What happens to the swr and feedpoint impedance at the transmitter if a RESONANT dipole is fed with ladder line? Because there is no reactance at the antenna, I presume there is no reactance at the t
Is it not true that what we call an antenna requires a changing charge in order to radiate? Further, in order for the thing antenna to radiate, there must be an equal but opposite charge going on som
quality long Can someone explain the difference between 75 ohm aluminum shielded hardline and "plain old 75 ohm TV coax"? I was given two partial rolls OF 0.4 inch DIAMETER aluminum shielded, white c
I would very much appreciate receiving comments, both good and bad, concerning your experience with this antenna. I have had an unopened boxed one in the garage for almost three years and now I want
I have two questions about using a 70' crankup with a yagi as a vertical radiator for 80m & 160m. 1. Will Force type yagis (insulated from boom) provide top loading; could the insulated yagi actually
Just this morning there was a discussion in a local ham roundtable on the RadioWorks super80 Delta loop! The instigator said he was amazed how quiet (less noise) the antenna was while still making qs
Support our ARRL--purchase from them, "AC Power Interference Handbook"! ?? number of pages, but an inch thick. 2nd edition-2003 k7puc _______________________________________________ See: http://www.m
I took delivery of my new tower yesterday and with the help of Pete, N4ZR, and a neighbor who owns a front loader I now have it standing on the pad and plumbed up. Cranking this tower (HDX 555) from
I did a google search on "dump power" and got 149 hits including two of Tom's towertalk posting. Other hits ranged from John Deere's tractors to garbage dumps but at least two others indicated that i
A couple of years ago, in a telephone conversation with Mr. EZNEC, as an aside I mentioned to Roy that his program does not utilize Window's dual monitor capability properly. What happens is that win
-- Original Message -- I have difficulty in understanding or accepting the notion of "ground losses--...wasted power heating the earth, etc..." I have no problem with using a dc, ac, or rf resistance
Tonight I will be the presenter of the program at the Tacoma Radio Club. My topic will be antenna modeling (using EZNEC). I intend to include the results of a discovery that I made a couple days ago
got it What in the design and construction of crankup towers allows them to be free standing whereas the others requiring guying? Intuitively, it would seem that just the opposite would be true; or
is corners Then where does the other part of the "lift" come from when raising the elevated portion of the tower sections? k7puc _______________________________________________ See: http://www.mscom
into My experience follows: The stress analysis for my LM470 (70' motorized crankup), when following the footnotes, sentences, etc. indicated that the analysis applied to an installation to be in "m
I have been thinking of adding a 2 element tribander at the top of the second section of my 70' crankup tower. This would be at approximately 39 feet. I have read of the difficulties presented by the
For example, transmitting on a 20 meter beam while listening on a 15 meter beam. How great is the risk of damaging the front end of a receiver listening on one beam while transmitting on a second bea
EZNEC shows that this configuration is a barn burner for straight up propagation providing about 4 db gain over a single dipole and much attenuation at lower elevation angles. However EZNEC shows tha
Although I have ran hundreds of wire antennas with EZNEC, I am still a novice--usually variations of wire configurations rather than exploring the effects of various ground properties. I used the "re
Have any Towertalkians actually installed this huge antenna? Your comments will be appreciated)! k7puc _______________________________________________ See: http://www.mscomputer.com for "Self Support