Forum: GNU Radio How fine is the sampling frequency?

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8e2ce39154545934067abed84daeee82?d=identicon&s=25 Davide Anastasia (Guest)
on 2007-04-11 16:13
(Received via mailing list)
Hi List,
How fine is the sampling frequency of the USRP and the decimation
factor? How can I test it?

Thanks all,
--
Davide Anastasia

web: http://www.davideanastasia.com/
email: s242248@studenti.ing.unipi.it
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2007-04-11 16:57
(Received via mailing list)
On Wed, Apr 11, 2007 at 04:11:28PM +0200, Davide Anastasia wrote:
> Hi List,
> How fine is the sampling frequency of the USRP and the decimation
> factor? How can I test it?
>
> Thanks all,
> --
> Davide Anastasia
>
> web: http://www.davideanastasia.com/
> email: s242248@studenti.ing.unipi.it

The sampling frequency is determined by the master clock on the board.
The oscillators Matt ships on the boards are 64 MHz with a frequency
accuracy spec'd at 50 ppm.

The tuning resolution of the DDC is about 0.01 Hz.  The tuning step
size of the RF front ends vary.  IIRC the RFX boards are using 4 MHz
steps.

The valid decimation rates are even integers in [8, 256]

Eric
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