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I'm trying to figure out my transponder issues. Any basic info would be helpful, along with guesses on diagnostics. I have a 2011 CTLS (serial F-11-03-05) with twin Dynon Skyview PDFs. There is no visible transponder in the panel. All transponder controls are accessed through the PDFs, by hitting Transponder button. From there I can turn the transponder on or off, set mode "C" (alt), set the transponder code and "ident", if asked. I do have a separate Transponder breakers. Recently, Centennial Tower has been telling me that my transponder is unreadable. Sometimes, they say they can read only my "target" with no altitude. Then, at other times they say it's totally in-op. When I recycle the transponder (by pulling breaker and re-setting it), the controller tells me its back and working. But eventually it fails again. The controller added detail ... and said it goes in an out, on downwind, then back on again in the base turn. They said it seemed like a "signal problem". I should mention that during the whole flight, the PDF shows normal (green display) transponder operation (except when I pull the breaker). QUESTION: What would make the transponder appear intermittently? While appearing "normal" on my PDF displays? I already checked antenna connection. It appears to be secure. QUESTION: Is the transponder a separate unit? Or is it contained within the Dynon Skyview PDF? IDEAS? Thanks! -Tom