John Welsh – Menu Map

This collection is being added to weekly – keep an eye out!

Introduction
    Introduction

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)
    The Thermionic Diode
    The Klystron

Principles
    Analogies of Electricity Part 1
    Analogies of Electricity Part 2
    Scale: Some Numbers
    A Crystal Set
    The Electron
    Wire Baluns (Part 1)
    Wire Baluns (Part 2
    Transmitter Impedance
    Transmission Lines
    The ‘Q’ of a Tuned Circuit
    Lead Acid Batteries
    The Microphone
    Inductors
    Capacitors (Part 1)
    Capacitors (Part 2)

Solid State
    The Transistor
    The Semiconductor Diode

Aerials
    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
    Coax Impedance – Power
    Coax Impedance – Loss
    Skin Effect

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

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

Other
    Impedance Of Free Space (Part 1)
    Useful Filter For MF Listeners
    The Dimmer Switch
    Extreme Radiation
    Resistance Of The Water Main
    Wooden Construction
    SAQ
    Thoughts On The Moon
    Christmas Tree Lights
    Thoughts On The Mangentic Field In A Toroid
   
   
   
   

Secured By miniOrange