Re: [Discuss-gnuradio] Using external clock references in GRC environment

[Josh Blum]

On 06/05/2012 04:53 PM, Nazmul Islam wrote:
> I have attached a screenshot that shows that way I am using the USRP:UHD
> Sink block. I am running both of my USRP's with the same 10 MHz clock
> signal. The clock signal is coming from a function generator. Therefore, I
> have changed the clock source option in the USRP Sink block to be external.
> 
> Unfortunately, I am getting wrong/strange outputs due to this change. Do I
> need to make any other change in the flowgraph to make it work with
> external clock source?
> 

Please define "wrong/strange outputs".

Is the device locked to the reference? ie, is the ref lock light on?
http://files.ettus.com/uhd_docs/manual/html/usrp2.html#front-panel-leds

> Thanks,
> 
> Nazmul
> 
> On Tue, Jun 5, 2012 at 4:31 PM, Nazmul Islam <address@hidden>wrote:
> 
>> Hello,
>>
>> I am running two USRP2's with a 10 MHz external clock. I am using
>> gnuradio-companion to transmit data between the USRP's. I have changed the
>> *clock source* option as 'external' in the UHD:USRP Source & Sinc
>> blocks. I kept the time source and clock rate block as default since I am
>> not providing any external pps.
>>
>> Unfortunately, I am getting unexpected and wrong outputs. Do I need to
>> make any other changes in the USRP Source & Sink options?
>>
>>
>> Thanks,
>>
>> Nazmul
>>
>>
>>
>>
>> --
>> Muhammad Nazmul Islam
>>
>> Graduate Student
>> Electrical & Computer Engineering
>> Wireless Information & Networking Laboratory
>> Rutgers, USA.
>>
>>
> 
> 
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio