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Trying on 6920 AM
Stretchyman:
Cool, no worries. Try a folded dipole low to the ground, the Z will drop and you'll get a decent swr. As long as you have a good take off you'll get fair NVIS. Let us know how u get on.Plenty of online SDRs now to test your metal!
EliteData:
trust me.
the urge to push more than 200-300 watts will eventually overcome your resistance to do it ;D
jackson_r:
--- Quote from: EliteData on November 30, 2015, 1045 UTC ---trust me.
the urge to push more than 200-300 watts will eventually overcome your resistance to do it ;D
--- End quote ---
Oh, I don't doubt. But as I mentioned in another thread here, that last thing I want to do is start blasting across the neighbor's baby monitor. ;D
I continue to be intrigued by the magnetic loop antenna option. I spent the better part of the weekend reading up on them and it's definitely something within my skill set to make. The way our backyards are clustered together, I doubt I could get away with mounting a 9' loop vertically. Even in the dark, it would look like some sort of UFO had landed in my backyard. But I've been reading that horizontal mountings can work as well, and that would be a lot less noticeable to the nosy nellies who live next door. I'm going to try the fence mounted dipole first. If that doesn't work, I'll consider the mag loop.
Stretchyman:
Make sure wire is 'insulated' from fence, wood gets wet and antenna would perform poorly.
Optimum NVIS height is only 8'.
Yes I've been looking into loops as most folk TX on a fixed Freq, make the ideal antenna using a vacuum (fixed) 100pF cap and 22' loop, should give me close to 6.4MHz resonance.
Mounting horiz, you really want to get some height but as you really after NVIS? I guess mounting low may be fine?
Have fun experimenting!
With the wealth of online SDR's it's easy to see if it's working!
Stretchy.
EliteData:
with my testing and experience through the many years, if youre going to mount a horizontal dipole, i find that 30 feet above ground with at least 10 feet from absorption obstacles seems to be at the minimum threshold for optimum performance but not everyone can afford this luxury.
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