Many articles by
Lloyd Butler VK5BR have been published in journals, including Amateur
Radio and OTN since the 1980's.
The site has been set up to display some of the material published.
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Many articles by
Lloyd Butler VK5BR have been published in journals, including Amateur
Radio and OTN since the 1980's. |
Test Measurements and Test Gear Noise Cancelling Introduction to the Superhet Receiver Application of Switched Capacitor Audio/Speech Filters Negative
Resistance Theory Single Coil Z
Match Small Magnetic Transmitting Loop Antennas Small Receiving Loop Antennas and Interfaces Transmission Lines & Antenna Matching
Measurement of Distortion
Waveform and Spectrum Analysis
Intermodulation Performance and Measurement
FM Deviation Meter
RF
Inductance Meter
An LF Antenna Bridge
An Experimental Q Meter
Heterodyne Sweep Generator
Transmission Line Balance Test Meter
Unwanted Coupling of Stray Signal or Noise
An Adjustable audio Filter System for the Receiver
Combined Speech LP and CW Filter in one I/C
A Wideband Variable Audio Oscillator uses a Switched Capacitor Filter
Lambda Negative
Resistance Dip Meter
Toroidal Core Single Coil Z
Match
Single Coil Z Match for
1.8 MHz
Single Coil Z Match Load Curves
Single Coil Z Match for
Higher Power
OTN article on Single Coil Z Match development
Efficiency of the Z
Match
Output Balance on the Z Match
Matching Load Range - Drop-Out for Certain Capacitive Loads
Loop for 14MHz and
21MHz
Loop for 2
meters
VLF-LF and the Loop Aerial
An Active Loop Converter for the LF Bands
The Active Loop Converter at VLF
Antenna Noise and Signal Cancelling at LF
Noise Blanking for High Q LF Loop Antenna
Receiving Loop Aerials for 1.8 MHz
VLF Ferrite Core Loop Antenna
VLF-LF Receiver with Resistance Tuning
Simple VLF-LF Regenerative Receiver
Transmission Lines - Measurement of their Characteristics
Measurements on Balanced Lines
The Merits of Open Wire Lines
Loading up on 1.8MHz Using the L Match
An Approach to Antenna Matching & Tuning (L Match)
Top Loading by Reverse Feed
An interesting idea to get high current running
at the top or end of an antenna wire
Transmission Line Balance Test Meter
Modification to meter to measure relativity of Longitudinal to Differential Current
Amplifiers and Amplifier Theory
The Transistor as a Voltage Amplifier
RF Power Amplifiers - Tank Circuits & Output Coupling
MOSFET Linear RF amp for HF
Output Impedance - Source Impedance - Load Impedance
Amplifier Noise
Unbuffered CMOS Inverters as Amplifiers - One I/C package TRF Receiver
LF Transmitting Equipment
LF SSB Modulator using Phasing Technique
HF to LF Transmit Converter
LF Power Amplifier
LF Antenna Loading and Tuning
Measurement of LF Antenna Resistance and Reactance
Power Supplies
Design of Regulated Power Supplies using Series Regulator Packages
Test Load for 20amp DC Power Supply
Zener Diodes - Some Interesting Characteristics
Radio and the early Direct Current (DC) Mains in South Australia
Transmission Systems
Modulation Systems and Modes of Transmission
Narrow Band VoiceTransmission
An Introduction to Fibre Optics and Fibre Optics Communications
Satellites of the World & its Facilities
Transmission of EM waves under water
Electrical Safety - On the Secondary Side
The Dangers of Electromagnetic Fields
Power Generation & Distribution
Repowering North of South Australia
Power from the Sea
Base Power Systems & interaction with Renewable Sources
Some Energy Plans for South Australia
Wairakei Geothermai Power Station, New Zealand.
Some Historic Information
History of Amplitude Modulation Broadcasting in South Australia
Early Background of our Telegraph Codes
Some Early Tele-Communications History including the PMG
The Transmission Section of the PMG 's Dept. in Adelaide
South to North Telegraph Line Australia
First Undersea Telegraph to the World
The early Phonopore, telephone over telegraph
Undersea Cable across Bass Strait
Cape Otway - Early history of Undersea Telegraph & Wartime Radar
Bi-Directional Amplification in Communication Lines
Early_Adelaide_CB_Telephone_Exchange
The PMG Adult Technician-in-Training Scheme
Department of Civil Aviation (DCA)
Some early radio history of the DCA in South Australia
A History of Parafield Airport & its Facilities
Some history of the AR7 Receiver in the Department of Civil Aviation
History of Leigh Creek & its earlyAirport Radio Installations in DCA
Early Mobile Radio at the Woomera Range
WRE Type 2 HF Transceiver - Instruction Handbook
WRE Type 2 HF Transceiver - Chassis Layouts
WRE Type 2 HF Transceiver - Circuit Diagrams
Before Valve Amplification - Wireless Communication of an Early Era.
Introduction of Talking Pictures
The Early Medical Induction Coil
The Eiffel Tower and its early Radio use
The old Narrow Gauge Railway Line and the Ghan
History of Amateur Operators Certificate in Australia
Lloyd has been the Historian for the Adelaide Hills Amateur Radio Society (AHARS) for a number of years - Here are some articles on the AHARS Internet site concerning history of the Club and its early predecessor, the Blackwood Radio Club.
History
of the Adelaide Hills Amateur Radio Society
The early
Blackwood Radio Club
Origins of the
Adelaide Hills Amateur Radio Society
The Lower Murray
Radio Club
The Lower Murray Club, commencing in 1976 in the town of Murray Bridge, is now part of the Adelaide Hills Club. However the amateur radio history in Murray Bridge goes back to 1924. Click here to engage the Murray Bridge Amateur Radio Story.
Some early history at Murray Bridge:
Train Wreck at Murray Bridge Station
Forced Landing of Guinea Airways plane at Murray Bridge
The Wireless Institute of Australia (WIA) has been a representative of Amateur Radio in Australia since 1910. (It is the oldest Amateur Radio Society in the World.)
Listed here is an early history of the South Australian Division of WIA from 1919 to 1980 written by Marlene Austin VK5QO/VK3EQO,, originally published in AR in 1985. and later assembled in digital form by Lloyd.
Also listed here is additional history of the South Australian Division of WIA from 1980 to 2004 and prepared in 2013 by Lloyd Butler VK5BR,