Has anyone used the HFTA program and can tell me the best height for a 15 meter yagi for 6000 miles. Assuming there aren't any hills obscuring the take off angle. The carribean is about 6000 miles fr
It all depends on the terrain surrounding your station Bob. HFTA takes your terrain profile and provides a "figure of merit" given your antenna gain and height. You can move the antenna height until
What you need to look at is the arrival angle statistics, and there's charts for that. _______________________________________________ _______________________________________________ TowerTalk mailin
Here's the antenna book data for LosAngeles to EU (LA to Paris is about 6000 mi). It looks like you want an angle around 3-5 degrees, and maybe a bump around 8-10 degrees. These numbers come from VOA
6000 miles from CA to the Caribbean? Not on this planet! 6000 miles from your QTH in CA reaches to the Eastern tip of Brazil and a tad beyond. Try again with your distance measure. I agree with Guy's
Hi Bob, 6000 miles must be wrong -- did you mean km? I'm 3728 miles from KP. If you're near 38N/122W like qrz.com shows, you're closer (3600 statute miles) to KP (18N/66W). 3600 mi = 5800 km. vy 73,
Jim, I'll look and see if I can find some examples. I plan to dive into HFTA but I was hoping to have a better idea on this for the SSB contest that begins tomorrow. One thing I know for sure is that
looks like my distance I was using is way off, I'll digest this info and see what I come up with. Very interesting, I knew there would be suprises, hihi thanks Jim Bob K6UJ __________________________
yeah I was waaaaay off, hihi Bob K6UJ _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.cont
It's entirely possible that instead of optimizing your lobe you were moving a notch. Dave AB7E _______________________________________________ _______________________________________________ TowerTal
Unless you are on totally flat ground for miles around you'll need to run the Microdem program to import your exact location into HFTA to actually get the correct gain and take off/landing angle info
We contesters in FL, when opting for a second fixed antenna on the Carib, usually opt for a tribander at about 45 feet or so. Bill K4XS In a message dated 3/2/2012 6:06:18 A.M. Greenwich Standard Tim
If you really want to see some very dramatic effects, I have some from KH6 where it was absolutely imperative to do HFTA. Going south up a 13500 ft mountain I was on, even plotting with a 2000 ft tow
To get the main lob at 3 degrees the antenna would have to be 200' high (assuming flat ground). This is a poor choice since it leaves a big null at 7 degrees. I have had good results on 15m with a si
John et al All this may be true to some extent but the majority of us don't have the option of stacked HF yagis at 90' HI. I have never had an tower higher than 48 feet yet somehow have managed to w
That says more about what some people read into computer programs than it does about about "what some computer says is optimum". VOACAP is based upon empirical data and statistical analysis, and as s
which is an interesting point.. I think most hams have a "cycle time" for antennas which is shorter than a sunspot cycle. one might want to look at predictions for 5 years into the future (yes, specu
Sure, you can do the same with your mobile station. The original question however asked for the optimum. 73 Peter, DJ7WW I have never had an tower higher than 48 feet yet somehow have managed to work
John et al All this may be true to some extent but the majority of us don't have the option of stacked HF yagis at 90'? HI. I have never had an tower higher than 48 feet yet somehow have managed to w
This is the best argument I have yet heard on why the best available may not be good enough. If it requires an exceptional understanding of the physics behind it to understand why it is not providing