Ten-Tec_1254_Manual.pdf

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1、KIT by TEN-TEC INSTRUCTION MANUAL Americas Best! SSB-CW-AM RECEIVER Microprocessor-controlled, 15 Memories, dual conversion, tunes 100 kHz to 30 MHz No. 1254 CoMplEtE KIt WIth CASE, hARdWARE 74477 Table of Contents Section l: GETTING STARTED A. General Introduction to Receiver Design and Features B.

2、 About this Manual and T-KIT C. Working with the Kit Parts Before Assembly D. Detailed Kit Parts List E. Checklist of supplies and tools needed for assembly F. Component Identification Information G. Building Electronic Kits: The Essentials H. Overview of Kit Assembly Phases Section ll: Kit Assembly

3、 and Alignment Detailed Table of Contents Installing Parts on the Boards Phase 1.0 Display Board Assembly Notes on Main Board Assembly Phase 2.0 Logic Section and Display Drivers Phase 3.0 VCOs and PLL (Phase-Locked Loop) Phase 4.0 Receiver Audio, AM and Product Detectors, 455 kHz IF Amplifier, AGC

4、system Phase 5.0 2nd Mixer, 2nd LO, Clarifier control Phase 6.0 RF Input, 1st Mixer, 1st LO amplifier Phase 7.0 Final Assembly and Alignment Section III: Reference Information Detailed Table of Contents Specifications: T-KIT Model 1254 Model 1254 Operating Instructions 1 . Functions of Primary Contr

5、ols 2. Storing Frequencies in Memory 3. Recalling or Tuning Memory Frequencies 4. Tuning AM signals 5. Tuning SSB signals 6. Tuning CW signals 7. Microprocessor RESET 8. Memory Battery Test Circuit Description Model 1254 Receiver Block Diagram Practical Operating Information DC Power Supply, Audio,

6、Antennas, Special installations, SWL basics and more GLOSSARY: Terms and Abbreviations Component Reference Index Troubleshooting Guide including Chart of Significant Test Voltages Checking for Solder Bridges 1254 - Getting Started 2 4 5 6 8-13 14 15-17 18-19 20 1 2 3-10 11-12 14-24 26-35 36-46 48-55

7、 56-63 64-72 1 2 3-5 6-14 8 15-23 24-28 25-35 36-39 40 Table of Illustrations, Charts and Diagrams 1 . Getting Started Section Selected Component Illustrations 2. Assembly Section Phase 1.0 schematic details Phase 1.0 circuit board illustration Fig. 1.1 : LED alignment Fig. 1.2: Installation of J1 ,

8、 J2 Fig. 1.3: Encoder wiring Phase 2.0 schematic details Phase 2.0 circuit board illustration Fig. 2.1: Installation of P1, P2 Fig. 2.2: DC Power Input section Phase 3.0 schematic details Phase 3.0 circuit board illustration Fig. 3.1: VCO-1 assembly Fig. 3.2: VCO 2 assembly Phase 4.0 schematic detai

9、ls Phase 4.0 circuit board illustration Fig. 4.1 : Headphone jack wiring Phase 5.0 schematic details Phase 5.0 circuit board illustration Fig. 5.1: balun transformer details Fig. 5.2: Installation of Q4, C63, Q7 Phase 6.0 schematic details Fig. 6.1: RF Input Bandpass Filter Assembly Fig. 6.2: First

10、Mixer Assembly Fig. 6.2b: Alignment Preview Phase 6.0 Full circuit board illustration Fig.7.1: Chassis and panel assembly overview Table 7.1: Small hardware preview Fig. 7.2: Functions of the chassis brackets 3. Reference Section Fig. 1R: Frequency Display example Fig. 2R: Spectrum plot examples Fig

11、. 3R: Block Diagram of Circuit Stages Fig. 4R: PLL Block Diagram Fig. 5R: A simple outdoor SWL antenna Fig. 6R: DC power connector polarity Fig 7R: Headphone jack wiring Foldout Pages (after Getting Started section): Mechanical Assembly Details X-Ray View of Circuit Boards (color-coded) 16-18 4 5 7

12、8 9 14 15 17 20 26 27 30 31 36 37 41 48 49 51 53 56 58 60 61 62 62 66 67 4 7 8 9 16 19 21 1254 - Getting Started 3 Building ones own receiver from a kit has launched countless thousands of people into communications careers or the hobbies of amateur radio and shortwave listening (SWLing). The Model

13、1254 combines the satisfaction of the kit-building experience with the performance features expected in a modern shortwave receiver. You will build a true dual- conversion superhet with precise microprocessor-controlled frequency synthesizer. Alignment is surprisingly easy and does not require compl

