Ramsey_HR-40_user.pdf

《Ramsey_HR-40_user.pdf》由会员分享，可在线阅读，更多相关《Ramsey_HR-40_user.pdf（27页珍藏版）》请在收音机爱好者资料库上搜索。

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 Uses the popular Signetics NE-602 IC chip for outstanding sensiti

2、vity 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 C

3、W Transmitter Runs on a standard 9-volt battery Clear, concise assembly instructions lead you to a finished product that works FIRST time! RAMSEY TRANSMITTER KITS FM100 Professional FM Stereo Transmitter FM25 Synthesized Stereo Transmitter AM1, AM25 AM Transmitters TV6 Television Transmitter RAMSEY

4、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 SP1 Speakerphone WCT20 Wizard Cable Tracer PH10 Peak hold Meter LC1 Inductance-Capacitance Meter RAMS

5、EY AMATEUR RADIO KITS FX146 VHF Transceivers HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW700 Micro Memory CW Keyer CPO3 Code Practice Oscillator Packet Computer Interfaces QRP Power Amplifiers RAMSEY MINI-KITS Many other kits are available for hobby, school, Scouts and just plain

6、 FUN. New kits are always under development. Write or call for our free Ramsey catalog. HR40 AMATEUR RECAIVER KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MHR40 Revision C First printing: January 1995 COPYRIGHT 1994 by Ramsey Electronics, Inc. 793 Canning Parkway, Victor, New York 14564

7、. 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. HR40 AMATEUR RECEIVER KIT Ramsey Publication No. MHR40 Price $5.00 TABLE OF CONTENTS Introduction to the HR40 .4 About

8、 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 HR40 .16 Troubleshooting guide .19 Notes for experienced users .20 Warranty .26 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR RAMSEY ELECT

9、RONICS, INC. 793 Canning Parkway Victor, New York 14564 Phone (716) 924-4560 Fax (716) 924-4555 INTRODUCTION: Our HR40 and HR80 models are thought of as “best for beginners” because Hams with a Novice or Technician licenses can operate CW in the 80 and 40 meter bands. If you like plenty of action an

10、d DX (long distance) communications, the 40 meter Ham band is the place to be. Almost 24 hours a day theres something interesting happening on 40 meters. These are several groups of people who will enjoy this Ramsey HR40 Receiver: Experienced Ham operators who want a simple extra receiver for keepin

11、g one ear on 40 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 40 meter projects. QRP builders not interested in our warranty or following our step-by-st

12、ep 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 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

13、series. Just follow the directions carefully. All you need to know to successfully complete this receiver is contained in this detailed manual. Enjoy your HR40 receiver. RAMSEY HR-SERIES AMATEUR RECEIVERS: All Ramsey Direct Conversion Receiver Kits share the same basic PC-boards and most components

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

15、ther 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 considerations on higher frequencies. Also, some bands appeal to QRP operators more than others, and som

16、e are better suited for portable and travel use. Therefore, we are pleased to assure you that your manual for the HR40 receiver and the receiver circuit itself has been designed with an understanding of typical operating needs and expectations for the 40 meter band. This receiver circuit is ideal fo

17、r discovering just how simple a true “Communications Receiver” can be. Thats right- there is a BIG difference between the Ramsey HR40 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 rece

18、ivers 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 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 tra

20、nsform 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 s

21、eparate 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

22、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 pair of transistors, or a dual gate FET transistor, or various ICs. The Ramsey HR40 efficiently utilizes

23、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. Advantages of any Direct Conversion receiver include: It is simple, and therefore economical and easy to build It is quite sensitive ev

24、en 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 roll

25、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 the r

26、eceiver 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 HR40s use of the NE602 i

27、ntegrated 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 AC hum

28、. 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 KHz tun

29、ing 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. PARTS SUPPLIED WITH THE HR40 KIT: CAPACITORS: 1 .001F disc capacitor marked 102, .001 or 1nF (C3) 3 100

30、pF disc capacitor marked 100 or 101K (C1,C2,C4) 3 .01F disc capacitor marked 103 , .01 or 10nF (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 (R1,R2,R3) 1 270 ohm resistor red-violet-brown (R4) 2 10K resistor

31、s brown-black orange (R5,R6) INDUCTORS: 1 Shielded Coil K6883 or K6886 (L2) 1 Antenna input transformer marked 421F-123 (L1) SEMICONDUCTORS: 1 1N4002 Diode black epoxy style (D1) 1 NE602 IC (U1) 1 LM386 IC (U2) 1 6.2 volt Zener Diode small glass body (D2) HARDWARE AND MISC: 1 Drilled printed-circuit

32、 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 Antenna and suitable cable

33、OPTIONAL: Ramsey Electronics Case and Knob Kit, Model CHR or; Your own choice of enclosure and hardware LEARN-AS-YOU-BUILD ASSEMBLY STRATEGY: To help you learn just what exactly is going on well discuss the purpose of most of the components or groups of components as we go along. Since we are trying

34、 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 schematic diagram and PC-board X-ray illust

35、ration 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 foil trace both become hot enough togeth

36、er 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 placed flat to the board, and the leads a

37、re 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 you can see in examining the circuit

38、 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 strongly recommend that you follow th

39、e assembly strategy and step-by-step procedures we have provided. PARTS LAYOUT: RECEIVER ASSEMBLY: ?1. Install the RCA antenna jack, J1. Solder all four points. ?2. Install C5, a .01F ceramic disc signal coupling capacitor. This capacitor brings the signal up to the front of the PC board. Notice the

40、 long PC trace from J1 through C5 to R1 ?3. Install potentiometer R1, the RF gain control. Insert it into the PC board so that it seats firmly and is straight and even. Solder the three pins and the two mounting tabs. ?4. Install L1(marked 421F-123), which tunes or preselects the signal input from t

41、he 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 remembering to orient and install the NE602 correctly. Please dont be afraid to solder U1 directly t

42、o 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 RF attenuator) and to a tuned circuit composed of L1 and its internal capacito

43、r. Inductor L1 allows us to match and tune the 40 meter band signals to the NE602s input. ?6. Install C6, .01F (marked 103, .01, 10nF). This capacitor bypasses pin 2 of the NE602 to ground. Bypass means to provide a nice low impedance (impedance means AC resistance) path to ground. ?7. Install R4, 2

44、70 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 voltage regulator by keeping the voltage across it constant. ?9. Install

45、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 negative side, the other side is the positive lead. Make sure you i

46、nsert 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 which directly improves the performance of the NE602 oscillator. ?11. Install C2, 100pF ceramic disc capa

47、citor (marked 100 or 101). 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, 100pF disc capacitor (marked 100 or 101K). ?13. Install C3, .001F disc capacitor (marked 102 or .001 or 1nF). ?14. Install L2, shielded oscillator coil (marked K6883 or K6886). ?15. Install C4, 100pFdisc capacitor (marked 100 or 101). C4 adds variable capacitance of the varactor tuning network to