Which is probably beyond a general interest or benefit. That is the best point yet! We arbitrarily assign a target impedance, with no idea what the system common mode impedance is. Desktop common mo
Hi Mike, The context of this was entirely "transmitter" RF cables, which also are used at times for receiving, and devices connected in the transmitting feedlines on the desk. The difference with coa
Very interesting concept. Someone really thought that out, and it appears workable at first look. It would probably make a great 1:1 single band VHF or UHF balun, unless I missed something. I see it
I see a problem now!!!! The only common mode issue would be if the center point of the elements, which is the common shields, does not sum to zero volts. Look at a 16.67 load at one element side, an
Herb, ADSL, which sounds like what you have, has carriers right up to mid broadcast band or so. The upper frequency carriers that go up above 1 MHz are the from the modem to your house, while stuff d
You normally won't need to clean it, just cut to size, fold the braid back if installation instructions tell you, and slide the connector on. Although less than safe, I clean mine with MEK when I ne
I use good end insulators, and bring the wire down from the end insulator without a splice. The end insulators are anchored to things that the Beverage cannot pull over. I use at least a dual loop o
Years and years ago, I headed enginering for a company that owned dozens of cable and MATV systems. Because of FCC regulations and proximity of some systems to airport flight paths, we tested a vari
None that I can see. I use the stuff available from auto parts stores without any issue. I use it on every outdoor electrical connection. _______________________________________________ UR RST IS ..
I see now. This is exactly the problem I have with Wireman stranded ~400 ohm ladder line. After a few years, if water gets inside, conductors rust through. Heat from soldering also seems to remove t
I do that with my MFJ-259. :-) Sweep a wide range and look at peaks and nulls, or use distance to fault. Dips repeat at 1/2 wave intervals. The firmware inside converts that to feet on distance to f
I've been running tests on splices and trying to find the most simple splice that is reliable. http://www.w8ji.com/splicing_antenna_wire.htm The problem with any traditional splice is exposure of st
That works after a fashion, but a reflection transformer works better. The problem is we ignore the accurate definition of balance and unbalance. There are very few discussions or articles that ment
Has anyone ever made any attempt to characterize the line at HF? A simple process like that would eliminate all speculation about RF performance, and make rational cost vs. performance decisions. Sur
Unfortunately there is no magic. The objective of a radial is spread the electric and magnetic fields out, so they are not as intense. The only real solution is to fill a large physical area of spac
By sweeping it with a carbon 250 ohm pot on one end, and a SWR meter on the other, we can find a resistance value that results in minimal SWR change. Then, by measuring pot resistance with a ohmmete
Ticks carry many things, some that doctors are not familiar with. Installing antennas in the woods here in Georgia, I contracted Ehrlichiosis from a Lone-star tick. I was very ill, like having the fl
Since the field extends outside the dielectric, all bets are off. Even if the strongest area of electric field is between the conductors, we really don't know the percentages of what dielectric are
Hi Guy, Good topic. Slow wave structures are more common in microwave. Anything that increases capacitance or inductance per unit foot will slow wave propagation. The formulas are 1/f*sqrt LC for wav
<<< In theory two parallel 600 foot Beverages even 65 feet apart should allow some additional enhancement if fed properly.>>> Only if staggered to allow end-fire. The myth close-spaced Beverages (or