14、icated test equipment. Building this receiver yourself also gives you the assurance that you can maintain it in perfect working order for years to come. General Features: Frequency coverage: 100 kHz to 30 MHz Choice of normal or fast tuning (2.5 kHz SSB, 5 kHzAM or 100 kHz in either mode) Fifteen pr

15、ogrammable memories Convenient default or empty memory: 15 MHz (WWV) Synthesized 45-75 MHz local oscillator 45 MHz first IF 455 kHz second IF 4 kHz filter bandwidth combines good AM audio response with excellent SSB-CW selectivity Semiconductors: 10 IC s, 26 transistors, 16 diodes Antenna connector

16、can supply DC voltage for active antenna 1.5W audio output, built-in speaker, headphone jack Includes a wall-type 15VDC power supply but will operates from any 1 2-16 VDC 500 mA power source You will build the Model 1254 in seven sections or phases, testing your work after completing each phase. We

17、encourage you to study this entire manual before beginning construction. A detailed circuit description and block diagrams are provided in the Reference Section, Part 3 of this manual. If you have never built an electronics kit before, please see pages 18-19. See page 14 for tools and supplies requi

18、red to build the kit and use the receiver. 1254 - Getting Started 4 A. Introduction to Model 1254 Receiver Features and Design This T-KIT Manual has THREE sections: 1.Getting Started (This one, which includes the KIT PARTS information prior to any soldering.) 2.Kit Assembly (Presented in seven step-

19、by-step illustrated Phases.) 3.Reference Information (Such as operating instructions, circuit description, troubleshooting guide and much more.) ALL of us build kits of many kinds. We do it every time we bring home a new box marked some assembly required! And most of us love to use our own Common Se

20、nse first to see how quickly we can put together that new bike, computer desk or some gadget before we ever look at the instruction sheets! This approach is fine for mechanical assembly projects, but it is disastrous for modern electronic kit projects. You just invested serious dollars in a box cont

21、aining electronic and sheet metal parts plus this book. The same money could have gotten you a comparable receiver, maybe pre-owned, very nice and ready to use. But you still chose to build this kit. The main reason to build equipment such as the Model 1254 is usually the building experience itself

22、. Plus some new electronics know-how and understanding which can come with such experience. The purposes of this manual are to help you have a kit- building experience which is both successful and enjoyable! 1254 - Getting Started - 5 B. About This Manual and T-KIT We understand you may be anxious t

23、o get going! When you are ready to do something instead of read, Go straight to the KIT PARTS LIST, Starting on Page 8. Use the check boxes To make SURE you have every single part listed. But, PLEASE READ At least this very short “Getting Started” chapter Before trying ANY soldering to the circuit b

24、oards! This book is the key to your success with the Model 1254 Receiver Kit project you are starting. Its a TWO-WAY DEAL. You count on the information in this manual And we now count on you to follow it. Electronic kit-building has changed dramatically during the 50 years since TEN-TECs founder (Al

25、 Kahn, K4FW) gave a boxcar loaded with war surplus parts to some friends who started a company which became known as Heathkit, so, the several generations of the hams at TEN- TEC are very aware of the standards remembered by all of us who enjoyed building major kit projects in decades gone by. Be as

26、sured that we refer to a large library of the most respected manuals of yesteryear as well as T-KIT customer comments in continuing to provide you with todays best in electronic kit projects. Todays electronic parts are much smaller and more delicate than they were a few decades ago. This fact chall

27、enges todays kit-builders to become much more careful than in the past when identifying and installing circuit board components. Those nice double-sided boards with the plated-through holes should be a further motivation for close attention to directions and parts identification. while soldering is

28、fairly easy, the desoldering process is extremely tedious, often requiring the purchase of replacement parts. On the other hand, we know you will appreciate the classic precision and sturdiness of your kits metal enclosure hardware custom designed and manufactured here at TEN-TEC. 1.Read the terms o

29、f the T-Kit Limited warranty Now! It explains both our responsibilities and yours. 2.The success of your project depends on your willingness to study this manual. Check your kit package Now for any update sheet(s) to supplement this manual. 3.The bag containing the Display Board includes ALL parts u

30、sed for the Display Board, Assembly phase 1.0. After checking the contents of the Display Board bag, keep those parts together and separate from all other kit parts. 1254 - Getting Started 6 C. Working with the Kit Parts BEFORE beginning Assembly 4.Check and organize ALL Main Board parts per the Kit

31、 parts List before you start soldering. Electronics hobbyists have many different ways of sorting and organizing small parts: standing them on a block of styrofoam or in the holes along the edge of corrugated cardboard, arranging them in an egg carton or muffin tin, or making logical piles in a smal

32、l tray. 5.This kit manual offers you the further opportunity to PRE- ORGANIZE the parts exactly needed for each of the five Main Board Assembly Phases 2.0 through 6.0. After the sectional board drawings and schematics introducing each Assembly Phase, see the Quick Reference List of parts (with circu

