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Страница 2: ...UCTION 19 28 Construction Phase 1 steps 1 1 through 1 10 19 Construction Phase 2 steps 2 1 through 2 20 20 Construction Phase 3 steps 3 1 through 3 20 22 Construction Phase 4 steps 4 1 through 4 14 23...
Страница 3: ...ent that you may return the entire kit UNASSEMBLED for credit or refund If you have never built an electronics kit before PLEASE study this book carefully before unpacking the small parts Once you hav...
Страница 4: ...or over a decade these magical whistling squawking glowing boxes were the norm for home listening as well as for the first generation of radio hams Receiver design evolved swiftly The superheterodyne...
Страница 5: ...e ready please explore the technical explanation of your receiver in Introduction No 2 In the meantime you can peek at the schematic diagram and picture the receiver in three basic sections A Detector...
Страница 6: ...w level audio signal which is boosted to comfortable listening level by the LM386 integrated circuit amplifier The RF amplifier serves two purposes It boosts the RF signals from the antenna to the det...
Страница 7: ...ls of simplicity and economy To meet our goals we chose to refine the regenerative concept as much as possible using contemporary design concepts and component characteristics Our first goal was to ta...
Страница 8: ...combination of simple inductors For example the total inductance for Band A is L1 L2 L3 L4 L5 The inductance for Band E is only L5 And so forth Air variable C1 uses its 50 pF range and mechanical vern...
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Страница 10: ...er s performance we ve provided a separate section on its use In brief it controls receiver sensitivity and adjusts between AM broadcasts and CW SSB VOLUME R2 This potentiometer performs the normal fu...
Страница 11: ...st NOT be pushed all the way in or it will short out the audio ANTENNA CONNECTOR J1 This binding post permits easy hookup of any wire or a banana plug may be inserted in its end 10 to 20 feet of ordin...
Страница 12: ...gins to squeal oscillate Always use the LEAST amount of regeneration necessary for good reception of a given signal As a rule the best reception of AM shortwave broadcast signals occurs just BEFORE fu...
Страница 13: ...which permits easier tuning These are all LSB lower sideband signals Think to yourself for LOWER sideband tune DOWN for UPPER sideband tune UP In practice this means that you would approach the LSB si...
Страница 14: ...ective solder connection resulting form using too little heat The joint looks like a ball and is not shiny CW Continuous Wave refers to Morse Code signals DC direct current example battery voltage in...
Страница 15: ...ed carefully through the use of a regeneration control RF Radio Frequency Energy in contrast to audio or DC RTTY Radio Teletype SSB Single Sideband a method of voice transmission which eliminates the...
Страница 16: ...R6 R9 1 2 2K ohm red red red R13 4 10K ohm brown black orange R3 R4 R5 R8 1 1M ohm brown black green R7 INDUCTORS 1 10 H molded brown black black silver L1 1 3 3 H molded orange orange gold silver L2...
Страница 17: ...nd SW1 3 3 8 steel washers for controls and SW1 2 Instrument knobs for controls 1 Pointer knob for band switch 1 Larger 1 25 knob for tuning 1 Pointer assembly for tuning capacitor 8 Pan head phillips...
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Страница 19: ...n with other parts If you watch out for just these 5 pitfalls you will build your receiver right the first time and start enjoying its worldwide receiving capabilities right away Your receiver kit is...
Страница 20: ...which they resemble Correct selection and installation of the inductors is essential to correct tuning of your receiver If you mix them up what you hear will not correspond to the tuning dial If you...
Страница 21: ...ted and we ve made sure that this receiver will tune correctly Construction Phase 2 Steps 2 1 through 2 20 The parts in Phase 2 are the heart of your receiver working together with the tuning circuit...
Страница 22: ...2 9 Install transistor Q2 per 2 8a above 2 10 Install transistor Q3 per 2 8a above 2 11 Install R7 1M ohm brown black green 2 12 Install C17 0033 F body marking 332K 2 13 Install C8 01 F marked 103M...
Страница 23: ...arefully Be sure not to let the solder tip touch two pins at the same time which would cause unwanted solder bridges 3 2a In step 2 3 above you installed the first of the 5 electrolytic capacitors use...
Страница 24: ...f the bulb The anode side is nearest the 5 position bandswitch SW1 3 19b Install LED CR1 per 3 19a and the following Insert the LED with anode side toward SW1 Slide it into holes as far as it will go...
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Страница 26: ...ring points Touch up any questionable solder point by reheating the connection with a very clean soldering iron tip 4 14 Use the double sided adhesive strip to secure the 9 volt battery bracket in the...
Страница 27: ...ead to Step 5 10 regarding adjustment of trimmer R20 In order to do that adjustment you first need to experience exactly what regeneration sounds like which we ll do in 5 8 5 8 With the controls set p...
Страница 28: ...For now keep the screw tips flush with the top of the spacers 6 3 Attach the four self adhesive bumper feet to the bottom of the cabinet in a symmetrical pattern 6 4 Slip the PC board into the cabinet...
Страница 29: ...pointer stripes of the knobs before tightening 6 13 Recheck the LED for best positioning through the front panel 6 14 Attach the rear antenna binding post The split washer goes against the inside of...
Страница 30: ...u have determined whether adjusting C5 moved WWV closer to or further away from the desired point on the dial Repeat adjustment of C5 and the Main Tuning until the dial pointer is on the correct frequ...
Страница 31: ...ntrol is learned through experience It controls the sensitivity of the receiver and distinguishes between AM broadcasts and CW SSB 3 The tuning ranges are set up so that you can expect to find somethi...
Страница 32: ...g or pipe as well as wire The wire can be bare or insulated It could be something not intended to be an antenna such as a gutter fence flagpole or metal roof In fact radio hams and serious SWL s have...
Страница 33: ...utility or communications speaker AUTHOR S NOTE I have fully tested this use of a second identical LM386 IC circuit with speaker and can recommend it highly to all who can t confine all this listenin...
Страница 34: ...4 35 MHz you can hear strong CW and SSB voice signals from around the world throughout the day and well into the evening This is the most active and crowded of the international ham radio bands You al...
Страница 35: ...iew all construction steps carefully Let somebody else go over your work and the steps Following are minor problems which are easy to solve One band seems identical to an adjacent band Check the solde...
Страница 36: ...ur exact difficulty as clearly as possible You will be best helped if you have your unit manual and all information on your station handy so you can answer any questions the technicians may ask You ca...
Страница 37: ...hanging C3 or any inductance affects the tuning range of ALL the bands Author s Hint To save you time as well as wear and tear on the PC board here s what my own curiosity showed reducing C3 can easil...
Страница 38: ...er acquainted with radio communications and electronics as a hobby as a possible profession or both Among the hundreds of publications available we are pleased to recommend the following as especially...
Страница 39: ...2 16 200 2015 CR1 LED 3 19 320 0001 IC1 LM386 audio amp 3 1 3 20 311 0386 L1 10 uH 1 2 401 0102 L2 3 3 uH 1 3 401 0045 L3 1 uH 1 4 401 0037 L4 47 uH 1 5 401 0015 L5 T 52 2 toroid 8T 4 10 403 1003 Q1...
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