Re: [Discuss-gnuradio] BitRate USRP N210

Hi Abs,

there's no minimum Bit rate, but a minimum Sample rate, which for Gen2 devices such as the N2xx is Master Clock Rate / 512,
ie. 100MHz/512 = 195312.5 Hz.

20kHz is significantly below that, so UHD will tell you that it actually set the sample rate to 195.3125 kHz when you try to set the sampling rate. Consequently, supplying only 20kS/s to the USRP will lead to a whole lot of underruns.

Best regards,
Marcus

On 09/04/2015 05:47 AM, Abdeslam Bourkane wrote:

Hello,

What is the minimum bit-rate of the N210 ? There is any formula to define it ?

The N210 has 16 bit samples (limited by the host-GigE) so up to 25MS/s. 

C. Freq = 846.8 MHz

Bandwidth = 1MHz

Channel Bandwidth = 100 Hz

Sample Rate (Fs) = 20KHz

Is that correct : 

BitRate = sample rate * 16bit * 2 ? 

BitRate = 20KHz * 16 bit * 2 = 6.4 Mbps

The speedometer shows 798 KB/s (6.384Mbps). 

Thanks in advance

Abs

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