The List

A large proportion of material from these articles is now
                 published on the VK5BR Internet Site.
                    Relevant articles are marked #.

Test Equipment & Measurements

A Two Tone Test Oscillator
AR Mar 1983

FM Deviation Monitor #
AR May 1984

Wideband Variable Frequency Oscillator #
AR Mar 1988
(Uses a switched capacitor filter technique)

An Experimental Q Meter #
AR Nov 1988
(Corrected circuit for publication errors AR - March 1989) #

Measurement of Distortion #
AR Jun 1989

Transmission Lines - Measurement of their Characteristics #
AR Oct 1989

A few tips in the design of the Noise Bridge
AR Feb 1990

Another tip in the use of the Noise Bridge
AR Dec 1994

A Sweep Generator to plot the Response of IF Filters & IF Channels #
AR Apr 1991

Measurements on Balanced Transmission Lines using the Noise Bridge & SWR Meter. #
AR Jul 1992
(Also reprinted in USA journal Communications Quarterly, Winter 1993 issue)

A Test Load for the 20 amp Power Supply #
AR Jun 1993

A Dip Meter using the Lambda Neg. Res. Circuit #
AR Jan 1997

Intermodulation Performance and Measurement of Intermodulation Components #
AR Aug 1997

An LF Antenna Bridge #
AR Oct 1998

Antenna Matching

Loading up on 1.8 Mhz #
AR Dec 1985

An Approach to Antenna Tuning #
AR Jan 1987
(Theoretical approach around the L match)

Measurement of Antenna Loss Resistance
AR Feb 1988
(An experimental method)

Tank Circuits and Output Coupling #
AR May 1988
(Mathematical corrections AR Jul 1988)

Tests on the Compact Coil version of the 2 Coil Z Match
AR Dec 1990

Output Impedance, Source Impedance, Load Impedance #
AR Sep 1989
(An analysis of what these are really about)

The `AR' Single Coil Z Match
AR Apr & May 1993

The Two Coil Z Match with no Switching
AR Sep 1993

Tests on a Z Match for 1.8 to 14 MHz Inclusive
AR Aug 1993
In the Random Radiators column

Feedback on the design of the Single Coil Z Match
AR Oct 1993

Efficiency of the Z Match #
AR Aug 1993

Output Balance on the Z Match #
AR Apr 1996

Single Coil Z Match with Toroidal Core #
AR Mar 1997

The Z Match and Its Matching Load Range - An Inherent Drop-out with Certain Capacitive Loads
(How to fix this drop out region) #
AR Mar 1997
(Co-written by Lloyd Butler VK5BR & Graham Thornton VK3IY)

The Simple Z Match Tuner Simplified (Single Coil) #
AR Jun 2001 & Break-In (New Zealand) Jan/Feb 2002

Single Coil Simple Z Match to include 1.8 MHz #
On the VK5BR Internet site

Single Coil Simple Z Match for higher Power #
On the VK5BR Internet site

VLF-LF

The Active Loop Converter at VLF #
AR Jan 2001

Antenna Noise and Signal Cancelling at LF #
AR Dec 2000

A HF to LF Transmit Frequency Converter #
AR Nov 2000

An Active Loop Converter For The LF Bands #
AR Jul 2000

An LF Antenna Bridge #
AR Oct 1998

A VLF-LF Receiver - 10 to 50 Hz with Resistance Tuning *
AR Mar 1997

Bandwidth Control for the VLF-LF Receiver *
AR Jan1990

A Front End Tuner for the VLF-LF Receiver *
AR Jul 1990

* The above three articles were also reprinted combined in the USA journal Communications Quarterly, Winter 1991

VLF-LF and the Loop Aerial #
AR Aug 1990
( Also reprinted in Communications Quarterly, Spring 1991)

Experimental Communications in the LF Band
AR Aug 1990

A Ferrite Rod Loop Aerial for VLF #
AR Nov 1990

A Simple VLF-LF Regenerative Receiver #
AR Jan 1992

VLF & LF Techniques - Notes from Symposium presented at S.A. Kingston TAFE College 24 Jul 1993

