Ramsey_HR-80_user.pdf

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1、 80 METER (3.0 MHZ) ALL MODE RECEIVER KIT Ramsey Electronics Model No. HR-80 Add our case and knob set for a finished Pro look. Cases match all Ramsey products. Small in size but BIG in features: Easily tunes SSB, CW, RTTY and AM Smooth varactor tuning of any desired 250KHz segment of the 80 meter b

2、and, easily retuned Uses the popular Signetics NE-602 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,

3、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 2 RAMSEY TRANSMITTER KITS FM-10 FM Stereo Transmitter FM-1,2,3,4 FM Wi

4、reless Microphones PB-1 Telephone Transmitter RAMSEY RECEIVER KITS FR-1 FM Broadcast Receiver AR-1 Aircraft Band Receiver SR-1 Shortwave Receiver AA-7 Active Antenna SC-1 Shortwave Converter RAMSEY HOBBY KITS SG-7 Personal Speed Radar SS-70 Speech Scrambler SP-1 Speakerphone MD-3 Microwave Motion De

5、tector PH-10 Peak hold Meter LC-1 Inductance-Capacitance Meter RAMSEY AMATEUR RADIO KITS FX Series VHF and UHF Transceivers HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW-700 Micro Memory CW Keyer PA Series VHF and UHF Power Amplifiers Packet Computer Interfaces QRP Power Amplifier

6、s 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

7、1995 COPYRIGHT 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. R A M S E Y E L E C T R O N I

8、 C S B e s t k i t b u i l d e r s i n t h e w o r l d HR-80 3 HR-80 AMATEUR RECEIVER KIT Ramsey Publication No. MHR-80 Price $5.00 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 instructio

9、ns .11 Initial testing .14 Alignment .15 Using your HR-80 .16 Troubleshooting guide .19 Notes for experienced users .20 Warranty .26 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR HR-80 4 INTRODUCTION: Our HR-40 and HR-80 models are thought of as “best for beginners” because Hams with a Novice or Technicia

10、n 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. Almost 24 hours a day theres something interesting happening on 80 meters. These are several groups of people who will enjoy this Ramse

11、y HR-80 Receiver: Experienced Ham operators who want a simple extra receiver for keeping one ear on 80 meters while doing something else. Beginners who would like to start by listening in on one of Ham radios most active bands. QRP builders who want a quick, easy and reliable NE602 board kit for 80

12、meter projects. QRP builders not interested in our warranty or following our step-by- step assembly and use directions, but who want to get their hands on our most versatile receiver PC-board and parts kit for their own projects. The Ramsey HR-80 has something fun and easy for each of them. Note To

13、Beginners: Building the HR-80 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. Enjoy your HR-80 receiver. RAMSEY HR-SERIES AMATEUR RECEIVERS: All

14、 Ramsey Direct Conversion receiver Kits share the same basic PC- boards and most components which are not frequency critical. However, there are enough differences among the band characteristics, desirable operating features for each band, and differences among the people who would most typically ch

15、oose a particular band, that a separate instruction manual is published for each receiver. Other circuit details which vary from band to band include the tuning range provided by the varactor circuit. “Bandspread” for favorite band segments is easy on 160 or 80 meters but requires other consideratio

16、ns on higher frequencies. Also, some bands appeal to QRP operators more than others, and some are better suited for portable and travel use. HR-80 5 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 understandin

17、g 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” can be . Thats right- there is a BIG difference between the Ramsey HR-80 and other simple short wave radio circuits we can try to build

18、. Yet it is very easy to build. Our HR-series are by far the easiest to build of all the Ramsey kit receivers and therefore very nice for radio newcomers. Consequently, our manuals for the 40 and 80 meter receivers are written with beginners in mind, since both of these bands offer Novice and Techni

19、cian privileges. The manuals for the 30 and 20 meter versions assume the general Ham radio know-how that should accompany a General Class or higher license. ABOUT DIRECT CONVERSION RECEIVERS: The HR-80 is a “Direct Conversion” receiving circuit. There is no need for IF(intermediate frequency) circui

