Re: [amsat-bb] Minimizing de-sense on Arrow and other closely spaced antennas

[Tom Busch <tomb@xxxxxxxx>]

I think you're right.  440 is where dimensions start getting critical, and 
I'm not sure you can cut a notch accurately enough.  Even if you could, the 
harmonic would get through, small enough as it is.

I suppose you're familliar with the diplexer in the antenna's handle; I 
also found that Far Circuits has blank boards for them as well.  I would 
get the parts from Digi-Key or somewhere.

73,

Tom WB8WOR

At 03:50 PM 10/10/02 -0400, Bill Acito wrote:
>Would a 1/4 stub coax notch, "T"'d into the 440 side, cut for the
>offending frequency, help? Or since it's also effective on multiples of
>the cut frequency, it's a moot point (since it may also be close enough
>to null out the downlink frequency)?

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