of news, commentaries, local Several other nations have similar Meters =-- MHz music, and features on life in their stations.

40 41 COUNTRY LOG

The following listing contains some of No attempt has been made to provide kHz STATION LOCATION REMARKS the more frequently heard stations on an accurate up-to-date listing. For a 3,223 Radio SR Swaziland shortwave. The stations listed can be yearly up-to-date listing, check the 3,265 Radio Mozambique Maputo, Mozambique Programs in Portuguese heard throughout the North American world radio television hand book. 3,300 Radio Cultural Guatemala City, Religious Programs Continent. All stations operate in Guatemala English unless otherwise specified. 3,380 Radio Iris Esmeraldas, Ecuador Programs in Spanish Most of these stations do not broadcast 3,385 FR3 Cayenne, Programs in French continuously. French Guiana 3,396 Radio Kaduna Kaduna, Nigeria Obviously, reception will vary on the dif­ 4,750 Radio Bertoua Bertoua, Cameroon ferent frequencies according to the 4,755 Imo Regional Radio Imo, Nigeria time of day and season of the year. 4,777 Radio-TV Gabon Libreville, Gabon Programs in French Remember that reception from different 4,795 Radio Nueva America La Paz, Bolivia Programs in Spanish parts of the world varies with the time 4,820 Radio Paz y Bien Ambala, Equador Programs in Spanish of day and the frequency to which your 4,832 Radio Reloj San Jose, Costa Rica Programs in Spanish DX-440 is tuned. Consult the section on 4,855 Radio Clube do Para Belem, Brazil Programs in Portuguese Changes in Reception for a more detail­ 4,890 National Broadcasting Port Moresby, ed explanation of these variations. Commission Papua New Guinea 4,915 Voice Kenya Nairobi, Kenya Remember also that the 7,000 - 7,300 4,920 AustralianBroadcasting Brisbane, Australia kHz range IS shared by hams and in­ Commission ternational broadcasts; consequently, 4,945 Radio Colosal Neiva, Colombia Programs in Spanish interference is severe in that range. 4,965 Radio Santa Fe Bogota, Colombia Programs in Spanish 4,980 Ecos del Torbes San Cristobal,Venezuela Programs in Sapnish While every effort has been made to en­ 4,990 Radio Barquisimeto Barquisimeto, Venezuela Programs in Spanish sure the accuracy of this list, stations 5,020 Solomon Islands Honiara, . can and do change frequencies. Check Broadcasting Service Solomon- Islands periodicals on communications and 5,057 Radio Gjirokaster Gjirokaster, Albania Programs in Albanian electronics for more current information 5,950 Guyana Broadcasting Georgetown, Guyana on station frequencies and schedules. Service 5,954 Radio Casino Puerto Limon, Costa Rica This list only contains broadcasting sta­ 5,960 Radio Canada Montreal, Canada tions which operate on fixed frequencies International with regular schedules. Ham military, 5,980 Radio RSA Johannesburg, marine and aeronautical stations operate South Africa on varied frequencies with irregular 6,005 CFCX Montreal, Canada schedules. 6,025 Radio Malaysia Kuala Lumpur, Malaysia Programs in Chinese 6,045 Radio Australia Lyndhurst, Australia These listings can change at any time 6,055 Nihon Shortwave Tokyo, Japan Programs in Japanese and are here for your reference only. Broadcasting Company

