Ramsey Electronics HR20, User Manual

HR20

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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: 

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Experienced Ham operators who want a simple extra receiver for keeping 
one ear on 20 meters while doing something else. 

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Beginners who would like to start by listening in on one of Ham radios most 
active bands. 

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QRP builders who want a quick, easy and reliable SA602 board kit for 20 
meter projects. 

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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.