Mode C Indication

Aside with the 29.92 altimeter setting, would temperature cause a difference?
I know that the encoders have a warm-up time while it's heating the sensor to a fixed
temp. Is that just for the electronics, or also for the static air? If so, then if
the static air/cabin temp is really cold, they could be different by a bunch, no? The
altimeter has temp error, whereas the encoder's kept constant.

The same argument as cold-weather minimums.

-Cory

Jeff wrote:
: In everyone's observation, what is the typical difference between the
: indicated altimeter reading with current pressure setting and the altitude
: reported by mode c transponder. It seems mine always has a discrepancy of
: 100', sometimes 200' compared to what ATC shows.

: Just wondering if it needs further investigation. Pitot static, altimeter
: and transponder inspections are all current.

: Thanks!
: Jeff



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