Ramsey_FR-10_user.pdf

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1、 10 METER FM RECEIVER KIT Ramsey Electronics Model No. FR10 Check out the 10 meter action with this simple and fun to build FM receiver. Receive crystal-clear signals from thousands of miles away! Ten meters is a fascinating band! Tune the entire 10 Meter band or the VHF low Police and Fire band. Tu

2、nes any 5 MHz portion of the 25 to 35 MHz band. Excellent performance, less than 1 uV sensitivity. Tuned input, low noise preamp stage. True Dual-conversion superhet design with 2 pole Ceramic High IF and 6 pole Ceramic low IF filters! Front Panel Volume, Squelch, and Tuning controls. Excellent rece

3、iver for beginners and seasoned pros! Informative manual answers questions on theory, hook- ups, and uses - enhances resale value, too! Add our case set for a finished Pro look. Cases match all Ramsey products. Clear, concise assembly instruction carefully guides you to a finished kit that works the

4、 FIRST time! FR-10 2 PARTIAL LIST OF AVAILABLE KITS RAMSEY TRANSMITTER KITS FM10A FM Stereo Transmitter FM25B Synthesized FM Stereo Transmitter AM25 Synthesized AM Transmitter AM1 AM Transmitter RAMSEY RECEIVER KITS FR1 FM Broadcast Receiver AR1 Aircraft Band Receiver AA7 Active Antenna SC1 Shortwav

5、e Converter RAMSEY HOBBY KITS SG7 Personal Speed Radar SS70 Speech Scrambler TT1 Telephone Recorder SP1 Speakerphone MD3 Microwave Motion Detector TFM3 Tri-Field Meter LC1 Inductance-Capacitance Meter ECG1 Heart Monitor RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Trans

6、mitters CPO3 Code Practice Oscillator DDF1 Doppler Direction Finder 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. FR10 10 METER FM RECEIVER KIT INSTRU

7、CTION MANUAL Ramsey Electronics publication NO. MFR10 Rev. E1 First printing: January 1992 COPYRIGHT 1992 by Ramsey Electronics, 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 R

8、amsey Electronics, Inc. Printed in the United States of America. FR-10 3 FR10 10 METER FM RECEIVER KIT Ramsey Publication No. MFR10 Price $5.00 TABLE OF CONTENTS Introduction to the FR10 . 4 Circuit Description . 5 Parts List . 6 Simplified Block Diagram . 8 Parts Layout Diagram . 9 FR10 Assembly In

9、structions . 11 Schematic Diagram . 14 Testing and Alignment . 20 Enclosure Ideas . 23 Troubleshooting Guide . 24 Notes for Advanced Users . 25 Ramsey Kit Warranty . 27 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR FR-10 4 INTRODUCTION Theres not a lot to say about using the FR10 receiver once its been co

10、rrectly built and aligned. If 10 meters is dead youll hear little or nothing. If Ten is open there will be an amazing variety of crystal- clear signals from many thousands of miles away. In the first serious test of this receiver, booming signals from the US Northeast and Midwest as well as Scotland

11、 and Ireland were logged from a site in Florida! The strength and clarity of GM4DLU in Scotland was simply astounding! Another listening session logged a station in Washington, DC conversing with one in Wisconsin via a repeater in Dallas! This receiver is a good project for amateurs wishing to becom

12、e more familiar with 10 meter FM before choosing a transceiver, or for those active on 10 who want an inexpensive receiver to take on trips, keep in a briefcase or to watch for band openings. Most Ramsey Electronics can be classified as Skill Level 1 if we use the old Heathkit guidelines for ease of

13、 assembly. That means that our kits are intended to be successful for first-time kit builders. This FR10 FM Receiver is best regarded as a Skill Level 2 project, and should not be taken lightly, even by experienced, licensed radio amateurs. Still, this step-by-step manual is written with the beginne

14、r in mind, because we are well aware of the fascination that Ten Meters and its maze of repeaters holds for newcomers, which means this could be your very first kit project. The same holds true for those who just want to peek in on LOW VHF public service communications without the cost of a scanner.

15、 To be honest, wed like to see first-time builders start out with an easier kit such as the Ramsey HR40 Forty Meter receiver before assembling the FR10, but we are confident that you can construct the FR10 successfully if you follow this manual carefully and patiently. Before beginning the project o

16、r even studying the circuit description, it is worthwhile to develop some prior respect for how much receiver is packed onto the circuit board. The nine semiconductor devices (diodes, transistors and IC chips) give the equivalent of about 30 or more transistors and diodes. And, in addition to four i

17、nductors, a FR-10 5 crystal and two ceramic filters, there are nearly 60 capacitors and resistors. Surely, all that should result in a decent receiver! You could easily spend twice the money plus hours of time trying to gather the equivalent parts from catalogs and still need to make your own circui

18、t board. BUILDING YOUR FR10 KIT There are just over 200 solder connections on the FR10 printed circuit board. That means your work could be 99% excellent and you could STILL have 2 or 3 cold solder points or solder bridges. Since this circuit is more sophisticated than a direct-conversion HF receive

