A friendly group of amateur radio enthusiasts
Wireless-X The Bible By Dewey L. Hee WB7OEV In his Prior life was a System Administration working for the Boeing Company. He became interested in Amateur radio while working for the Boeing company in 1972… He began to wonder what else he could do with the FTM 400 and discovered this mode called Fusion, (CFM) and got bitten with the […]
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 moreHow much fuel is in your battery? The best way to determine the state of charge of a battery A battery is a store of energy. It can be considered as a container of water that is either full or empty. With a water container it’s easy to determine how much water you have left in the container. Similarly on […]
Read moreAre 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 moreHave you ever wondered why a VHF signal will go further than an UHF signal? The law in physics states that the power in a radio wave will decrease by the inverse of the square of the distance. Click here to read the full article> Rob VK2YMU
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 moreThis popular condenser studio microphone is available for as little as $20.00 this includes the anti-vibration mount, audio cable plus a wind sock.
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 more