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RAMSEY AM-1 AM BROADCAST TRANSMITTER KIT

AM-1 AM BROADCAST TRANSMITTER

Quick Reference Page Guide

Introduction to the AM-1 4

AM-1 Circuit Description 4

Schematic Diagram 6

Parts Layout Diagram 7

Parts List 8

Assembly Instructions 9

Antenna Considerations 13

Alignment Procedures 13

Experimental Broadcasting 14

Troubleshooting 15

FCC Information 16

Antenna Experimenting 17

Manual Price Only: $5.00

Ramsey Publication No. MAM-1

Assembly and Instruction manual for:

RAMSEY MODEL NO. AM-1 BROADCAST AM

RAMSEY ELECTRONICS, INC.

793 Canning Parkway

Victor, New York 14564

Phone (716) 924-4560

REQUIRED TOOLS

? Soldering Iron (Radio Shack #RS64-2072)

? Thin Rosin Core Solder (RS64-025)

? Needle Nose Pliers (RS64-1844)

? Small Diagonal Cutters (RS64-1845)

? <OR> Complete Soldering Tool Set

(RS64-2801)

ADDITIONAL SUGGESTED ITEMS

? Soldering Iron Holder/Cleaner (RS-64-

TOTAL SOLDER POINTS

ESTIMATED ASSEMBLY

TIME

Beginner ..............3 hrs

Intermediate .........1.5 hrs

Advanced ............1 hr

Page 1

RAMSEY AM-1 AM BROADCAST TRANSMITTER KIT

AM BROADCAST

TRANSMITTER KIT

Ramsey Electronics Model No. AM-1

Ever want to be your own disc jockey or talk show host ? Build

and run your own AM broadcast station with this exciting kit !

The AM-1 transmitter is designed specifically for simplicity of

construction and use - an ideal first kit !

? Great for transmitting your tape deck, CD player, or voice

throughout the house, yard, or car !

? Powerful enough for high school, college, or neighborhood radio

station - in use the world over !

? Easily tunes to any clear channel on the AM broadcast band. - from

530 to 1750 KHz.

? Operates on the same principle as the “big-boys”, learn how

commercial transmitters work as well !

? Superior performance - transmits up to 1/4 mile !

? Adjustable input level - can be configured for line level or

microphone input.

? Unit runs on 9 - 12 volts DC.

? Handy information on FCC rules and antenna hints.

? Complete and informative instructions guide you to a kit that works

the first time, every time - enhances resale value, too !

Summary of content (10 pages)

PAGE 1
AM-1 AM BROADCAST TRANSMITTER Quick Reference Page Guide Introduction to the AM-1 4 AM-1 Circuit Description 4 Schematic Diagram 6 Parts Layout Diagram 7 Parts List 8 Assembly Instructions 9 Antenna Considerations 13 Alignment Procedures 13 Experimental Broadcasting 14 Troubleshooting 15 FCC Information 16 Antenna Experimenting 17 REQUIRED TOOLS ? Soldering Iron (Radio Shack #RS64-2072) ? ? ? ? Thin Rosin Core Solder (RS64-025) Needle Nose Pliers (RS64-1844) Small Diagonal Cutters (RS64-1845) Comple
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The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting the factory.
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8 ' WHIP 2. Identify the location and purpose Ramsey Publication No. MAM-1 Manual Price Only $5.00 Paper TubeTUBE PAPER of your transmissions from time to time. This is a common courtesy toward other persons who may hear your transmission. The FCC is toughest about clandestine transmission which costs time and money to track down. 3. If you are contacted by the FCC regarding the use of this device, cooperate fully and promptly. To Transmitter TO TRANSMITTER4.
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INTRODUCTION Many times we wish to be heard via wireless communications. Whether transmitting music or voice, what’s required is a stable transmitter tunable to an unused frequency on the broadcast band. Here at Ramsey, we have produced several models of FM wireless units for years. Recent requests for an AM type transmitter have been answered with this kit.
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EXPERIMENTAL “BROADCASTING” PROJECTS To use the AM-1 successfully as a “broadcasting” service to interested listeners in a school or immediate neighborhood, most of your effort will be concentrated on smoothly “managing” or mixing the audio signals into the transmitter input. Operation of the transmitter consists of the following: If you wish to “mix” between audio inputs, i.e. microphone and music sources, you may need an external audio “mixer” unit.
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AM-1 SCHEMATIC DIAGRAM CONGRATULATIONS You have just completed your AM-1 wireless broadcast unit. Take a well deserved break now. Give your eyes a rest. When you return, be sure to check over your work on the entire circuit board. Energizing the circuit board with solder “bridges” or misplaced components can damage your kit. ANTENNA CONSIDERATIONS For many applications, a 5 - 6 foot wire antenna connected to the center pin of the “RF OUT” connector will produce satisfactory results.
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decisions on how we are going to use our AM transmitter. Follow the following final assembly instructions carefully. PARTS LAYOUT DIAGRAM AM-1 Final Assembly Instructions If you wish to use a microphone as the audio source for your AM transmitter, you’ll need to increase the gain of the audio amplifier by installing electrolytic capacitor C4. If the input is to be “line level” audio from a tape or CD player, there is no need to install capacitor C4.
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to power this kit. Instead, a battery “pack” consisting of eight 1.5 volt cells, a 12V sealed battery, or other external 12V DC supply may be used. PARTS LIST Transmitter Frequency (KHz) 520 - 660 C9 (pF) C10 (pF) C16 (pF) 1000 (marked .001 or 102) 2000/2200 (marked .002/.0022) 2000/2200 (marked .002/.0022) Please verify that the following items are in your kit before beginning assembly. 550 - 720 2000/2200 (marked .002/.0022) 2000/2200 (marked .002/.
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? 10. Install R7, another 270 ohm [red-violet-brown]. ? 11. Install Q5, a 2N3904 transistor. Be sure to orient it correctly! See the ? 1 ? 1 ? 1 DPDT pushbutton switch (S1) AM-1 printed circuit board “diddle stick” plastic alignment tool parts diagram for correct orientation. ? 12. Install C7, .01 µF disc capacitor [marked .01 or 103 or 10nF]. ? 13. Install R9, 270 ohm [red-violet-brown]. ? 14. Install C15, 220 µF electrolytic capacitor.
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ASSEMBLY INSTRUCTIONS 5. Solder all connections unless directed otherwise. Use enough heat and solder flow for clean, shiny, completed connections. There are numerous solder connections on the AM-1 printed circuit board. Therefore, PLEASE take us seriously when we say that good soldering is essential to the proper operation of your transmitter! ? ? ? ? Use a 25-watt soldering pencil with a clean, sharp tip. Use only rosin-core solder intended for electronics use.