On 07/30/2018 12:30 PM, Amirhosein naseri via USRP-users wrote:
Hi everybody
I want to use Two DDC chain in usrp N210 to get streams for example
around freq0 and freq1 with sample rate 400e3 for each channel.
first i use uhd.tune_request_t function as argument fot
set_center_freq function as below :
usrp1.set_center_freq ( uhd.tune_request_t (freq1,0) , 0)
usrp1.set_center_freq ( uhd.tune_request_t (freq1,freq2-freq1) , 0)
I got two stream, first correspond to freq1 is true but for second
stream correspond two freq2 it's not.
second stream has frequency shift equal to sum of CORDIC frequency of
freq1 and freq2 ...
I test different configuration for arguments of uhd.tune_request_t but
i can't solve the problem ....
anyone has any advice in true usage of uhd.tune_request_t for using
two DDC chain of N210 ?
Tnx.
You'll have to use the policy arguments to prevent retuning of the RF
hardware in the second tune. When I have done this in the past, I've
set the RF hardware to exactly half-way between the two target
frequencies, and used the DDCs to bring in the frequencies I wanted.
https://files.ettus.com/manual/structuhd_1_1tune__request__t.html
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