Albury Wodonga Amateur Radio Club
A friendly group of amateur radio enthusiasts
Michael Harvey VK2JMJ December 2021 Theory: Antennas are basically a resonant element in the sky. That resonance can be obtained by a natural RF length or wavelength of wire. That length can be physically shortened or made to look longer at RF by adding inductance in that length. A combination of inductance and capacitance makes the element resonate. Read the […]
Read moreAnother successful Antenna Project from Rob!I want to share with my fellow Ham guys another successful antenna build for 70 cm the VSWR is less than 1.3:1. The only thing for me to do now is to polish the brass construction and coated and a clear sealant most pleased I am. I also wish to add everything except for the […]
Read moreWell this is my latest creation with help from Ross VK2DGY and Lloyd VK2KNS. The rod is an old fishing rod with all the fishing bits and pieces chucked off. Everything is been made by hand the only thing now to do is to check it for tuning. I must say that’s the scary part. It will work or it […]
Read moreUpdate! As you can see I’ve done some fancy work to my halo antenna as it’s now blue. There is also a photo of the metre showing how well it has been tuned with the help of the boys at the club meeting. Very much appreciated. Rob VK2MGM Some photos of Rob VK2MGM tuning his new Halo Antenna for 2 […]
Read moreHi to all. As we are trying to keep with the environment where I live as in I am unable to erect an antenna outdoors, I decided to use this little J pole antenna tuned for 70 cm. As you can see we turned it into what I call a Plantana and the SW are a spot on and it’s […]
Read moreA fun little project I did over a couple of days was making this little 6 element yagi for 70cm. There are so many designs and ways one can do this so after some reading of different designsand measurements I came up with this (photos below). I decided to go for a dipole driven element fed by a “Bazooka Balun”. […]
Read moreThe Portsdown Digital Amateur Television Project. This document covers the general layout, construction, assembly and setting up of Portsdown Digital Amateur TV system. Before starting in DATV it is highly recommended you read this document in its entirety to understand how the system operates and which hardware you will need. Download the PDF document>
Read moreAn issue confronting Raspberry Pi users is SD card corruption due do improper system shutdown. Ordinarily before removing power from the Raspberry Pi, one should execute the “sudo shutdown -h” Simple routine can be incorporated into the system, sensing either an operator shutdown or a power failure. Read the full PDF article here> Thanks to Rob VK2YMU for submitting this […]
Read moreIf you have had a look at the cost of a commercial BALUN, you will question if it’s worth the effort to make your own… it IS! Read the PDF article here>
Read moreRecently Rob VK2FAAA found himself with a few minutes to fill in. So he decided to make up a two metre quarter wave antenna. He scratched around in his shed and came up with the lid of an old barbecue which he used as the base. For the antenna he used old copper tubing that was laying around. The SWR […]
Read moreDigital Radio Hot Spot If you’re like me, deciding to embark upon the world of digital radio, confusion is likely to be the result, likely to make you abandon the whole idea, going back to what you know and understand. However the digital mode experiencing rapid growth is DMR, but like all the others, requires a radio that uses that […]
Read moreDIY Solar System For Your Home Back in 2013 I decided to install a home solar system to reduce the cost of electricity. I missed out on the premium export tariff. By 2013 the 60 or 40 cents per KWh where no longer on offer… Rob VK2YMU Click here to download the PDF and read the full article>
Read moreWith any electrical signals, being the transmission over wires or radio, or the process of converting analog to digital or for whatever purpose, this will require some form of signal conditioning. The reason is that the converting process creates problems either to obtain acceptable signal to noise ratio or signal linearity. With digital conversion of an analog system the technique […]
Read moreKenwood Microphone MC60A Modification – Another use for the SSM2165 The Kenwood MC60A with preamp, suffers from RF feedback, a search on the web reveals the extent of the problem. For the many looking for solutions to this problem. There exists an error on the user documentation, that shows the microphone audio wiring as reversed from one socket to the […]
Read moreSimple compressor limiter Some years ago I designed a peak limiter to achieve more speech power when using single side band transmission, at the time National Semiconductors made a compressor IC that allowed to adjust the centre frequency thus where the compression took place. This value of C was such that it accommodated the frequency range of 300 Hz to […]
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