Failure to receive the correct Preamble

[bravehamid]

HI
I'm using a USRP to receive a signal on the 900 MHz frequency band, but the signal received after demodulation has no preamble. Does anyone know what the cause is?
transmitter information:
Baud rate=10K
modulation = BFSK
deviation = 100K
channel spacing = 350K

 

[DSheirer]

You might be better off posting this question to the gnuradio forums: MailingLists - GNU Radio

 

[bravehamid]

excuse me but i don't know how to use it.

 

[boatbod]

Preamble is going to depend on the protocol. What are you monitoring?
What application are you using to attempt the decode?

 

[bravehamid]

my module is XTP9B and I'm trying that receive data with USRP B210(with gnuradio).Sender of the module is ADF7023.In the datasheet ADF7023: Preamble=0x55

 

[Ubbe]

Are you talking about preamble or actually preemphasis?

/Ubbe