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- The ‘Q’ of a Tuned Circuit
- The Phase Locked Loop
- Units of Measurement
- The dB
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- Lead Acid Batteries
- The Microphone
- Thoughts on the Magnetic Field in a Toroid
- Componants
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- 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
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- 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
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- Christmas Tree Lights
- Thoughts on the Magnetic Field in a Toroid
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- Home
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- The John Welsh Collection
- 2018 Contest Report
- The Dipole
- Aerials
- Aerial Gain
- Baluns
- Operating
- Aerial Feeders
- John Welsh – Menu Map
- Aerials for Circular Polarisation
- Earth Image
- Earth
- A Short History of Radio Part 1
- The importance of a good Earth at the Lower Frequencies.
- A Short History
- A Short History Of Radio Part II
- Off Centre Fed Aerials
- A Short History of Radio (Part lll)
- Analogies in Electricity Part 1
- Principles
- A Short History of Radio Part IV
- Analogies In Electricity Part 2
- A Short History of Radio (Part V)
- Transmission Lines
- A Short History of Radio (Part VI)
- Lead Acid Batteries
- A Short History of Radio (Part Vll)
- The Microphone
- Christmas Tree Lights
- Thoughts On The Moon
- Other
- The Evolution Of Morse Code In Radio Science
- The Thermionic Diode
- Slow Morse (Part 1)
- Inductors
- QRSS – Noise (Part 2)
- QRSS (Part 3)
- Capacitors (Part 1)
- Capacitors (Part 2)
- Coax – Does Size Matter?
- Monopole and Earth Image
- SAQ
- Aerials and their Q
- Tesla Etcetera (Part 1)
- Wave Polorisation (Part 2)
- Historic Electronics
- Tesla Etcetera (Part 2)
- Wave Polarisation (Part 1)
- Tesla Etcetera (Part 3)
- Solid State
- The Transistor
- The Sun
- Propagation
- Coax Impedance Calculations
- Tesla Etcetera (Part 4)
- Coax Impenance
- The Semiconductor Diode
- Scale; Some Numbers
- Remote Radios
- The Electron
- Coax Impedance – Power
- “Wooden construction”
- The Measurement of Earth Resistance
- A Crystal Set
- Transmitter Impedance
- Resistance of the Water Main
- Useful Filter for MF Listeners
- The Dimmer Switch
- Extreme Radiation
- Skin Effect
- Thoughts on the Magnetic Field in a Toroid
- The Klystron
- Derivation of Impedance for Minimum Loss
- Extreme Radiation
- The Impedance of Free Space (Part 1)
- Resistors
- Componants
- Impedance of Free Space (Part 3)
- Standing Waves Part 1
- The John Welsh Collection
- The Impedance of Free Space (Part 4)
- Thoughts on the Magnetic Field in a Toroid
- Detailed mechanism of E-M radiation from a wire
- The Impedance of Free Space (Part 2)
- Standing Waves Part ll
- Are you getting out? The Sniffer Box.
- Low Frequency Aerials
- The Triode valve
- The dB
- Traps In Aerials
- Loading of Aerials
- The Thyristor
- The Magnetron
- Units of Measurement
- Magnetron addendum
- Shortening the dipole
- Addendum to the article on the Klystron
- Another experiment on Shortening the dipole
- Ionospheric Refraction
- The Phase Locked Loop
- Ferriteless Toroids
- Atmospheric Attenuation
- Epitaph
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