19、r or a simple transmitter, a beginner or casual amateur could have a harder time tracing a problem due to a poor solder connection. Therefore, PLEASE take us seriously when we say that good soldering is essential to the proper operation of your receiver! ?Use a 25-watt soldering pencil with a clean,

20、 sharp tip. ?Use only rosin-core solder intended for electronics use. ?Use bright lighting. A magnifying lamp or bench-style magnifier may be helpful. ?Do your work in stages, taking breaks to check your work. ?Carefully brush away wire cuttings so they dont lodge between solder connections. FR10 CI

21、RCUIT DESCRIPTION VHF signals from the antenna are amplified through the tuned input circuit (L1,C3 and L2,C4) by Q1, a microwave bipolar transistor. Q1s output is fed to the input of the SA602 IC, an efficient single-package (8- pin DIP) mixer-product detector-oscillator. The tunable oscillator sec

22、tion of the SA602 is aligned to operate at 10.7 MHz higher than the signal fed and amplified by Q1. For example, to receive 222-227 MHz signals, the oscillator must tune 232.7 to 237.7 MHz in order for the SA602s mixing capability to produce a steady 10.7 MHz output signal to the rest of the circuit

23、. The oscillator frequency is determined by L3 and its associated capacitors, and varied by the varactor tuning network using D1 and varied by R1. The output from pin 4 of the SA602 passes through a ceramic 10.7 MHz filter, amplified by transistor Q2 and applied to input pin 18 of U2. Q3 provides AF

24、C (automatic frequency control) by keeping the local FR-10 6 oscillator of U1 from drifting away from an incoming signal. This is accomplished by tuning the varactor circuit in the direction opposite the drift. The MC3359 IC has an internal oscillator controlled by the 10.24 MHz crystal. The 10.24 M

25、Hz signal is mixed with the 10.7 MHz input from U1 to convert down to the low IF of 450 KHz. The 450 KHz IF is filtered by FL2 and then amplified by a limiting amplifier in U2. Audio demodulation takes place in the quadrature detector, with L4 adjusting the detector. The audio modulation is detected

26、 in U2, and the background noise is used to control the squelch. U3 amplifies the audio output from pin 10 of U2 to a practical level for speaker or headphone operation. Pin 16 of U2 will ground the input of U3 when the squelch is closed. L4, a 450 KHz IF coil, permits adjustment of the 90-degree vo

27、ltage- current phasing (quadrature) of FL2s output to the FM detector demodulator (pin 8 of the MC3359). PARTS LIST Inductors ?2 .33 uH inductors looks like a resistor with 2 orange and 2 silver bands (L1,L2) ?1 slug-tuned coil blue color (L3) ?1 shielded transformer coil marked LB 53303 (L4) Semico

28、nductors and ICs ?1 2SC2498 or 2SC2570A transistor (Q1) ?3 2N3904 transistor (Q2,Q3,Q4) ?1 SA602 8-pin IC (U1) ?1 MC3359 18-pin FM receiver IC (U2) ?1 LM386 8-pin audio amplifier IC (U3) ?1 Varactor diode, MV2209 looks like a transistor with two leads (D1) ?1 1N4148 signal diode (D2) Special Compone

29、nts ?1 10.24 MHz Crystal (Y1) ?1 10.7 MHz ceramic filter brown, molded, 3 leads (FL1) ?1 450 KHz ceramic filter black, square (FL2) FR-10 7 Fixed Resistors ?1 2 ohm red-black-gold (R22) ?3 270 ohm red-violet-brown (R6,9,20) ?1 470 ohm yellow-violet-brown (R5) ?2 1K ohm brown-black-red (R11,12) ?3 10

30、K ohm brown-black-orange (R7,17,19) ?1 18K ohm brown-gray-orange (R18) ?1 33K ohm orange-orange-orange (R14) ?4 47K ohm yellow-violet-orange (R4,8,13,21) ?1 100K ohm brown-black-yellow (R16) ?1 470K ohm yellow-violet-yellow (R15) ?1 1 megohm brown-black-green (R10) Capacitors ?1 10 pF (C5) ?2 22 pF

31、(C2,19) ?1 47 pF (C12) ?2 56 pF (C3,4) ?5 100 pF marked 100, 101, or 101K (C1,6,9,10,22) ?1 220 pF marked 220 or 221 (C18) ?6 .001 uF marked .001 or 102 or 1 nF (C7,8,20,23,24,25) ?9 .01 uF marked .01 or 103 or 10 nF (C11,13,16,17,21,26,28,29,31) ?1 .1 uF marked .1 or 104 (C34) ?1 1.0 uF electrolyti

32、c (C27) ?3 4.7 or 10 uF electrolytic (C15,30,36) ?4 100 to 220 uF electrolytic (C14,32,33,35) Controls and Hardware ?1 Printed circuit board ?3 10K ohm potentiometer (R1,R2,R3) ?1 DPDT push switch (S1) ?1 PC mount RCA jack (J1) ?1 PC mount subminiature speaker jack (J2) ?1 9-volt battery bracket ?1

