Re: [Discuss-gnuradio] UHD clock rate in the usrp e310 - release 4

[Martin Braun]

On 04/06/2016 10:26 PM, Martin Braun wrote:
> On the release 4 image, you can't do that. But you can set the clock to
> 16 MHz and use a decimation of 1000. Or you can use a clock rate of
> 16384e3 and a decimation of 1024, for a better decimation filter response.

...they'll probably be about the same, as the same number of halfbands
will be active. But the point is, you can't go below 10 MHz MCR on
release 4, and not above decimation 1024.

Cheers,
M
> 
> Cheers,
> Martin
> 
> On 04/06/2016 06:11 PM, Gabriel Pechiarovich wrote:
>> Hi, thanks for your answeri wasn't able to answer earlier.
>>
>> I was aiming to a 8MHz clock rate in order to use the DDC and get a
>> 16000 sample rate.
>> So i think i was misunderstood.
>>
>> Thank you very much 
>> Gabriel
>>
>>
>> 2016-03-31 13:25 GMT-05:00 Martin Braun <address@hidden
>> <mailto:address@hidden>>:
>>
>>     On the release 4 image, you can't set the clock speed under 10 MHz.
>>     However, you can use a DDC (which is built in and automatically used).
>>     Simply set the clock rate to 32 MHz (or 16 MHz if this is MIMO) and the
>>     sample rate to 8 MHz.
>>
>>     Cheers,
>>     Martin
>>
>>     On 03/30/2016 05:02 PM, Gabriel Pechiarovich wrote:
>>     > Hi all,
>>     > I've developed a flowgraph wich includes  a qpsk modulator and and
>>     audio
>>     > encoder, I used to run it in the E310 using the first release
>>     > (http://files.ettus.com/e3xx_images/e3xx-release-001/) and now
>>     trying to
>>     > use the release 4.
>>     >
>>     > The problem is:
>>     > in the UHD sink and source the clock rate was set to 8e6 Hz, and it
>>     > worked fine, in the release 1, but in the relese 4 the Clock rate wont
>>     > go lower than 10e6 Hz, so i cant archive the same results.
>>     >
>>     > Any idea how to force the use of 8MHz as the clock rate using the
>>     release4
>>     >
>>     > Thank you very much
>>     > Gabriel Pechiarovich Salas
>>     >
>>     >
>>     >
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>> -- 
>> Gabriel Pechiarovich Salas
>> Red Dragon Games
>> Designers and game developers
>