42 43 6,060 Radio Nacional Buenos Aires, Argentina Programs in spanish 11 ,850 Deutsche Welle Cologne, West Germany 6,075 Radio Sutatenza Bogota, Colombia Programs in Spanish 11,890 Voice of Chile Santiago, Chile 6,090 Radio Luxembourg Ville Louvigny, 11,900 Radio RSA Johannesburg, South Africa Luxembourg 11,910 BBC London, England 6,095 Polskie Radio Warsaw, Poland 11 ,930 Radio Havana Cuba Havana, Cuba 6,105 Radio New Zealand Wellington, New Zealand 11,935 Radio Portugal Lisbon, Portugal 7,140 Trans World Radio Monte Carlo Monaco 11,945 Radio Peking Peking, China 7,170 Radio Noumea Noumea, New Caledonia Programs in French 11,955 Voice of Turkey Ankara, Turkey 7,300 Radio Tirana Tirana, Albania 11,980 Radio Moscow Moscow, USSR 9,475 Radio Cairo Cairo, Egypt 15,038 Saudi Arabian Riyadh, Saudi Arabia Programs in Arabic 9,515 Voice of Greece Athens, Greece Broadcasting Service 9,525 Radio Korea Seoul, South Korea 15,084 Voice of Iran Tehran, Iran Programs in Farsi 9,530 Spanish Foreign Radio Madrid, Spain 15,135 Radio Moscow Moscow, USSR 9,535 Swiss Radio Berne, Switzerland 15,165 HCJB Qiito, Ecuador International 15,1900RU Brussels, Belgium 9,540 Radio Prague Prague, Czechoslovakia 15,205 All India Radio New Delhi, India 9,570 Radio Bucharest Bucharest, Rumania 15,260 BBC London, England 9,575 Italian Radio and Rome, Italy 15,265 Finnish Radio Helsinki, Finland Television Service 15,275 Radio Sweden Stockholm, Sweden 9,610 Radio-TV Algeria Algiers, Algeria Programs in Arabic 15,305 Swiss Radio Berne, Switzerland 9,620 Radio Berlin Berlin, East Germany International International 15,310 Radio Japan Tokyo, Japan 9,645 Radio Norway Oslo, Norway 15,320 Radio Australia Melbourne, Australia 9,720 Radio Iran Tehran, Iran Programs in Farsi 15,400 BBC London, England 9,745 HCJB Quito, Equador 15,430 Radio Mexico Mexico City, Mexico Programs in Spanish 9,770 Austrian Radio Vienna, Austria 15,465 Radio Pakistan Islamad, Pakistan Programs in Urdu 9,800 Radio Kiev Kiev, USSR 17,720 Radio France Paris, France 9,835 Radio Budapest Budapest, Hungary International 10,040 Voice of Vietnam Hanoi, Vietnam 17,825 Vatican Radio Vatican City 11,655 Israel Radio Jerusalem, Israel 17,860 Austrian Radio Vienna, Austria 11,690 Radio Kuwait Kuwait, Kuwait 21,495 Israel Radio Jerusalem, Israel 11 ,705 Radio Sweden Stockholm, Sweden 21,525 Radio Australia Melborne, Australia 11,720 Radio Moscow Moscow, USSR 21,625 Israel Radio Jerusalem, Israel 11,735 Radio Sofia Sofia, Bulgaria 21,645 Radio France Paris, France 11,745 Voice of Free China Taipei, China International 11,815 Radio Japan Tokyo, Japan 21,735 Radio-TV Morocco Rabat, Morocco Programs in Arabic 11,825 Radio Tahiti Papeete, Tahiti Programs in Tahitian 25,650 BBC London, England 11,835 4VEH Cap Haitien, Haiti 25,790 Radio RSA Johannesburg, 11 ,845 Radio Canada Montreal, Canada South Africa International

44 45 TROUBLESHOOTING

The DX-440 is a ruggedly built elec­ Weak or intermittent sound Memorized frequency cannot be recalled tronic unit with all parts conservatively • Weak radio batteries. • Wrong band is set. Switch bands. rated. However, you should treat it with • Antenna adjustment insufficient. • Memory has been erased. Re-enter care; don't subject it to excessively • Weak signal. Try moving the unit the frequency. rough handling. You will find it will give near a window when operating inside you long life enjoyment if kept free from a vehicle or in a metal frame building. SLEEP does not function excessive humidity. • Tuning slightly off-frequency. Use UP • The SLEEP button is not pressed or DOWN key to fine tune. • The power switch is set to on If you have problems-(we hope you If none of the above suggested remedies don't),-check the following: Frequency cannot be keyed in when solves the problem, return your set to direct tuning. your nearby Radio Shack store for FREQUENCY DISPLAY • EXECUTE was not pressed within 5 assistance. No/incorrect display seconds. • Weak microprocessor or radio • Microprocessor failed to initialize. batteries. Remove the microprocessorbatteries, • Microprocessor fails to initialize. This wait one minute and re-install. may happen when you first install (or Scanning or memory frequency cannot replace) batteries. Remove the micro­ processor batteries, wait for about be keyed in one minute, and re-install. • EXECUTE was not pressed after the frequency was keyed in. Display is dim • Weak microprocessor or radio Will not scan on AM batteries. • Limit frequencies are not keyed in. • Environment is inappropriate for operation; temperature is too high Scanning stops where there is no clear or too much humidity. signal ·Birdies-the internally generated RADIO signals mixed with external signals. A No sound telescopic antenna is likely to pick up • Check the VOLUME control setting. these undesirable signals; use an out­ • Headphone jack is plugged in. door antenna. • Weak radio batteries. A few of the most common birdies are: • AC adapter cord not firmly plugged. 455 kHz 3,844 kHz 9,000 kHz • DC power cord is not correctly in­ 10,245 kHz 18,000 k~z 20,490 kHz serted into cigarette lighter socket in 21,835 kHz 21,868 kHz vehicle operation. • AC jack or external DC jack is plugg­ Scanning does not stop automatically ed in when trying to operate on bat­ • Weak signal. teries. • RF GAIN is not set to MAX

