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80 METER (3.0 MHZ)
ALL MODE RECEIVER KIT
Ramsey Electronics Model No.
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Add our case and knob set for a finished 'Pro' look. Cases match all
Ramsey products.
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 80 meter
band, easily retuned
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Uses the popular Signetics NE-602 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 QRP-80 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!
HR-80• 1
HR-80
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Related Manuals for Ramsey Electronics HR-80
Summary of Contents for Ramsey Electronics HR-80
- Page 1 • Informative manual answers questions on receivers, hookups and uses - enhances resale value, too! • Ideal companion to the Ramsey QRP-80 CW Transmitter • Runs on a standard 9-volt battery • Clear, concise assembly instructions lead you to a finished product that works FIRST time! HR-80•...
- Page 2 • QRP Power Amplifiers 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. HR-80 AMATEUR RECAIVER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MHR-80 Revision C 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 HR-80 AMATEUR RECEIVER KIT TABLE OF CONTENTS Introduction to the HR-80 ....4 About Direct Conversion ....5 Circuit description ......6 Parts list ......... 7 Schematic diagram ......9 Parts layout ........10 Assembly instructions .... - Page 4 INTRODUCTION: Our HR-40 and HR-80 models are thought of as “best for beginners” because Hams with a Novice or Technician license can operate CW in the 40 and 80 meter bands. If you like plenty of action and DX (long distance) communications, the 40 meter ham band is the place to be.
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Page 5: About Direct Conversion
Therefore, we are pleased to assure you that your manual for the HR-80 receiver and the receiver circuit itself have been designed with an understanding of typical operating needs and expectations for the 80 meter band. This receiver circuit is ideal for discovering just how simple a true “Communications Receiver”... -
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 HR-80’s use of the NE602 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 HR-80• 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. Check off each step as understood and completed.
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Page 9: Parts Layout
Parts Layout: HR-80• 9... - Page 10 You’ll see that one side of the capacitor has a black band and is marked with a ‘-’ sign, this is the negative side, the other side is the positive lead. Make sure you insert the HR-80• 10...
- Page 11 PC-board traces.This particular jumper brings 9 volts from the power switch to the long circuit trace supplying voltage to the entire circuit. Notice how the jumper crosses over the other traces leading from the volume control. 21) Install S1, the power switch. HR-80• 11...
- Page 12 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 HR-80, and it’s easier on the ego, too!
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Page 13: Initial Testing
INITIAL TESTING OF YOUR HR-80: You’re now ready to power up and test your HR-80, 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 14: Alignment
300 KHz range chosen within the 2.5 to 5MHz limits. 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 HR-80• 14... -
Page 15: Using Your Hr-80
(LSB), with Upper Sideband (USB) used for 80 - 18 - 15 - 12 - 10 Meter SSB.To check or ‘scan’ a given band for SSB signals, tune your HR-80 up from the low end for USB signals and down from the high end for LSB. - Page 16 QRP design expert and do not care about future factory service from Ramsey. Even with the circuit protection, the RF signal is just too much for the NE602. The transmitter signal overpowers the NE602, disrupting the internal oscillator.
- Page 17 • MORE AUDIO POWER - ANOTHER WAY If you want to use your HR-80 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 AC hum. If you are using a 9-volt AC power adapter, the adapter design may not be of sufficient quality for this application. Try a bypass capacitor, or a different adapter or a well-designed and filtered DC power supply. HR-80• 18...
- Page 19 ALTERNATE POWER SOURCES: Most of the HR-80 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 20 CW signal so the tone is pleasant and smooth sounding. If you want the opposite of bandspread (that is as MUCH frequency range as possible over full rotation of the tuning knob ) increase the HR-80• 20...
- Page 21 (And we don't mind suggesting that the CT90 makes an attractive, matching companion to your Ramsey Kit mini-station in addition to its many other practical uses!) While you could experiment with an RF pickup loop or tuned circuit and counter preamplifier to boost the oscillator’s...
- Page 22 It can only boost what it gets directly from the NE602. There is certainly space on the HR-80 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 NE602 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! HR-80• 23...
- Page 24 CONSTRUCTION NOTES: HR-80• 24...
- Page 25 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 26 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...
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Page 27: Troubleshooting Guide
HR-80 AMATEUR RECEIVER KIT Quick Reference Page Guide Introduction to the HR-80 ....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 TOTAL SOLDER POINTS •...