John Welsh – Menu Map

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A Short History Of Radio
    Earliest Times
    Late 19th Early 20th Century
    Early Last Century
    Did Marconi really hear those Transatlantic signals?
    The Tuned Spark Transmitter
    The Coming of the Diode
    The Triode, the start of modern electronics

Historic Electronics
    Tesla Etcetera (Part 1)
    Tesla Etcetera (Part 2)
    Tesla Etcetera (Part 3)
    Tesla Etcetera (Part 4)

    Analogies of Electricity Part 1
    Analogies of Electricity Part 2
    Wire Baluns (Part 1)
    Wire Baluns (Part 2
    Transmission Lines
    Lead Acid Batteries
    The Microphone
    The Thermionic Diode
    Capacitors (Part 1)
    Capacitors (Part 2)

Solid State
    The Transistor

    Aerial Gain
    The Dipole
    Off Centre Fed Aerials
    Aerials for Circular Polorisation
    Wave Polorisation (Part 1)
    Wave Polorisation (Part 2)
    Aerials and their Q
    Monopoles and Earth Image
    Aerial Feeders
    Coax – Does Size Matter?
    Coax Calculations

    Earth Image
    The Importance Of A Good Earth At Low Frequencies
    Monopoles and Earth Image

    The Evolution Of Morse Code In Radio Science
    Slow Morse (Part 1)
    QRSS – Noise (Part 2)
    Back To QRSS – (Part 3)
    Q Codes

Christmas and Other
    Thoughts On The Moon
    Christmas Tree Lights

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