Ramsey Electronics HR20 manual Introduction, Ramsey HR-SERIES Amateur Receivers

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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.

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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 ReceiversUsing Your Receiver Tuning SSB SignalsCW Operation 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 Other Methods of Dial Calibration Frequency StabilityDirect Frequency Readout LM386 Audio Output HR20 Construction Notes Ramsey Kit Warranty Factory Repair of Assembled Kits Total Solder Points Estimated Assembly Time HR20 Amateur Receiver KITRequired Tools Additional Suggested Items
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