n1345p
Joined: 30 Jan 2008
Posts: 9
Location: Chickasha, OK
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 Posted: Mon May 05, 2008 12:40 pm Post subject: Avionics Upgrade options |
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Avionics Upgrade options;
I have A&P, BSEE, CFI-I and lotsa other letters...
I have an instrument student with a 1962 Cessna 172 with the
following:
RST Audio panel/MB – Works good.
RST intercom – Works fine.
Terra TXN720 – VOR needs calibrated; about 10 degree off.
TRI-NAV-C – To and From works, Couldn't get OBS knob to work. LOC
worked fine, GS always max up when ILS freq was selected and receiving – no GS in
TXN720.
King KX145 – Audio is poor, both TX and RX, VOR head would work, VOR
audio (HIWAS and Morse Code) was fine, but little action on the
Indicator – No TO or FROM, and needle moved by not seem unrelated to
Nav inputs.
We ordered the Terra manuals today from Essco, and will attempt to
calibrate the VOR and repair OBS knob.
I don't have any hope for the KX145. It may just needed reseating
the radio into the rack. We'll try that.
Now this student/owner wants to add a glideslope receiver to do his
instrument training and increase the utility of his airplane. I
think any radio shop would recommend throwing these radios away and
starting new. Options are:
1. Lowest cost – add an external GS receiver to the Terra TXN720 such
as a TKM-MG-200 or other. Make sure the Terra radio with Channel the
GS, and interface with Terra TriNavC, need splitter for VOR/GS
antenna. Should be less than $1000 plus labor.
2. Next lowest cost - Replace the KX145 indicator with an Val INS422 -
We put one of these in a Cessna 150. It is a good fit. Less than
$2000.
3. Best Value – Replace KX145 with Garmin 430W and GI106A – likely 8
to 10 grand.
4. What other options should we consider?
mitch
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