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SCA FM SUBCARRIER
DECODER KIT
Ramsey Electronics Model No.
Commercial-free music, stock quotes, news - all available
around-the-clock on your local FM station? Sure, buried in a
special subcarrier that you'll be able to tune with the SCA-1.
This is how most restaurants, department stores, and hotels
pick up their music.
•
Tunes entire SCA subcarrier band 50 - 100 KHz
•
Excellent performance - uses PLL decoder
•
Feature both speaker and line-level audio outputs
•
Connects to any FM receiver or simply plugs into our
FR-1 FM broadcast receiver
•
Band-pass filtered input for excellent fidelity
•
Front panel volume and tuning controls
•
Informative manual answers questions on
theory, hook-ups, and uses - enhances resale
value , too!
•
Add our case set for a finished 'Pro'
look. Cases match all Ramsey products
•
Clear, concise assembly instructions carefully guide you
to a finished kit that works the FIRST time!
SCA1
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Summary of Contents for Ramsey Electronics SCA1
- Page 1 SCA FM SUBCARRIER DECODER KIT Ramsey Electronics Model No. SCA1 Commercial-free music, stock quotes, news - all available around-the-clock on your local FM station? Sure, buried in a special subcarrier that you’ll be able to tune with the SCA-1. This is how most restaurants, department stores, and hotels pick up their music.
- Page 2 1994 by Ramsey Electronics, Inc. 590 Fishers Station Drive, 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
Ramsey Publication No. MSCA1 Price $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR SCA1 FM AUDIO SUBCARRIER DEMODULATOR TABLE OF CONTENTS Introduction to the SCA ....4 FM and subcarrier background ..4 Circuit description ......6 Parts list ......... 7 Parts layout diagram ...... - Page 4 FM broadcast programming. Be aware that not all cities have FM stations that transmit SCA subcarrier signals, but if any are there, the SCA1 will find them! While this kit can be easily assembled using our step by step instructions, the actual connection to a FM receiver can be quite complicated and should only be attempted by a qualified technician.
- Page 5 The Right audio channel. Now, the number "2" in 2R and 2L simply means that the signal is twice the amplitude (twice as loud) and should not be confused with interpreting it as two left or right channels. • SCA1...
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Page 6: Circuit Description
Why all this talk about stereo and its subcarriers? To give you a little familiarity with subcarriers and to let you know that there's more out there than expected! SCA1 CIRCUIT DESCRIPTION The input is bandpass filtered using L1, L2, and associated components to isolate the higher frequency subcarriers. - Page 7 SCA1 SUBCARRIER DEMODULATOR KIT PARTS LIST RESISTORS 2 ohm [red-black-gold] R13 1K ohm [brown-black-red] R8,9,10,11 2.2K ohm [red-red-red] R3 10K ohm [brown-black-orange] R2,5,6,7 22K ohm [red-red-orange] R14 220K ohm [red-red-yellow] R4 CAPACITORS .001 uf disc [marked .001 or 102 or 1nf] C3,7,9,10,11 .01 disc [marked .01 or 103 or 10nf] C1,6,8,14,20...
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Page 8: Parts Layout Diagram
SCA SUBCARRIER DEMODULATOR PARTS LAYOUT DIAGRAM • SCA1... - Page 9 • SCA1...
- Page 10 FIRST ASSEMBLY STEPS Since you may appreciate some warming-up soldering practice as well as a chance to put some "landmarks" on the SCA1 PC board, we first will install some "hardware" components, to make the up-down, left-right orientation of the PC board as clear as possible. Initially, it can be quite confusing to find the right holes, even for an experienced builder.
- Page 11 9. Install C6, .01uf disc [marked .01, 103 or 10 nf]. 10. Install C10, .001uf disc [marked .001, 102 or 1 nf]. 11. Install L1, 1800uH inductor [a large green cylinder labeled 182]. 12. Install L2, the other 1800uH inductor [again, marked 182]. • SCA1...
- Page 12 24. Using a scrap lead, install a test point in the TP1 position. Usually, it is best to bend the wire in a loop at the top so it is easy to connect to when a test is required. • SCA1...
- Page 13 PC board traces underneath. 29. Install R14, 22K ohm [red-red-orange]. The VCO/PLL section of the SCA1 is now complete. The VCO’s internal oscillator frequency can be adjusted using pot R1. The PLL section will then compare the applied input frequency with the VCO frequency. If they are within “locking range”...
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Page 14: Set-Up And Testing
Brush the solder side of the board with a stiff brush to make sure that no loose wire trimmings or solder drippings (tsk tsk) are lodged between connections. SCA DECODER SETUP AND TESTING Initially, the demodulator can be tested as follows : • SCA1... - Page 15 4. If you have access to an audio oscillator, you may apply a signal in the 50 to 100 KHz range to the input of the SCA1. While watching the TP1 test point, you should see the frequency changing to match the applied signal.
- Page 16 The other end of this coax is connected to the SCA1's input jack, J1. (If your radio is plugged into the AC line, be sure to use caution when poking around! And, be sure your SCA1,...
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Page 17: Troubleshooting Guide
In this case we can only suggest that you verify that the SCA1 does indeed operate using an audio generator as outlined in the Testing section of your manual. -
Page 18: Enclosure Ideas
It may be necessary to cut away the molded posts which secure the tape cassette itself. These storage boxes come in several styles, so pick one that looks truly practical as a project enclosure. • SCA1... -
Page 19: 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... - Page 20 Desoldering Braid Ramsey RTS08 • Digital Multimeter Ramsey M133 Price: $5.00 Ramsey Publication No. MSCA1 Assembly and Instruction manual for: RAMSEY MODEL NO. SCA1 SCA DECODER KIT This Quality Electronics Kit was designed and packed in the USA • SCA1...
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