An example of what Richard is saying is found when listening to a
none-too-strong FM broadcast station: if a big airplane flies into the path
near either end of the path, one will notice significant vector addition of
signals (heard as flutter).

Billboard (reflector) type passive reflectors have several applications.
One is to place the reflector on a high edge of a ridge that is not
accessible part of the year (or that does not have electric power) so as to
facilitate propagation along a valley.

"Passive Repeater" is used in about three ways: (1) large reflector;
(2) back to back connected, gain antennas; and (3) back to back connected
antennas with filter and gain blocks in the connection (sometimes,
bi-directional).

73 Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
Home:
"Richard Harrison" wrote in message
...
Bryan Martin wrote:
"Was this supposed to help or was it just a slam?"

No, my response was factual, neumeric, and specific. It was not meant as
a slam. Reflectors are less lossy than back-to-back antennas. If you are
using microwaves, the size of the reflector may be practical.

The peflector in the path is most effective when placed near either end
of the path. The reflector can also produce gain over that produced by
the antennas at the path ends. It must be slightly concave to do so.
Commercial reflectors often come equipped with an adjustment to suck in
the center of the reflector for maximum gain once alignment of the
dishes is accomplished. This isn`t speculation. I`ve designed the paths
and performed the adjustments with my own hands.

Best regatds, Richard Harrison, KB5WZI