When cables are passed down through the tower center, the tower forms a less-than-perfect Faraday cage and the cables are not excited nearly as much as when hanging on the outside. Bad luck also mig
All of the data I have seen shows the effect rapidly dimiminishes as the frequency moves below upper VHF and is immeasurable at HF and lower. The only noticeable effect of weather is in noise (from
I can't imagine anyone trying to measure such tiny changes without extensive ground systems and very accurate and stable FS meters on a ground wave path. Sky wave would be worse yet, especially with
With a EWE antenna or any other small-area antenna of that family like Flags, Pennants, or small verticals almost any style resistor except wire-wound will work. If it is near a transmitting antenna,
Time for a reality check on contests everyone!! No matter what we do, rules will never be "fair". For example, the Stew can be won from any thousand-mile radius densely populated area of amateurs by
Disconnecting or connecting a wire makes no difference at all, as long as you have sufficient wire in the ground. If you have an inadequate radial ground, the interaction is quite complex and very u
Actually a linear loaded antenna (assuming a helical wire the whole length) has about the same radiation resistance as somewhere between base and center loading. It ranks in somewhere that area for
Displacement currents are fictitious currents that were "created" or invented to explain how current flowing into one lead of a capacitor manages to flow out of the other lead, without charges actua
Hi Dave, My point is the only way to reduce loss with a vertical near earth is to provide a conductive path for the currents back to the antenna area as evenly as possible over a large area that exte
We certainly have some vague or nebulous definitions in common use Earl!! Even if we are talking about linear loading as a folded section or hairpin, and not a continuously wound linear-loaded verti
The very thin porous overlay on standard MIG wire will disappear in any condition when exposed to moisture, even if the wire is suspended in air. I have to watch how extra wire reels for my MIG weld
I've never seen any measured data (where the correct parameters were measured) that indicated wire size is important to radial loss. The primary reason size is not important is easy to see, if we lo
The 775DSP has control system timing problems that generate thumps and bumps when on CW split, as well as severe leading-edge power overshoot in the PA. None of that is good on the PA transistors, o
You have to be *very careful* when adding relays in the TX path. It is a major headache that almost anyone who has sold products in aftermarket accessory manufacturing knows all too well. The RX ant
While it is true that disconnecting a 1/4 wl vertical from anything else will reduce re-radiation substantially, the noise test described above can not prove anything in many (or most) cases. It is
Bob, What measurement frequency does the LCIIB meter use in operation? It is an absolute requirement when making measurements of RF components such as transformers, inductors, and small value capaci
Good point by Ward. It certainly can be a problem. Power detectors or clamps in RF switched devices can even cause RFI and TVI. For example, the TR switching diodes in some imported VHF amplifier ac
I'm not saying anything one way or another about this because I haven't followed the discussion that close, but there is something to keep in mind. Transformers and matching systems with loss are no
Every practical system will excite some small current on the outside of the shield anyway no matter how the connection is made, because the ground system is always less than perfect and the feedline