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30 METER (10 MHZ)
ALL MODE RECEIVER KIT
Ramsey Electronics Model No.
Here's the ideal mini-receiver for catching all the busy action on 30
meters from your office, home or on trips!
Small in size but BIG in features:
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Easily tunes SSB, CW, RTTY and AM
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Smooth varactor tuning of any desired 250KHz segment of the 30
meter band, easily retuned
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Uses the SA602 IC chip for outstanding sensitivity and efficient
operation
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Front panel RF Gain, Tuning and Volume controls
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Efficient LM-386 Audio amplifier drives speaker or earphones with a
clean, crisp audio
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Informative manual answers questions on receivers, hookups and
uses - enhances resale value, too!
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Ideal companion to the Ramsey QRP30 CW Transmitter
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Runs on a standard 9-volt battery
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Clear, concise assembly instructions lead you to a finished product
that works FIRST time!
HR30• 1
HR30
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Related Manuals for Ramsey Electronics HR30
Summary of Contents for Ramsey Electronics HR30
- Page 1 • Informative manual answers questions on receivers, hookups and uses - enhances resale value, too! • Ideal companion to the Ramsey QRP30 CW Transmitter • Runs on a standard 9-volt battery • Clear, concise assembly instructions lead you to a finished product that works FIRST time! HR30•...
- Page 2 RAMSEY MINI-KITS Many other kits are available for hobby, school, Scouts and just plain FUN. New kits are always under development. Write or call for our free Ramsey catalog. HR30 AMATEUR RECAIVER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MHR30 Revision C1 First printing: January 1995 COPYRIGHT 1994 by Ramsey Electronics, Inc.
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Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR HR30 AMATEUR RECEIVER KIT TABLE OF CONTENTS Introduction to the HR30 ....4 About Direct Conversion ....5 Circuit description ......6 Parts list ......... 7 Schematic diagram ......9 Parts layout ........10 Assembly instructions .... - Page 4 The Ramsey HR30 has something fun and easy for each of them. Note To Beginners: Building the HR30 is really no harder than any other of our 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.
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Page 5: About Direct Conversion
ABOUT DIRECT CONVERSION RECEIVERS: The HR30 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 HR30’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 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 HR30• 7...
- Page 8 Since we are trying to keep assembly of the board simple, we will not be able to fully describe each individual component’s function as you build, but Ramsey's "Learn-As-You-Build" kit assembly philosophy still stands.
- Page 9 HR30• 9...
- Page 10 HR30 PARTS LAYOUT DIAGRAM HR30• 10...
- Page 11 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, 75pF ceramic disc capacitor (marked 75 or 75K). This HR30• 11...
- Page 12 23. Install the 9-volt battery snap connector, making sure that the red (+) and black (-) leads are correctly installed. 24. Install C7, .01µF ceramic disc capacitor (marked 103 or .01 or 10nF). 25. Install C8, a small 4.7-10µF electrolytic capacitor. Observe correct HR30• 12...
- 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 HR30, and it’s easier on the ego, too! HR30• 13...
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Page 14: Initial Testing
INITIAL TESTING OF YOUR HR30: You’re now ready to power up and test your HR30, 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
Adjust L1 for maximum received signal strength. Now you’re ready to receive on-the-air signals! After you get used to its tuning and performance, you can adjust the tuning control, L1 and L2 to get the exact tuning range you want. HR30• 15... - Page 16 (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 HR30 up from the low end for USB signals and down from the high end for LSB. Unfortunately most signals on 30 meters will be CW or other types of digital communications.
- Page 17 • MORE AUDIO POWER - ANOTHER WAY If you want to use your HR30 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 They expect it and depend on it , reminding us that “real radios glow in the dark!” Adding a simple LED power-on indicator to your Ramsey HR30 is easy. All you need is the LED itself and a small 1K or 2.2K resistor. Study the PC traces between the positive battery supply wire and the on-off switch.
- Page 19 DC receiver design, we encourage you to use our HR-series for reliable building blocks for achieving maximum performance for your own application. If a good idea does not work as expected, you can easily restore your Ramsey receiver to its original circuit configuration.
- Page 20 ALTERNATE POWER SOURCES: Most of the HR30 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 This will consist of a short piece of mini-coax to a 1 megohm resistor bridged by a 27 to 33pF capacitor as shown: With the RF gain turned all the way up , it may be possible to hear the HR30• 21...
- Page 22 C8, the audiocoupling capacitor from pin 4 of the SA602 to the volume control. The following is an audio preamplifier idea submitted by one of our customers. Ramsey Electronics in no way warrants that this modification will achieve any particular ideal signal-to-noise ratio or audio frequency response, but is does significantly boost the output of the SA602 reaching the LM386 audio amplifier IC.
- 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! HR30• 23...
- Page 24 CONSTRUCTION NOTES: HR30• 24...
- Page 25 HR30• 25...
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Page 26: Warranty
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 with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase. - Page 27 5. INCLUDE a description of the problem and legible return address. DO NOT send a separate letter; include all correspondence with the unit. 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...
- Page 28 HR30 AMATEUR RECEIVER KIT Quick Reference Page Guide Introduction to the HR30 ....4 Circuit description ......6 Parts list ..........7 Schematic diagram ......9 Parts layout ........10 Assembly instructions ....11 Alignment ........15 Warranty ........26 REQUIRED TOOLS TOTAL SOLDER POINTS • Soldering Iron Ramsey WLC100 •...