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…

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…

Switched UN-UN’s for the Inverted-L

If it weren’t for 80M, I could continue to just use the Balun Designs 1:1 current choke at the base of my Inverted L. One way to make my Inverted L happy is to put a Vacuum Variable Capacitor in series to the vertical – and use the AT2K Tuner in the shack. Tune the capacitor remotely as I did the URAT. The second…

Inverted L High Resolution Plot

I have not taken a new plot with my Rig Experts AA-30 since I changed the antenna from more of a traditional Inverted L to this “inverted fish hook” configuration, so I decided to set the range from 1700 – 15000 khz and see if its any different than the old configuration: This the OLD plot – when the antenna was a standard Inverted…

160M: The Inverted “Fishing Hook”

My antenna now looks like some weird Inverted J or Inverted Fishing Hook (?). Its similar to the “AKI Special” antenna documented on page 9-72 of the ON4UN Lowband DXing Book. It is now 60′ tall at its apex, and then the wire trailing down skirts the very large Blue Spruce that its top wire is pulled up to. A year ago, the Diablo…

The RFI “Sleuth”

In the last year I made two changes to my antenna farm that introduced RFI issues. Not RFI in the shack, but RFI that I am causing that: Only on 160M I all of a sudden cause my Trane Heater blower to turn on and off for short periods – just enough to blow cold air through the house and make fan noise Turn…

High Pass “Tee” Network

The new KY6R Inverted L matching unit at the base of the antenna. It is the Palstar AT5K High Pass “Tee” circuit, and being at the base – while the extra capacitor might introduce some loss, having the unit at the base of the antenna most likely makes up for that. Larry Benko, W0QE, in his FB antenna coupler slide deck: http://www.w0qe.com/Papers/Antenna_Tuners.pdf On page…