[USRP-users] B200 56MHz sample rate

Simon Brown simon at sdr-radio.com
Tue Mar 15 15:14:59 EDT 2016


Hi,

 

Processing 56MHz shouldn’t be too much on an issue with a decent PC, I can easily handle 32MHz with considerable FFT overlapping. Saving to disk is now quite easy with SSD as long as the customer buys the SSD arrays :) .

 

Simon Brown, GK4ELI
http://sdr-radio.com

 

From: Anon Lister [mailto:listeranon at gmail.com] 
Sent: 15 March 2016 19:05
To: Simon Brown <simon at sdr-radio.com>
Cc: Marcus Müller <marcus.mueller at ettus.com>; USRP-users at lists.ettus.com
Subject: Re: [USRP-users] B200 56MHz sample rate

 

You can specify on the wire format to request 8 bit (I and Q) samples be sent instead of the normal 16. If the lower bit depth is acceptable for your application, this may allow you to stream a wider bandwidth. With that setting I can get the full 56 out of my b200. Now processing that stream, or even saving it to disk....is another problem. :)

http://files.ettus.com/manual/structuhd_1_1stream__args__t.html

On Mar 15, 2016 2:57 PM, "Simon Brown via USRP-users" <usrp-users at lists.ettus.com <mailto:usrp-users at lists.ettus.com> > wrote:

Well,

 

That fooled the B200 into offering 56MHz as a sample rate but you’re right – the controller couldn’t handle it (At least I assume it’s the controller and not my dodgy software :) ).

 

32MHz streams superbly so I’ll leave that as the maximum for now.

 

I assume you’re sending 24 bit complex data from the B200?

 

Simon Brown, GK4ELI
http://sdr-radio.com

 

From: USRP-users [mailto:usrp-users-bounces at lists.ettus.com <mailto:usrp-users-bounces at lists.ettus.com> ] On Behalf Of Marcus Müller via USRP-users
Sent: 15 March 2016 18:31
To: usrp-users at lists.ettus.com <mailto:usrp-users at lists.ettus.com> 
Subject: Re: [USRP-users] B200 56MHz sample rate

 

You should just set the sampling rate to 56e6, and of course, you'll either need to leave that unspecified, or specify a master clock rate of 56MHz, too.
Just a small warning: It's very probable that the USB packet rate will bring your PC's USB3 controller to its knees. 

Best regards,
Marcus

On 03/15/2016 07:27 PM, Simon Brown via USRP-users wrote:

Hi,

 

While Derek is on holiday, can anyone help me get the 56 MHz bandwidth from my B200? What’s the trick please – at the moment it’s returning possible rates up to 16MHz, works well at 32MHz though. I would like to see how good the returned 56MHz is.

 

Probably just one command somewhere…

 

TTFN

 

Simon Brown, GK4ELI
http://sdr-radio.com

 





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