Re: [Discuss-gnuradio] B100 clock with UHD

[Robert Light]

I thought OpenBTS would use Transceiver52MHz to communicate with B100 and to configure the AD9522 to output 52MHz sampling clock. However, with OpenBTS working with B100 and WBX I measure 64MHz sampling clock. And I am confused here. I didn't compile OpenBTS with resampling option. So where does the resampling happen? Or, am I wrong thinking that OpenBTS uses Transceiver52MHz ? Where is the UHD in this chain ?

Regards, Robert

 

Gesendet: Dienstag, 21. Januar 2014 um 02:28 Uhr
Von: "Ben Hilburn" <address@hidden>
An: "Robert Light" <address@hidden>
Cc: "GNURadio Discussion List" <address@hidden>
Betreff: Re: [Discuss-gnuradio] B100 clock with UHD

Hi Robert -

 

The B100 has a configurable clock rate, specifically so that applications that require specific clock rates can tune it accordingly (e.g., OpenBTS). You can pass "master_clock_rate=<rate>" into the "args" string of the device and set the master clock rate to what works for your application. I haven't personally used OpenBTS recently, but if you aren't resampling on the host, that is probably how the host is using the device.

 

Cheers,

Ben

 

On Mon, Jan 20, 2014 at 8:29 AM, Robert Light <address@hidden> wrote:

Hi, I run B100 with OpenBTS. I thought the reconfigurable clock on B100 board would run with OpenBTS at 52MHz but I actually measure the sampling clock as 64MHz.

So, where is the resampling done? Is the driver Transceiver52MHz used with B100 or not? Can someone shine some light on how it actually works?

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