80M LC Circuit Added

The 80M circuit is now in Position 1, 30M is Position 2, and 160M is Position 3. I no longer need the Palstar AT2K – the SPE ATU can now handle 160, 80, 40, 30, 20M with the Inverted L. However, I’ll leave it inline just in case – I might want to use the Inverted L on another band when 3Y0Z fires up…

Calculating the 80M LC Circuit

I was able to find an online calculator that will give me the circuit components for an 80M LC tank circuit: http://www.ham-radio.com/lc.html I happen to know that my Palstar roller inductor goes up to at least 20 uh, and while my giant Palstar variable capacitor goes up to 450 pf at 4.5 kv, I’d like to try to use a smaller E.F Johnson variable…

Multiband Antenna Switching

When I first started on this project I think my goal was to “magically” handle SWR on several bands and my area of focus was on using an UNUN or Current Choke to do so. They did do what they were supposed to – to a point, but there was no “magic” there. They did bring the match “close” to the range of the…

Mission Accomplished!

The switched transformer Inverted L matching circuit works as designed. The biggest take away is that now I can run full power on 80M, which was the biggest challenge. This morning I woke up, came out to the shack and did one last test and found that the 160M position was not isolated when I was switched in position 1 and 2 – so…

KY6R Inverted L Switched Transformer Match

I’m very pleased to have it all wired and working. My original plans did have a logic – wiring bug – the first relay really needed to be in a default NC mode (no power), and I needed a third voltage line to activate it to be in the 1:1 current choke – or direct feed to antenna mode. I tried to get away…

KY6R Inverted L Switched Match Wiring

I worked up the wiring plan for the relays and UNUN / Current Chokes. There will be 3 wires needed to control everything. The control wire is already in place. Next up is to lay it out and wire it up.

Control Box Redux

I’m re-working this old control box and re-purposing it for my switched UNUN / Current Choke project. I found that the traces on the 2 pole 4 throw rotary switch – that is soldered into the PC board would require too much work, so I am going to remove the PC board and just use  new switch there and a new SPST switch for…

AD5X 160-10M 41′ Vertical Matching Solution

Ed, AG6CX reminded me of a QST article written by Phil Salas regarding a 41′ vertical that can be used on all bands 160 – 10M. Its funny, but I actually had purchased the same MFJ airdux style coil several years ago, and its sat unused in my big junk box. Well, actually, I have occasionally used it to play around with matching circuits. Luckily,…

Updated KY6R Switched Matching Circuit

Per Ed, AG6CX’s suggestion, I’ve moved the 1:1 current choke so its the input for all paths in the switched circuit. Another 1:1 current choke should be added behind the tuner. It simplifies the circuit – two relays can be eliminated. The main thing I wanted was to make sure there are never two incoming feeds attached to the vertical and ground at the…

Switched Transformers (Great Input from Ed, AG6CX)

I met Ed at Pacificon this year, and he has built some very nice matching devices and also shares a love for Johnson Viking Matchboxes. Our discussions have really helped me learn, and more than just getting some validation on things that I am experimenting with – our discussions help push me forward in the learning space. I have also enjoyed such conversations with…