Its 40M Antenna Test Time!

With the cancellation of 3Y0Z, I went out back and took down my two temporary antennas that I had up for Bouvet – the 2 element 20M yagi and the 40M doublet – which is a 17M EDZ. This morning I swapped the MFJ-1886 with the NEW Wellbrook ALA1530LNP. Tomorrow I will also re-arrange my station a bit. I will be using the Elecraft…

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…

The Zig Zag

I have a 36′ vertical just laying on the ground, and I could easily bolt it to a fence post 36′ away from the 41′ vertical and have it line up with Bouvet nicely. It does look like  phased array on a few bands . . . And EZNec says it might be better on Top Band. Just something to think about . ….

RLC Low Pass

RLC Low Pass Circuit From Wikipedia: A low-pass filter (LPF) is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. The exact frequency response of the filter depends on the filter design. I’ve incorporated the circuit into my schematic: This is going to be very easy to install and wire up – I can’t wait to test it out! I’m finally going to have…

80M LC Circuit 

It was easy to get the LC circuit to work, as I have two excellent components. The roller inductor is a Palstar inductor and the variable capacitor is from an Ameritron ATR-30 where I had to constantly fix the edge wound roller inductor, so I junked it and am using it’s parts. They both fit at the top of the box and will easily…

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…

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,…