Ramsey_FR-6_user.pdf

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1、 6 METER FM RECEIVER KIT Ramsey Electronics Model No. FR6 Check out the 6 meter action with this simple and fun to build FM receiver. Receive crystal-clear signals from thousands of miles away! Six meters is a fascinating band! Tune the entire 6 Meter band or the VHF low Police and Fire band. Tunes

2、any 5 MHz portion of the 40 to 60 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 receiver

3、 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 instructions carefully guide you to a finished kit that works the FIR

4、ST time! FR6 2 RAMSEY TRANSMITTER KITS FM100B Professional FM Stereo Transmitter 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

5、 Converter RAMSEY HOBBY KITS SG7 Personal Speed Radar SS70A Speech Scrambler SP1 Speakerphone WCT20 Wizard Cable Tracer ECG1 Heart Monitor LABC1 Lead Acid Battery Charger IG7 Ion Generator CT255 Compu Temp Digital Binary Thermometer LC1 Inductance-Capacitance Meter RAMSEY AMATEUR RADIO KITS HR Serie

6、s HF All Mode Receivers QRP Series HF CW Transmitters DDF1 Doppler Direction Finder CPO3 Code Practice Oscillator 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

7、 catalog. FR-10 10 METER FM RECEIVER KIT INSTRUCTION MANUAL Ramsey Electronics publication NO. MFR6 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

8、duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America. FR6 3 FR6 6 METER FM RECEIVER KIT Ramsey Publication No. MFR6 Price $5.00 TABLE OF CONTENTS Introduction to the FR6 . 4 Circuit Description . 5 Parts List . 6 Simplified Block Diagram . 8 P

9、arts Layout Diagram . 9 Schematic Diagram . 10 FR6 Assembly Instructions . 11 Testing and Alignment . 18 Enclosure Ideas . 20 Troubleshooting Guide . 21 Notes for Advanced Users . 22 Ramsey Kit Warranty . 23 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR FR6 4 INTRODUCTION FM and repeaters on 6 meters? You

10、 bet! Theres not a lot to say about using the FR6 receiver once its been correctly built and aligned. If 6 meters is dead”, it resembles the usual 2 meter action. If 6 meters is hot, youll find an amazing variety of crystal-clear FM signals from many thousands of miles away! If there are local 6 met

11、er repeaters in your area, the FR6 will be just as active as the local repeater gang. Since the FR6 “hears” only FM, the various SSB and CW signals on the band will not be properly demodulated as to be intelligible. This receiver is a good project for amateurs wishing to become more familiar with 6

12、meter FM before choosing a transceiver, or for those active on 6 who want an inexpensive receiver to take on trips, keep in a briefcase or to watch for band openings. Most Ramsey Electronic Kits can be classified as Skill Level 1 if we use the old Heathkit guidelines for ease of assembly. That means

13、 that our kits are intended to be successful for first-time kit builders. This FR6 FM Receiver is best regarded as a Skill Level 2 project, (or least Level 1.46!) and should not be taken lightly, even by experienced, licensed radio amateurs. Still, this step-by-step manual is written with the beginn

14、er in mind, because we are well aware of the fascination that Six 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 FR6, but we are confident that you can construct the FR6 successfully if you follow this manual carefully and patiently. Before beginning the project or

16、 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 diodes. And, in addition to four induct

17、ors, a 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 circuit board. FR6

18、5 BUILDING YOUR FR6 KIT There are just over 200 solder connections on the FR6 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 receiver or a si

19、mple 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, sharp ti

20、p. ?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. FR6 CIRCUIT DESC

21、RIPTION 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 tuneable oscillator section of t

22、he SA602 is aligned to operate at 10.7 MHz higher than the signal fed and amplified by Q1. For example, to receive 50-54 MHz signals, the oscillator must tune 60.7 to 64.7 MHz in order for the SA602s mixing capability to produce a steady 10.7 MHz output signal to the rest of the circuit. The oscilla

23、tor 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 AFC (Automatic

24、Frequency Control) by keeping the local 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 MHz signal is mixed wi

25、th 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 in U2, and the backg

26、round noise is used to control the squelch. U3 amplifies the audio output from pin 10 of U2 to a FR6 6 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 voltage-current p

27、hasing (quadrature) of FL2s output to the FM detector demodulator (pin 8 of the MC3359). PARTS LIST Inductors ?2 .15 uH inductors looks like a resistor with brown-green-silver bands (L1,L2) ?1 slug-tuned turn coil blue color (L3) ?1 shielded transformer coil marked LB 53303 (L4) Semiconductors and I

28、Cs ?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, BB505 orange body marked BB505 (D1) ?1 1N4148 signal diode (D2) Special Components ?1 10.24 MHz Crystal (Y1)

29、 ?1 10.7 MHz ceramic filter brown, molded, 3 leads (FL1) ?1 450 KHz ceramic filter black, square (FL2) 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 10K ohm brown-black-orange (R7,17,19) ?

