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2 METER FM
Ramsey Electronics Model No.
Keep an ear on the local repeater action from your easy chair
with this simple and fun to build FM receiver. Tune the entire 2
Meter band or the VHF high Police and Fire band.
•
Tunes any 5 MHz portion of the 136 to 175 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 weather band, police, fire, etc.
•
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
FR146
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Summary of Contents for Ramsey Electronics FR146
- Page 1 2 METER FM RECEIVER KIT Ramsey Electronics Model No. FR146 Keep an ear on the local repeater action from your easy chair with this simple and fun to build FM receiver. Tune the entire 2 Meter band or the VHF high Police and Fire band.
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Page 2: Fr146 2 Meter Fm Receiver Kit
Ramsey Electronics publication NO. MFR146 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 FR146 2 METER FM RECEIVER KIT TABLE OF CONTENTS ntroduction to the FR146 ....4 Circuit Description ......5 Parts List ........6 Simplified Block Diagram ....8 Parts Layout Diagram ....9 FR146 Assembly Instructions ..10 Schematic Diagram ....... -
Page 4: I Ntroduction To The Fr146
Most Ramsey kits can be classified as “Skill Level 1”. That means that our kits are intended to be sucessful for first-time kit builders. This FR146 FM Receiver is best regarded as a “Skill Level 2” project (or at least Level 1.46!) and should not be taken lightly, even by experienced, licensed radio amateurs. -
Page 5: Circuit Description
Carefully brush away wire cuttings so they don't lodge between solder connections. FR146 CIRCUIT DESCRIPTION VHF signals from the antenna are amplified through the tuned input circuit (L1, C3 and L2,C4) by Q1, a microwave bipolar transistor. Q1's output is fed to the input of the SA602 IC, an efficient single-package (8-pin DIP) mixer-product detector-oscillator. -
Page 6: Parts List
220 pF [marked 220 or 221] (C18) .001 uF [marked .001 or 102 or 1 nF] (C7,8,11,20,23,24,25) .01 uF [marked .01 or 103 or 10 nF] (C13,16,17,21,26,28,29,31) .1 uF [marked .1 or 104] (C34) 1.0 uF electrolytic (C27) FR146 • 6... - Page 7 ECG860 or SK7731 U3 LM386 (National) available at Radio Shack, other suppliers Q1 2SC2498 ECG10 or SK9139 Q2,3 2N3904 available at Radio Shack, other suppliers D1 BB505 contact Ramsey Factory D2 1N4148 available at Radio Shack, other suppliers FR146 • 7...
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Page 8: Simplified Block Diagram
FR146 BLOCK DIAGRAM SA602 MIXER U2, 3359 FR146 • 8... -
Page 9: Parts Layout Diagram
FR146 PARTS LAYOUT DIAGRAM FR146 • 9... -
Page 10: Fr146 Assembly Instructions
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. FR146 • 10... - Page 11 IC's. Even if this is your first IC, don't be afraid to use enough heat to make 8 clean connections, but DO be sure to correctly orient the end marked by a band, FR146 • 11...
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Page 12: Schematic Diagram
FR146 • 12... - Page 13 FR146 • 13...
- Page 14 The value of C14 is not critical and may be any value from 100 to 220uF. 32. Install C14, 100 to 220 uF, observing correct polarity. 33. Install C15, 4.7 or 10 uF, observing correct polarity. 34. Install jumper JMP1. 35. Install jumper JMP3. FR146 • 14...
- Page 15 50. Install C34, .1 uf (marked .1 or 104). 51. Install R21, 47K ohms (yellow-violet-orange). 52. Install C35, 100 to 220 uf electrolytic, observe polarity. 53. Install R20, 270 ohms (red violet-brown). 54. Install Q4, 2N3904 transistor. FR146 • 15...
- Page 16 71. Install C27, 1 uF electrolytic, observe correct polarity. 72. Install D2, the 1N4148 signal diode, observe correct orientation of the banded cathode end. Be sure you correctly identified D2 and did not confuse it with the varactor diode already installed. FR146 • 16...
- Page 17 Brush the solder side of the board with a stiff brush to make sure that no loose wire trimmings or solder drippings (tsk tsk) are lodged between connections. FR146 • 17...
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Page 18: Testing And Alignment
135-175 MHz of primary interest to you, and still wish to verify immediately the proper operation of your FR146, a good and steady VHF signal source will be your local NOAA Weather Service station, broadcasting around 160 MHz. Once you have verified reliable reception of your regional NOAA station, adjustment to your desired listening range will become easier. - Page 19 2-meter transceiver should be willing to give you the test signal and extra help that you need. The FR146 is very sensitive, so operate the transceiver on low power on a simplex frequency from a distance of at least across the room. An 8"...
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Page 20: 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 21: Troubleshooting Guide
FR146 TROUBLESHOOTING HINTS 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. - Page 22 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. FR146 • 22...
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Page 23: Ramsey Kit Warranty
'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 supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase 3. - Page 24 • Holder for PC Board/Parts Ramsey HH3 • Desoldering Braid Ramsey RTS08 • Digital Multimeter Ramsey M133 Price: $5.00 Ramsey Publication No. FR-146 Assembly and Instruction manual for: RAMSEY MODEL NO. FR146 2 METER FM RECEIVER KIT R146 • 24...