A Bandwidth Limiting LF Converter
AR Dec 1993

Bandwith Limiting LF Converter with reduced component count
AR Jan 1994

Bandwidth Limiting LF Converter - Mods for extension to VLF
AR Mar 1994

An LF Antenna Bridge #
AR Oct 1998

An Experimental Low Frequency Band Transmitter #
AR Feb 2000
(Corrections Mar 2000 p.2)

A Single Sideband Modulator for the LF Transmitter
(The Phasing System of SSB Revisited) #
AR Sep 2000
(Corrections Feb 2001 p.16)

Noise Blanking for the High Q Loop Antenna #
AR Aug 2001

History

Before Valve Amplification #
AR Jul 1986

Mobile Radio at the Woomera Range #
AR Jan 1988

The Murray Bridge Story - Amateur Radio in one Australian Town #
AR Jul 1988

Lower Murray Radio Club #
(Part of the Murray Bridge Story - item listed above)

Background of Early Telegraph Codes #
AR Sep 1989

The Philips Code #
AR May 1990

The Blackwood Radio Club - The first Club in S.A. #
AR Mar 1990

Adelaide Telecom Museum Future in Doubt
AR Oct 1992
(The words of journalist Des Colquhoun are reiterated)

Origins of the Adelaide Hills Amateur Radio Society (AHARS) #
AHARS Newsletters Jan/Feb 2000 & May/June 2001

Noise & Noise Reduction

Amplifier Noise #
AR Aug 1985

An Interference Cancelling System #
AR Sep 1992

More on Interference Cancelling & a New Circuit #
AT - Jan 1993

Unwanted Coupling of Stray Signals & Noise #
AR Jun 1993

Some Further Notes on Noise Cancelling #
AR Jan 1997

Antenna Noise and Signal Cancelling at LF #
AR Dec 2000

Loop Aerials

VLF-LF & the Loop Aerial #
AR Aug 1990

A Receiving Loop for 1.8 MHz #
AR Sep 1999

Some Experiments with the Small Transmitting Loop Aerial #
AR Nov 1991
(Further notes in Jan 1992)

VHF Antenna in a Lunchbox - 2 metre Transmitting Loop #
AR Jan 1996

Also refer to VLF/LF section for VLF/LF Loops

General Theory

A Discussion on Mixers
AR Apr 1988
(Corrections Jun 1988)

An Introduction to the Superhet Receiver
AR Mar 1989

The Ladder Filter Revived #
AR Mar 1990

The Transistor as a Voltage Amplifier #
AR Apr 1990

Temperature Coefficient Correction in Zener Diodes
AR May 1990

Modulation & Modes of Transmission #
AR Jul 1991

The Merits of Open Wire Lines #
AR Sep 1991

Capacitors at High RF Power
AR Jan 1995

Negative Resistance Revived #
AR Nov 1995

Zener Diodes - Some Interesting Characteristics
AHARS Bulletin, March/April 2000

Miscellaneous

The TCA 1675/77 Transceiver used as a Linear Amp
AR Aug 1985

RTTY using the VZ200 Computer
AR Sep 1985

Morse Code using the VZ200/300 Computer
AR Jan 1986

Memory Expansion for the VZ200/300
AR Apr 1988

A Simple Speech Processor
AR Jul 1987

Spectrum Analyser Waveforms #
AR Sep 1987

A 28MHz Broadband Pre-amplifier
AR Apr 1989

An RF Power Linear using IRF Mosfets #
AR Nov 1989

An Adjustable Audio Filter System for Receiving #
AR Mar 1995
(Uses controllable switched capacitor filters)

Mods to the audio filter to provide an adjustable rejection band #
AR Jun 1995

Narrow Band Voice Transmission #
AR Jan 1999 p18
(Correction AR Mar 1999 p32)

A Receiver speech & CW filter using a single I/C #
AR Feb 1997

Design of Power Supplies using Series Regulator Packages #
AR Feb 1987

Underwater Radio Transmission #
AR Apr 1987
(Possible application in Amateur Radio)

Safety - On the Secondary Side #
AR Jan 1998

TRF Receiver - Uses One Only Active Package #
Lo-Key #65 p.12