Ramsey Electronics FM10A Bedienungsanleitung

FM STEREO

TRANSMITTER

Ramsey Electronics Model No. FM10A

•Great for transmitting your tape deck or CD player throughout the

house, yard or even your car.

•Powerful enough for college or neighborhood radio stations - in

use all over the world.

•Fantastic audio quality sounds better than most stations on the

dial. And we’ll tell you why!

•Easily connects to the line-level outputs on any tape deck, stereo

system or CD player.

•Some users hook up one channel to the scanner and the other to

their two way radio. Now you can hear what’s going on around

town up to several blocks away from your house with a simple

stereo receiver... and adjust the volume of each individually with

your balance control!

•Add a mike-mixer and tape or CD deck for a “PRO” sounding radio

station.

•Operates on 1.5 to 15 volts, using a crystal controlled subcarrier.

•Tunable anywhere in the 88-108 MHz FM band.

•Clear, concise instructions guide you step by step.

Own and operate your own FM Stereo broadcast station.

Definitely not a toy, the FM-10A has an exceptional transmission

range... and the audio quality puts your favorite radio station to

shame. See why this is one of our most popular kits!

PARTIAL LIST OF AVAILABLE KITS

RAMSEY TRANSMITTER KITS

• FM25, MP3FM FM Stereo Transmitters

• AM1 AM Transmitter

• TV6 Television Transmitter

• FM100 Professional FM Stereo

Transmitter

RAMSEY RECEIVER KITS

• FR1 FM Broadcast Receiver

• AR1 Aircraft Band Receiver

• SR2 Shortwave Receiver

• AA7 Active Antenna

• SC1 Shortwave Converter

RAMSEY HOBBY KITS

• SG7 Personal Speed Radar

• SS70A Speech Scrambler

• MX5, MX-10 Mixers

• MD3 Microwave Motion Detector

• PH10 Peak hold Meter

• STC1 Stereo Transmitter Companion

RAMSEY AMATEUR RADIO KITS

• FX 146 VHFTransceiver

• HR Series HF All Mode Receivers

• QRP Series HF CW Transmitters

• CW7 CW Keyer

• 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 catalog.

FM STEREO TRANSMITTER KIT INSTRUCTION MANUAL

Ramsey Electronics publication No. MFM10A Revision G

First printing: August, 1994

written permission of Ramsey Electronics, Inc. Printed in the United States of America.

FM10A FM STEREO

TRANSMITTER

Ramsey Publication No. MFM10A

Manual Price Only: $5.00

TABLE OF CONTENTS

Introduction to the FM10A ....................................... 4

FM10A Circuit Description....................................... 5

Schematic Diagram ................................................. 5

Parts List ................................................................. 6

Parts Layout Diagram.............................................. 7

Assembly Instructions ............................................. 8

Choosing an Operating Frequency.......................... 13

Adjusting your FM10A ............................................. 14

Using your FM10A Within the Home ....................... 15

Power Supply Considerations ................................. 15

LED Power On Indicator.......................................... 15

Experimental Broadcasting Projects........................ 16

Antenna Ideas ......................................................... 17

Troubleshooting Guide ............................................ 18

Appendix A: FCC Rules and Information................. 19

Appendix B: Understanding Field-Strength ............. 22

Summary................................................................. 24

FM10A Kit Warranty................................................ 27

KIT ASSEMBLY

AND INSTRUCTION MANUAL FOR

RAMSEY ELECTRONICS, INC.

793 Canning Parkway

Victor, New York 14564

Phone (716) 924-4560

INTRODUCTION

The Ramsey FM10A is a true STEREO FM broadcast transmitter, which

any person may build and use in accordance with the rules of your nation’s

telecommunications authority. For U.S. residents, that authority is the

Federal Communications Commission (FCC). The FM10A's low-power

broadcasting capability and other practical uses can be fun and interesting

for people of all ages, but the FM10A is definitely not a toy. We will refer to

the FCC regulations frequently in this manual and provide you with some

information necessary to enjoy the FM10A's capabilities in accordance with

the law.

Typical uses for the FM10A include the following:

•Extension of home stereo system - without wires.

•Listening aid for auditoriums, churches.

•Student-operated school radio station.

•College dorm favorite music broadcast service.

•Short-range, two-channel experiments and demonstrations.

We think you will be very pleased with the transmitting range, audio quality,

frequency stability and stereo channel separation of this build-it-yourself FM

stereo transmitter. If you follow our assembly directions carefully and use

your FM10A in accordance with applicable FCC rules, a whole new world of

sharing music, news and views with friends and neighbors awaits you.

