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Well over 100 articles by
Lloyd Butler VK5BR have been published in the journal Amateur
Radio over the last 20 years.Amateur Radio is the official
journal of the Wireless Institute of Australia) |
List of
Articles by the Writer
The list as originally prepared by the CW Operator's QRP Club.
Material from these
articles on the Internet.
( Just click the item to bring up the
article.)
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 (An early article, recently included here)
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
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
(Another early article recently included here)
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
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
Transmission Systems
Modulation Systems and Modes of Transmission
Narrow Band VoiceTransmission
Experiments with Small Antennas Systems
Cross Field Loop Antenna for 80 Metres (PDF File)
THE VK5BR X2-X3 Small Dipole Antennas
Some interesting results in operating the X3 out of balance
Some Different Ideas on the EH Antenna & Common Mode Measurements
EH & X3 Antennas (As published in QRP Club Journal "LoKey")
Electrical Safety - On the Secondary Side
Some Historic Information
Early Background of our Telegraph Codes
Some Early Communications History of the Postmaster Generals' Department
The Transmission Section of the PMG 's Dept. in Adelaide
The PMG Adult Technician-in-Training Scheme
Some early radio history of the Department of Civil Aviation (DCA) in South Australia
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.
Lloyd is the Historian for the Adelaide Hills Amateur Radio Society (AHARS) - 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.