If it's a question of law, I'd consult a lawyer. If it's about buying and selling, a realtor. (Keeping in mind that realtors by default are working for the *seller* and their income depends on making
On the contrary, I am glad that a knowledgeable ham attorney is reading and contributing to this list! If you don't care for the advice offered, you don't have to follow it. But if you disregard your
http://workmanship.nasa.gov/wppr_wc_rfcc.jsp : "Bend Radii for Completed Interconnecting Cable or Harness Individual coaxial cable, Optimum Bend Radius (10x OD), Minimum Bend Radius (6x OD)" So, avoi
TowerTalk people know a lot and have opinions on even more, so I thought I'd risk the following. I need to run Ethernet "CAT5" (or better) wire on an outdoor wall. I have PVC jacketed Belkin CAT5e ca
Quick answer is no. The electric and magnetic fields on ladder line extend out to several times the wire spacing. (Out to infinity, actually, but maybe 3 - 8 X for practical work.) Anything inside th
Chas, A little math shows that 5.5 Amps rms into 50 ohms is 1.5 kW. My handbook says the DC "fusing current" of #26 copper is 20 Amps. RF skin effects increase the resistance (perhaps by 5X at 10 MHz
You're right, of course. But I was only off by one in the exponent... :-( -mse -- Martin Ewing, AA6E Branford, CT _______________________________________________ _____________________________________
I'm not buying that! Current flow depends on impedance, R+jX, not radiation resistance. Your short whip runs at high voltage and low current. There is lots of current in the matching network, but lit
When I said a short vertical, I meant electrically short, i.e. << one wavelength (and also << 1/4 wavelength). Such a monopole above a ground plane always presents a high impedance, and it's mainly c
Not to belabor this (and we're stretching the limits of "towertalk" here)... FWIW, a quarter wave is not "short" in my view. I calculate (using the L << lambda approximation in Johnson's Antenna Engi
Ladder line does not "radiate" if the current is well balanced. If your balun is good and your antenna is in "free space", that should be the case, but nothing is perfect. Regardless, you would not w
Inquiring minds want to know: why is 2000 ft scarier than 20 ft? More time to think on the way down? Morbid humor, I know, but it's something I consider when I feel a need to climb my 20 ft roof moun
Resonant with Q=0 if you like. I think N5OT had it about right. What matters is what squirts out. It happens that using resonant conductors is usually the most efficient way to squirt. 73 Martin AA6E
These discussions are useful because they bring out some important concepts (and mis-concepts) around antennas and tuned circuits. Another way of thinking about dummy loads: Any practical two-termina
The folded dipole will have wider bandwidth than a simple dipole, because of the wire separation (and maybe other reasons). The big advantage in the old days (and now if you want it) is that the impe
I ran a B&W terminated dipole for years, and got some useful results. (when there were sunspots) However, it has a gain of something like -6 dB, depending on frequency. I.e., about 75% of your power
In an off-line discussion, we were talking about building a folded dipole out of twin lead or ladder line. Some folks may have the idea that if you build an FD out of 450 ohm ladder line, you get a 4
Steve, Thanks for pointing this out. Adding more elements to a system adds degrees of freedom that can add complexities to the analysis. My claim that the currents in both wires are equal was obvious
My vote would be #2. Coiling transmission line is fine as long as there is no coupling from turn to turn, ie. fine for coax. For open wire, if you coil tightly, each wire will "see" the wires in adja
References to W9CF and W5DXP info would be helpful. (Googling fails this morning.) 73 Martin AA6E _______________________________________________ _______________________________________________ Tower