Hello Experts,

I am brand new to USRP.

I have connected analog signal generator's sine wave output (999.999 MHz,
-30dBm) to the  USRP2 (Rx2).

A Rb 10 MHz freq. standard provides reference signal to the signal
generator as well as to the USRP2.

I have set the carrier frequency of the radio at 1GHz.

I am trying to see the output of rx_stream.

I expected a 1kHz sine wave signal, but I just get a flat line. I want to
see a sine curve,  but have no idea what other parameters do I need to
provide and where and how.

Here are the values I have set:

//-----------------------------------------------------

//setup the program options
po::options_description desc("Allowed options");
("args", po::value(&args)->default_value(""), "multi uhd device address args")
("type", po::value(&type)->default_value("short"), "sample type: double, float, or short")
("nsamps", po::value(&total_num_samps)->default_value(0), "total number of samples to receive")
("duration", po::value(&total_time)->default_value(0), "total number of seconds to receive")
("spb", po::value(&spb)->default_value(10000), "samples per buffer")
("rate", po::value(&rate)->default_value(10e6), "rate of incoming samples")
("freq", po::value(&freq)->default_value(1e9), "RF center frequency in Hz")
("gain", po::value(&gain), "gain for the RF chain")
("ant", po::value(&ant)->default_value("RX2"), "antenna selection")
("subdev", po::value(&subdev), "subdevice specification")
("bw", po::value(&bw), "analog frontend filter bandwidth in Hz")
("ref", po::value(&ref)->default_value("external"), "reference source (internal, external, mimo)")
("wirefmt", po::value(&wirefmt)->default_value("sc16"), "wire format (sc8 or sc16)
("setup", po::value(&setup_time)->default_value(1.0), "seconds of setup time")
("progress", "periodically display short-term bandwidth")
("stats", "show average bandwidth on exit")
("sizemap", "track packet size and display breakdown on exit")
("null", "run without writing to file")
("continue", "don't abort on a bad packet")
("skip-lo", "skip checking LO lock status")
("int-n", "tune USRP with integer-N tuning")
;
//----------------------------------------------

When I set reference source to "internal", and with all other setting as
it is, I do get a desired output, a nice looking sine wave.

What should I be doing to get a sine wave while using an external ref.?

Any pointers would be highly appreciated.

Thank you very much for your time and guidance.

Cheers!

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Hello Experts,

I am brand new to USRP.

I have connected analog signal generator's sine wave output (999.999
MHz, -30dBm) to the  USRP2 (Rx2).

A Rb 10 MHz freq. standard provides reference signal to the signal
generator as well as to the USRP2.

I have set the carrier frequency of the radio at 1GHz.

I am trying to see the output of rx_stream.

I expected a 1kHz sine wave signal, but I just get a flat line. I want
to see a sine curve,  but have no idea what other parameters do I need
to provide and where and how.

Here are the values I have set:

//-----------------------------------------------------

//setup the program options
po::options_description desc("Allowed options");
("args", po::value(&args)->default_value(""), "multi uhd device address args") ("type",
po::value(&type)->default_value("short"), "sample type: double, float,
or short") ("nsamps", po::value(&total_num_samps)->default_value(0),
"total number of samples to receive") ("duration",
po::value(&total_time)->default_value(0), "total number of seconds to
receive") ("spb", po::value(&spb)->default_value(10000), "samples per
buffer") ("rate", po::value(&rate)->default_value(10e6), "rate of
incoming samples") ("freq", po::value(&freq)->default_value(1e9), "RF
center frequency in Hz") ("gain", po::value(&gain), "gain for the RF
chain") ("ant", po::value(&ant)->default_value("RX2"), "antenna
selection") ("subdev", po::value(&subdev), "subdevice specification")
("bw", po::value(&bw), "analog frontend filter bandwidth in Hz") ("ref",
po::value(&ref)->default_value("external"), "reference source (internal,
external, mimo)") ("wirefmt",
po::value(&wirefmt)->default_value("sc16"), "wire format (sc8 or sc16)
("setup", po::value(&setup_time)->default_value(1.0), "seconds of setup
time") ("progress", "periodically display short-term bandwidth")
("stats", "show average bandwidth on exit") ("sizemap", "track packet
size and display breakdown on exit") ("null", "run without writing to
file") ("continue", "don't abort on a bad packet") ("skip-lo", "skip
checking LO lock status") ("int-n", "tune USRP with integer-N tuning") ;
//----------------------------------------------

When I set reference source to "internal", and with all other setting as
it is, I do get a desired output, a nice looking sine wave.

What should I be doing to get a sine wave while using an external ref.?

Any pointers would be highly appreciated.

Thank you very much for your time and guidance.

Cheers!

Online Storage & Sharing, Online Backup, FTP / Email Server Hosting and
More.
Drive Headquarters. Top quality services designed for business!
Sign up free at: www.DriveHQ.com
http://www.drivehq.com/?refID=178949&refEmails=&refCode=.

USRP-users mailing list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com