I certainly agree with almost everything you say. I'd never trust a review from CQ Magazine, no matter who the author is, because CQ has no technical editing or safeguards. Do you think that N6BT's
I don't have any idea - I ain't a technical antenna guy. All I I can't recall what month and year that was, and I don't want to bother looking it up. I seen to recall it had a bit of hyperbole in it
Dielectric losses in typical coaxial cables do not contribute significantly to loss at HF. The primary loss mechanism is conductor loss. The reason various dielectrics might *seem* to produce differ
Of course it does. No one said it doesn't. The reason the power rating changes is some dielectrics have lower voltage ratings, and some allow the use of a larger center conductor for a given power.
I'd be interested in several thousand feet and some grips. I live near Macon Georgia just near I-75. 73, Tom W8JI W8JI@contesting.com ________________________________________________________________
What is a "controlled field concept"? What is considered "remarkable performance"? As I understand it, the Hex Beam has about 3dB gain. That seems reasonable and appropriate for a small beam antenna
You can bet if you see a guyed tower laying over like a "cut tree", something was wrong with the guying. Even a tower guyed at one level will fold and fall, if the guys are properly installed and ma
You should use as many radials as possible. They must connect to the tower. The feedlines and control cables must exit at ground level. The guy lines must be insulated. The coax shield can connect t
Hi George, I think "Ask the Doctor", in QST, gave an incorrect answer to the very same question you are asking. I *think* they said if you flattened the conductor, the resistance would decrease, but
There is no height limit for amateur antenna Jerry, just a limit where paperwork must be filed with the FCC (and FAA) telling them "hey I'm installing a tower" and have them bless it. They send you
The last thing in the world you want for an antenna wire is a woven wire. It is a problem for RF resistance (although I can't say how much of a problem) and most likely for overall life. The vast ma
Actually transmitters are energy conversion devices. Maximum available power capability that does not reach the antenna does not necessarily turn to heat. As a matter of fact a mismatch just as ofte
Woops, the results are correct but I described the impedance wrong. In this case the surge impedance of the network would be the geometric mean of the input and output impedance. Phase shift would b
I hope they do grasp the correct concept, then all the folklore about SWR and what makes transmitters and tuners hot will cool off. The only thing SWR does for certain, at least in the systems we ar
I'll second Phil's remarks. Just don't kink it! 73, Tom W8JI W8JI@contesting.com List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more.
I wasn't answering your question, because no one can answer it. The only answer is if it didn't blow up, it is probably OK. I wouldn't run a rig without an adjustable matching system into a high SWR
I think that sums it up pretty well, except to say voltage is generally limited by the operating Q of any resonant circuits (they can ring) AND the design of the PA. With class AB or A PA's in push
Even an FT1000MP, with all its annoying unnecessary keyclicks, takes a millisecond to reach full power. That's 1800 RF cycles to reach full output on the lowest amateur band. Things change slow in o
Use two or more color tapes on each cable if necessary, just like Steve suggested! All of my mess is color coded or I'd be totally lost. I start with NE (since all my antennas default to NE, vertica
MFJ sells a push-button step-attenuator (I designed it) that has 1 dB steps up to 81 dB. It uses surface mount components and 0.5% chip resistors on a groundplane double sided board with BNC connecto