Mode 'S' - Confused
One of our club aircraft has recently been fitted with a GTX330 mode 'S' transponder.
I've been studying the manual and I must say, I'm slightly confused.
Quote: "In ALT mode the transponder replies to identification and altitude interrogations as indicated by the reply symbol. Replies to altitude interrogations include the standard pressure altitude recieved from an external altitude source which is NOT adjusted for barometric pressure".
So lets say I'm flying under the London TMA at 2400 (base 2500) on the LDN QNH 1002. the transponder is displaying PRESSURE ALT FL028 on it's display.
Will my returns indicate that I am flying at 2800ft, well above the lower limit of the LTMA???