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Samson ETM-3b User Manual

Samson ETM-3b
7 pages
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SQUEEZE KEYER
ETM-3b
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Samson ETM-3b Specifications

General IconGeneral
BrandSamson
ModelETM-3b
CategoryReceiver
LanguageEnglish

Summary

Specifications

Power Requirements and Circuit Components

Details power requirements, integrated circuits, transistors, diodes, and relays.

Keyer Operation Specifications

Covers dash-dot ratio, speed range, and SQUEEZE-keying with a double paddle.

Keying Output and Sidetone

Describes keyed line output, voltage/current limits, and the built-in sidetone.

Controls and Dimensions

Operator Controls

Details the speed control with on/off switch and the tune key.

Physical Specifications

Provides the physical dimensions and net weight of the keyer.

Functional Description

Power Supply Circuitry

Explains the power transformer voltage selection and electronic voltage stabilization.

Control and Timing Circuitry

Details oscillator, flip-flop stages, and transistor control for dot/dash generation and sidetone.

Keying Techniques

Explains conventional and SQUEEZE-keying, including character formation with paddle movements.

Paddle Adjustment and Keying Output

Paddle Adjustment Procedure

Instructions for removing the chassis and adjusting paddle gap and tension.

Keying Output Interface

Describes the dry reed switch keying output and the protective 220 Ohm resistor.

Description of Keyer Operation

Power Supply and Keyer Operation

Details power transformer operation, stabilized AC supply, and keyer timing circuits.

Keying Modes and Paddle Adjustment

Explains SQUEEZE-keying advantages and paddle adjustment steps.

Keying Output Details

Discusses the dry reed switch, its snap action, and output current limiting.

Electronic Morse Keys for Maritime Radio

Keying Line Connection

Clarifies that the keying line is not electrically connected to the device's electronics or chassis.

Keying Output Power and Protection

Specifies max power, voltage, current, and required series resistors for transmitter keying.

Sidetone and Speaker Connection

Details sidetone impedance, speaker requirements, and battery connection for the amplifier.

Important Safety Warnings

Warns against using filtered Junker-type keys simultaneously with electronic keys.

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