Home |
Search |
Today's Posts |
#4
![]() |
|||
|
|||
![]()
Art Unwin wrote:
"When modeling close spaced element antenna assemblies it is possible that some elements are physically longer than the "driven" element. Is the length of an element sufficient to declare a "reflector" or are there other caveats involved (i.e. phase)?" Art answered his own question. The element doesn`t care how it gets a leading (capacitive) current, or a lagging (inductive) current. In our broadcast curtain antenna arrays, we used an RCA WM-30A phase monitor for the current angle in the ibnductive parasitic reflectors. Phase was adjusted to spec with a short-circuit stub connected to where the feedpoint would be if it were a driven element. Kraus is unequivocal on page 245 of edition no. 3 of "Antennas": "When the halfwave parasitic element is inductive (longer than its resonant length) it acts as a reflector. When it is capacitive (shorter than its resonant length) it acts as a director." Best regards, Richard Harrison, KB5WZI |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
CHAMPAIGN-URBANA -- Assistant Director for Technology (Chief Engineer) WILL-AM-FM-TV | Broadcasting | |||
Hudson Division Director Race | General | |||
Hudson Division Director Race | Policy | |||
Hudson Division Director Race | CB | |||
Hudson Division Director Race | Shortwave |