You will require a Junior Hacksaw and a crimping tool suitable for RG59 coax and a 5.5mm drill. Take a standard PL259 reducer suitable for RG58 50 ohm coax and drill out the center with the 5.5 mm drill. Now slice the reducer with the Junior hacksaw up to the threaded section, this makes the […]
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Author: Gary Gibson
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
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. […]
Cyclone Tracy 1974
The following is a scan of an article written by the late Pierce Healy VK2APQ in the now no longer published March 1975 edition of Electronics Australia Magazine. This article details the involvement of Amateur Radio in Post cyclone communications.
Using Cheap CATV 75Ω cable to feed Amate
RG6 type CATV cable is very cheap compared with price of RG-8 or RG-213 type cables normally used by the majority of amateurs to feed their antennas. RG 6 can be found at electrical wholesalers for as little as $40 for a 100 meter roll. The Beldon datasheets lists RG213 as having a loss of […]
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 […]