nuckollsr(at)cox.net
Guest
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 Posted: Sat Feb 03, 2007 5:54 am Post subject: Comm antenna share-box |
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At 02:35 PM 2/2/2007 -0600, you wrote:
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I think you're on the right track here, Bob. Anything that prevents that
connection from being exceedingly clean will cause a diode effect, and
rectification in an RF circuit can cause really nasty intermittent
problems.. The kind of problem you take to your avionics guy and say "this
squealing only happens when it is raining outside", and he laughs at you.
Also the insertion of things into RF transmission lines is not something
to be taken lightly. You are changing the impedance at that point, and
that will cause some amount of loss. Jim Weir says the amount of loss is
insignificant in the case of the IC-ANT-SB, but a poorly constructed
switchbox might introduce just enough loss to interfere with one's ability
to contact ATC at a distance when it's needed most.
Dave Morris
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Yup. Jim's right. The SWR "bump" inserted by
such 'non-feedline' accessories is insignificant in
terms of observable performance . . . but that little
hunk of brass bugs me. There is a better way and
this is just the group to give some new ideas a
try.
Bob . . .
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