This post will hopefully encourage you to experient with more aerials/antennas and try different types for your location! The delta loop is a full wave antenna that is usually fed with a 50-ohm coax via a 4:1 balun or 75-ohm matching section, depending on the build. Also, where you attach the coax will affect the… Read More »
Following on from George, GI4SJQ’s talk on coax and connectors, here is a chart of the more popular coax type and their loss. Also calculated is the dB loss and power out for 20W in over a 20m length, for both 145MHz and 435MHz. For comparison there is an additional column of price per meter… Read More »
I have had, over the years a couple of pairs of Pro Set 3 headphone. may be I have a big (physical) head or my ears are in the wrong position but the Pro set 3 sounded good but never fitted well on my head. The first pair sat around in the shack for a… Read More »
For those of you who have been following along our videos from the clubs Tuesday Night Lecture Series it has not got a lot easier. You can go to www.youtube.com/muarcmedia and that will bring you to our Youtube channel with all our previous lecture videos and much more content in the pipeline. Visit the channel,… Read More »
I bought a NanoVNA to properly measure the 6m/4m diplexer. The results were mixed: So, testing the 70MHz high pass showed that there was 22dB attenuation at 50MHz. Not too bad! I could try adjusting the coils for more attenuation, but there was no de-sense on the 4m radio So I’m happy to leave it… Read More »
I don’t have a huge garden for an antenna farm, so most of my antenna experiments are located in the attic. Also keeping the neighbours happy, and most importantly, the station manager happy, is a priority! I have several runs of RG213 and RG58 into the attic, but wanted to be able to use 4m… Read More »