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DCS317(at)aol.com
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 Posted: Sun Nov 06, 2011 10:34 am Post subject: UPSAT Transponder |
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My UPSAT transponder Apollo Model SL70 gives Air Traffic Control the accurate altitude compared to my steam gauge altimeter and Chelton/Grand Rapids Technology units. However, the INDICATION on the face of the transponder is 300 feet off. Therefore not a problem with IFR, i.e., ATC gets the right altitude from interrogating the transponder (I've asked ATC numerous times), but I'd like the readout on the front of the SL70 to agree with my other altimeters.
Any easy do-it-myself fix?
Don
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sun Nov 06, 2011 11:32 am Post subject: UPSAT Transponder |
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To do that, you'd have to set the altimeter setting on the
transponder somehow so that it was reading whatever the
altitude of the day for that pressure is. This is just
how they work, if I'm understanding your dilemma correctly.
The transponder isn't an altimeter...it just gives PAlt
to the other systems. So don't think of it as such.
Tim Olson - RV-10 N104CD
do not archive
On 11/6/2011 12:29 PM, DCS317(at)aol.com wrote:
| Quote: | My UPSAT transponder Apollo Model SL70 gives Air Traffic Control the
accurate altitude compared to my steam gauge altimeter and Chelton/Grand
Rapids Technology units. However, the INDICATION on the face of the
transponder is 300 feet off. Therefore not a problem with IFR, i.e., ATC
gets the right altitude from interrogating the transponder (I've asked
ATC numerous times), but I'd like the readout on the front of the SL70
to agree with my other altimeters.
Any easy do-it-myself fix?
Don
*
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http://www.matronics.com/Navigator?AeroElectric-List |
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