nuckollsr(at)cox.net
Guest
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 Posted: Sat Feb 24, 2007 9:05 am Post subject: compromised VOR/LOC/GS antenna performance |
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At 09:54 AM 2/24/2007 -0500, you wrote:
| Quote: |
Bob,
Exactly what does your answer have to do with his question? I'm confused,
I don't think he wanted to use it as a com antenna, just vor/loc/gs...help
me here.
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Yes . . . and I offered the information that it was (1) not
long enough for optimum performance in the VOR/LOC range
of frequencies . . . and (2) that classic mounting schemes
for this antenna (top or bottom of fuselage) produced
a cross-polarized pattern conflict. Comm stations are
vertically polarized while VOR/LOC antennas on the ground
are horizontally polarized. So unless he was willing
to mount the antenna out the side of the fuselage, vertical
fin or perhaps horizontally from the tip of a wing, cross-
polarization losses are stacked on top of too-short loss
of performance as a VOR/LOC antenna.
The term "degraded" is non-quantified. It can only
be interpreted to mean not-the-best-we-know-how-to-do.
That's why I suggested that he go ahead and install
the antenna, add the coupler for GS and go fly it.
There's nothing like the repeatable experiment to
to quantify performance against system requirements.
In these times when 99% of radio navigation is by
GPS, it may be that he only needs the VOR/LOC/GS
equipment to work for approaches where signal availability
at the airplane is always strong. Under these conditions,
the "degraded" performance may not be an issue.
Bob . . .
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( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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