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Bedienungsanleitung Ramsey Electronics FM10A

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  • Ramsey Electronics FM10A - page 1

    FM STEREO TRANSMITTER Ramsey Electronics Model No. FM10A • Great for transmitting your tape deck or CD play er throughout the house, yard or even your car. • Powerful enough for college or neighborhood ra dio stations - in use all ov er the w orld. • Fantastic audio quality sounds better than most stations on the dial. And w e’ll tell y ou ...

  • Ramsey Electronics FM10A - page 2

    P ARTIAL LIST OF AVAIL ABLE KI TS RA MSEY TRA NSM ITT ER KITS • FM25, M P3FM FM Stereo Transmitters • AM1 A M Transmitter • TV6 T elevision Transm itter • FM100 Professional FM Ster eo Tran smitte r RAMSE Y RECEI VER KI TS • FR1 FM Br oa dca st Re cei ver • AR1 A ircraft Band Receiver • SR2 Shortwave Receiver • AA7 A cti ve Antenna ...

  • Ramsey Electronics FM10A - page 3

    FM10A FM STEREO TRANSMITTER Ramsey Pu blication No. MFM10A Manual Price Only: $5.00 TABLE O F CONTENTS Introd uction to the FM10A ........ ............. ............ ...... 4 FM10A Circuit Descrip tion ........ ............... .............. .. 5 Sche matic Di agra m ........... ............. .............. ........... 5 Parts List .... ........... ...

  • Ramsey Electronics FM10A - page 4

    INTR ODU C TION The Ram sey FM10A is a true STER EO FM broadcast transmitter, w hich any person may bu ild an d use in accordance with the rules of y our nation’s telecomm unications au thority. For U.S. r esidents, that author ity is the Federal Communications Commission (FCC). The FM10A's lo w-powe r broadcasting ca pability and other prac ...

  • Ramsey Electronics FM10A - page 5

    CIRCUIT DESCRIPTION A quick glance at the Schematic Diagram show s that the custom FM stereo transmitter IC (U1) is at the hear t of the FM10A. The control of U1 is determined by its surrounding circuitr y . Potentiometers R1 and R4 allow for adjustment of input leve l. Resist ors R3 and R6 set the pre-emphasis characteristics (75uS for USA and 50u ...

  • Ramsey Electronics FM10A - page 6

    PA RTS LIST CAPACITORS  4 10 pf disc capacitor (marked 10 or 10K) (C7,8,14,15)  1 18 pf disc capacitor (marked 18) (C16, see note below )  1 22 pf disc capacitor (marked 22) (C16, see note below )  1 27 pf disc capacitor (marked 27) (C16, see note below ) NOTE: Selecti ng 18, 2 2 or 27 pf for C16, esta blishes the FM-band frequency adju ...

  • Ramsey Electronics FM10A - page 7

    REQUIRED, NOT SUPPLIED:  9-volt alkaline or heavy -dut y battery  Shielded stereo audio cables  Line-lev el output au dio sou rce (suc h as a tape deck or CD pla yer)  External antenna, small gauge coax and RCA plug, OR PC board mounted telescoping whip ante nna (included with the Ramsey CFM case and knob set. OPTIONAL  Ramsey FM10A ...

  • Ramsey Electronics FM10A - page 8

    ASSEMBLY INSTRUCTIONS Building your FM10A Stereo T ransmitter The following FM10A step-by -step assembly and adjustment directions are written with newcomers in mind. While many Ramsey kits are purchased by experienced hobby ists and ham radio o perators, our instructions presume that this st ereo trans mitter could b e your first ever ki t project ...

  • Ramsey Electronics FM10A - page 9

    • SOLDER ALL wires or pi ns of th e part, whether t he t wo wires of a resistor or the 18 pins of an IC socket. • Nip or "trim" all excess wires extending bey ond each solder connection, taking care that w ire trimm ings do not be come lodged in PC board solder conn ections. Enough said. . . Let's get building!  1. Install S1, ...

  • Ramsey Electronics FM10A - page 10

    Wiring the audio input circuits We encourage you to peek at the schematic diagram and learn the functions of the following parts. Howeve r, the sequence of installation is in the order of convenience and speed. If y ou wish, insert the parts groupings as one operation, then solder and nip all connections.  8. Install R1, one of the small yello w ...

  • Ramsey Electronics FM10A - page 11

     17. Install glass bead diode D1.  18. Install glass bead diode D2.  19. Install glass bead diode D3.  20. Install R7, the small yellow trimmer potentiome ter marked "104".  21. Install C19, the 470 µF electrolytic. Be sure to position for correct polarity .  22. Install C1 1, 4.7 to 10 µF electr olytic. Observe p olar ...

  • Ramsey Electronics FM10A - page 12

     35. Install R1 0, 10K ohm s [bro wn-black-orange]. The following t wo capacitors have the identical functions of coupling the RF output from the collector of Q1 to the RF output jack (J3) and also the mounting point provided if you wish to use an on-board whip a ntenna.  36. Install C13, .001 µF (marked .001 or 102 or 1 nf).  37. Install ...

  • Ramsey Electronics FM10A - page 13

    FM10A freque nc y range selection Capacitor C16 sets the frequency r ange of the FM10A. Values for C16 are as fo llo ws : Desired Transmitter Frequency Range C16 Value Lower end of FM band .......... (88-94 MHz) .... 27 pf Middle portion of FM band ... (91-100 MHz) ... 22 pf High end of FM band ........ ... (95-108 MHz) ... 18 pf If you are not sur ...

