160M: CQ WW Bust and Busted

From Page 6-8 of the ARRL ON4UN LOwband DX-ing Book Today I will nail the new LC circuit for the Inverted L. There are 14 combinations that I can try, so it could take a couple hours to finalize the LC circuit, wire up the u.RAT and button it all up. The ones that have one L and one C in the diagram above…

Urat and inverted l

I now have the antenna in this configuration (128 feet total length), and also have the u.RAT ready to be set into it’s waterproof box and wired up. The fancy schmancy u.RAT control console  Because I have a shorter antenna with the far end up off the ground, 160 tunes well, but 80M now tunes at a 3:1, so I will probably have to…

The u.RAT Rides Again!

The u.RAT will be put into service – now that I have switched to the Grounded Loop / Inverted U low band antenna On the left, the Spiderbeam aluminum mast used as a vertical – with Alumox between each joint, plus two hex head socket bolts and the clamps that came with the mast. On the right – 41′ of DX Engineering aluminum –…

Inverted U Matched on 160 and 80M WIth Low Pass (??) Circuit

This low pass (??) circuit lets me get on 160M CW and 75M SSB with very low SWR and no tweaking. I would need to tune when going down to the CW portion of 80M. The Variable Capacitor is a Palstar C600 and the Roller Inductor is a Palstar RI-28. I tried quite a few different L circuits (all of the 8 documented in…

High Pass T Circuit

High Pass “T” Coupler Circuit from http://www.w0qe.com/Papers/Antenna_Tuners.pdf Trying to get 4 bands 160 – 30M (and maybe even 20M as a bonus) is tricky with a 2 component L circuit, so I will follow Larry, W0QE’s lead and start with a High Pass “T” circuit – which gives great range at the sacrifice of a little loss. I plan on trying to find one position…

Steps to the Son of Mod Bob . . .

I have three aluminum elements up for the Mod Bob and will take down the center element: I already have a coax cable running from the Array Solutions switch you see to the left that goes all the way to that far element. The outside elements have the wire attached and it comes down to the center via a cool resin plastic (DXE) guy…

Benefits of Son of Mod Bob

There are several things that will be big benefits from Son of Mod Bob: I will remove the center element which is way to close to my 40M vertical array. This will eliminate the distorted 40M pattern I will no longer turn on the Trane HVAC when I transmit at full power I get three antennas in one, a half square on 40, Inverted…

Son of Mod Bob!

Son of Mod Bob! Page 14-7 from the ARRL ON4UN Lowband DX-ing book Chapter 14 in the ON4UN Lowband DX-ing book is a gem. John shows how to take a 40M half square and feed it just like the grounded loop – and where it then is a close array on 80M with gain. The dimensions in the book call for 72′ wide and…

The Grounded Loop Antenna (Thanks Jan, OM2XW!)

The feed is a simple L-C circuit, left, and the antenna can be switched between being an Inverted U or Grounded Loop, right Jan, OM2XW, wrote and reminded me of an antenna that is in the ON4UN Lowband Book, and one I have never tried. AA7OK has a VERY nice write up with great references at his web site – http://litlisten.com/aok/ As I understand it –…

Hacking Electronics, 2nd Edition

This is another superb book by Simon Monk, who has the best approach to teaching electronics that I have ever seen. I’m going to walk through each of his projects and use my oscilloscope to measure voltages at various points in each circuit to see what is going on. He covers both Arduino and Raspberry Pi, but also covers how discreet components work and…