Tag Archive: HF


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…
20150501_194338
View full article »



Share on Google+Share on FacebookTweet about this on TwitterPin on PinterestShare on StumbleUpon

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 »



Share on Google+Share on FacebookTweet about this on TwitterPin on PinterestShare on StumbleUpon

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.

20140823_165714



Share on Google+Share on FacebookTweet about this on TwitterPin on PinterestShare on StumbleUpon

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…

View full article »



Share on Google+Share on FacebookTweet about this on TwitterPin on PinterestShare on StumbleUpon

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.

View full article »



Share on Google+Share on FacebookTweet about this on TwitterPin on PinterestShare on StumbleUpon
Powered by WordPress & Pengimo