>
> Thanks
>
> On Mon, May 16, 2011 at 12:09 PM, Marcus D. Leech <
address@hidden>
> wrote:
> 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-source producing a SIN wave at, let's say, 1KHz,
> feed that into a UHD/USRPx sink tuned to whatever your
> frequency is.
> The tone will appear at TUNED-FREQUENCY+1KHz.
>
>
>
>
> >
> > On Mon, May 16, 2011 at 10:02 AM, Marcus D. Leech
> > <
address@hidden> 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 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 that the offset measured must
> > necessarily be the total offset--that is, both Rx
> > and Tx can be "off" in frequency.
> >
> > The practical consequence should be NIL, because
> > frequency correction should normally only be done on
> > the Rx-side, and it should
> > simply adapt to whatever it sees, regardless of the
> > Tx and Rx components of the offset.
> >
> >
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> >
>
>
>
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