Tag Archive: HF


TX audio chain

It started as a simple project to construct a switch box so I could use a single microphone with multiple radios in my home shack. It’s ended (although i’m not sure it will ever end!) with more knobs, buttons, switches and flashing lights that the flight deck of a Dreamliner.

I’m still experimenting and will be posting a walk through soon so stay tuned but for now, here’s a little picture…

M0LMK Audio Chain



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It’s been a while since I featured my FT-857 manpack on here and I’ve been using it well for over a year now so I thought I better show some sort of update.

So here it is. The FT-857 Manpack as it stands today…

The pack all ready for use…
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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 »



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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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