Re: [amsat-bb] Mode J Recieve Desense Problems

[John Magliacane <magliaco@xxxxxxxxxxxxxx>]

On Mon, 15 Nov 1999, Richard W L Limebear wrote:

> Trouble is that I can't remember whether you want a quarter-wave or a half-
> wave ... and whether its open-circuit or closed. But I'm sure someone else
> on the -bb will know this and post.

If the open end is, in fact *OPEN*, then use a quarter-wave.  If it's
shorted, then use a half-wave.  You can "snip" the quarter-wave stub 
a little at a time to find the "sweet spot", or insert a pin through 
a half-wave stub to do likewise.  Either stub will represent a very low
Z at the opposite end, and attenuate the undesired signal as a result.


73, de John, KD2BD

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