Since the sharing of music and information is vital to the culture of our late-

20th-century global community, we realized that our FM10A low-power FM

Stereo Transmitter kit was certain to attract worldwide interest among

hobbyists, students and "pioneers." While the use of the FM10A may need

to be limited to "wireless stereo extensions" in some USA households (to

comply with FCC Rules, Part 15), we have seen it serve very well as a

serious, though simple, broadcast station for remote villages throughout the

world where low cost AM-FM receivers are available to people of all

economic levels. After you're done building your kit, sitting back and

listening to your handiwork, consider this: many other FM10A's just like

yours are faithfully relaying news and information to listeners in remote parts

around the world. The FM10A is most definitely not a toy!

CIRCUIT DESCRIPTION

A quick glance at the Schematic Diagram shows that the custom FM

stereo transmitter IC (U1) is at the heart of the FM10A. The control of U1 is

determined by its surrounding circuitry. Potentiometers R1 and R4 allow for

adjustment of input level. Resistors R3 and R6 set the pre-emphasis

characteristics (75uS for USA and 50uS for Europe). R7 permits adjustment

of stereo balance. L1 and C16 form an adjustable resonant circuit to set the

carrier operating frequency. Diodes D1,2 and 3 regulate the voltage to U1 at

2.1 volts DC, though Q1 may be operated safely up to 12-15 VDC. The RF

output of Q1 feeds both the on-board whip antenna and J3 for an external

antenna.

PARTS 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: Selecting 18, 22 or 27 pf for C16, establishes the FM-band

frequency adjustment range. See “Choosing an Operating

Frequency.”

1 220 pf disc capacitor (marked 220 or 221) (C9)

8 .001 µF disc capacitor (marked .001 or 102 or 1 nf)

(C6,10,12,13,17,18,20,21)

2 .0047uF disc capacitors (marked 472) (C1,4)

4 4.7 to 10 µF electrolytic capacitors (C2,3,5,11)

1 470 µF electrolytic capacitor (C19)

1 1000 µF electrolytic capacitor (C22)

RESISTORS

2 270 ohm [red-violet-brown] (R9,R13)

1 470 ohm [yellow-violet-brown] (R8)

1 4.7K ohm [yellow-violet-red] (R11)

3 10K ohm [brown-black-orange] (R3,R6,R10)

2 15K ohm [brown-green-orange] (R3,R6)

1 150K ohm [brown-green-yellow] (R12)

1 100K yellow trimmer potentiometer (marked 104) (R7)

2 1K yellow trimmer potentiometer (marked 102) (R1,R4)

SEMICONDUCTORS

3 Glass bead diodes (similar to 1N4148) (D1,2,3)

1 2SC2498 or 2570 NPN VHF transistor (Q1)

1 18-pin DIP Custom FM Transmitter integrated circuit (U1) with

matching socket

HARDWARE AND MISCELLANEOUS

1 38 KHz crystal (small silver cylindrical "can" with 2 small leads), taped

to a piece of paper.

1 Shielded inductor coil (L1) (small square silver “can”)

1 Ramsey FM10A Printed circuit board

1 Plastic alignment screwdriver

1 PC board mounted push-button switch

3 RCA-type PC-mount jacks (J1,2,3)

1 2.5 mm phone jack (J4)

1 9-volt battery hold-down clamp

1 9-volt battery snap connector

REQUIRED, NOT SUPPLIED:

9-volt alkaline or heavy-duty battery

Shielded stereo audio cables

Line-level output audio source (such as a tape deck or CD player)

External antenna, small gauge coax and RCA plug, OR PC board

mounted telescoping whip antenna (included with the Ramsey CFM

case and knob set.

OPTIONAL

Ramsey FM10A case and knob set (CFM), or your own enclosure

LED "power on" indicator and 1K resistor

Audio switching-mixing accessories of your choice

FM10A PARTS LAYOUT DIAGRAM

ASSEMBLY INSTRUCTIONS

Building your FM10A Stereo Transmitter

The following FM10A step-by-step assembly and adjustment directions are

written with newcomers in mind. While many Ramsey kits are purchased by

experienced hobbyists and ham radio operators, our instructions presume

that this stereo transmitter could be your first ever kit project.

Ramsey Electronics Kit instruction manuals are designed around our

"Learn as You Build" philosophy. To the extent that it is reasonably possible,

we like to help you see why a given part goes into its PC board holes, as well

as showing you how to do it. Our "Learn as You Build" assembly strategy

works very well with our simpler kits, such as receivers and ham

transmitters, where we can guide you through the schematic diagram from

the antenna to the speaker. When a multi-function IC "chip" is the heart and

soul of one of our kits, as is the case in this FM10A stereo transmitter, we try

to make a reasonable compromise between following the signal path and

just getting all parts in properly so you can enjoy your kit as soon as

possible!

