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1. 01:44 PM - Avionics Upgrade options (n1345p)
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| Subject: | Avionics Upgrade options |
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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http://forums.matronics.com/viewtopic.php?p=181315#181315
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