U2->set_tx_center_freq(freq, &tr) setting failing

GNU Radio
1

Hi,

The Tx center frequency setting failing in the gnuradio-3.2.2 stable
release, when i try on my USRP2 to
transmit samples onto other USRP2 box. Even without specifying the -f
freq option also failing at this for
setting the default value setting. Could some body help me out, any fix
i need to take, if it was not in the
3.2.2 release.

=============gnuradio-3.2.2/usrp2/host/apps/tx_samples.cc=====================
if (!u2->set_tx_center_freq(freq, &tr)){
fprintf(stderr, “set_tx_center_freq(%g) failed\n”, freq);
return 1;
}

best regards,
srinivas.

2

On Fri, Jan 08, 2010 at 07:06:18AM +0530, srinivas naga vutukuri wrote:

=============gnuradio-3.2.2/usrp2/host/apps/tx_samples.cc=====================
if (!u2->set_tx_center_freq(freq, &tr)){
fprintf(stderr, “set_tx_center_freq(%g) failed\n”, freq);
return 1;
}

best regards,
srinivas.

What daughterboard are you using?
What is the value of freq?

Eric

3

Daughter Board: RFX 1800
what is the range i should have to provide? I tried orbritarily 1,100
(Internally what value it takes, ex: 1 means 1GHz or 1 means 1Hz).

best regards,
srinvias.

4

Hi,

if you’re trying to tune to 1100 Hz this should be too low for an rfx
1800.

With that daughterboard try somethinf around 1800 whithout commas.
I don’t know if this format is supported.

2010/1/8 srinivas naga vutukuri [email protected]

5

On Fri, Jan 08, 2010 at 11:00:22AM +0100, Hanno Jung wrote:

Hi,

if you’re trying to tune to 1100 Hz this should be too low for an rfx 1800.

With that daughterboard try somethinf around 1800 whithout commas.
I don’t know if this format is supported.

set_tx_center_freq expects a frequency in Hz.

Most of the python executables will accept a frequency expressed with
a trailing SI suffix. E.g., 1800M 1.8G.

You can ask what the valid tuning range is using:

double min = u2->tx_freq_min();
double max = u2->tx_freq_max();

If you’re using the usrp2, you may find it helpful to look at the
doxygen generated docs:

http://gnuradio.org/doc/doxygen/classusrp2_1_1usrp2.html

GNU Radio Manual and C++ API Reference: Modules

Eric