Ramsey_HR-30_user.pdf

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1、 30 METER (10 MHZ) ALL MODE RECEIVER KIT Ramsey Electronics Model No. HR30 Heres 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: Easily tunes SSB, CW, RTTY and AM Smooth varactor tuning of any desired 250KHz

2、 segment of the 30 meter band, easily retuned Uses the 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 rece

3、ivers, 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 2 RAMSEY TRANSMITTER KITS FM100B Professional FM Stereo Transmitt

4、er FM25B Synthesized Stereo Transmitter AM1, AM25 AM Transmitters TV6 Television Transmitter RAMSEY RECEIVER KITS FR1 FM Broadcast Receiver AR1 Aircraft Band Receiver SR2 Shortwave Receiver AA7 Active Antenna SC1 Shortwave Converter RAMSEY HOBBY KITS SG7 Personal Speed Radar SS70A Speech Scrambler S

5、P1 Speakerphone WCT20 Wizard Cable Tracer ECG1 Heart Monitor TFM3 Tri-Field Meter RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator DDF1 Doppler Direction Finder QRP Power Amplifiers RAMSEY MINI-KITS Many other kits are

6、 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 Electroni

7、cs, 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. Printed in the United States of America. HR30 3 HR30 AMATEUR RECEIVER KIT Ramsey Publication No. MHR3

8、0 Price $5.00 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 . 11 Initial testing . 14 Alignment . 15 Using your HR30 . 16 Troubleshooting guide . 19 Notes for experienced

9、 users . 20 Warranty . 26 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR HR30 4 INTRODUCTION: Our HR40 and HR80 models are thought of as “best for beginners” because Hams with a Novice or Technician license can operate CW in the 80 and 40 meter bands. If you like If you like plenty of action and DX (long d

10、istance) communications, the 30 meter ham band is the place to be. Almost 24 hours a day there is something interesting happening on 30 meters. There are several groups of people who will enjoy this Ramsey HR30 Receiver: Experienced ham operators who want a simple extra receiver for keeping one ear

11、on 30 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 SA602 board kit for 30 meter projects. QRP builders not interested in our warranty or following our step-by-step assembl

12、y 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 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. Ju

13、st follow the directions carefully. All you need to know to successfully complete this receiver is contained in this detailed manual. Enjoy your HR30 receiver. RAMSEY HR-SERIES AMATEUR RECEIVERS: All Ramsey Direct Conversion receiver Kits share the same basic PC-boards and most components which are

14、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 choose a particular band, that a separate instruction manual is published for each receiver. Other circu

15、it 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 considerations on higher frequencies. Also, some bands appeal to QRP operators more than others, and some are bett

16、er suited for portable and travel use. Therefore, we are pleased to assure you that your manual for the HR30 receiver and the receiver circuit itself have been designed with an understanding of typical operating needs and expectations for the 30 meter band. This receiver circuit is ideal for discove

17、ring just how simple a true HR30 5 “Communications Receiver” can be . Thats right- there is a BIG difference between the Ramsey HR30 and other simple short wave radio circuits we can try to build. Yet it is very easy to build. Our HR-series are by far the easiest to build of all the Ramsey kit recei

18、vers 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 Technician privileges. The manuals for the 30 and 20 meter versions assume the general ham radio know-how that

19、should accompany a General Class or higher license. 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 tran

20、sform 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 SSB signals with no need for a separate BFO. (A BFO or “beat frequency signal oscillator” is an entirely se

21、parate 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 the carrier signal of any AM shortwave broadcast station. The most elementary “DC” receiver consists of j

22、ust 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 pair of transistors, or a dual gate FET transistor, or various ICs. The Ramsey HR30 efficiently utilizes t

23、he Signetics SA602 IC for both the tunable oscillator and the product detector circuits, giving the equivalent of seven transistors in the mixer-oscillator stages. HR30 6 Advantages of any Direct Conversion receiver include: It is simple, and therefore economical and easy to build It is quite sensit

24、ive 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 are easily overwhelmed by strong AM broadcast stations from almost anywhere, whether its your local rock and

