Albury Wodonga Amateur Radio Club
A friendly group of amateur radio enthusiasts
Are You Confused On How to Calculate Decibels? What is a logarithm ? The simplest definition of a logarithm is that of numerical result of a number raised to some power For example 10 x 10 = 100 can also be written as 10¬2 or Log10 (100) Note that in the statement “Log10” the base is stated with the number […]
Read moreFinding, solving and preventing intermodulation problems Simply put, actually too simply put, intermodulation (IM) products are interference. They are undesired interference to a desired signal from a destructive combination of transmitted… Read the complete PDF article here>
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 moreInexpensive VHF/UHF Band HAM Amateur Radio Modules DRA818V/U DRA818V or U is a type of compact wireless voice transceiver module based on RFIC and works in VHF or UHF bands. It integrates high speed microcontroller, high performance wireless transceiver IC, high power PA, audio process and squelching circuits. It provides standard UART interface which users can easily configure appropriate parameters […]
Read moreConfused? Essentially there is no difference, be it a Diplexer that has the capability to handle power isolating the RX, or the design allowing the split of the ports to handle power in both directions. To the purists, the definition stated in the linked site is correct, but in practice a device that either combines two differing frequencies to one […]
Read moreOf all the elements that affect the intelligibility of speech in telephony, bandwidth has been shown to be one of the most critical often neglected item in amateur communications. This article provides a good insight in the understanding of the requirements. Click here to download a PDF of the whole article>
Read more50 AMP Power Supply that won’t break the bank Available from many online sources, these switch mode power supplies offer high current capability and are so cheap, that they warrant investigation in the suitability as a radio shack power supply… Click here to download the article in PDF form> Rob VK2YMU
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 […]
Read moreRadio to Computer Interface Audio Conditioning Project This project allows automatic level control of audio going to and from any bridging systems, be it from a computer or even a radio repeater adjusting the audio from large variation in levels. The project became obvious as a must for any EchoLink system where the operator wishes to setup an RF link […]
Read moreAdding a Pan Adaptor using your computer and a Software Defined Radio, can be dead easy on some radios, with others requiring modifications to the radio, something that can be easy to do or the opposite. The Kenwood TS590S unlike the newer TS590SG does not easily lend itself to connecting a Software Defined Radio There are modifications that involve fitting […]
Read moreThis is the antenna for you guys who want to get on HF effectively, and haven’t too much space or cash to throw around. Actually, it’s a design from ZS6BKW (aka G0GSF), similar to the G5RV, but it actually resonates on five bands, (well 6, actually) and doesn’t rely on a tuner (ATU) to make it work. The design appeared […]
Read moreAs of 11th February 2017 the 3RAY 70cm repeater is now operational. We are monitoring the the performance of the battery with the load of two repeaters. Providing the battery holds up and there are no interference issues the repeater will remain active. VK2RAY Location Hume Weir Village
Read moreFollowing some substantial work at the VK2RAY site there are now new cavities and a 118.8Hz CTCSS Tone required to access the repeater also. Please adjust your radios to transmit a 118.8Hz CTCSS tone to access the VK2RAY Repeater. Frank – VK2BFC
Read more