jadecuir(at)comcast.net
Guest
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 Posted: Sat Apr 04, 2009 7:44 am Post subject: Terra TN200 problem |
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To any Terra wizards out there, here's my setup:
Vans RV4, circa 1992.
One Terra TN200 (not "D") with GS, TRINAV head with Loran/GPS option
and GX50 connected, single dipole antenna mounted below tail, and
splitter for GS and VOR/LOC, with RG58 coax.
Problem: GS indications intermittently erroneous. I routinely fly the
ILS Rwy 30L approach into KSJC and have the opportunity to do so VFR
and check GS indications against published GS altitudes at the fixes
and the PAPI. Sometimes I won't get any GS indication until inside 5
miles.
Sometimes I get GS out at 15 miles, but it shows that I'm low
(about 1/3 up the scale) no matter where I am ref the actual slope. I
get no flag, the "I" is displayed, as opposed to an "L", and it stays
at that 1/3 low position until inside 5 miles final or sometimes closer.
And once in a great while I receive correct indications at 15 miles
and continuing all the way in.
Localizer indications are always correct and responsive, within
tolerance.
Station ID is clear and correct.
I checked at another airport, same results.
Questions: Shouldn't I get a flag? Shouldn't the "I" change to an
"L"? Is there an RF gain adjustment that needs attention? Where
should I look first?
Should I upgrade to RG400, as I have with GPS and Comm?
Do splitters go bad?
John DeCuir
N204CP, RV4
KSNS, CA
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