[amsat-bb] 70cm preamp

Alan P. Biddle APBIDDLE at mailaps.org
Thu Sep 28 09:04:21 PDT 2006


Something is very wrong.  Setting aside the inaccuracy of S-meters, there
should be negligible loss.  I would expect something like that if the 2
meter output were used by mistake, since they are rated at about a 60 db
isolation.  However, your description seems to preclude that.  "I also
reversed it with the same results."  Does this mean you swapped direction,
or tried the 2 meter lead?

What did you see for an SWR when you transmitted on 70 cm with the
duplexer(s) in place?  If you really have that high a loss, it will show up.
Did you try and receive the satellite, or a local repeater, with the

Perhaps someone else will have an idea.


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