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Old 25th March 2007 | 03:44
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Graybeard
 
Joined: Nov 2006
Posts: 896
Likes: 2
From: SoCalif
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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