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Nick,
I just gone done grounding the rood rack on my Wrangler as well as everything else on the vehicle.
Chris Doering wrote: Nick, I just gone done grounding the rood rack on my Wrangler as well as everything else on the vehicle.
I have done more research on NVIS in the last 6 months than I would care to admit. Here is a really well done article (pdf).
http://www.oe3xec.at/wp/wp-content/uploads/2015/02/Philippines_NEAR-VERTICAL-INCIDENCE-SKY-WAVE-NVIS-PROPAGATION_1-0.pdf
Good read, Rick. This is another good one that I found: http://kv5r.com/ham-radio/nvis-antennas/nvis-page-2/
Both are good reads. Thank you for sharing. I'm curious of a test we might perform using a vertical antenna (DX) behind a mountain. We seek out the condition where DX no longer works and then try the NVIS.
Perhaps we can try something of this from two remote locations in Nov. on the HF recon.
Yes, testing NVIS in the field would be great. I am about to buy an Alpha antenna. I've seen it on youtube perform well with and without the NVIS element.
It would have to be stationary mobile though in order to have a horizontal element. I don't think a vertical antenna alone can do NVIS well. It would also be interesting to experiment with a dipole.
I am making a list of things to test on the HF Recon.
The vertical dipole made from hamsticks does work, we have used them in the past and I will be bringing mine to the Op.
A long stationary dipole works at base camp as demonstrated last weekend.
The bent over CB antenna needs to be tested again, I have my doubts about it.
A vertical will still get around things at HF freq more than VHF but never as much as NVIS.
This is one of the antennas on the picture with the Hummer, supposed to be for NVIS.
http://www.hilomast.com/antenna-systems/nvis-models/mobile-nvis-loop-antenna/
I like it because it doesn't need a lot of real estate and it's mobile. On the downside, I can't see where I could mount it on my Jeep. I don't have a rack and at least so far I have no plans for one.
Nick Bretz wrote: This is one of the antennas on the picture with the Hummer, supposed to be for NVIS. http://www.hilomast.com/antenna-systems/nvis-models/mobile-nvis-loop-antenna/ I like it because it doesn't need a lot of real estate and it's mobile. On the downside, I can't see where I could mount it on my Jeep. I don't have a rack and at least so far I have no plans for one.
Rick Bean wrote:It is a magnetic loop. I have one at home that i made for 40 meters out of copper pipe. It is about 5 feet in diameter. It worked ok, but was really finicky to tune.
Finicky is a friendly word for the Hilomast Antenna, it's VSWR is listed as "Less than 2:1" when tuned. For an antenna that has a built in tuner, that's less than optimal.
For the HF session planned for November, I think I will try my G5RV in Twentynine Palms, with a backup plan being an ATAS-120, but the later is not a good NVIS antenna.
