Discussion in 'QRP Corner' started by KD5TTZ, May 9, 2017.
Something like this? (LINK) Hustler Standard Resonators RM-80
Should be able to fashion some way to lengthen the 75M version to cover the CW portion of the band. Reasonably cheap, er...inexpensive.
I don't know how well it would work, but I would like to try and make a 80 meter coil for a vertical.
I've never made a coil before. Where would I start to educate myself on the construction on an 80 meter induction coil for a vertical?
I already have a homebrew buddipole, so hope to build upon that. Anyone have any ideas?
You may want to consider beneith the metal helipad but that would take some climbing and use of fall protection.
A 30+ foot fiberglass extending pole with a single wire, a loading coil with shunt feed at the base, and a magnetic welder's ground lug for the ground plane connection (if you can find bare metal).
What a location!
I have a Jackite 31' pole that I use for my endfed, its too long collapsed to fit in the helicopter.
I also have to keep in mind that if I set anything up on the helideck, I have to be able to remove it in less than 10 minutes.
When a helicopter is coming in we get a 10 minute call for a green deck, any longer than that and I will be in big trouble!!!
Here's a 30m vertical I used a few times on top of a steel water tank. The element is a 12 foot extending whip (Buddipole makes one); the loading coil is wound on some PVC scraps with 3/8" hardware; the mag-mount base has a PL to 3/8" adapter screwed into it. Since mag mount coupling is insufficient at HF, I used the legs of a 30m dipole clipped onto the adapter as radials. The whole thing collapsed into a small stuff bag. Put small magnets at the end of the radials to keep them from blowing around.
Have you tried loading up the helipad itself?