Ten-Tec_1254_Manual_July_2012.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 KIT Manual No. 74477 Circuit board and manual Copyright 2012. All Rights Reserved. (865) 453-7172 Fax (

2、865) 428-4483 Table of Contents Section l: GETTING STARTED A. General Introduction to Receiver Design and Features B. 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 Identificatio

3、n Information G. Building Electronic Kits: The Essentials H. Overview of Kit Assembly Phases Section ll: Kit Assembly 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 Phas

4、e 3.0 VCOs and PLL (Phase-Locked Loop) Phase 4.0 Receiver Audio, AM and Product Detectors, 455 kHz IF Amplifier, AGC 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 Detaile

5、d Table of Contents Specifications: T-KIT Model 1254 Model 1254 Operating Instructions 1 . Functions of Primary Controls 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 Batter

6、y Test Circuit Description Model 1254 Receiver Block Diagram Practical Operating Information DC Power Supply, Audio, Antennas, Special installations, SWL basics and more GLOSSARY: Terms and Abbreviations Component Reference Index Troubleshooting Guide including Chart of Significant Test Voltages Che

7、cking 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 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 Pha

8、se 1.0 schematic details Phase 1.0 circuit board illustration Fig. 1.1 : LED alignment Fig. 1.2: Installation of J1 , 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 det

9、ails Phase 3.0 circuit board illustration Fig. 3.1: VCO-1 assembly Fig. 3.2: VCO 2 assembly Phase 4.0 schematic details 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:

10、 Installation of Q4, C63, Q7 Phase 6.0 schematic details Fig. 6.1: RF Input Bandpass Filter Assembly Fig. 6.2: First 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: Function

11、s of the chassis brackets 3. Reference Section Fig. 1R: Frequency Display example Fig. 2R: Spectrum plot examples Fig. 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

12、 (after Getting Started section): Mechanical Assembly Details X-Ray View of Circuit Boards (color-coded) 16-18 4 5 7 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 thousan

13、ds of people into communications careers or the hobbies of amateur radio and shortwave listening (SWLing). The Model 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 wi

14、th precise microprocessor-controlled frequency synthesizer. Alignment is surprisingly easy and does not require complicated 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 co

15、verage: 100 kHz to 30 MHz Choice of normal or fast tuning (2.5 kHz SSB, 5 kHzAM or 100 kHz in either mode) Fifteen programmable 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 a

16、udio response with excellent SSB-CW selectivity Semiconductors: 10 IC s, 26 transistors, 16 diodes Antenna connector 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

17、 source You will build the Model 1254 in seven sections or phases, testing your work after completing each phase. We 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

18、. If you have never built an electronics kit before, please see pages 18-19. See page 14 f or tools and supplies required 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

19、 (This one, which includes the KIT PARTS information prior to any soldering.) 2.Kit Assembly (Presented in seven step-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. W

20、e do it every time we bring home a new box marked some assembly required! And most of us love to use our own Common Sense 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 assem

21、bly projects, but it is disastrous for modern electronic kit projects. You just invested serious dollars in a box containing 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 t

22、o build this kit. The main reason to build equipment such as the Model 1254 is usually the building experience itself . 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

23、successful and enjoyable! 1254 - Getting Started - 5 B. About This Manual and T-KIT We understand you may be anxious to 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 li

24、sted. But, PLEASE READ At least this very short “Getting Started” chapter Before trying ANY soldering to the circuit boards! 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 coun

25、t on you to follow it. Electronic kit-building has changed dramatically during the 50 years since TEN-TECs founder (Al 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

26、 very aware of the standards remembered by all of us who enjoyed building major kit projects in decades gone by. Be assured 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

27、projects. Todays electronic parts are much smaller and more delicate than they were a few decades ago. This fact challenges 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-throug

28、h holes should be a further motivation for close attention to directions and parts identification. while soldering is 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

29、 sturdiness of your kits metal enclosure hardware custom designed and manufactured here at TEN-TEC. 1.Read the terms of 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 pack

30、age Now for any update sheet(s) to supplement this manual. 3.The bag containing the Display Board includes ALL parts used 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 S

31、tarted 6 C. Working with the Kit Parts BEFORE beginning Assembly 4.Check and organize ALL Main Board parts per the Kit 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 al

32、ong the edge of corrugated cardboard, arranging them in an egg carton or muffin tin, or making logical piles in a small 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 sect

33、ional board drawings and schematics introducing each Assembly Phase, see the Quick Reference List of parts (with circuit 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 jus

34、t to take your time with this project. Build it for the sake of the building experience. Youll use the receiver for years, 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

35、 course is to locate these and not to lose them! ferrite beads for C63 and Q7 (2) plastic crystal base insulators for 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

36、 and sections of your receiver go together. Sizes and descriptions of smaller hardware items such as screws are specified 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

37、 contact us. 3.If “*” appears in the Schematic column for a common part value, please refer to the Component Reference 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

38、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. 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 .

39、 Rotary Encoder . 3-wire plug assembly ( for encoder ) . SPDT toggle switch . 2-wire (red) plug assembly (power switch) . 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

40、 power . . Part No. 30120 30138 28001 28082 28201 32113 38235 35277 32122 86085-02 32121 86085-01 .44035 78092D 1254 - Getting Started 8 D. T-KIT Model 1254 Receiver KIT PARTS LIST B. Main Receiver Circuit Board Parts Fixed Resistors The 3 color bands denote resistance value. The 4th band (gold) den

41、otes 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 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-b

42、rown). 220 ohm (red-red-brown). 470 ohm (yellow-violet-brown) . 1K (brown-black-red) . 1.5K (brown-green-red) . 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 (

43、red-red-yellow) . 1 megohm (brown-black-green). 10 megohm (brown-black-blue). Schematic JMP1-3, R66 R1, R45 R28, 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

44、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 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 C3

45、0 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, 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) .