So, you can expect the following directions to be a nice blend of "Learn as

You Build" and "Let's get these parts in right and as quickly as possible!"

First assembly steps

Use the boxes to check off your progress.

Check all received parts against the Parts list on page 6. The parts list

describes the various markings that may be found on the kit parts.

Since you may appreciate some "warm-up" soldering practice as well as a

chance to put some "landmarks" on the FM10A PC board, we'll first install

some "hardware" components, to make the up-down, left-right orientation of

the PC board as clear as possible.

In ALL the following instruction steps, our word "INSTALL" means this:

•Insert the part, oriented correctly, into its correct holes in the PC

board.

•If helpful, gently BEND the part's wire leads or tabs to hold it in place,

with the body of the part snugly against the top "component

side" of the PC board.

•SOLDER ALL wires or pins of the part, whether the two wires of a

resistor or the 18 pins of an IC socket.

•Nip or "trim" all excess wires extending beyond each solder

connection, taking care that wire trimmings do not become lodged in

PC board solder connections.

Enough said. . . Let's get building!

1. Install S1, the DPDT push-button switch. It fits correctly only one way.

Ensure that the white plastic switch extends out over the edge of the

printed circuit board. Solder all six pins.

2. Install J1, the Right Channel input jack. Solder all 4 points of the jack

securely.

3. Install J2, the Left Channel input jack. Solder all 4 points of the jack

securely.

4. Install J3, the RF output (antenna) jack. Solder all 4 points of the jack

securely.

5. Install J4, the 2.5 mm phone jack (external DC input). Solder all 3

pins.

6. Install the 18-pin DIP socket supplied with your kit. There is no right

or wrong direction to this socket, but the U1 IC itself certainly needs to

be inserted correctly (later). Taking care of this socket early in the

project will help you with positioning additional parts and will fine-tune

your soldering technique. Before soldering, make sure the socket body

is flush against the PC board, and that all 18 pins have been inserted.

Solder all 18 pins and then CAREFULLY check to ensure you have not

caused any "solder bridges" between pins.

7. Now that the IC socket has your prime attention, carefully insert the

FM transmitter IC (U1) into the socket, taking gentle care that ALL 18

pins get into their proper holes. The orientation of the notched end, as

shown on the Parts Layout Diagram is critically important.

Progress Note: The preceding steps have secured a sufficient number of

components to your PC board to make general orientation around the board

much clearer for installing additional parts. Further parts will be installed in

three phases or groupings.

Wiring the audio input circuits

We encourage you to peek at the schematic diagram and learn the

functions of the following parts. However, the sequence of installation is in

the order of convenience and speed. If you wish, insert the parts groupings

as one operation, then solder and nip all connections.

8. Install R1, one of the small yellow trimmer potentiometers marked

"102". Don't confuse it with R7 which is marked "104".

9. Install R4, the other yellow trimmer marked "102". These two

trimmers will allow you to adjust the input level.

10. Install C1, .0047 µF (marked .0047 or 472). If you are building your

kit for use in North America or Japan, resistors in steps 11 and 12 are

installed as printed. For use in Europe, Russia and some other

countries, use 10K ohm resistors in steps 11 and 12. These resistors set

the pre-emphasis characteristics for the FM10A. Pre-emphasis is a

technique used in FM transmitters to increase the high frequency signal

to noise ratio. If you desire a "brighter" sound you may use the 10K ohm

resistors rather than the 15K ohm parts.

11. Install R3, 15K [brown-green-orange].

12. Install R6, 15K [brown-green-orange].

13. Install C4, .0047 µF (marked .0047 or 472).

Electrolytic capacitors have a right and wrong way to be installed. Usually,

capacitors have a black strip which indicates their ( - ), negative lead and the

PC board or Parts Layout Diagram will show the ( + ), positive side of the

capacitor's installation hole. Be sure to place the ( + ) capacitor lead into the

PC board ( + ) hole and the ( - ) lead into the ( - ) hole. Observe correct

polarity when installing the following three electrolytic capacitors:

14. Install C2, 4.7 or 10 µF. Don’t forget... the proper orientation is noted

on the PC board or Parts Layout Diagram.

15. Install C5, 4.7 or 10 µF. Observe correct polarity.

16. Install C3, 4.7 or 10 µF. Remember correct polarity.

Diodes also have a right and wrong way to be installed. The cathode

(banded) ends face toward the outside of the PC board, away from the IC

circuitry. Observe correct polarity when installing the following three diodes.

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