Ramsey Electronics HR20 manual Partial List of Available Kits Ramsey Transmitter Kits

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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

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Contents ALL Mode Receiver KIT Partial List of Available Kits Ramsey Transmitter Kits HR20 Amateur Receiver KIT Introduction Ramsey HR-SERIES Amateur ReceiversAbout Direct Conversion Receivers Circuit Description Capacitors Parts Supplied with the HR20 KITLEARN-AS-YOU-BUILD Receiver Assembly Strategy HR20 HR20 Parts Layout Diagram Receiver Assembly HR20 HR20 Initial Testing of Your HR20 Required for Initial Testing and AlignmentAlignment Alignment Hint for ALL Direct Conversion ReceiversCW Operation Using Your ReceiverTuning SSB Signals On the AIR TRANS-RECEIVINGSpeaker Operation More Audio Power Another WAY Adding AN LED Power on IndicatorTroubleshooting Tips Alternate Power Sources General Notes for Experienced QRP BuildersBandspread and Tuning Range Direct Frequency Readout Frequency StabilityOther Methods of Dial Calibration LM386 Audio Output HR20 Construction Notes Ramsey Kit Warranty Factory Repair of Assembled Kits Required Tools Total Solder Points Estimated Assembly TimeHR20 Amateur Receiver KIT Additional Suggested Items