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CONVERTER KIT
Ramsey Electronics Model No.
Fascinating listening for all ages and abilities - tunes the
world from any standard AM broadcast receiver. Put
some 'spark' into that commute to work or that long trip,
listen to shortwave in your car!
•
Switch selectable for any two shortwave bands from 3 to 18
MHz - you pick the bands!
•
Works with any AM radio - car radios are ideal!
•
Tune from your regular radio dial - easily set station presets,
etc. on your existing radio.
•
Operates on 9 to 15 volts.
•
Listen to worldwide broadcasts in your car, boat, or home.
•
Very sensitive, works as well as thousand dollar receivers!
•
Great project for commuters and those who spend long hours
in the car or truck.
•
Clear, concise step-by-step instructions carefully guide you
to a finished kit that not only works - but you'll learn too!
•
Add our case and knob set for a finished 'Pro' look. Cases
match all Ramsey products.
SHORTWAVE
SC1
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Summary of Contents for Ramsey Electronics SC1
- Page 1 SHORTWAVE CONVERTER KIT Ramsey Electronics Model No. Fascinating listening for all ages and abilities - tunes the world from any standard AM broadcast receiver. Put some ‘spark’ into that commute to work or that long trip, listen to shortwave in your car! •...
- Page 2 Ramsey Electronics publication NO. MSC1 Rev. 1.3a First printing: July 1992 COPYRIGHT 1993 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.
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Page 3: Table Of Contents
Price $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR SHORTWAVE CONVERTER KIT TABLE OF CONTENTS Introduction to the SC1 ......4 What you can expect to hear ....5 Parts list ..........6 SC1 Parts layout ........7 SC1 Circuit description ......8 SC1 Assembly instructions .....9 Setting up the SC1 ........12... -
Page 4: Introduction To The Sc1
The other "ideal" receiver with which to use the SC1 is a good quality AM-FM home stereo system. In fact, an SC1 converter has put fresh life into the stereo system in my own office. Even... -
Page 5: What You Can Expect To Hear
RF output of the SC1 beyond the internal ferrite rod antenna of the AM radio. To get the most from your SC1, we suggest that you plan to use it with a good quality AM radio with an external antenna connection. -
Page 6: Parts List
PARTS SUPPLIED WITH THE SC1 KIT CAPACITORS 1 4.7 or 5 pF disc [marked 4.7 or 5K] (C6) 2 100 pF disc [marked 100, 101, or 101K] (C7,C8) 2 470 pF disc [marked 470 or 471] (C2,C3) 5 .001 uF disc [marked .001, 102, or 1 nF] (C1,C4,C5,C9,C10) 2 .01 uF disc [marked .01, 103, or 10 nF] (C11,C12) -
Page 7: Sc1 Parts Layout
RAMSEY SC1 PARTS LAYOUT SC-1 • 7... -
Page 8: Sc1 Circuit Description
CIRCUIT DESCRIPTION Q3 functions as part of a variable Colpitts oscillator which utilizes S2 and jumper points A,B,C to setup a choice of preferred local oscillator frequencies from 3 to 22 MHz. L2 and C10 may be replaced by a crystal for tuning in a desired range 500 to 1600 KHz around the crystal oscillator frequency. -
Page 9: Sc1 Assembly Instructions
8. Install C3, 470 pF. 9. Install L5, the last of the 3.9 uH inductors. 10. Install C4, .001 uF (marked .001, 102, or 1 nF). Look at the SC1 schematic diagram. You have already wired the entire high-pass filter 11. - Page 10 21. Install C13, 4.7 or 10 uF, the ONLY electrolytic or "polarized" capacitor in the SC1 kit. Electrolytic capacitors have a right and a wrong way they can be installed. The PC board is marked with a '+' sign while the capacitor is usually marked with its negative '-' side.
- Page 11 31. Install C9, .001 uF (marked .001, 102, or 1 nF). Installation of Q3 oscillator coils L1 and L2: The wiring of your SC1 is now finished except for your own plans about how to use and tune it. If you...
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Page 12: Setting Up The Sc1
Ramsey CLG-1 cigarette lighter cord or a similar cord from Radio Shack. You may also make a permanent installation using the appropriate coaxial style DC power plug to the SC1 and "hard" wiring into the car's fuse block. -
Page 13: Setting Your Listening Bands
SC1 to let you tune around your chosen band on your AM-radio. First, let's take a look at what is possible to hear on your SC1. The following are the internationally-designated shortwave broadcasting bands: A. - Page 14 SC1. An easy way to adjust the SC1 is to use another shortwave radio to listen for the SC1's strong oscillator signal. For eample, if you set L1 so that you hear the signal at 9.0 MHz on another receiver, your SC1 is set to receive 9.5...
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Page 15: Understanding What You're Tuning
Let's say that you are listening to Radio Moscow on 11.840 MHz with your radio dial set at 1000 KHz. This means that the SC1 oscillator (L1) is running at 10.840 KHz. This means that your AM radio is also receiving the difference of 10.840 MHz and 1000 KHz, which is 9.840 MHz, also a popular... - Page 16 If you've enjoyed building this kit, why not consider some other fine Ramsey kits? There are other bands to explore and Ramsey has them covered or, how about building your own VHF FM Transceiver? The FX series transceivers from Ramsey are packed with features that allow you to get on FM for less than the cost of someone else's second-hand flea market rig.
- Page 17 SC-1 • 17...
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Page 18: Schematic Diagram
SC-1 • 18... -
Page 19: Ramsey 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... - Page 20 Shortwave Converter Kit Quick Reference Page Guide Introduction to the SC1 ......4 What you can expect to hear ....5 Parts list ..........6 SC1 Parts layout ........7 SC1 Circuit description ......8 SC1 Assembly instructions .....9 Adjusting your listening bands ....13 Understanding what you're tuning ...15 Schematic diagram .........18...
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