Table of Contents
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MFJ-8100
World Band Receiver
MFJ-8100 World Band Receiver
Table of Contents
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Page 9
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Your Receiver Audio Circuit
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Page 12
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Notes for Radio Hams & Experimenters
Page 13
Conclusion
14
Some Helpful Terms & Abbreviations
15
Sample SWL Log Page
18
Schematic Diagram of MFJ-8100 Receiver
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Table of Contents
Related Manuals for MFJ MFJ-8100
Summary of Contents for MFJ MFJ-8100
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Page 1: Table Of Contents
In Case of Difficulty Page 12 Notes for Radio Hams & Experimenters Page 13 Conclusion Page Some Helpful Terms & Abbreviations Page Sample SWL Log Page Page 17 MFJ-8100 Parts List Page PC-Board View Page 19 Schematic Diagram of MFJ-8100 Receiver Page 20... - Page 2 MFJ-8100 World Band Receiver Instruction Manual written by Dan F. Onley, K4ZRA Copyright 1993 Enterprises, Inc. Rights Reserved.
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Page 3: For Beginners
MFJ-8100 World Band Receiver For Beginners You're about enjoy versatile shortwave receiver which employs a circuit concept that is as classic as the 1920's but which uses modern engineering that takes advantage of the advanced capabilities of today's electronic components. -
Page 4: Back To Today And The Future
AND UNDERSTANDING a simple radio set which could receive signals from anywhere in the world. Back to Today and the Future! Your MFJ 8100 is a much better receiver than the "classic'' radio sets which attracted several generations of Americans to the excitement of radio and electronics. -
Page 5: For Experienced Hams, Enthusiasts And Engineers
MFJ-8100 World Band Receiver To put it very simply, a detector converts radio energy from an antenna into audio energy, i.e., a sound which you can hear. A detector can be as simple as a crystal diode, which is the heart of the simple "crystal radio.''... - Page 6 MFJ-8100 World Band Receiver Why use a REGENERATIVE circuit for a kit new for the 1990's? fair question, MFJ-8100 like regenerative HF receiver you've ever used before! GOAL determined design circuitry this receiver. We wanted the following features: GOOD reception of BOTH shortwave AM and CW-SSB...
- Page 7 MFJ-8100 World Band Receiver with an RF gain pot that has little effect on frequency or regeneration. Manageable, "tame'' regeneration control circuit. Regeneration begins smoothly with comfortable adjustment range. The result, we think, is a receiver design which bridges the classic simplicity of regeneration to the performance demands of the 1990's.
- Page 8 MFJ-8100 World Band Receiver To prolong useful battery life, R13 limits current draw by the LED (CR1) to minimum reasonable visibility as an on-off indicator.
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Page 9: Receiver Controls And Connections
MFJ-8100 World Band Receiver RECEIVER CONTROLS AND CONNECTIONS Most of the controls are self explanatory. However, it is very important understand correct Regeneration Control and the two internal trimmer adjustments of the receiver. BANDSWITCH (SW1) This quality rotary switch selects any one of the 5 tuning ranges from A to E indicated on the tuning scale. -
Page 10: Understanding And Using The Regeneration Control
MFJ-8100 World Band Receiver REGENERATION RANGE TRIMMER (R20) Ordinarily, this trimmer adjusted only after construction or in the unlikely event that any of the FET transistors replaced. This adjustment assures smooth regeneration over five tuning ranges. Construction Phase 5. DIAL CALIBRATION TRIMMER (C5) -
Page 11: Tuning Ssb Voice Signals
MFJ-8100 World Band Receiver With control turned fully left (counter clockwise), receiver virtually silent. "Regeneration'' begins at a certain point as you turn the control clockwise. The exact point varies not only from band band even tune within given band. - Page 12 MFJ-8100 World Band Receiver On modern ham radio transceivers, tuning SSB is made so easy by means of internal filters that many licensed ham operators are not aware of the basic technique for tuning in SSB signals on receivers without such filters.
