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AM BROADCAST
TRANSMITTER KIT
Ramsey Electronics Model No.
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 AM1 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 !
•
AM1
1
AM1
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Summary of Contents for Ramsey Electronics AM1
- Page 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 AM1 transmitter is designed specifically for simplicity of construction and use - an ideal first kit ! •...
- Page 2 1994 by Ramsey Electronics, Inc. 793 Canning Parkway, 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. Printed in the United States of America. •...
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Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR AM BROADCAST TRANSMITTER AM1 TABLE OF CONTENTS Introduction to the AM1 ....4 AM1 Circuit Description ....4 Schematic Diagram ....... 6 Parts Layout Diagram ....7 Parts List ........8 Assembly Instructions ....9 Antenna Considerations .... -
Page 4: Am1 Circuit Description
FM wireless units for years. Recent requests for an AM type transmitter have been answered with this kit. The Ramsey AM1 transmitter is a true broadcast transmitter, which any person may build and use in accordance with the rules of one’s national telecommunications authority. -
Page 5: Schematic Diagram
Low Freq uenc y Audio Wa ve form High Freq ue ncy Radio Carrier Amplitude Mod ulated Signal output for the RF carrier frequency. The audio input path is routed from J1, the audio input source, to transistor Q2 to amplify the incoming signal. Notice that the transistor is biased to be linear using resistors R3, R5, and R6. -
Page 6: Parts Layout Diagram
PARTS LAYOUT DIAGRAM •... -
Page 7: Parts List
[fine wire wound on plastic and cardboard cylinder] (L2) SEMICONDUCTORS NPN transistors [marked 3904] (Q1,2,3,4,5,6) MISCELLANEOUS PARTS AND HARDWARE RCA type PC mount connectors (J1,2) 2.5mm power jack (J3) DPDT pushbutton switch (S1) AM1 printed circuit board “diddle stick” plastic alignment tool •... -
Page 8: Assembly Instructions
ASSEMBLY INSTRUCTIONS There are numerous solder connections on the AM1 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. - Page 9 3. Install the 2.5 mm power connector in the J3 position. We’ll now begin to construct the RF oscillator section of the AM1. Be sure to mount the components as close as possible to the PC board to avoid “radiating”...
- Page 10 11. Install Q5, a 2N3904 transistor. Be sure to orient it correctly! See the 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. Electrolytic capacitors are polarized with a (+) and a (-) lead and must be installed in the correct orientation.
- Page 11 AM transmitter. Follow the following final assembly instructions carefully. AM1 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.
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Page 12: Antenna Considerations
Install the correct values for C9, C10, and C16. CONGRATULATIONS You have just completed your AM1 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”... -
Page 13: Alignment Procedures
The best audio source for testing if you’ve configured the AM1 for line level is the line level outputs of a tape deck or CD player. Most stereo systems have a variety of output jacks of which one or more are “line level”. -
Page 14: Troubleshooting
APPROXIMATE DC VOLTAGES AM-1 KIT WITH NO MODULATION APPLIED +8.5 VDC +5.6 VDC OSCILLATOR AT 1600 KHz YOUR READINGS MAY DIFFER SLIGHTLY +1.1 VDC + .4 VDC 6.5 VDC +3.2 VDC 1.2 VDC 8.5 VDC - 3.4 VDC 3.4 VDC POWER "ON"... -
Page 15: Fcc Information
Licensed Broadcast stations and their listeners have all the rights! Your non- licensed use of any device such as the AM1 has absolutely no rights at all over the rights of a licensed broadcast operator. If your operation of the AM1 interferes with anyone’s use or enjoyment of an FCC licensed transmission... -
Page 16: Antenna Experimenting
“On the Air” Etiquette 1. Do not use “made up” call signs to identify your transmissions. Only the FCC has the authority to grant such callsigns. Use some other way to identify your transmitting activity, such as “ This is radio 550, Pittsford School Student Radio,”... - Page 17 “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see in future publications. Please submit comments or ideas to: Ramsey Electronics Inc. Attn. Hobby Kit Department 793 Canning Parkway...
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Page 18: Ramsey Kit Warranty
'1K ohm' resistors are actually the '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. - Page 19 Holder for PC Board/Parts (RS64-2094) • Desoldering Braid (RS-2090) Manual Price Only: $5.00 Ramsey Publication No. MAM1 Assembly and Instruction manual for: RAMSEY MODEL NO. AM1 BROADCAST AM TRANSMITTER KIT RAMSEY ELECTRONICS, INC. 793 Canning Parkway Victor, New York 14564 Phone (716) 924-4560 •...
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