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…

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…

Low Band Grounded Loop

The ARRL told me that they do not plan on continuing to update this book with new revisions. If you don’t already have it – you really need to order yours now – because it is already a classic.  More than ever, the combination of Low Band Antenna Experimenting and Maker projects is the cats meow in Ham Radio. I don’t even care so…

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…

First Stop on the u.RAT World Tour: EBARC in El Sobrante

I will be giving my first Maker – Ham presentation at the EBARC meeting this Friday: 7:30pm, Friday, August 11th, at the El Sobrante Library on Appian Way This will be my “warm up” for Pacificon, and several Diablo DXers will be on hand    

U.RAT Ready for World Domination!

The final part of this u.RAT “science fair project” is wiring the variable capacitor and roller inductor with a 50 ohm dummy load resistor and then attaching the Rig Experts AA-30 so we can see how tuning the components affects SWR and what the L, C and X values are. I have been playing with different “equivalent circuits” and using a 56 ohm as…

The u.RAT as an Educational Platform

What started out as a personal project – to use the Elecraft KPOD to control the Palstar BT-1500A, has turned into an educational platform that I can use to write articles and give presentations at Makers Meetups and Ham Radio Club and convention gatherings. I’m giving my first urat presentation at EBARC in San Pablo in just two weeks –  August 11. EBARC has…

U.RAT Video Wrap Up

Here is the full on video for the u.RAT: