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Old transponder TSOs
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25th Mar 2007, 03:44
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Graybeard
Join Date: Nov 2006
Location: SoCalif
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I think you've answered it. A transponder not reporting altitude has to respond to Mode C interrogations with framing pulses, as it has no other reply mechanism than framing pulses.
Peshak is a good read, if you can follow him.
GB
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