20、try. 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. The advantage of this type of receiver is that it permits tuning of CW, AM and SS

21、B signals with no need for a separate BFO. (A BFO or “beat frequency signal oscillator” is an entirely separate oscillator circuit used in the IF “intermediate frequency” section of a superhetrodyne receiving circuit). Since this frequency is designed specifically for SSB and CW, you will also hear

22、the carrier signal of any AM shortwave broadcast station. The most elementary “DC” receiver consists of just an oscillator and an antenna connected to the inputs of a “Product Detector” whose tiny audio output is then amplified for listening. A product detector can be made from simple diodes, or a p

23、air of transistors, or a dual gate FET transistor, or various ICs. The Ramsey HR-80 efficiently utilizes the Signetics NE602 IC for both the tunable oscillator and the product detector circuits, giving the equivalent of seven transistors in the mixer- oscillator stages. HR-80 6 Advantages of any Dir

24、ect Conversion receiver include: It is simple, and therefore economical and easy to build It is quite sensitive even with a simple antenna Its tuning oscillator could even be set up to serve directly as a transmitter VFO in a simple transceiver setup. A common problem with DC receivers is that they

25、are easily overwhelmed by strong AM broadcast stations from almost anywhere, whether its your local rock and roll broadcaster, Radio Moscow or the Voice of America. Even popular classics like Heath Kits HW-8 QRP transceiver exhibit this characteristic to a frustrating degree. Another problem with DC

26、 receivers is called “microphonics” which is a phenomenon where almost anything in the physical circuitry of the receiver can act as a sort of microphone or audio sound pickup. Touch or bump such radios and you will hear a thump or ring in the speaker or earphones. Still another problem is that of A

27、C line hum whenever an unregulated power supply is used rather than batteries. The Ramsey HR-80s 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. The receiver is not as eas

28、ily overloaded by the VOA or Radio Moscow broadcasts, and there are few annoying ”microphonics” or incurable AC hum. Circuit Description: U1 combines a double-balanced active mixer and oscillator in a single 8-pin IC chip. L1 peaks the RF input to pins 1 and 2 of U1. L2, with varactor diode D1 and R

29、2, C1, C2, and C4, control the resonant frequency of U1s internal oscillator. Rotating R2 gives about a 250 KHz tuning range. The audio output is fed from pins 4 and 5 through R3 (volume control) directly to the LM 386 audio amplifier. R1 controls RF gain. C9 boosts the gain figure of the LM 386 fro

30、m 20 to 50. HR-80 7 PARTS SUPPLIED WITH THE HR-30 KIT: CAPACITORS: ?2 150pF disc capacitor marked 150 or 151 (C1,C2) ?5 .01F disc capacitor marked 103 , .01 or 1nF (C3,C4,C5,C6,C7) ?1 2.2F electrolytic (C8) ?1 4.7 to 10F electrolytic capacitor (C9) ?3 100-220F electrolytic capacitor (C10,C11,C12) RE

31、SISTORS: ?3 10K ohm potentiometers (R1,R2,R3) ?1 270 ohm resistor red-violet-brown (R4) ?2 10K resistors brown-black orange (R5,R6) INDUCTORS: ?2 Shielded Coils 5015-015 (L1,L2) SEMICONDUCTORS: ?2 1N4002 Diode black epoxy style (D1,D3) ?1 NE602 IC (U1) ?1 LM386 IC (U2) ?1 6.2 volt Zener Diode small

32、glass body (D2) HARDWARE AND MISC: ?1 Drilled printed-circuit board ?1 9-volt battery hold-down bracket ?1 9-volt battery connector ?1 RCA-style jack antenna connector (J1) ?1 subminiature earphone jack (J2) ?1 PC mount pushbutton switch (S1) REQUIRED, NOT SUPPLIED: ?9-volt battery (alkaline or heav

33、y 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 8 LEARN-AS-YOU-BUILD ASSEMBLY STRATEGY: To help you learn just what exactly is going on well discuss the purpose of mos

