KY6R “Post DXCC” Station

I’m back to the Elecraft K-Line, plus the DX Engineering NCC-2 and phased Wellbrook ALA1530LNP Imperium loops for receive. My 20M yagi has been replaced by this Cushcraft D40 rotatable dipole. I will do extensive A – B testing against the DX Engineering DV-40-P phased vertical array, especially with ZS6CCY. The Inverted L that has a special home brewed UNUN / Balun base switching…

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…

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…

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…

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…

The KY6R Inverted L Switched Matching for All Bands

Schematic drawn by KY6R using Circuit Lab – an excellent web browser based tool. I use the same relays as Array Solutions does in their gear: Deltrol 20852-81 12v 35a DPDT – $13 at Galco I went over the Rig Experts AA-30 SWR plot and found that on every band from 160-10M, one of three UNUN’s or 1:1 Curent Choke will keep the SPE…