"Richard Clark" wrote in message
...


snip
As for the others following this about crossed antennas, helical
antennas, there is one model the Navy uses that has interesting design
(Art will probably claim it proves what ever flavor theory he is
selling today) the AS-2227/SRN-9:
http://www.combatindex.com/hardware/...v/as-2227.html
http://www.combatindex.com/hardware/...as-2227_01.jpg

Woo-hoo! I remember that beast! I had an interference study to do on it.

The SRN-9 and WRN-5 were used with the old Transit satnav system, a
precursor to GPS. It worked OK (usually) but the satellites were
sub-synchronous and you could only compute a fix during a pass, which
happened only a few times each day. Even then, you needed to get it during
rising Doppler, which really meant half a pass.