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1950 keyer, military aka Morse code practice oscillator CPO
1950 keyer, military aka Morse code practice oscillator CPO
Regular price
$250.00 USD
Regular price
$0.00 USD
Sale price
$250.00 USD
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A 1950s-style Morse code practice oscillator, often referred to as a "keyer" or code practice oscillator (CPO), is
a vintage training device designed to teach ham radio operators how to send and receive Morse code by producing an audible tone when a telegraph key is pressed
. These units often feature a straight key mounted on a heavy metal base, an internal speaker or headphone jack, and adjustable volume/tone controls.
Common 1950s-1960s Models & Features
- Ameco Model OCM-2 : A popular vintage, portable unit often featuring a built-in speaker and key.
- Heathkit HD-1416 : A common, classic kit-built oscillator used to generate tones for code practice.
- Insuline Corporation of America (ICA) "Signa-Tone" : Another vintage, compact model frequently cited.
- Modern Recreations: The MFJ-557 Deluxe Morse Code Practice Oscillator is a modern, readily available unit that mimics the traditional heavy-duty, straight-key design of that era. [ 1 , 4 ]
Key Characteristics
- Mechanism: When the key is closed, it completes a circuit, producing an audio tone.
- Components: Often includes a transistor (or tube in very early models) and an RC (resistor-capacitor) circuit to generate the tone.
- Purpose: Essential for training CW (continuous wave) operators to maintain rhythm and proper spacing
Finding Vintage Items
- eBay: A primary source for used, vintage units from companies like Ameco, Heathkit, or Claricon.
- Hamfests: Often available at local amateur radio swap meets and flea markets.
Vintage units are sold in "as-is" condition and may require minor repairs (like replacing battery clips or cleaning contacts).
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