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10 METER FM
Ramsey Electronics Model No.
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.
•
Tunes 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 receiver 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 FIRST time!
RECEIVER KIT
FR10
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Summary of Contents for Ramsey Electronics FR10
- Page 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.
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Page 2: Fr10 10 Meter Fm Receiver Kit
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 Ramsey Electronics, Inc. -
Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR FR10 10 METER FM RECEIVER KIT TABLE OF CONTENTS ntroduction to the FR10 ....4 Circuit Description ......5 Parts List ........6 Simplified Block Diagram ....8 Parts Layout Diagram ....9 FR10 Assembly Instructions ..11 Schematic Diagram ....... -
Page 4: I Ntroduction To The Fr10
INTRODUCTION There's not a lot to say about using the FR10 receiver once its been correctly built and aligned. If 10 meters is "dead" you'll hear little or nothing. If Ten is "open" there will be an amazing variety of crystal- clear signals from many thousands of miles away. -
Page 5: Circuit Description
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... -
Page 6: Parts List
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 with the 10.7 MHz input from U1 to convert down to the low IF of 450 KHz. - Page 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 10K 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)
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Page 8: Simplified Block Diagram
FR-10 BLOCK DIAGRAM SA602 MIXER U2, 3359 FR-10 • 8... -
Page 9: Fr-10 Parts Layout Diagram
FR-10 PARTS LAYOUT DIAGRAM FR-10 • 9... - Page 10 NOTE CONCERNING THE AUDIO OUTPUT JACK 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 suggest 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.
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Page 11: Fr10 Assembly Instructions
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 there's minimal chance of inserting wires into wrong holes. Second, whenever possible, we install in an order that fits our "Learn-As-You Build"... - Page 12 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 enclosure other than the custom Ramsey enclosure and knob kit, you may wish to locate the controls differently than provided by the PC board.
- Page 13 2. SA602 OSCILLATOR-MIXER and VARACTOR TUNING 16. Install R6, 270 ohms. [red-violet-brown] 17. 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 SA602's cousin, the SE602.
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Page 14: Schematic Diagram
FR-10 • 14... - Page 15 FR-10 • 15...
- Page 16 28. Install varactor diode D1.It looks like a transistor with just two leads. The flat side faces L3 so be sure to orient it correctly. 29. Install R8, 47K ohms [yellow-violet-orange]. 30. Install R9, 270 ohms [red-violet-brown]. 31. Install C13, .01 uf [marked .01 or 103 or 10nf]. 32.
- Page 17 3. TRANSISTOR COUPLING & AFC CIRCUITS, VOLUME & SQUELCH CONTROLS 37. Install Q2, a 2N3904 transistor. Observe correct positioning of the flat side. 38. Install R13, 47K ohms [yellow-violet-orange]. 39. Install C20, .001 uf [marked .001 or 102]. 40. Install R12, 1K ohms [brown-black-red]. 41.
- Page 18 58. Install C24, .001 uf [marked .001 or 102]. 59. Install C25, .001 uf [marked .001 or 102]. 60. Install C26, .01 uf [marked .01 or 103 or 10nf]. 61. Install L4, the 450 KHz quadrature coil, soldering the two pins and the two mounting tabs.
- Page 19 75. Install R15, 470K ohms [yellow-violet-yellow]. 5. FINAL CONNECTIONS: THE LM386 AUDIO IC STAGE You now have a working FM receiver ready for adjustment. The output of the MC3359 FM IC simply needs to be boosted to listening level. A few more connections, and your receiver will be ready for adjustment and testing! Now would be a good time to review some of your previous work and also to make sure you have on hand what you'll need for testing:...
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Page 20: Testing And Alignment
TESTING, ALIGNMENT AND ADJUSTMENT To prepare the FR10 FM VHF Receiver for reliable monitoring operation, you will need these basic tools: 1. A useful 10 meter signal source. 2. Hexagonal, non-metallic coil slug alignment tool for L3. 3. Small screwdriver to adjust L4. - Page 21 If you are a beginner with no license or other equipment, any Ham operator with a 10-meter transceiver should be willing to give you the test signal and extra help that you need. The FR10 is very sensitive, so operate the transceiver on low power on a simplex frequency from a distance of at least across the room.
- Page 22 RECEIVER SENSITIVITY Your FM receiver features sensitivity under 1 uv. Radio Hams constantly marvel at how an FR10 displayed at hamfests tunes in dozens of hand- held QSO's on the premises without an antenna connected! You can expect to monitor local repeater and simplex transmissions easily, using a simple groundplane style antenna.
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Page 23: Enclosure Ideas
(2) We thought you'd have more fun planning and installing your own lamp that glows in the dark! (3) We could not decide which color you would like best! THE RAMSEY ELECTRONICS CASE, KNOB & HARDWARE OPTION Your finished receiver can be installed in a variety of enclosures of your own design and choosing. -
Page 24: Troubleshooting Guide
FR10 TROUBLESHOOTING GUIDE The Ramsey FR-series FM receivers are among our most widely-used and popular kits. The circuit itself, assembly and use are "cut-and-dried." If your receiver does not work, there is probably either an error in assembly or a defective part. Following is some help in case you experience difficulty. -
Page 25: Notes For Advanced Users
SOME NOTES FOR ADVANCED USERS Unlike Ramsey HF receivers and transmitters, the FR-series of VHF receivers do not offer much PC board space or real need for customization or other modifications. These receivers do what they are intended to do at the lowest price that we are aware of for a tunable VHF FM receiver with squelch, AFC and generous audio output. - Page 26 Again, please be sure that you understand your warranty, and that you understand your receiver and how to keep it working, before attempting any modifications. If you've enjoyed this kit, be sure to check out the entire Ramsey kit line. We have a whole series of nifty synthesized VHF FM Transceiver kits that not only teach state-of-the-art technology, but are fun and easy to build, too! Call or write for our catalog.
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Page 27: Ramsey Kit Warranty
'1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as... - Page 28 • Holder for PC Board/Parts Ramsey HH3 • Desoldering Braid Ramsey RTS08 • Digital Multimeter Ramsey M133 Price: $5.00 Ramsey Publication No. FR10 Assembly and Instruction manual for: RAMSEY MODEL NO. FR10 10 METER FM RECEIVER KIT FR-10 • 28...