Forum: GNU Radio GMSK_DEMOD question, please help me :)

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2c7550266c47f6ef5375f6fcbb5ad901?d=identicon&s=25 Cindy Ac (cindy_ac)
on 2014-06-24 23:11
Hello everyone,
   I am an intern this summer doing signal demodulation and decoding.
  I am using GNU Radio software to demodulate the 9600 bps 12.5KHz wide
modulated signal.

  Here is my process:
  I get the data from the antenna, sampled it at 2.048MHz,
  Go through a low pass filter and decimate the sample rate to 76.8KHz.
  Then go through GMSK demodulator with 8 samples per symbol. (I think
this maybe the problem.....) In this way,the output baud rate is 76.8k/8
= 9.6k

I could not get any repeated signal from this demodulation process. I
wonder if you could point out what I did wrong?
Thanks so much for your time!!!!
Really appreciated!

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