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Page 13: Using And Enjoying Your Receiver
MFJ-8100 World Band Receiver USING & ENJOYING YOUR RECEIVER To get maximum satisfaction from your new shortwave receiver, we encourage you to develop good familiarity with these sections of this manual: __ Antenna Considerations __ Regeneration Control __ Band Switch and Tuning Ranges... -
Page 14: Setting Up A Useful Shortwave Antenna
MFJ-8100 World Band Receiver SETTING UP A USEFUL SHORTWAVE ANTENNA reason provided "universal binding post'' antenna connector (plus separate ground connector) is to make it as easy and economical for you as possible to try out different antenna setups. By "universal,'' we mean that you can insert a "banana''-style plug OR make various styles of... -
Page 15: About The 5 Tuning Ranges Of Your Receiver
MFJ-8100 World Band Receiver The amplifier circuit provides sufficient output for moderate speaker volume. Miniature speaker systems designed "Walkman'' and similar personal stereo devices will plug right into J2 or J3 and work very well. However, please remember that the amplifier is specifically designed for headphone operation. - Page 16 MFJ-8100 World Band Receiver The purpose of the following information is to give newcomers a general idea of what to expect to hear in each of the 5 frequency ranges tuned by your receiver. First, please understand that the frequency markings on the tuning dial can be only approximate.
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Page 17: Shortwave Listening In General
MFJ-8100 World Band Receiver 30 meter ham band (CW and RTTY only in the USA) is at 10.1 to 10.15 MHz. This tuning range is generally busy 24 hours a day. Range D: 13.2 to 16.4 MHz. On the 20 Meter ham band (14.0 to 14.35 MHz), you can hear... - Page 18 The MFJ-8100 just might be the very best regenerative receiver ever designed, but it is not intended to be all things to all people. The MFJ-8100's PC-board is a very roomy "platform'' which may SEEM to invite countless modifications. However, please...
- Page 19 220 pF without ALSO increasing total inductance are pointless if you're looking for good 160 Meter performance.] While it's not intended as a communications receiver, the very fact that the MFJ-8100 covers all or part of so many different popular bands...
- Page 20 The Wonderful World of Ham Radio, by Richard Skolnik, KB4LCS (1990, MFJ Edition No. 35) Or, if you'd like just one copy of one magazine that's all about ALL the signals you may hear on your MFJ-8100, you can find latest...
- Page 21 MFJ-8100 World Band Receiver Throughout this instruction manual, we use plain English as much as possible. But there's no way around using common electronics terms and abbreviations where appropriate. simply try to avoid "jargon'' that is unnecessary. following mini-glossary was compiled as a help to beginners work with this unit.
- Page 22 MFJ-8100 World Band Receiver Electrolytic (capacitor) - a capacitor containing an acid salt paste (electrolyte) generally polarized with positive negative side. Correct polarity MUST be observed when installing electrolytic capacitors. FET - "Field Effect Transistor'' Ground - Refers to all points and surfaces in an electronic device which are connected to the -DC side of the power supply or battery.
- Page 23 MFJ-8100 World Band Receiver hear in an AM broadcast if the Regeneration control is turned too far to the right. Tolerance - the manufacturing accuracy for electronic (and other) parts. Tolerance ranges from 20% down to better than 1% of the value marked on the part.
- Page 24 MFJ-8100 World Band Receiver...
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Page 25: Mfj-8100 Parts List Page
MFJ-8100 World Band Receiver MFJ-8100 Parts List Component Number Value/Description MFJ Part Air-variable, 204-5050 tuning C2,C4, C10, C11, .1 uF. 200-2017 47 pF. 205-0021 5-30 pF. trimmer 204-0013 33 pF. 200-2016 C7, C8, C21, C28 .01ufd. 200-2015 C9, C17 .0033 polystyrene... -
Page 26: Pc-Board View
MFJ-8100 World Band Receiver 100K trimmer, 130-5100 Antenna connector 06-0003 J2, J2 Stereo 1/8'' jack 601-4010 5-position switch 500-0024 push switch 504-0022 Note: C 20, C 22-27, R10, R14-16, R 18 are not used. PC-Board View... - Page 27 MFJ-8100 World Band Receiver Schematic Diagram...
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