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Re: the on-axis hole

Hello Duke,

The strange thing about what you said about Earl Geddes's Summa is that Earl Geddes developped his waveguide in order to avoid those HOMs that seemingly are at the origin of the hole you mentionned.

For what it seems the waveguide shape succeed only partly to reduce those HOM. I think this is one of the reasons why, more recently, Earl Geddes filled entirely the waveguide with some foam.

Did the mesurement is done with the foam or not? If the answer is yes, most probably the origin of the hole on axis in the directivity response is yet to find...

Best regards from Paris,

Jean-Michel Le Cléac'h

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