30、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 4.7 or 5 pF (C2) ?2 10 pF (C1,5) ?1 22 pF (C19) FR6 7 ?4

31、62 pF (C3,4,9,10) ?4 100 pF marked 100, 101, or 101K (C6,11,12,22) ?1 220 pF marked 220 or 221 (C18) ?6 .001 uF marked .001 or 102 or 1 nF (C7,8,20,23,24,25) ?8 .01 uF marked .01 or 103 or 10 nF (C13,16,17,21,26,28,29,31) ?1 .1 uF marked .1 or 104 (C34) ?1 1.0 uF electrolytic (C27) ?3 4.7 or 10 uF e

32、lectrolytic (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 9-volt battery snap-on cl

33、ip REQUIRED, NOT SUPPLIED ?1 9-volt alkaline battery ?1 VHF antenna with cable terminated in RCA-style plug or adapter ?1 Speaker or headphones NOTE CONCERNING THE AUDIO OUTPUT JACK Your receiver kit is supplied with a standard subminiature 2.5 mm (3/32) audio output jack, which mates with commonly

34、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 suggest that you still install the original jack and then wire your own jack in parallel with it rather to rough up the

35、PC board to accommodate your jack. FR6 8 U2, 3359 FR6 BLOCK DIAGRAM FR6 9 FR6 PARTS LAYOUT DIAGRAM FR6 10 FR6 11 RAMSEY “Learn-As-You-Build” KIT ASSEMBLY: We have a twofold strategy for the order of the following kit assembly steps. First, we install parts in physical relationship to each other, so

36、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 THESE STEPS: 1.Pick the CORRECT part value to start with. 2.Insert it into the CORRECT P

37、C 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, electrolytic capacitor polarity, transistor shapes, dotted or notched ends of ICs, and so forth.)

38、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 component. 5.Trim or nip excess wire lengths after soldering. NOTE: Save some of the longer wire

39、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 into its six holes and solder all six pins. The switch fits the board only one way. Ignor

40、e 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 patient in inserting, so as not to damage the solder tabs. ?4. Install controls R1, R2 and R3.

41、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 three center pins and then the two larger mechanical mounting tabs. Use enough solder for a solid connection. Also, if you plan to use an enc

42、losure other than the custom Ramsey enclosure and knob kit, you may wish to locate the controls differently than provided by FR6 12 the PC board. In this case, the control lugs are wired to the PC board using your own insulated hookup wire, kept as short as possible for neat installation. All direct

43、ions on the PC board (ie: 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 (connectors) is the lower end, and the front (controls) is the upper end. 1. ANTENNA INPUT AND TUNED RF PREAMPLIFIER 5. Install C1,

44、 10 pF disc capacitor. 6. Install C2, 4.7 or 5 pF. 7. Install C3, 62 pF. 8. Install L1, .15 uH inductor looks like a resistor with a green colored body with brown, green, and silver bands. 9. Install C4, 62 pF. 10. Install L2, just like L1 above. 11. Install C5, 10 pF. 12. Clearly identify Q1, the 2

45、SC2498 or 2SC2570A transistor. Do not confuse it with the other transistors supplied. 13. Position Q1 as shown on the PC board layout, with the flat side facing 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 e

46、xposed above the board. In soldering, dont be afraid to use enough heat to make good clean connections. 14. Install R4, 47K. yellow-violet-orange just to the left of Q1. 15. Install C6, 100 pF marked 100, 101, or 101K. 16. Install R5, 470 ohms yellow-violet-brown. 2. SA602 OSCILLATOR-MIXER and VARAC

47、TOR TUNING 17. Install R6, 270 ohms red-violet-brown. 18. Install C7, a .001 uF bypass capacitor marked .001, 102, or 1 nF. In installing the SA602 IC, you may wish to use an 8-pin DIP socket rather than soldering the IC directly to the board. Reasons for doing this might include the peace of mind of beginners afraid of damaging the IC, or experienced builders testing the merits of the SA602s cousin, the SE602. However, please be aware that we have seen more service problems with FR6 13 improper socket insertion than from sol