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#12
November 17th 05, 06:56 PM
posted to rec.aviation.piloting
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Transponder problem...
Stubby wrote:
The explanation I received years ago was your transponder replies with 12 bits of switch settings (4 switches with 3 bits each) and one more that reflects the IDENT button. The twelve data bits (which are either the transponder code or the encoded altittude) are always sent along with a beginning and ending framing pulse. The SPIP is sent 4.35 microseconds after the last framing pulse only when identing. 
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