The angle for the lower set of guys would be the most relevant and I'd be surprised if the upper set(s) of guys couldn't live with that, but if it was really an issue he could probably put the equali
I like to homebrew my projects to save money as well, but the thing that nobody seems to consider is that a non-engineered tower installation (either a standard installation that doesn't adhere to th
Those are all very good comments, which is why I think it is unreliable for anyone here on the reflector to encourage him to do much of anything specific, short of having an engineer check out his pr
I also don't understand the seemingly single-minded fascination with coax stubs. It takes more than one stub to get the same attenuation that a properly designed lumped element filter can provide, th
Certainly. Why would you think otherwise? You just need low loss components. Air wound coils would handle high power easily, but it's a bit trickier to find capacitors that handle high RF current. I
Hi, Steve. Depending upon the composition of the rock, you're probably looking at roughly 3,500 to 4,000 pounds for each rock. That's going to take a lot of rock splitting to reduce them to chunks mo
Think of them as mechanical fuses ;) 73, Dave AB7E _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http
Well, there lots of things to question in that whole process, not the least of which was manually transferring a 30 foot long 100 lb mass from the boom lift to the tower 60 feet above ground with no
I'd be very worried that they would crack as they deform to an oval shape under load. I'll bet that's what you'd see if you put one in a vice and squished it. The areas either side of the weld are li
Hi, Steve. I've done EZNEC analyses on antennas like that in the past and from what I remember the maximum lobe gives only about 2 db improvement. That's not trivial for DX, but I'd be surprised if i
The REAL Swiss Army knife for antenna modeling would, in my opinion, combine the terrain analysis of HFTA with the antenna modeling capability of NEC .... and do it for both transmit and receive. I r
No ... it doesn't really have anything to do about propagation reciprocity through the ionosphere. It is all about non-symmetry of terrain. As a simple example, picture a tall distant peak with a sho
I suggest that you do two things: 1. Read the extensive discussion of terrain interaction in general and HFTA in particular in the ARRL Antenna Book. 2. Generate some sample terrain plots see for you
How exactly do you or KT9OM expect Steve to moderate the list (and history has shown that he does indeed need to monitor the list for relevancy and decorum) if postings are in Spanish (or any other l
The last time this topic came up somebody made the distinction between positive and negative lightning, so I did some Google searching on it and found a ton of information on it ... most of it pretty
What spacings are you considering? In other words, 6 inch spacing between wires for a cage would give you approximately the equivalent of a 7-8 inch diameter cylinder, while 6 inch spacing between wi
You may get a couple of answers from this reflector, but I think you'd have more luck by just doing a Google search for "Optibeam" and "OB4-40" and then contacting the folks who show up in the result
Instead of trying to base your decision on a bunch of anecdotal advice, why don't you use HFTA to evaluate various heights on your bands of interest for the signal paths you are primarily interested
I don't own a SteppIR and have no direct experience with them at all, so my comment here is general in nature. About a year ago, out of curiosity I scanned through a very large informal sampling of p
Somebody who wants a tower? Then, of course, there is always the possibility that, for one reason or another, the house was built after the tree was already pretty tall. Dave AB7E ___________________