46 47 CARE AND MAINTENANCE

Your DX-440 is an example of superior design and craftsmanship. Wipe the product with a dampened The following suggestions will help you cloth occasionally to keep it looking care for the DX-440 so that you new. Do not use harsh chemicals, clean­ can enjoy it for years. ing solvents, or strong detergents to clean the product. Keep the product dry. If it does get wet, wipe it dry immediately. Liquids might contain minerals that can corrode the Use only fresh batteries of the recom­ electron'lc circuits. mended size and type. Always remove old or weak batteries. They can leak chemicals that destroy electronic cir­ cuits. Use and store the product only in nor­ mal temperature environments. High temperatures can shorten the life of Modifying or tampering with the pro­ electronic devices, damage batteries, duct's internal components can cause and distort or melt plastic parts. a malfunction and might invalidate the product's warranty. If your product is not performing as it should, take it to Handle the product gently and careful­ your local Radio Shack store. Our per­ ly. Dropping it can damage circuit sonnel can assist you and arrange for boards and cases and can cause the service if needed. product to work improperly.

Keep the product away from dust and dirt, which can cause premature wear of parts.

48 49 SPECIFICATIONS

Jacks: 1. DC jack for external power (9V) Semi conductors: 1 pc. LSI 2. Headphones Jack • 3.5~ for mini stereo headphones. 7 pes. les 8 pes. FETs 44 pes. Transistors Power sources: 1. For Power when not playing radio: 59 pes. Diodes (AA size) penlight battery such as Radio Shack 23-552 7 pes. LEDs or 23-582 (not supplied) for memory/clock back-up (3V).

Circuit: 2. For Power to play radio : FM superheterodyne a. (D size) battery such as Radio Shack 23-550 or AM(LW,MW,SW) Dual conversion superheterodyne 23-580 (not supplied) x 6pcs. (9V) b. AC adaptor 9V/400mA center negative Frequency range: x~" FM: 87.5MHz - 108MHz Dimension: 11.1-" x 22." ( 292mm x 160mm x 60mm ) 2 10 25

AM: 150 kHz - 29999 kHz Weight: 1.7kg. (3.75 lbs or 60 oz) without batteries.

LW: 150kHz - 281 kHz Accessories: Shoulder strap MW: 520kHz - 1620kHz SW: divided into 12 shortwave bands 120M 2300kHz - 2500kHz 90M 3200 kHz - 3400 kHz 75M 3900 kHz - 4000 kHz 60M 4750 khz - 5060 kHz 49M 5800 kHz - 6200 kHz 41M 7100kHz- 7500kHz 31M 9500kHz - 9900kHz 25M 11650kHz - 12050kHz 19M 15100kHz - 15600kHz 16M 17550kHz - 17900kHz 13M 21450kHz - 21850kHz 11 M 25600 kHz - 26100 kHz

Antennas: LW/MW Built in ferrite bar antenna. SW Swivel telescopic antenna. External antenna terminal. FM Swivel telescopic antenna. External antenna terminal. (Not apply to W. Germany)

Output: 1200mW (10% THD)

51 50 ADDENDUM Cat. No. 20-221A

DX-440 AM/FM DIRECT ENTRY COMMUNICATIONS RECEIVER

The following specifications for sensitivity, image rejection, and selectivity are provided for your reference:

Sensitivity:

(for 20 dB Signal-to-Noise ratio):

AM 150 kHz 1260 MV/m 300 kHz 560 MV/m 600 kHz 320 MV/m 1.4 MHz 280 MV/m 3.1 MHz 4 MV 7.1 MHz 4 MV 15.1 MHz 4 MV 28.1 MHz 4 MV (for 10 dB Signal-to-Noise ratio):

SSB 150 kHz 100 MV/m 300 kHz 40 MV/m 600 kHz 25 MV/m 1.4 MHz 22 MV/m 3.1 MHz 0.4 MV 7.1 MHz 0.4 MV 15.1 MHz 0.4 MV 28.1 MHz 0.4 MV

(for 30 dB Signal-to-Noise ratio): FM 87.5 to 108 MHz 4 MV (to be continued on the back) Image Rejection Ratio:

AM/SSB 150 kHz 48 dB 300 kHz 65 dB 600 kHz 65 dB 1.4 MHz 60 dB 31 MHz 60 dB 7.1 MHz 60 dB 151 MHz 60 dB 28.1 MHz 60 dB

FM 875 to 108 MHz 40 dB

Selectivity: AM/SSB - 6dB - 50dB Wide ± 3 ± 7 kHz Narrow ± 2 ± 4 kHz IF AM/SSB/CW 1st 55.845 MHz 2nd 450 kHz FM 107 MHz

Frequency Stability:

Within 1 kHz per hour after 60 minutes warm up.

RADIO SHACK Fort Worth, Texas 76102