Andy is correct, if software image rejection is enabled, the Bluetooth packet would be identified as a spur. You can disable it in the File->Settings menu.
Also, increasing your RBW and selecting the min/max detector will increase your chances of capturing a transmission.
The bandwidth of a Bluetooth transmission is greater than the instantaneous bandwidth of the SA44B, so it will be difficult to make accurate measurements on this type of signal.
Let me know if these suggestions help.
Regards,
Andrew