33、9-volt battery snap-on clip REQUIRED, NOT SUPPLIED ?1 9-volt alkaline battery ?1 VHF antenna with cable terminated in RCA-style plug or adapter ?1 Speaker or headphones FR-10 8 U2, 3359 FR-10 BLOCK DIAGRAM U1 SA602 MIXER FR-10 9 FR-10 PARTS LAYOUT DIAGRAM FR-10 10 NOTE CONCERNING THE AUDIO OUTPUT JA

34、CK Your receiver kit is supplied with a standard subminiature 2.5 mm (3/32”) audio jack, which mates with commonly available earphone plugs and adapters available at Radio Shack, such as 274-290 (plug) or 274-327 (adapter for 1/8” mono plug). If you prefer to use another size and style jack, we sugg

35、est that you still install the original jack and then wire your own jack in parallel with it rather than rough up the PC board to accommodate your jack. SEMICONDUCTOR REPLACEMENT DATA U1 SA602 Contact Ramsey Factory U2 MC3359 (Motorola) ECG860 or SK7731 U3 LM386 (National) available at Radio Shack,

36、other suppliers Q1 2SC2498 or 2570 ECG10 or SK9139 Q2,3 2N3904 available at Radio Shack, other suppliers D1 BB405 contact Ramsey Factory D2 1N4148 available at Radio Shack, other suppliers FR-10 11 RAMSEY “Learn-As-You-Build” KIT ASSEMBLY: We have a twofold strategy for the order of the following ki

37、t assembly steps. First, we install parts in physical relationship to each other, so theres minimal chance of inserting wires into wrong holes. Second, whenever possible, we install in an order that fits our Learn-As-You Build Kit building philosophy. FOR EACH PART, OUR WORD INSTALL ALWAYS MEANS THE

38、SE STEPS: 1. Pick the CORRECT part value to start with. 2. Insert it into the CORRECT PC board location. 3. ORIENT it correctly, which means: PLEASE follow the PC board drawing and the written directions for ALL parts where theres a right way AND a wrong way to solder it in. (Diode bands, electrolyt

39、ic capacitor polarity, transistor shapes, dotted or notched ends of ICs, and so forth.) 4. Solder ALL connections unless directed otherwise. Use enough heat and solder flow for clean, shiny, completed connections. Dont be afraid of ANY pen-style soldering iron having enough heat to damage a componen

40、t. 5. Trim or nip excess wire lengths after soldering. NOTE: Save some of the longer wire scraps nipped from resistors and capacitors. These will be used to form wire jumpers (JMP1, etc.) to be soldered in just like parts during these construction steps. Now, lets start building! ?1. Press S1 firmly

41、 into its six holes and solder all six pins. The switch fits the board only one way. Ignore the other set of six solder connectors on the switch. ?2. Install J1, the RCA-style antenna jack. Solder all 4 points. ?3. Install J2, the subminiature phone jack. Solder all three points. Be gentle and patie

42、nt in inserting, so as not to damage the solder tabs. ?4. Install controls R1, R2 and R3. Insert the three PC mounted controls into their positions. Check that the controls are pressed in firmly and straight against the top of the board. Solder the FR-10 12 three center pins and then the two larger

43、mechanical mounting tabs. Use enough solder for a solid connection. Also, if you plan to use an enclosure other than the custom Ramsey enclosure and knob kit, you may wish to locate the controls differently than provided by the PC board. In this case, the control lugs are wired to the PC board using

44、 your own insulated hookup wire, kept as short as possible for neat installation. FURTHER COMPONENT INSTALLATION All directions on the PC board (i.e.: right, left, above, below and so forth) assume orientation of your board as shown in the parts layout diagram. Therefore the rear of the board (conne

45、ctors) is the lower end, and the front (controls) is the upper end. 1. ANTENNA INPUT AND TUNED RF PREAMPLIFIER 5. Install C1, 100 pf disc capacitor marked 100 or 101. 6. Install C2, 22 pf. 7. Install C3, 56 pf. 8. Install L1, .33 uH inductor. L1 resembles a resistor body with two orange stripes pain

46、ted on it. 9. Install C4, 56 pf. 10. Install L2, the other .33 uH coil just like L1 above. 11. Install C5, 10 pf. 12. Clearly identify Q1, the 2SC2498 or 2SC2570A transistor. Do not confuse it with the other transistors supplied. Position Q1 as shown on the PC board layout, with the flat side facing

47、 to the right, toward the middle of the board. Press the transistor snugly into the PC board so that only a minimum amount of wire lead is exposed above the board. When soldering, dont be afraid to use enough heat to make good clean connections. 13. Install R4, 47K, just to the left of Q1. yellow-violet-orange. 14. Install C6, 100 pf marked 100 or 101. 15. Install R5, 470 ohms yellow-violet-brown. FR-10 13 2