34、t of the components or groups of components as we go along. Since we are trying to keep assembly of the board simple, we will not be able to fully describe each individual components function as you build, but Ramseys Learn-As-You-Build kit assembly philosophy still stands. Check off each step as un

35、derstood and completed. Examine the schematic diagram and PC-board X-ray illustration as you proceed. In all steps, “install” means to insert into the correct PC-board holes, solder properly, and trim all excess component leads. Use good soldering skills - let your soldering iron heat each connectio

36、n wire so that the wire itself and the foil trace both become hot enough together to melt the applied solder so that it flows smoothly around the wire lead and on to the PC board trace. Mount all electrical parts on the top side of the board provided. This is the side that has no traces or pads on i

37、t. When parts are installed, they are placed flat on the board, and the leads are bent on the backside of the board to prevent the part from falling out before soldering. The part is then soldered securely to the board, and the remaining lead length is then clipped off. The clipped off leads should

38、be saved for later use as jumper wires. As you can see in examining the circuit board and parts there are many tall components such as the potentiometer, capacitors, and switches along with a lot of small parts. First you will install the larger components so they can be used as markers. So that you

39、 dont spend extra time troubleshooting we strongly recommend that you follow the assembly strategy and step-by-step procedures we have provided. HR-80 9 Parts Layout: HR-80 10 RECEIVER ASSEMBLY: ?1) Install the RCA antenna jack, J1. Solder all four points. ?2) Install C5, a .01F ceramic disc signal

40、coupling capacitor. This capacitor brings the signal up to the front of the PC board. Notice the long PC trace from J1 through C5 to R1 ?3) Install potentiometer R1, the RF gain control. Insert it into the PC board so it seats firmly and is straight and even. Solder the three pins and the two mounti

41、ng tabs. ?4) Install L1(marked 5015-015), which tunes or preselects the signal input from the antenna through C5 and R1 ?5) Install U1, the NE602 IC mixer-oscillator. The marked end of the IC (band or dot) must face the FRONT of the PC board. If you wish, install an 8-pin DIP socket, still rememberi

42、ng to orient and install the NE602 correctly. Please dont be afraid to solder U1 directly to the board as we have seen more repair problems with DIP sockets than from direct soldering of IC chips. The parts that we have put in so far bring the signal from the antenna jack up to the RF Gain control (

43、actually the RF attenuator) and to a tuned circuit composed of L1 and its internal capacitor. Inductor L1 allows us to match and tune the 80 meter band signals to the NE602s input. ?6) Install C6, .01F. This capacitor bypasses pin 2 of the NE602 to ground. Bypass means to provide a nice low impedanc

44、e (impedance means AC resistance) path to ground. ?7) Install R4, 270 ohms (red-violet-brown), which drops the 9 volt battery supply to 6-7 volts, safe for the NE602. ?8) Install D2, 6.2 volt Zener diode. This is the smaller of the two diodes and has a painted glass body. This diode acts as a voltag

45、e regulator by keeping the voltage across it constant. ?9) Install C10, a 100-220F electrolytic capacitor. Electrolytic capacitors are marked by polarity and must be installed in the proper direction. Youll see that one side of the capacitor has a black band and is marked with a - sign, this is the

46、negative side, the other side is the positive lead. Make sure you insert the HR-80 11 positive lead into the + marked hole on the PC board. ?10) Install C11, a 100-220F electrolytic capacitor. Remember to observe correct polarity. C10 and C11 provide voltage stabilizing which directly improves the p

47、erformance of the NE602 oscillator. ?11) Install C2, 150pF ceramic disc capacitor (marked 150 or 151). This capacitor is a first step in setting up the resonant frequency of the NE602s internal oscillator, using the resonant LC circuit to be created along with C1, C3 and L1. ?12) Install C1, 150pF d

48、isc capacitor (marked 150 or 151). ?13) Install C3, .01F disc capacitor (marked 103 or .01 or 10nF). ?14) Install L2, shielded oscillator coil (marked 5015). ?15) Install C4, .01F disc capacitor (marked 103 or .01 or 10nF). C4 adds variable capacitance of the varactor tuning network to the oscillator circuit already fo