I would like to add some type of carrier recovery to the GMSK

demodulator in

GNU Radio, however I am having a bit of trouble getting something

implemented that works properly. I have tried using gr.costas_loop_cc

to

add a costas loop for carrier recovery, but I am not quite sure how to

calculate the parameters (alpha, beta, fmax, fmin, costas_order).

Can anyone offer some insight into how to calculate these numbers?

Some nominal parameters to consider would be symbol rate of 31.25 kHz,

using

the USRP at max decimation (256) which results in 8 samples per symbol

(250

kHz) sampling. I’m using the TVRX daughtercard.

Thanks in advance for any help!

## Regards,

John

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