25、 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 receivers is called “microphonics” which is a phenomenon where almost anything in the physical circuitry of

26、 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 AC line hum whenever an unregulated power supply is used rather than batteries. The Ramsey HR30s use of the S

27、A602 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 easily overloaded by the VOA or Radio Moscow broadcasts, and there are few annoying ”microphonics” or incurable

28、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 R2, C1, C2, and C4, control the resonant frequency of U1s internal oscillator. Rotating R2 gives about a 250 K

29、Hz 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 from 20 to 50. HR30 7 PARTS SUPPLIED WITH THE HR30 KIT: CAPACITORS: 2 47pF disc capacitor marked 150 or 151 (C4,

30、 optional C14) 1 .001F disc capacitor marked 102, .001 or 10nF (C3) 2 75pF disc capacitor C1,C2 (marked 75 or 75K) 3 .01F disc capacitor marked 103 , .01 or 1nF (C5,C6,C7) 2 4.7 to 10F electrolytic capacitor (C8,C9) 3 100-220F electrolytic capacitor (C10,C11,C12) RESISTORS: 3 10K ohm potentiometers

31、(R1,R2,R3) 1 270 ohm resistor red-violet-brown (R4) 2 10K resistors brown-black orange (R5,R6) INDUCTORS: 2 Shielded Coils marked 42IF-123 (L1,L2) SEMICONDUCTORS: 1 1N4002 Diode black epoxy style (D1) 1 SA602 IC (U1) 1 LM386 IC (U2) 1 6.2 volt Zener Diode small glass body(D2) HARDWARE AND MISC: 1 Dr

32、illed 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 heavy duty type) Earphone, or small speaker Antenn

33、a and suitable cable OPTIONAL: Ramsey Electronics Case and Knob kit, Model CHR or; Your own choice of enclosure and hardware HR30 8 LEARN-AS-YOU-BUILD RECEIVER ASSEMBLY STRATEGY: To help you learn just what exactly is going on well discuss the purpose of most of the components or groups of component

34、s 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 understood and completed. Examine the schema

35、tic 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 connection wire so that the wire itself and the foi

36、l 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 it. When parts are installed, they are plac

37、ed flat to 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 be saved for later use as jumper wires. As

38、 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 dont spend extra time troubleshooting we

39、strongly recommend that you follow the assembly strategy and step-by-step procedures we have provided. HR30 9 HR30 10 HR30 PARTS LAYOUT DIAGRAM HR30 11 RECEIVER ASSEMBLY: 1. Install the RCA antenna jack, J1. Solder all four points. 2. Install C5, a .01F ceramic disc capacitor (marked 103 or .01 or 1

40、0nF). for signal coupling. 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

41、mounting tabs. 4. Install L1, which tunes or preselects the signal input from the antenna through C5 and R1. 5. Install U1, the SA602 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 remembering to orient

42、 and install the SA602 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 (actually the

43、 RF attenuator) and to a tuned circuit composed of L1 and its internal capacitor. Inductor L1 allows us to match and tune the 30 meter band signals to the SA602s input. 6. Install C6, .01F ceramic disc capacitor (marked 103 or .01 or 10nF). This capacitor bypasses pin 2 of the SA602 to ground. Bypas

44、s means to provide a nice low impedance (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 SA602. 8. Install D2, 6.2 volt Zener diode. This is the smaller of the two diodes and has a painted gla

45、ss body. This diode acts as a voltage 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

46、 marked with a - sign, this is the negative side, the other side is the positive lead. Make sure you insert the 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 whic

47、h directly improves the performance of the SA602 oscillator. 11. Install C2, 75pF ceramic disc capacitor (marked 75 or 75K). This HR30 12 capacitor is a first step in setting up the resonant frequency of the SA602s internal oscillator, using the resonant LC circuit to be created along with C1, C3 and L1. 12. Install C1, 75pF disc capacitor (marked 75 or 75K). 13. Install C3, .001F ceramic disc capacitor (marked 102 or .001 or 10nF). 14. Before installing L2 (marked 42IF-123), examine the inductor. Look at the bottom side and youll see a small silver and brown tubular part nested with