Quote:
These pings were on 33.3 KHz rather than 37.5 KHz, which the pinger manufacturer says would account for drift due to low battery after 30 days active.
I would be very surprised if that were true. As battery life reduces it is the amplitude of the signal which will reduce, not the frequency.
Speed of Sound is online now
The unit retrieved from AF447 emitted 34KHz in testing with a fresh battery.
http://www.bea.aero/fr/enquetes/vol....ion.report.pdf