| This is my tribute to our impressive aerial farm. All
antennas were of the "curtain" type, i.e. massive contraptions
constructed from thick copperweld wire installed in
scientifically-spaced vertical and horizonal runs, suspended by thick,
steel cables running between towers. They were designated Groups A, B, C
and D. The "D" was the tallest, best performing of them all.
The main difference between each was basically in individual orientation
and azimuth. Each was "slewable" which meant that the
transmitted signal could be shifted across the aerial front to strike
different "targets" in different areas of interest. Each
aerial curtain had three settings: one on "bore-sight" (straight
ahead, center) and one each to the left and right of center. A small
shift of signal at the antenna source produced a huge shift of many
kilometers at the other end. Antenna gain ran between 20 and 25 db,
depending on the aerial.
I have been sent this wonderful document about the Pals antennas. It can be downloaded and uncompressed with winrar |