I figured it out. The USRP input must have an input amplitude between 0 and
32767. When the amplitude was low the signal power was below noise so I
couldn't see anything in the FFT. When I raised it to 2 I was able to
see the peak around ( signal frequency +/- offset ).
Marcus about your stat
Let me give you the details this time. sorry for the confusion.
USRP - The first version
Daughterboard - RFX2400
The signal source has the following settings.
1. Sample Rate - 1Msps
2. Waveform - Sine & Complex
3. Frequency - 100kHz
4. Amplitude - 10
5. Offset - 0
This source is connected to th
Let me give you the details this time. sorry for the confusion.
USRP - The first version
Daughterboard - RFX2400
The signal source has the following settings.
1. Sample Rate - 1Msps
2. Waveform - Sine & Complex
3. Frequency - 100kHz
4. Amplitude - 10
5. Offset - 0
This source is connected to the
On Mon, 2011-05-16 at 15:34 -0500, John Andrews wrote:
I am running it at 2.5GHz.
What magnitude are the samples you're feeding into the USRP sink?
--n
Also, by default the RFX2400 has a TX filter that's centered at 2.441GHz
and about 85Mhz wide at the 3dB points. So, there'll be some attenu
On Mon, 2011-05-16 at 15:34 -0500, John Andrews wrote:
> I am running it at 2.5GHz.
What magnitude are the samples you're feeding into the USRP sink?
--n
>
> On Mon, May 16, 2011 at 12:39 PM, Nick Foster wrote:
> On Mon, 2011-05-16 at 12:32 -0500, John Andrews wrote:
> > I am u
I am running it at 2.5GHz.
On Mon, May 16, 2011 at 12:39 PM, Nick Foster wrote:
> On Mon, 2011-05-16 at 12:32 -0500, John Andrews wrote:
> > I am using the 1st generation USRP with RFX2400 daughterboards each
> > connected to the TX/RX interface.
> >
> > In the sine source block I am using a fre
On Mon, 2011-05-16 at 12:32 -0500, John Andrews wrote:
> I am using the 1st generation USRP with RFX2400 daughterboards each
> connected to the TX/RX interface.
>
> In the sine source block I am using a frequency of 100kHz. As the
> interpolation of USRP sink is 128 I am using a sampling frequency
I am using the 1st generation USRP with RFX2400 daughterboards each
connected to the TX/RX interface.
In the sine source block I am using a frequency of 100kHz. As the
interpolation of USRP sink is 128 I am using a sampling frequency of 1Msps.
On Mon, May 16, 2011 at 12:27 PM, Nick Foster wrote:
On Mon, 2011-05-16 at 12:23 -0500, John Andrews wrote:
> I am using GRC. I used a signal source block generating a complex sine
> at 100kHz. The USRP interpolation is 128 and the sampling rate of the
> sine generator is 1MHz. The USRP connected to another computer has
> USRP source configured at 64
I am using GRC. I used a signal source block generating a complex sine at
100kHz. The USRP interpolation is 128 and the sampling rate of the sine
generator is 1MHz. The USRP connected to another computer has USRP source
configured at 64 decimation and is connected to an FFT block. I don't see
any p
On 16/05/2011 1:03 PM, John Andrews wrote:
Shouldn't I use some kind of modulation scheme to do this, like FM or
AM, to transmit a tone?
No, you can just transmit a narrow, single-frequency tone, and use the
receivers FFT to determine how far off it is from
where you expect it.
use a signal-
Shouldn't I use some kind of modulation scheme to do this, like FM or AM, to
transmit a tone?
On Mon, May 16, 2011 at 10:02 AM, Marcus D. Leech wrote:
> On 16/05/2011 10:26 AM, Alexander Chemeris wrote:
>
>> You may also look into this code:
>> http://thre.at/kalibrate/
>> It estimates offset of
On 16/05/2011 10:26 AM, Alexander Chemeris wrote:
You may also look into this code:
http://thre.at/kalibrate/
It estimates offset of an USRP with regards to a GSM base station, but
it can be easily modified to measure offset from any clean tone, e.g.
transmitted by a second USRP.
Keep in mind th
On Sun, May 15, 2011 at 23:30, John Andrews wrote:
> How can we correctly measure what is the frequency offset between the two
> USRPs?
You may also look into this code:
http://thre.at/kalibrate/
It estimates offset of an USRP with regards to a GSM base station, but
it can be easily modified to m
On Sun, May 15, 2011 at 3:30 PM, John Andrews wrote:
> How can we correctly measure what is the frequency offset between the two
> USRPs?
Set one USRP to send CW. Tune the other USRP to receive CW.
The resultant frequency on the receiver side is the frequency offset.
> Thanks
Make sense?
Bri
How can we correctly measure what is the frequency offset between the two
USRPs?
Thanks
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