Re: [Discuss-gnuradio] Flipping problem

[isaacgerg]

If this is true, why is it that the residual carrier is reported as zero? 
Are you suggesting that this value is not correct?

Isaac



Matt Ettus wrote:
> 
> isaacgerg wrote:
>> I am sending a known sequence of samples from one USRP to another using
>> the
>> Basix RX/TX d'boards setting the frequency to 24e6.
>>
>> When I rx the sequence, the correlation of it keeps flipping, but not in
>> a
>> way that suggests residual carrier.  It seems as if I am experiencing an
>> instantaneous flip.
>>
>> My gain on both the RX and TX is set to 500. The signal amplitude I rx is
>> ~1200. When I run the GRC model, the Rx says I have no residual carrier,
>> invert is set to false, the dxc frequency is set to -24e6 and the
>> baseband
>> to zero.  On the TX side, I have these same values with the exception of
>> the
>> dxc freq, it is not set to 24e6. Why the flip??   What do all these
>> things
>> mean???
>>
>> Is 24e6 a bad freq to use with the basic TX/Rx?
>>
>> Thanks in advance!
>>   
> 
> I believe what you are seeing here is that the two USRPs are on two 
> different frequencies.  This is not a fault of the USRP.  No two 
> oscillators will be on exactly the same frequency, and so in any 
> practical receiver you must synchronize. 
> 
> Matt
> 
> 
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