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SPEECH
SCRAMBLER /
DESCRAMBLER KIT
Ramsey Electronics Model No.
Communicate in privacy over any audio path! Full duplex
operation so this unit can scramble and descramble at the same
time! E-Z hookup instructions for radio, or scanner.
•
Uses "state of the art" digital electronic filtering for superior noise
free sound! Speech inversion type system - similar to SSB.
•
Decodes most cordless phones and basic 2-Way radio systems
•
Loud, amplified speaker output - no need for an external amp!
•
Super clean, low noise audio - excellent audio quality!
•
Accepts mike, line, or speaker level inputs.
•
Handy phono type input and output connections.
•
Operates on 9 to 15 volts DC.
•
Super easy hook-up with pushbutton "bypass" mode. Switch from
scramble/descramble to feed through without moving wires!
•
Informative manual answers questions on theory, hookups and
uses - enhances resale value, too!
•
Add our custom case and Knob set for a finished "Pro" look.
SS70A • 1
SS70A
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Summary of Contents for Ramsey Electronics SS70A
- Page 1 SPEECH SCRAMBLER / DESCRAMBLER KIT Ramsey Electronics Model No. SS70A Communicate in privacy over any audio path! Full duplex operation so this unit can scramble and descramble at the same time! E-Z hookup instructions for radio, or scanner. • Uses “state of the art” digital electronic filtering for superior noise free sound! Speech inversion type system - similar to SSB.
- Page 2 1995 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. SS70A • 2...
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Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR SPEECH SCRAMBLER / DESCRAMBLER KIT TABLE OF CONTENTS Introduction to the SS70A ..... 4 Circuit Description ......5 Parts List ........7 Schematic Diagram ....... 8 SS70A Assembly instructions ..9 Testing the SS70A ....... 12 Hook-up Configurations .... -
Page 4: Circuit Description
Just as its scrambling, technically called “speech inversion”, can be decoded by knowledgeable users of similar equipment, the SS70A in turn can be used experimentally to descramble some public service communications, cordless phones and other systems where low cost scrambling is employed. - Page 5 LM-380 2 watt audio amplifier or line level audio output. Front panel controls include power on/off switch S1, scramble/bypass switch S2, and RX input level select switch S3 which allows the SS70A to be used with either line or speaker level inputs. Potentiometer R11 controls audio level when speaker level output is selected.
- Page 6 RAMSEY Learn-As-You-Build KIT ASSEMBLY There are numerous solder connections on the SS70A printed circuit board. Therefore, PLEASE take us seriously when we say that good soldering is essential to the proper operation of your scrambler! Following, are a few quick tips to make the assembly process a bit more enjoyable.
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Page 7: Parts List
SS70A PARTS LIST Sort and “check off” the components in the boxes provided. It’s also helpful to sort the parts into separate containers to avoid confusion while assembling. RESISTORS AND POTENTIOMETERS 2 ohm resistor [red-black-gold] (R13) 10 ohm resistor [brown-black-black] (R6) -
Page 8: Schematic Diagram
SS70A • 8... -
Page 9: Ss70A Assembly Instructions
SS70A ASSEMBLY INSTRUCTIONS 1. First, install switches S1, S2, and S3. Be sure that all legs fit through the circuit board before soldering. Solder all the pins. 2. Install the volume control pot, R11. Solder the three component connections as well as the mounting pins. - Page 10 Take a break and recheck your work. It’s also a good time to take a look at the schematic diagram and follow through what we’ve done. Moving on, we'll build the "heart" of your scrambler unit, containing the MX128 IC and associated components. Since the majority of the work is SS70A • 10...
- Page 11 The few remaining components comprise the power supply stage. Remember to follow along in the schematic and doublecheck your work as you go. 50. Install C17, a 1000 uF electrolytic capacitor. Be sure to orient it correctly as shown in the parts diagram. SS70A • 11...
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Page 12: Testing The Ss70A
The SS70A requires a clean source of power from 9 to 15 Volt DC which is connected to power input jack J5 (center pin is positive). Current requirements are typically 250-500mA, which means a decent battery set (C or D cells) or good quality power supply may be used. -
Page 13: Hook-Up Configurations
SPEAKER LEVEL OUTPUT Install the jumper block between the pins on J4 labeled “SPEAKER”. Before doing any hasty or blind experimenting, it is useful to understand exactly what we are looking for in the operation of the SS70A Speech Scrambler. •... - Page 14 External Speaker or Earphone TAPE RECORDER CONNECTION In hooking up a tape recorder, we’ll make use of the SS70A’s TX and RX paths. We’ll scramble the audio through the TX path and send it on to the recorder’s input to be recorded. We’ll use the SS70A’s RX path to take the recorder’s playback audio and unscramble.
- Page 15 “keys” the transmitter when the button is depressed, and cannot be excluded from your wiring considerations. Our basic audio connections are very simple, we run our mike audio through the SS70A’s TX path and route the radio’s receive audio through the SS70A RX path. Due to the large number of types of keying circuits, it is best to contact the transceiver manufacturer concerning proper installation of this scrambler “in line”...
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Page 16: Troubleshooting
(as used in the SS-70A) provides enough security to keep things private. When National security is at risk, only the most complex and expensive schemes will do. Your local police department may fall somewhere in between. SS70A • 16... - Page 17 Please submit comments or ideas to: Ramsey Electronics Inc. 590 Fishers Station Drive Victor, NY 14564 And once again, thanks from the folks at Ramsey! SS70A • 17...
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Page 18: Parts Layout Diagram
SS70A PARTS LAYOUT DIAGRAM SS70A • 18... -
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: Fishers Station Drive Victor, New York
Desoldering Braid Ramsey RTS08 • Digital Multimeter Ramsey M133 Price: $5.00 Ramsey Publication No. MSS70A Assembly and Instruction manual for: RAMSEY MODEL NO. SS70A SPEECH INVERSION KIT TOTAL SOLDER POINTS RAMSEY ELECTRONICS, INC. ESTIMATED ASSEMBLY 590 Fishers Station Drive TIME Victor, New York 14564 Beginner ....
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