Brazil 737-Embraer Crash

**THE-RFI-EMI-GUY** wrote:

A few questions:

Does anyone know if the transponder switch positions (on vs off) are
recorded by the FDR? Can it be proven that the transponder was
switched off?

Is the Brazilian gov't making a claim that the Legacy transponder was
off based soley on lack of reception by the ATC? (possible antenna
problem on new Legacy plane, or poor reception at ATC?)

The investigators have reported that ATC lost contact with the aircraft,
both from the transponder and by voice radio. One report said that the
crew might have changed to the wrong frequency when handed off between
centers. The transponder supposedly started working again after the
collision.

Beyond that, anything is simply speculation.