  • Ramsey Electronics FM10A - page 14

    ADJUS TIN G YOUR FM1 0 A TRANSMI TTE R Keep all tests very brief until y ou have carefully chosen an open operating frequency in the FM broadcast band. 1. Transmitting Frequency : After f inding a suitable "open" frequency in the 88-108 MHz FM ban d, adjust L1 with th e plastic alignm ent screwdrive r until you hear the carrier frequency ...

  • Ramsey Electronics FM10A - page 15

    USING THE FM10A WITHIN THE HOME A most practical use for the FM10A would be to c onnect it to the main stereo system within a la rge home so th at whatever is playing on the main system can also be tuned-in on portable FM ra dios in other rooms, the garage or out in the yard. This connection consists of using shielded audio cables to connect the au ...

  • Ramsey Electronics FM10A - page 16

    negative battery wire. The resistor is omitted if y ou are using a 1.5 volt battery for prolonged short-range operation. EXPERIMENTAL "BROADCASTING" PROJECTS To use the FM10A successfully as a "broad casting" service to interested listeners in a school or immediate neighborhood, most of your effort will be concentrat ed on smoot ...

  • Ramsey Electronics FM10A - page 17

    Although many sources exist for audio mixers, the Radio Shack No. 32 - 1105 is the least expensive commercial device currently available. Bear i n mind that specifications and model numbers for su ch accessory equipment can change from y ear to year. Also, some home-e ntertainment audio equipment includes simple m ixing capa bilities w hich will pe ...

  • Ramsey Electronics FM10A - page 18

    Ham radio books and m agazines are filled w ith ant enna principl es and ideas which can be adapted to your application. Also, you may wish to loo k at Radio Shack book No. 62-1083 on antennas. ANTE NN A ALTE RNAT IV ES If your situation involve s a single large building or mu lti-level home wh ere reception from the FM10 A antenna tends to be unev ...

  • Ramsey Electronics FM10A - page 19

    APPENDIX A: FCC RUL ES AND INFORMATION The Rules of the FCC (Federal Communications Commission) and yo ur kit built FM Stereo Transmitter. An interim explanation of applicable FCC regulations supplied as a personal assistance to FM10A builders, b y Dan F. Onle y (K4ZRA) It is the policy of Ramsey Electronics, In c., that k now ing and observing the ...

  • Ramsey Electronics FM10A - page 20

    held responsible for any violation thereof. 1. In the past, no "two-way communications" use of the 88-108 MHz FM broadcast band was permitted. This prohibition does not appea r in the current edition of Part 15. Previous editions of Part 15 discussed "wire less microphones" (such as Ramsey FM-1, FM-4, etc.), while the June 23, 1 ...

  • Ramsey Electronics FM10A - page 21

    space for several different FM statio ns, this is a "generous" limitation designed to a ccommodate cruder FM devices. Properly built and adjusted, the FM10A kit operates w ell with in this li mit. In fact, its signal should sound no "w ider" than any other FM station when listening on an ordinary F M radio. • c. FCC Rule 15.21 ...

  • Ramsey Electronics FM10A - page 22

    APPENDIX B: UNDERSTANDING LEGAL "FIELD STRENGTH" A "microvolt" is one-millionth of one volt and designated "µV" in the following explanations. The new FCC Part 15 Rules specify a maximum "Field Strength" of your transmitted signal. Since it is unlikely that you have the equipment to carry out accurate field ...

  • Ramsey Electronics FM10A - page 23

    broadcast on a school campus, campgr oun d or local neighbo rhood, as long as you do not cause interference to broadcast reception. “Why talk about acres"? There are three reas ons to transla te our look at "fie ld strength" into "acres". (1) The first one is easy : the numbers would get too cumbersome if we discussed you ...

  • Ramsey Electronics FM10A - page 24

    In fact, the most significant distance in the above chart is the 1.9 µV signal strength permissible at 1260 feet (about 1/4 mile), co vering a cir cular area of about 114 acres. A quick glance at st ereo FM receiver specifications shows typical sensitivity of 1.7 µV before considering high -gain antennas or preamplifiers. Your non-licensed signal ...

  • Ramsey Electronics FM10A - page 25

    4. Check your intended operating frequency ver y carefully, as clearly explained in this instruction m anua l, to ensure yo u will not cause interference to reception of licensed broadcasting. 5. If you receiv e ANY com plaint ab out your trans missions interferin g with broadcast reception, stop or change your operation IMMEDIATELY. 6. If you are ...

  • Ramsey Electronics FM10A - page 26

    [1] This device may no t c ause harmful interference, and [2] this device must accept any interf erence rece iv ed, including interference that may cause undesired operation. Final comment A well-inform ed person will see to day's FCC Rules to be evolving and progressively less-restrictive. Even though today's technology is far more compl ...

  • Ramsey Electronics FM10A - page 27

    The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your k it. Most problems can be solved w ithout contacting the factory . Notice that thi s is not a "fin e print" w arranty. We want y ou to unders tand your rights a nd ours too ! All Ramsey kits will w ork if assembled p roperly. The very fact that your kit ...

  • Ramsey Electronics FM10A - page 28

    Manual Price Only: $5.00 Ramsey Publica tion No. MFM10A Assembly and Instruction manual for: RAMSEY MODEL NO. FM10A FM STEREO TRANSMITTER RAMSEY ELECTRONICS, INC. 793 Canning Parkway Victor, New York 14564 Phone (716) 924-4560 Fax (716) 924-4555 www.ramseyelectr onics.com REQUIRED TOOLS • Soldering Iro n (Radio Sh ack #RS64-2072) • Thin Rosin C ...

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