[Discuss-gnuradio] what are the difference of usrp.set_tx_freq() and usrp.sink_x.tune()

[slimchao]

Hi Everyone,

I have a confuse by the setting of the value for the DDC. I have seen there
are two commands: usrp.set_tx_freq()  and usrp.sink_x.tune(). 

Could anyone tell me  what are the difference of usrp.set_tx_freq() and
usrp.sink_x.tune()?

Thanks a lot!

Chao
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