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		DCS317(at)aol.com Guest
 
 
 
 
 
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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
  [quote][b]
 
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		Tim Olson
 
 
  Joined: 25 Jan 2007 Posts: 2882
 
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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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