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Ramsey Electronics FR6 manual

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  • Page 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-cl ear 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 any 5 MHz por tion of the 40 to 6 0 MHz band. [...]

  • Page 2

    FR6 • 2 RA M SEY TRA NSMIT TER KI TS · FM100B Professional FM Ster eo Transmitter · FM25B Synthesized Stere o Transmitter ·  A M1, A M25 AM Transm itters · TV6 Television Transmi tter RAMSE Y RECEI VER KI TS · FR1 FM Broadcast Receiver · A R1 Airc raft Band Rec eiver · SR2 Shortwave Receiver · A A7 A ctiv e A ntenna · SC1 Shortwave Co[...]

  • Page 3

    FR6 • 3 FR6 6 METER FM RECEIVER KIT Ramsey Publication No. MFR6 Price $5.00 TABLE OF CONTENTS I ntroductio n to the FR6 .................. 4 Circuit Descr iption ......................... 5 Part s List ....................... ................. 6 Simplifie d Block Diagram .............. 8 Parts Lay out Diagram ................ .... 9 Schematic Dia[...]

  • Page 4

    FR6 • 4 INTR ODU C TION FM and repeaters on 6 mete rs? You bet ! There's no t a lot to sa y about u sing the FR6 r eceiv er once its be en correctly built and aligne d. If 6 m eters is "dead” , it resem bles the usual 2 m eter action . If 6 meters is "hot", you ’ll find an amazing variety of cry stal-clear FM signals from [...]

  • Page 5

    FR6 • 5 BUILDING Y OUR FR6 KIT There are just over 200 solder connecti ons on the FR6 printed circuit board. That means your w ork could be 99% excellent and you could STIL L have 2 or 3 cold solder points or solder bridges. Since this circuit is more sophisticated than a direct-conversion HF re ceiver or a simple transmitter, a beginner or casu [...]

  • Page 6

    FR6 • 6 practical level for speaker or headphone oper ation. Pin 16 of U2 will ground the input of U3 w hen the s quelch is closed. L4, a 450 KHz IF coil, permits adjustment of the 90-degree voltage-curren t phasing ("quadra ture") of FL2's output to the FM detector demodulator (p in 8 of the MC3359). PA RTS LI ST Inductors  2 .[...]

  • Page 7

    FR6 • 7  4 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 [mark ed .01 o r 103 or 10 nF] (C13,16, 17,21, 26,28,29,3 1)  1 .1 uF [marked .1 or 104] (C34)  1 1.0 uF electrolytic (C27)  3 4.7 or 10 uF[...]

  • Page 8

    FR6 • 8 U2, 3359 FR6 BLOCK DIAG RAM[...]

  • Page 9

    FR6 • 9 FR6 PARTS LAYOUT DI A GR A M[...]

  • Page 10

    FR6 • 10[...]

  • Page 11

    FR6 • 11 RAMSEY “Learn-As-You-Build” KIT ASSEMBL Y: W e have a tw ofold "strategy" for the order of the follow ing k it assembly steps. First, we install parts in physical relati onship to each ot her, so there 's mini mal chance of inserting w ires into wrong holes. Second, w henever possible, we install in an order that fits [...]

  • Page 12

    FR6 • 12 the PC board. In this case, the contro l lugs are wired to the PC board using your own insulated hookup wire, kept as short as possible for neat installation. All "directions" on the PC board (ie: ri ght, left, above, below and so forth) assum e orientati on of your board as sh own in the parts la yout diagram. Therefore the re[...]

  • Page 13

    FR6 • 13 improper socket insertion tha n f rom solder ing heat damage to IC's. Even if this is your first IC, don't be afraid to use enough heat to make 8 clean connection s, but DO b e sure to correctl y orient the en d mark ed by a band, dot, or notch. Bef ore solderin g, make sure that the IC or socket is perfectly flat against the t[...]

  • Page 14

    FR6 • 14 ❒ 37. Install jumper JMP1. ❒ 38. Install jumper JMP3. PROGRESS SUMMARY So far, you have wi red the tuned input from the antenna, the RF preamplifier, and the SA602 mixer- oscillator, including the vara ctor tuning circuit. The work you have done so far has actually formed a simple receiver capable of tuning in VHF signals of all kind[...]

