Agreed. The topic here is "back of the desk grounding", and in that location a massive copper busbar is a big waste of money. Worse still, it may indicate a dangerous lack of understanding. The plac
by too kind The story about "molten" CATV cable sounds like someone connected it to the 115/230V AC mains. half you out of Here you go... <http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#0904> To
That's very close - the cause of the distortion is a non-optimum load line. Most of us are familiar with the idea of drawing a 'load line' on the characteristic Va/Ia curves for a tube amplifier. Ex
biggest easier with a edges That tradeoff isn't universally true. It may well be true for HF Yagis because of the relatively small number of design variables (element lengths and spacings) that are a
The idea of inserting an extra director very close to the Driven Element has been independently discovered several times. One of the first to specifically recognise that this extra director can help
I'd agree with K9YC and N6RK that heating of the choke toroids is not the issue... but your remark about "RFI from 6m" raises a warning flag. A yagi on a tower should never be a particularly tough co
This is how it should be done, with Swiss precision. <http://tx.mb21.co.uk/gallery/gallerypage.php?txid=840> These are photos of conversion of a British TV tower for digital TV. In Parts 1 through 4,
went SteppiIR "home" It could have happened exactly as described. If the signal from the M0 station was arriving in a deep null in the vertical pattern of the higher antenna, then passive coupling w
tiny the That's correct. Routeing the RF control signal along the coax will deliver far stronger signals than an over-the-air link, which wastes almost all the signal power in unwanted directions. I
For remote control of a Beverage antenna selector, N4ZR has had good success with sending the 300MHz control signals out along the same coax that carries the incoming 160/80m signals. That same coax
Sorry, Rick, photographs of the Versatower lock plate on the web seem hard to find. There are verbal descriptions on GM3WOJ's information pages, <http://www.qsl.net/gm3woj/latticetower.htm>. Scroll d
would this side of Versatowers have only one locking device, a simple flapper plate at the top of the lowest section. The second section rests on this plate to take the strain off the winch cable af
There is a better way to use Coax-Seal, which the makers don't tell us because it uses only a very small amount per connector. The one good place to use Coax-Seal is to fill the small gap between the
other antenna fatal It obviously isn't a fatal problem, but taping a coil of coax directly onto the boom will always UNbalance the antenna, more than balance it. If you use a ferrite balun for the b
All true; and with a well designed ferrite-loaded choke it is exactly the opposite. A common-mode (choking) impedance of several kohms can easily be maintained across a 2:1 frequency ratio. The big a
A fair point :-) But it's also fair to ask: "How long ago did your friends have problems, and which SteppIR antenna was that?" SteppIR have made many improvements in product quality over the past 12
itself to some zero If these be a warrants the Can it be that some parts of www.g0ksc.co.uk and www.innovantennas.com are failing to load in your browser? These are two different websites. g0ksc.com
know much a largely The radiation pattern of a Yagi is determined by ALL of the elements, including the driven element itself. As a volunteer editor for the German-English VHF/UHF magazine DUBUS, I
I like many others was in this situation. After weighing up the pros and cons for what seemed like an age ie: price, performance, wind load, reliability, resale value should I upgrade, longevity and
I put my jack under one of the rails, so I am not trying to bend the brace between the rails. PE1BTX used a pair of air balloons from a truck suspension. These could be inflated to give the tower a