Shorter 4 cavity Coax filter design: Results.

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spyker49
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Shorter 4 cavity Coax filter design: Results.

Post by spyker49 » Sat Jun 23, 2012 1:53 am

A protype version of Sam Wetterlin Small top hat design: 4 cavity Coax #55 has been constructed. Only 2.4" heigh instead of 3.1". The Top Hat on each post is an inverted 0.5" dia copper cup.See my group file photos for test result plot and Sam's plan.

This build has been successful, nearest thing to the a brick wall coax filter.

The 1013 MHz loss is -11db a bit higher but with a good flat top 2.3MHz wide at the 3 db points. 11MHz wide at -60db is narrower than the normal size 4 cavity response curve. Minus -1.9MHz shift with 180F/100C temperature rise.

Regards Len Spyker

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