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Shack Sign

I do a lot of portable operating which always brings a small problem when I am operating from home. I’m a bit forgetful and tend to forget the simple things like my home QTH WAB square or locator and get them confused with some of my favourite portable operating spots. So, I’ve decided that it’s time for a shack sign. I don’t want any of the garish edge lit, laser cut clear acrylic signs that are quite common, I just want something simple that has my call sign, locator and WAB square on it.
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I’ve got an ever increasing noise floor at my QTH so I thought I would try an active HF loop to see if I can null out the worst of the noise.

I found a simple design on-line and used it as the basis of my loop. The original site unfortunately no longer exists but I did manage to save the design here. View full article »

Another part of my antenna experimenting equipment. A simple ugly choke for HF made with 30 turns of RG213 coax around a 4″ plastic pipe.

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I needed a 1:1 balun to use with my home brew doublet but I needed it to go between the ladder line and the SGC-230 tuner so it needs to have stud terminals on both the input and the output. I took a look around and decided that making one was the best option.

It’s made using 11 turns of figure 8 twin lead on two stacked FT240-43 cores. See the pictures below…

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QRO 1:1 Choke

I’ve been meaning to build a good 1:1 choke or line isolator for a while now and the parts have been sitting on the shelf for over a year. Well today I finally got around to it.

I chose to build something that would handle the full UK power limit (400W) with no problem and used G3TXQ’s excellent chart to select the best combination of core and windings.

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