[Elecraft] NCDXF/IARU Beacons

[Philippe Trottet]

Dear Elecrafters,
How to decode almost correctly the NCDXF/IARU beacons with a different pitch than 700~800Hz 
I'm using a pitch of 450Hz in order to use less bandwidth and it is more softer to my ears, especially on long runs.
I can hear clearly the beacons with the 450Hz but even I'm shifting up the VFO to listen a 600~700Hz tone, the decoder is not working even the pitch (so the FC) has been moved to those values. CWT is off. Width is used between 50 ~200Hz.  Filter: 400Hz
AGC on or off do not change anything.
On the other hand he decoder seems not really "sensitive" on weak signals.
Any trick ?
Bst 73's
Philippe A65BI
K3#3616