Mod Bob – Part 7

I’m still intrigued by the idea of the “Mod Bob”, but this time as a multi-low band broadside array. Having two 60′ verticals opens up some new possibilities. I did model the feed being at the bottom – or elevated as shown here – and the elevated feed above the ground 10′ wins by quite a margin. My radial field is not connected, but…

Mad Antenna Science Weekend!

Now that all the hardware (structures and wiring) is in, I can take some time to do some tests and experiments. Here is a list of things I will try with the two 60′ (18M) Spiderbeam Fiberglass based wire verticals: Tune the verticals for the DX Engineering phasing solution. Check to see if the radial field – as strange as it is works. Try…

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 –…

Inverted L vs. Inverted U vs. Mod Bob

Inverted U on 160, 80 and 30 and half square on 40M Just for laughs, lets compare three antennas that I could have – against what I have now – the “Mod Bob”. An Inverted L would be MUCH better than the Mod Bob. Its something I need to consider – because I could use the u.RAT to tune it. On 80M, the Mod…

Takeoff Angle Path Analysis on 160M for EU and 40M for ZS and 3Y0Z

Last night, when I saw quite a few spots between Washington State, Montana and parts of Oregon – where they were working EU and Scandinavia on 160M. I am getting excited because maybe we will get some of that here at Chez KY6R . . . I wanted to use Google Earth (Classic) and check to see which direction 10 degrees is – and…

Major 160M Opening

The most interesting part of this image is how much closer R1FJ, JW, JX, OX and TF look than on a flat map. In fact, they are not that much farther than FP was, which was my last new one on Top Band, and where FP was very loud here. This is a very good omen . . .  I’ve only been chasing 160M…

Pacificon 2017

I will be presenting during the Pacificon 2017 Antenna Forum on Friday, October 20, from 3:30 – 4:30, and my topic is “Low Band DXing Antennas”. I will start with a survey of all of the low band antennas that you should consider for DX-ing on the bands 160 – 30M, and I will include transmit as well as special receive antennas. The presentation…