The explanation that the avionics shop gave me was that the encoder was just a pressure transducer with a gain and zero adjustment that had to be checked across the range so that the ATC facility would read you out at the same altitude that the cockpit altimeter read. I do understand that the encoder assumes that pressure is 29.92 and that ATC provides its own correction.
This conversation came about when I was having the radio-transponder- encoder from 09H installed in 73H. I did notice a couple of pots labeled "Hi" and "Lo" on the side of the encoder so I accepted his explanation, and circumvented the hour he wanted to charge by having him install 09H's altimeter as well. There is also a sticker on the altimeter that was originally installed in 73H that reads "Repair or replacement of this altimeter requires encoder recalibration" For these reasons, I accepted as gospel that an encoder had to be matched with the altimeter. I was not terrible concerned since by handing the guy the altimeter I avoided an extra "calibration" charge. So I guess I am wondering if this "calibration" was an attempt to pad the bill, or was it legitimate? Cheers: Paul N2273H > Paul, > Just FYI, the encoder is not "matched" to the altimeter. It is uncorrected, and > probably fixed at 29.92. __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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