Home |
Search |
Today's Posts |
#11
![]() |
|||
|
|||
![]()
Roy Lewallen wrote:
Tom Donaly wrote: There aren't many people who would support a lumped-element analysis on this newsgroup. Most people know the limitations of using network theory in these circumstances. The technical arguments against Cecil's approach were offered a long time ago. This latest is just a flareup that will soon die down. You shouldn't be confused. The transmission line model of antennas is well accepted and hoary with age, particularly for bi-conical antennas (see Schelkunoff). There are a couple of other types of models with equal validity. If you really want to know the physical score, though, you have to get an electromagnetics text that discusses the integral equations that govern antenna behavior. Pay particular attention to the parts that explain why numerical methods like EZNEC have to be used for solutions rather than the symbolic math most people would expect and want. 73, Tom Donaly, KA6RUH I did and do support lumped element analysis for a very small toroidal loading inductor, and extensively posted the reasons why in this newsgroup about six years ago ("Current in antenna coils controversy", 2003). Cecil and Yuri were arguing that the coil would replace some number of "degrees of antenna" and its current therefore would have a substantial phase difference between input and output ends. I made and posted careful measurements to support my statement, after which Cecil invented his "standing wave current" and went off in various directions. Roy Lewallen, W7EL I should have specified a large, solenoidal loading coil such as Cecil is so fond of using. Cecil has since eschewed his "degrees of antenna" position, but, for some reason, he keeps claiming your tests on the small solenoid were wrong. 73, Tom Donaly, KA6RUH |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Dish Network "500" dish with two LNBs | Homebrew | |||
Kenwood reflector | General | |||
Vet. with a reflector | Antenna | |||
Reflector for Hammarlund | Boatanchors | |||
Reflector for Hammarlund | Boatanchors |