valutazioni - 5, GPA: 3.6
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Cases match all Ramsey products. PARTIAL LIST OF AVAILABLE KITS RAMSEY TRANSMITTER KITS • ..FM10A, FM25B Stereo Transmitters • AM1, AM25 AM Transmitters • TV6 Television Transmitter • FM100B Professional FM Stereo Transmitter RAMSEY RECEIVER KITS • FR1 FM Broadcast Receiver • AR1 Aircraft Band Receiver • SR2 Shortwave Receiver • AA7 Active Antenna • SC1 Shortwave Converter RAMSEY HOBBY KITS • SG7 Personal Speed Radar • SS70A Speech Scrambler • MX5, MX-10 Mixers • MD3 Microwave Motion Detector • TFM3 Tri-Field Meter • STC1 Stereo Transmitter Companion RAMSEY AMATEUR RADIO KITS • HR Series HF All Mode Receivers • QRP Series HF CW Transmitters • DDF1 Doppler Direction Finder • CPO3 Code Practice Oscillator • QRP Power Amplifiers RAMSEY MINI-KITS Many other kits are available for hobby, school, scouts and just plain FUN. New kits are always under development. Write or call for our free Ramsey catalog. HR20 AMATEUR RECEIVER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MHR20 Revision C1 First printing: January 1995 COPYRIGHT 1994 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America. HR20• 2 Ramsey Publication No. MHR20 Price $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR HR20 AMATEUR RECEIVER KIT TABLE OF CONTENTS Introduction to the HR20.................4 About Direct Conversion .................5 Circuit description ...........................6 Parts list ..........................................7 Schematic diagram .........................9 Parts layout...................................10 Assembly instructions ...................11 Initial testing ..................................14 Alignment ......................................15 Using your HR20 ..........................16 Troubleshooting guide ..................19 Notes for experienced users.........20 Warranty .......................................26 HR20• 3 INTRODUCTION: If you like plenty of action and DX (long distance) communications, the 20 meter Ham band is the place to be. Almost 24 hours a day there’s something interesting happening on 20 meters. There are several groups of people who will enjoy this Ramsey HR20 Receiver: • Experienced Ham operators who want a simple extra receiver for keeping one ear on 20 meters while doing something else. • Beginners who would like to start by listening in on one of Ham radios most active bands. • QRP builders who want a quick, easy and reliable SA602 board kit for 20 meter projects. • QRP builders not interested in our warranty or following our step-by-step assembly and use directions, but who want to get their hands on our most versatile receiver PC-board and parts kit for their own projects. The Ramsey HR20 has something fun and easy for each of them. Note To Beginners: Building the HR20 is really no harder than any of our other receivers in this series. Just follow the directions carefully. All you need to know to successfully complete this receiver is contained in this detailed manual. Enjoy your HR20 receiver. RAMSEY HR-SERIES AMATEUR RECEIVERS: All Ramsey Direct Conversion receiver Kits share the same basic PC-boards and most components which are not frequency critical. However, there are enough differences among the band characteristics, desirable operating features for each band, and differences among the people who would most typically choose a particular band, that a separate instruction manual is published for each receiver. Other circuit details which vary from band to band include the tuning range provided by the varactor circuit. “Bandspread” for favorite band segments is easy on 160 or 80 meters but requires other considerations on higher frequencies. Also, some bands appeal to QRP operators more than others, and some are better suited for portable and travel use. Therefore, we are pleased to assure you that your manual for the HR20 receiver and the receiver circuit itself have been designed with an understanding of typical operating needs and expectations for the 20 meter band. HR20• 4 This receiver circuit is ideal for discovering just how simple a true “Communications Receiver” can be . That’s right- there is a BIG difference between the Ramsey HR20 and other simple short wave radio circuits we can try to build. Yet it is very easy to build. Our HR-series are by far the easiest to build of all the Ramsey kit receivers and therefore very nice for radio newcomers. Consequently, our manuals for the 40 and 80 meter receivers are written with beginners in mind, since both of these bands offer Novice and Technician privileges. The manuals for the 30 and 20 meter versions assume the general Ham radio know-how that should accompany a General Class or higher license. ABOUT DIRECT CONVERSION RECEIVERS: The HR20 is a “Direct Conversion” receiving circuit. There is no need for IF (inter...