24 Oct
2006
24 Oct
'06
8:44 a.m.
Charlie G3WDG has designed a dual, concentric helix feed and microstrip filters to reduce the de-sens to very low levels; details are on his website :-
http://www.g3wdg.free-online.co.uk/dual.htm
regards
Grant G8UBN
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Grant Hodgson