  • Page 15

    FR6 • 15 ❒ 50. Ins tall C28, .01 uF [marked .01, 103, or 1 0 nF]. ❒ 51. Install R19, 10 K ohm s [brow n-black-orange] ❒ 52. Install ju m per w ire, JMP2. ❒ 53. Install C34, .1 uF [marked .1 or 104]. ❒ 54. Install R2 1, 47K ohms [yello w-violet-orange]. ❒ 55. Install C35, 100 to 220 uF electrolytic, observe polarity. ❒ 56. Install R2[...]

  • Page 16

    FR6 • 16 ❒ 70. Install C19, 22 pF. ❒ 71. Install Y1, the 10.24 MHz. crystal. No special procedure is required. Simply press the crystal firmly into it s holes as far as it will go, and make good solder connections. ❒ 72. Install FL2, the 450 KHz filter. Its three leads are delicate and fit in only one way . ❒ 73. Install C23, .001 uF [mar[...]

  • Page 17

    FR6 • 17 ❒ 83. Install the battery sn ap term inal in the tw o holes b elow S1, making sure that the positive (red) lead is inserted into th e (+) hole on the PC board. ❒ 84. The battery bracket may be attached in a vari ety of w a ys. A wire jumper can be passed through the tw o holes on the PC board, then both ends soldered on the underside[...]

  • Page 18

    FR6 • 18 TESTING, ALIGNMENT AND ADJUSTMENT To prepare the FR6 FM VHF Receiver for reliable monitoring operation, y o u will need these basic tools:  1. A useful 6 meter signal source.  2. Hexagonal, non-me tallic coil slug alignment tool f or L3.  3. Small screwdriver to adjust L4. 1. Signal source: T his signal ca n be fr om your tes t [...]

  • Page 19

    FR6 • 19  7. Turn the power ON.  8. Turn R2 (Volume control) until you he ar some noise.  9. Adjust L4 for maximum noise in the speaker. Further alignment now consists of adjusti ng the oscillator coil L3 to permit the tuning control (R3) to co ver the 5 MHz. segment betw een 50 and 54 MHz of primary interest to you. Assuming you wish to[...]

  • Page 20

    FR6 • 20 Study the PC traces between the positi ve battery supply wire and the on-off switch. The unused connectors on top of you r switch are an ideal point to get the + DC voltage needed for the anode (longer lead) of the LED. Plan where and how you wish to install the LED in your enclosure. Locating the LED im mediately above the on- off sw i [...]

  • Page 21

    FR6 • 21 suited for Ramsey amateur kit boards is Radio Shack No. 270-253A. This metal utility cabinet can a ccommodate both a receiver and transm itter board, plus speaker, with ro om for various refinements you might like to add. FR6 TROUBLESHOOTING GUI DE The Ramsey FR-series FM receivers are among our most w idely-used an d popular kits. The c[...]

  • Page 22

    FR6 • 22 SOME NOTES FOR ADV A N CED USERS Unlike Ramsey HF receivers and transm itters, the FR-serie s of VHF receivers do not offer much PC board space or real need for customization or other modifications. These receivers d o what they a r e intended to do at the lowest price that we are aware of for a tuneable VHF FM receiver with squelch, AF [...]

  • Page 23

    FR6 • 23 The Ramsey K i t Warranty Pleas e read careful ly BEFO RE call ing or writ ing in about your k it. Mo st prob lems can b e so lved w ithou t co ntacti ng th e fa ctory. Notice that thi s is not a "fine print" warranty . We want you to und erstand your rights a nd ours too ! All Ramsey kits w ill work if assembl ed properly. The[...]

  • Page 24

    R6 • 24 FR6 6 Mete r FM Recei ver Kit Quick Reference Page Guide Introduction to the FR6 ......... ............ 4 Circuit Description ........... ................ .. 5 Parts List ........ ................. ................ .. 6 Simplified Bl ock Diagram ............. ..... 8 Parts Layout Diagram ....................... 9 FR6 Assembly Instructions[...]