33、it functions) used for that phase. 6.If you believe any parts are missing from your kit package, the warranty explains how to contact us for replacement parts. 7.We encourage you just to take your time with this project. Build it for the sake of the building experience. Youll use the receiver for ye

34、ars, but youll only build it once. It really is worth your time to learn about it as you build it! 1254 - Getting Started - 7 There are a few VERY Small Parts . . . The main goal, of course is to locate these and not to lose them! ferrite beads for C63 and Q7 (2) plastic crystal base insulators for

35、Y1, Y3 (2) setscrew for main Tuning Knob HARDWARE ITEMS Please refer as needed to the Model 1254 Mechanical Details foldout page at the end of this section to see how all major parts and sections of your receiver go together. Sizes and descriptions of smaller hardware items such as screws are specif

36、ied clearly in instruction steps. 1.Check and organize all parts before starting construction. 2.See T-KIT Warranty if you believe any parts are missing. The Warranty explains how to contact us. 3.If “*” appears in the Schematic column for a common part value, please refer to the Component Reference

37、 Index (in Reference section) to see all uses of that value. A. Model 1254 Front Display Board Kit (These are packed together in one bag. Keep them together, separate from the other kit parts.) Quantity 8 1 4 3 6 4 4 2 1 1 1 1 1 1 Description and Value Resistor: 33 ohm (orange-orange-black) 1/4watt.

38、 Resistor: 1K (brown-black-red) 1/8 watt. 1N4148 silicon diode . Green LED . LED Display . Mini pushbutton switches, momentary . Switch button keycap . 8 position pin header socket . Rotary Encoder . 3-wire plug assembly ( for encoder ) . SPDT toggle switch . 2-wire (red) plug assembly (power switch

39、) . Insulating sleeve (for power switch, phone jack) 5”Piece Display circuit board, 2-sided, plated-through holes . Schematic R1-R8 R9 D1-D4 D5-D7 U1-U6 SW1-4 for SW1-4 J1, J2 EN1 DC power . . Part No. 30120 30138 28001 28082 28201 32113 38235 35277 32122 86085-02 32121 86085-01 .44035 78092D 1254 -

40、 Getting Started 8 D. T-KIT Model 1254 Receiver KIT PARTS LIST D5-D62 B. Main Receiver Circuit Board Parts Fixed Resistors The 3 color bands denote resistance value. The 4th band (gold) denotes 5% tolerance. All resistors are l/4-watt unless specified otherwise. Quantity 4 2 3 12 2 6 5 5 2 4 5 18 1

41、5 12 1 1 1 1 Description and Value “zero ohm” jumper (single black band) . 4.7 ohm (yellow-violet-gold) . 47 ohm (yellow-violet-black) . 100 ohm (brown-black-brown) . 150 ohm (brown-green-brown). 220 ohm (red-red-brown). 470 ohm (yellow-violet-brown) . 1K (brown-black-red) . 1.5K (brown-green-red) .

42、 2.2K (red-red-red). 4.7K (yellow-violet-orange) . 10K (brown-black-orange). 15K (brown-green-orange) . 22K (red-red-orange). 47K (yellow-violet-orange) . 150K (brown-green-yellow) . 220K (red-red-yellow) . 1 megohm (brown-black-green). 10 megohm (brown-black-blue). Schematic JMP1-3, R66 R1, R45 R28

43、, 34, 40 * R20, R21 * * * R16, R17 R47, 61, 85, 87 * * R15 * * R44 R49 R48 R2 Part No. 30353 30111 30122 30126 30128 30130 30134 30138 30140 30142 30146 30150 30076 30154 30157 30163 30077 30173 30185 Disc Ceramic Capacitors Quantity 1 1 1 1 3 1 1 2 1 4 1 4 1 2 2 1 4 Description and Value 1 pF 2 pF

44、3 pF 8 pF 10 pF 15 pF 18 pF 20 pF 27 pF 33 pF (wider lead spacing) 33 pF (narrow lead spacing) 47 pF 56 pF 75 pF 100 pF (marked 101) 150 pF (marked 151) 180 pF (marked 181) Schematic C55 C30 C23 C57 C24, 27, 28 C52 C31 C94, C95 C19 C21, 22, 77, 78 C5 C54, 56, 70, 73 C83 C39, C84 C91, C92 C37 C37, 40

45、, 71 72 Part No. 23247 23301 23248 23250 23251 23253 23302 23254 23375 23376 23246 23378 23379 23382 23385 23388 23389 1254 - Getting Started 9 Disc capacitors cont. Quantity 1 14 8 26 Description and Value 220 pF (marked 221) . .001 F (marked 102) . .01 F (marked 103) . 0.1 F (marked 104) . Schematic C36 * * * Part No. 23396 23245 23260 23261 Film Capa