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40 METER (7.0 MHZ)
ALL MODE RECEIVER KIT
Ramsey Electronics Model No.
Small in size but BIG in features:
•
Easily tunes SSB, CW, RTTY and AM
•
Smooth varactor tuning of any desired 250KHz segment of the 40
meter band, easily retuned
•
Uses the popular SA602 IC chip for outstanding sensitivity and
efficient operation
•
Front panel RF Gain, Tuning and Volume controls
•
Efficient LM-386 Audio amplifier drives speaker or earphones with a
clean, crisp audio
•
Informative manual answers questions on receivers, hookups and
uses - enhances resale value, too!
•
Ideal companion to the Ramsey QRP-40 CW Transmitter
•
Runs on a standard 9-volt battery
•
Clear, concise assembly instructions lead you to a finished product
that works FIRST time!
•
HR40
1
HR40
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Summary of Contents for Ramsey Electronics HR40
- Page 1 40 METER (7.0 MHZ) ALL MODE RECEIVER KIT Ramsey Electronics Model No. HR40 Small in size but BIG in features: • Easily tunes SSB, CW, RTTY and AM • Smooth varactor tuning of any desired 250KHz segment of the 40 meter band, easily retuned •...
- Page 2 Ramsey Electronics publication No. MHR40 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.
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Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR HR40 AMATEUR RECEIVER KIT TABLE OF CONTENTS Introduction to the HR40 ....4 About Direct Conversion ....5 Circuit description ......6 Parts list ......... 7 Schematic diagram ......9 Parts layout ........10 Assembly instructions .... -
Page 4: Introduction To The Hr40
The Ramsey HR40 has something fun and easy for each of them. Note To Beginners: Building the HR40 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. -
Page 5: About Direct Conversion
ABOUT DIRECT CONVERSION RECEIVERS: The HR40 is a “Direct Conversion” receiving circuit. There is no need for IF (intermediate frequency) circuitry. The receiver “processes” the incoming signal right at its own frequency, with no need to mix or transform it with additional internal oscillators and amplifiers running at intermediate frequencies such as 455 KHz. -
Page 6: Circuit Description
Still another problem is that of AC line hum whenever an unregulated power supply is used rather than batteries. The Ramsey HR40’s use of the SA602 integrated circuit chip offers a circuit configuration that is as immune as any simple superhetrodyne to the classic problems with Direct Conversion receivers. -
Page 7: Parts List
PC mount pushbutton switch (S1) REQUIRED, NOT SUPPLIED: 9-volt battery (alkaline or heavy duty type) Earphone, or small speaker Antenna and suitable cable OPTIONAL: Ramsey Electronics Case and Knob Kit, Model CHR or; Your own choice of enclosure and hardware • HR40... - Page 8 First you will install the larger components so they can be used as markers. So that you don't spend extra time "troubleshooting" we strongly recommend that you follow the assembly strategy and step-by-step procedures we have provided. • HR40...
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Page 9: Schematic Diagram
• HR40... -
Page 10: Parts Layout
PARTS LAYOUT: • HR40... -
Page 11: Assembly Instructions
10. Install C11, a 100-220µF electrolytic capacitor. Remember to observe correct polarity. C10 and C11 provide voltage stabilizing which directly improves the performance of the SA602 oscillator. 11. Install C2, 100pF ceramic disc capacitor (marked 100 or 101). This • HR40... - Page 12 26. nstall U2, the LM386 audio amplifier IC chip. Just like the SA602, you must correctly position the notched or banded end. 27. Install C12, 100-220µF electrolytic capacitor; observe polarity. This capacitor couples the output of the LM-386 to the speaker jack. 28. Install C9, 4.7-10µF electrolytic capacitor; observe polarity. • HR40...
- Page 13 Now is a good time to sit back and admire your work and make a final check of all solder joints and component placement. It is always better to find errors now before you test the HR40, and it’s easier on the ego, too! •...
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Page 14: Initial Testing
INITIAL TESTING OF YOUR HR40: You’re now ready to power up and test your HR40, but before you begin take some time to sweep off your bench of any loose component leads or solder splashes. A clean work area not only makes testing less frustrating but also less prone to problems. -
Page 15: Alignment
Even if your shortwave set does not have a BFO (beat frequency oscillator) for CW-SSB, you’ll still hear a powerful ‘hiss or quieting’ when your shortwave receiver is tuned near the frequency of the HR40. Your shortwave receiver is actually picking up the oscillator signal within the HR40! •... -
Page 16: Using Your Hr40
(LSB), with Upper Sideband (USB) used for 40 - 18 - 15 - 12 - 10 Meter SSB. To check or ‘scan’ a given band for SSB signals, tune your HR40 up from the low end for USB signals and down from the high end for LSB. - Page 17 • MORE AUDIO POWER - ANOTHER WAY If you want to use your HR40 for casual band monitoring while you are busy across the room, in the shop, or to share with a class or club, and want LOTS more volume, try building up our very inexpensive Ramsey BN-9, 2 watt general purpose amplifier kit.
- Page 18 How long will your battery last if you leave your receiver on for a few days, just like we leave our computers and ham gear on all the time? (2) We thought you’d have more fun planning and installing your own lamp that glows in the dark! • HR40...
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Page 19: Troubleshooting Guide
DC power supply. A careful check of all construction WILL solve your problem. Over 95% of the kits returned for repair have nothing more than a simple assembly or construction error! • HR40... -
Page 20: Notes For Experienced Users
ALTERNATE POWER SOURCES: Most of the HR40 circuitry can be operated from 6 to 14 volts without damage or significant modification. However, it is quite important that you carefully hook up with the correct polarity; reverse polarity or excessive voltages WILL damage your kit. - Page 21 PC board within that enclosure will maximize the stability of the oscillator. One to two KHz of slow drift may be expected as components warm to operating temperature; after that the oscillator is reasonably stable • HR40...
- Page 22 It can only boost what it gets directly from the SA602. There is certainly space on the HR40 circuit board to install an audio preamplifier (i.e. 2N3904, or minimum-gain LM386) in the circuit trace between C8, the audiocoupling capacitor from pin 4 of the SA602 to the volume control.
- Page 23 Make sure the receiver is working properly and that you understand how to use and repair it BEFORE making any changes in the original design. Enjoy it! • HR40...
- Page 24 CONSTRUCTION NOTES: • HR40...
- Page 25 • HR40...
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Page 26: Warranty
But on rare occasions a sour component can slip through. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. - Page 27 Please do not include your own hardware such as non-Ramsey cabinets, knobs, cables, external battery packs and the like. Ramsey Electronics, Inc., reserves the right to refuse repair on ANY item in which we find excessive problems or damage due to construction methods.
- Page 28 HR40 AMATEUR RECEIVER KIT Quick Reference Page Guide Introduction to the HR40 ....4 Circuit description ......6 Parts list ..........7 Schematic diagram ......9 Parts layout ........10 Assembly instructions ....11 Initial testing ........14 Alignment ........15 Troubleshooting guide ....19 Warranty ........26 REQUIRED TOOLS •...