Many years ago I was experimenting with a two element 40 meter phased array. It was composed of two quarter wavelength vertical radiators with moderately good ground systems, spaced a half wavelength apart, in my back yard. The radiators and ground systems were, as close as I could make them, […]
Daily Archives: June 7, 2012
4 posts
Is it permissable to have both elevated and ground radials? Yes. But with only a few radials (less than about 8 radials per antenna) any radials contacting or very near earth will reduce system efficiency. With less than about 8 elevated radials, a ground rod connected at the common junction […]
Hams living within cities and urban lots are often unable to erect a tower with a regular Yagi or Quad. Experiments with wires may require a lot of space so many Hams “ending” with a multiband vertical antenna. Regardless of wide availability of many types of such antennas the answer […]
The antenna changeover relay on most linear amplifiers is rather slow, and when the transceiver keys it, there is an RF spark because the RF power appears before the relay has fully changed over. Many modern transceivers provide a delay of 10 – 15 ms between key-down – or pressing […]