Re: [Discuss-gnuradio] Vector Source in GRC

[Scott Monteith]

It looks to be about 4900Hz.  I'm using the RFX2400 daughterboards on
each usrp2.

Scott

On Mon, Jan 11, 2010 at 2:08 PM, Josh Blum <address@hidden> wrote:
> what frequency is the sine wave? You are probably looking at a slight
> frequency offset due to the hardware. You may want to try giving each usrp2
> a common reference clock.
>
> -josh
>
> Scott Monteith wrote:
>>
>> Josh
>>
>> Thanks for the suggestion.  It looks like you were right with it
>> clipping, and scaling it down did the trick.
>>
>> Now, when looking at it on the other machine, running usrp2_fft.py -S,
>> the signal (for the vector [0.1], repeating) is a sine wave.  What is
>> making it this?
>>
>> Thanks again
>> Scott
>>
>> On Mon, Jan 11, 2010 at 12:16 PM, Josh Blum <address@hidden> wrote:
>>>
>>> I bet you are clipping, try scaling those numbers down to say 0.2. The
>>> range
>>> of the input on the usrp2 is -1 to 1
>>>
>>> -josh
>>>
>>> Scott Monteith wrote:
>>>>
>>>> I'm having trouble transmitting using the vector source in GRC.  I
>>>> have it sending [1+1j, 1-1j, -1+1j, -1-1j], repeated, to a USRP2 sink
>>>> and scope sink.  When run, the information on the scope sink (locally)
>>>> looks correct.  However, on a second host machine with a another USRP2
>>>> connected, the scope output looks like noise.  By comparison, using a
>>>> signal source transmits the expected values (cosine) properly.
>>>>
>>>> I did have to change the default value of 1 for the amplitude to a
>>>> lower value in the cosine signal source for it to transmit properly,
>>>> but there was no similar option for that on the vector source.  Could
>>>> this be the issue?  Any other ideas or suggestions?
>>>>
>>>> Thanks for the help!
>>>> Scott
>>>>
>>>>
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