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4-10 MHz
SHORTWAVE RADIO
Ramsey Electronics Model No.
Have you ever wanted to get into the fascinating world of radio?
The Ramsey SR-1 is a fine performer that will bring in the world
using just a few feet of wire as an antenna! Folks of all ages
have successfully built and enjoyed this easy and fun kit.
•
Enjoy hours of fascinating international listening using just a simple
indoor wire antenna
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Select any 2.5MHz portion of the 4 to 10MHz shortwave band, easily
re-tuned at any time.
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Smooth varactor diode tuning
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Excellent sensitivity and selectivity
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Front panel RF Gain, Volume, and Tuning controls
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Multi-stage audio amplifier for room filling volume
•
Well designed superhetrodyne circuit is easy to build, makes a nice
one-evening project
•
Ideal scout, school, or club project
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Clear, concise step-by-step instructions carefully guide you to a
finished kit that not only works - but you'll also learn too!
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Runs on a standard 9 volt battery
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Add our matching case and knob set for a finished 'pro' look.
Check out the excellent magazine reviews in:
√
August 1989, 73: Amateur Radio Today
√
September 1990, Popular Electronics
√
November 1991, Radio Fun
SR-1
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Table of Contents
Related Manuals for Ramsey Electronics SR-1
Summary of Contents for Ramsey Electronics SR-1
- Page 1 SR-1 Have you ever wanted to get into the fascinating world of radio? The Ramsey SR-1 is a fine performer that will bring in the world using just a few feet of wire as an antenna! Folks of all ages have successfully built and enjoyed this easy and fun kit.
- Page 2 1994 by Ramsey Electronics, Inc. 793 Canning Parkway, 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. SR-1 – 2...
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Page 3: Table Of Contents
AND INSTRUCTION MANUAL FOR 4-10MHz SHORTWAVE RADIO TABLE OF CONTENTS Introduction to the SR-1 ........4 What You Can Expect to Hear ......4 Shortwave Listening as a Hobby ......5 Circuit Description ..........6 Parts Layout Diagram .......... 7 Parts List ............. -
Page 4: Introduction To The Sr-1
Even if such a carrier is tuned to a "null," listening fidelity is less than desirable. WHAT YOU CAN EXPECT TO HEAR First, let's take a look at what is POSSIBLE to hear on your SR-1. The following are the international shortwave broadcasting bands within its tuning range: 4.750-5.060 Mhz. -
Page 5: Shortwave Listening As A Hobby
Reception of CW and SSB signals on an AM receiver requires a BFO. This is not a complicated feature, but it is beyond the purpose of the SR-1. Our companion receivers designed for the HAM bands will let you tune into these SSB and CW broadcasts. -
Page 6: Circuit Description
CB, antennas, and other topics. To learn more about Ramsey Electronics ham radio kits, write for our complete catalog. (And, be sure to tell us how you're doing with your SR-1 Receiver!) To learn more about the hobby of ham radio, write ARRL (American Radio Relay League), 225 Main Street, Newington, CT 06111. -
Page 7: Sr-1 Parts Layout Diagram
SR-1 PARTS LAYOUT DIAGRAM SR-1 – 7... -
Page 8: Parts List
1 NE602 8-pin DIP IC (U1) 1 LM358 8-pin DIP IC (U2) 1 LM386 8-pin DIP IC (U3) HARDWARE AND MISCELLANEOUS 1 SR-1 printed circuit board 3 10K potentiometers (R1,2,3) 1 DPDT PC-mount push button switch (S1) 1 RCA-type PC-mount jack (J1) -
Page 9: Assembly Instructions
PC trace from J1 through C1 to R1. 4. Install potentiometer R1, the RF gain control. 5. Now, it's time for a little "destruction"! (If you jumped ahead and installed L1 and L2, we've got bad news for you). Before these two SR-1 – 9... - Page 10 16. Before L2 may be installed, its internal capacitor must be removed by crushing it with a small screwdriver or knife blade, just as for L1. Omitting this step will prevent the oscillator from tuning the intended frequency SR-1 – 10...
- Page 11 "third" of the schematic diagram, following from the antenna to C7, you already have built a "direct conversion" shortwave receiver capable of CW-SSB reception throughout the SR-1's tuning range. If you want to prove it to yourself, connect an antenna, 9 volts DC to Jumper 1, and a high-gain test amplifier to C7.
- Page 12 26. Install C15, .01 µF (marked .01, 103 or 10nF). 27. Install C7 and C8, both 100 pF (marked 100, 101 or 100K). 28. All four transistors used in the SR-1 are identical NPN type 2N3904 or similar. Transistors are installed just like any other part - don't be afraid to use enough heat to make good, clean connections.
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Page 13: Shortwave Antenna Ideas
• hot-melt glue SHORTWAVE ANTENNA IDEAS The type of antenna you'll want to use for your SR-1 depends on the degree of interest you have in shortwave listening, on whether you are limited to an indoor or balcony antenna, and on whether you think you may soon want to obtain a ham radio license. - Page 14 AA-7 may be used with any receiver or even a VHF scanner. It's easy to build and a nice companion for your SR-1. If you need more construction details on antennas, check the book mentioned on page 6, or any introductory ham radio book, or the Radio Shack book on Antennas (No.
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Page 15: Initial Testing And Adjustment
If you are without any kind of testing or frequency reference equipment whatsoever, the easiest way to start enjoying your SR-1 is, with the Tune control set at its midpoint, to slowly tune L2 with your alignment tool as though it were a tuning dial. - Page 16 Following are results of tests on an SR-1 to give you a general guideline on what to expect if you want to pre-set adjustments of oscillator coil L2. Each turn of L2 is one full turn clockwise.
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Page 17: Troubleshooting Tips
"classic crystal radio". A grounded metal case for the SR-1 is one possible solution. Another fix is to solder a .001 µF capacitor in parallel with R10, so that it bypasses the anode of D2 to ground. - Page 18 THE RAMSEY ELECTRONICS CASE, KNOB & HARDWARE OPTION Your finished receiver can be installed in a variety of enclosures of your own design and choosing. You might be planning to combine several Ramsey circuit kit boards in a single enclosure. Use of the inexpensive and attractive Ramsey case and knob kit will give your unit that finished look and increase its resale value.
- Page 19 If you use your own enclosure and knobs, you will probably plan some sort of dial markings. If you finish your receiver with the Ramsey custom case and knob kit, you may wish to copy one of the following designs to make a logging scale: SR-1 – 19...
- Page 20 Notes: SR-1 – 20...
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Page 21: Ramsey Kit Warranty
'1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied... - Page 22 SR-1 Shortwave Receiver Quick Reference Page Guide Introduction to the SR-1 ...... 4 What You Can Expect to Hear .... 4 Shortwave Listening as a Hobby ..5 Circuit Description ....... 6 Parts Layout Diagram ......7 Parts List ..........8 Assembly Instructions ......