Super Hoosier DynaLoop

The Radio Shack 0 Comments 11/25/2017 (This is a Level 1 Resource)

Construction and Description of a 160M loop antenna

Posted By: Uncle Brad (UncleBrad)

The Super Hoosier DynaLoop consists of four 35ft (average) utility poles buried an average of 5ft, 125ft LMR-400 from R&L Electronics, a 5KW-rated 4-1 balun, rope and marine-grade hardware (mostly from EBay) and a 20ft length of 300ohm ladder line..  The closest pole is nearly 100ft away from the shack.  The poles are 140ft apart.  The antenna is far away from any power lines, and occupies the back 1.5 acres of my property.  Note that one pole was a bit short, so had to be built up with a treated 2X4.

The basic plans for this antenna has been copied and posted in many places on the Internet, but here is one reference. 

To achieve resonance where I needed, the math-derived 558ft proved to be way too long; the actual length was trimmed down to something close to 610' (in all my years of building wire antennas, I've never found correlation between theory and operation.)

There are clearly a complex multitude of primary and secondary resonances in this antenna with the balun.   Automatic antenna tuners just will not work reliably.  I attempted to hook up an MFJ remote tuner on the pole, but gave up: it was too easily confused.   I currently use a vintage, beefy Heathkit SA-2060A on the shack side, knowing that I'm heating up over 100 foot of coax.

The performance is generally good, and noise is quite low.  The arrangement works well with the excellent Acom 1010 amplifier at 750W, but I'm reluctant to push it to legal limit with my manly Heathkit HL-2200 (despite the theory.)  I'm now able to work most AM traffic in Wisconsin and Michigan, with was nearly impossible on my end-feds.

You will need a competent contractor, four utility poles and a skid loader with an auger.  It's tricky to manipulate the long, heavy poles with a such a small skid loader, but it can be done.  Bring chains and a few extra pairs of hands for help.

Use the best stainless hardware and rope you can find, and change out the rope every couple of years, because you don't want to have to climb the poles.  Total cost for me was around $1200, but I was lucky; it isn't always easy to find resources like this.  But with a little bit of maintenance, I should never have to worry about competent antenna options on the lower frequencies again.

   For over nearly five years, spanning 1978 - 1983 I worked as an Electronics Technician and the original Bearcat manufacturing and service facility in Cumberland, Indiana.  Electra was one of the best places I've ever worked, and were among the many innovative consumer electronics companies which sprang up in and around Indianapolis.  Al Lovell, a former employee of Regency (also in I...  READ MORE
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NB9M Studio C Installed

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(Shown: 1/7/2018 checkin with the DX-60 Net on 3880, using the DX-60/HG-10B/HO-10 and the RME-6900)Using furniture-grade 5/8" plywood, simple tools and cold garage during Christmas vacation, I constructed Studio C, which occupies the south wall of the shack.  Exploiting a sturdy, existing cabinet with drawers that I've had since I was a kid, I devised a scheme to reliably handle the ...  READ MORE
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Remembering Fielden FarringtonAuthor, announcer and long-time CBS writer Fielden Ward Farrington was born July 4, 1909 in Clinton, Indiana.  He was my great-uncle; the younger brother of my grandmother, Thelma (Farrington) Stone.  Two weeks prior to his birth, his older brother Leo passed away with scarlet fever.  His father Harry, a talented carpenter, built the house in which...  READ MORE
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- Uncle Brad (UncleBrad),  08/04/2017 
   I picked these up at the 2107 Sturgis, MI AM Swapmeet, amidst a pack curious OMs.  What a find!  Jerry replaced the original transformer in the linear power supply with a new AL-811H transformer.  The cosmetic condition of these relatively hard-to-find Gonsets is astonishing.  There is one front panel scuff on the GSB-101, and a few inperfections in the cases (original pai...  READ MORE
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Category: Activities
Here are some pictures from the 5th annual event at the estate of W9DYV, Wes Schum.  This is truly becoming THE place to be for serious vintage communications enthusiasts.  Thanks to Nick Tusa, K5EF and all the others involved in the forums and hands-on workshops.for their participation, and also to John and Diane Voght, our hosts in the beautiful Storybrook Farm Bed & Breakfast. &nb...  READ MORE
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Cleaning & Maintaining Collectible Radios

Improve and stabilize your collectible without a lot of work!
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Cleaning & Maintaining Collectible RadiosIf you have found a treasure in reasonably good cosmetic condition, there is process to improve and stabilize it without a lot of work.Before you begin, ensure you have the best panels and other parts for your radios.  I use the best covers, knobs, meters and other components from donor rigs all the time. The fundamentals are the same as detai...  READ MORE
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