Re: [Discuss-gnuradio] Retune Request Time

[Martin Braun]

On 06/14/2016 12:13 PM, Richard Bell wrote:
> Martin,
> 
> If I create a USRP object
> 
> self.usrp = uhd.usrp_sink(device_addr=options.args,
> stream_args=uhd.stream_args('fc32'))
> 
> and initialize the USRP center frequency to 900e6
> 
> self.usrp.set_center_freq(900e6)
> 
> and then do
> 
> tr = uhd.tune_request(901e6, 1e3)
> 
> followed by
> 
> uhd.usrp_sink.get_center_freq()
> 
> it returns the original center freq of 900e6. My question is what is the
> tune_request doing?

It's creating an object of type 'tune_request_t'. That's what the
argument type for set_center_freq() is, only that function will also
work with a double (and then create a tune_request for you).

I'm guessing you meant:

tr = uhd.tune_request(901e6, 1e3)
self.usrp.set_center_freq(tr)


M