Actually, for terrain purposes percent grade is much more typically used. You never see a road sign telling you there is an 8 degree grade ahead ... you'll see 14 percent instead. Percent grade is ea
That should work fine for a guyed tower where you have the ability to adjust everything once it's fully up in the air, but as I mentioned I was installing a free-standing tower where the base gets em
I use just such a hidden dog containment wire here on my property, and if I remember correctly the frequency of the low power RF (continuous, as N8DE states) is in or near the 27 MHz CB band. I live
Hi, Pete. I'm kind of sorry I even wrote my post now for the confusion it has apparently created, but just to clarify ... I was putting up a 70 foot AN Wireless self-supporting tower (model HD-70). I
I am now really, really, really sorry I brought all of this up. 1. I'm installing the 5 foot base section exactly as the manufacturer (AN Wireless) recommends. Check out the dozens of project photos
Not that I know of. I've never seen any deflection spec on the AN Wireless website, nor in the documentation I got for the tower. I bought the HD-70 model, though, and it is rated at 62 sq ft at 70 m
Three inches out of 100 feet also requires an accuracy of 0.3 inches for a plumb bob string hung from a 10 foot section of tower. Three inches out of 100 feet calculates out to be a total angle of 0.
Hi, Gary. The 4-Square model ("4square" for 40m) that came with my copy of EZNEC has simply a connection to average ground for each vertical ... no radials of any sort. The EZNEC model also shows sta
You can buy 3 inch or 4 inch diameter aluminum irrigation tubing in lengths up to 60 feet long from Rain-for-Rent on the south side of Tucson. I don't remember the address off the top of my head but
I wanted to make several Cadweld-type connections (#4 copper wire to 5/8 inch ground rod) for my tower ground system, and I since I had already obtained a bunch of the weld metal powder on eBay I wan
For about a year I used a 40m vertical loop with the apex at 55 feet, fed at the bottom and kite-shaped to give a 50 ohm feedpoint impedance. It was simple to support and worked well, and like all fu
How, pray tell, does using a quad versus a yagi have any effect on the attenuation of the signal after it leaves the antenna? Dave AB7E _______________________________________________ _______________
Agreed. I think the type of tree and the time of year must have at some effect on how lossy it might be. I had to cut down a large, live branch (full set of green leaves) of an Arizona White Oak here
The top hat tubes sound pretty unwieldy to me. You're going to need to guy the vertical section in a couple of different places anyway, so why not just make the top set of guys partially out of large
That's pretty much been my impression of this antenna. It generally gets rave reviews on eHam.net (doesn't everything?), but all you have to do is look at it to see a few obvious things: 1. Three fee
The formula for calculating the characteristic impedance of a parallel wire transmission line is readily available for the case where the conductor diameters are equal, but can anyone point me to a f
Thanks! I should be able to work with that. I'm trying to model a transmission line equivalent for decoupling stubs on a yagi element (wire suspended below tubing), and the characteristic impedance o
Could you please be more specific? What constitutes "serious quality problems", and what might be their rate of occurrence? Can you provide any links or references to those reports? Dave AB7E _______
I've played around with plumbing fittings to make connectors for 1/2 Heliax and several months ago back came up with the following. One of these days I'll write it up with pictures and stick it on my
I recently built and installed the exact same tower and can attest to it being really, really strong. In spite of its size and weight, I was able to completely assemble it by myself in two sections,