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Amateur Radio Training
The Foundation Course
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The John Welsh Collection
John Welsh – Menu Map
Introduction
A Short History
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 Triode valve
The Klystron
The Klystron – Addendum
The Magnetron
Magnetron addendum
Principles
Analogies in Electricity Part 1
Analogies In Electricity Part 2
Scale; Some Numbers
The Electron
A Crystal Set
Wire Baluns (Part One)
Wire Baluns (Part Two)
The ‘Q’ of a Tuned Circuit
The Phase Locked Loop
Units of Measurement
The dB
Transmitter Impedance
Lead Acid Batteries
The Microphone
Thoughts on the Magnetic Field in a Toroid
Componants
The Transistor
The Semiconductor Diode
Capacitors (Part 1)
Capacitors (Part 2)
Resistors
Inductors
Ferriteless Toroids
The Thyristor
Aerials
Aerial Gain
The Dipole
Shortening the dipole – 1
Shortening the dipole – 2
Low Frequency Aerials
Off Centre Fed Aerials
Aerials for Circular Polarisation
Loading of Aerials
Traps In Aerials
Wave Polarisation (Part 1)
Wave Polorisation (Part 2)
Monopole and Earth Image
Aerials and their Q
Radiation from a wire
Feeders
Aerial Feeders
Coax – Does Size Matter?
Coax Impedance – Power
Coax Impedance – Loss
Coax Impedance Calculations
Skin Effect
Standing Waves Part 1
Standing Waves Part ll
Transmission Lines
Earth
Earth Image
The Measurement of Earth Resistance
The importance of a good Earth at the Lower Frequencies.
Operating
Are you getting out? The Sniffer Box.
The Evolution Of Morse Code In Radio Science
Slow Morse (Part 1)
QRSS – Noise (Part 2)
Back to QRSS – (Part 3)
Q Codes
Other
Atmospheric Attenuation
The Impedance of Free Space (Part 1)
The Impedance of Free Space (Part 2)
The Impedance of Free Space (Part 3)
The Impedance of Free Space (Part 4)
Resistance of the Water Main
Useful Filter for MF Listeners
Ionospheric Refraction
Extreme Radiation
The Dimmer Switch
“Wooden construction”
SAQ
Thoughts On The Moon
Christmas Tree Lights
Thoughts on the Magnetic Field in a Toroid
Epitaph
Contact
Site Map
The Impedance of Free Space (Part 4)
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Sun
22
May
2022
60th Anniversary Special Event Station - GB6VER
7:00 am
DDRC Rally, Stockwood Park, Luton, Bedfordshire
Click here to see all of our events.
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The 2021 VARC Antenna Shootout
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