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The Slim Jim Antenna

The Slim Jim Antenna

Does the Slim Jim live up to its reputation? There are those that swear by it or those that have serious doubts about its claimed performance. I have to admit I was in the second group. It is my understanding after a reasonable amount of research following many a Google search that the Slim Jim […]

What does your SWR meter tell you?

Probably the first question that should be asked is, what is SWR? Simply put, SWR is the ratio of the maximum voltage (resulting from the interaction of incident and reflected voltages along a transmission line)to the minimum voltage. In a correctly terminated line (that is where the load is equal to the characteristic impedance of […]

Ham radio assists in sea rescue

A sea rescue Amateur Radio Emergency Communications In July 2012 Mike Hall VK8MH took part in the Sail Timor Leste boat rally on board his highly modified Triton 24 Colleen, along with his crew, brothers Gary and Geoff and his daughter Kylie. Mike arranged for Scheds on 40 Meters at 07:30 and 16:00 daily for […]

Band Pass Contest Filters

Band Pass Contest Filters

Does your club participate in contests on multiple Bands? If it does you are very likely aware of the interference that can be experienced from nearby radios operating on adjacent bands. Filters can be purchased from numerous commercial suppliers; however a set of filters for each band will set you back many hundreds of dollars. […]

6DQ6 Valve Audio Amplifier

Using Paddyboard Construction   And a low cost step down transformer as an output transformer. This project started out to be a design using 12AX7’s and EL34’s, but when I went scratching through the junk box I could not find any EL34’s so decided to use what I had. With just a couple of modifications […]