Try reducing the amplitude to 0.7. Another possibility is that your
computer can't keep up. If you are using one of the standard
programs, are there U's printing in the terminal?
Matt
Also, what RF gain are you setting? Does it exceed the maximum input
level of the spectrum analyser?
Are you connected directly, or with an antenna?
On Tue, Jan 7, 2014 at 3:03 PM, Jonathan Fox
<[email protected] <mailto:[email protected]>> wrote:
A colleague and I are sending a simple signal in GNU Radio (sine
wave, 1 MHz, amplitude of 1) to the USRP sink and have the center
frequency at 500 MHz. The N210 USRP is hooked up to an Agilent
spectrum analyzer. On the analyzer we are seeing a weird phenomena
every two seconds. At first we see the carrier frequency and two
sidebands from the sine wave (see attached normal.gif). Then after
two seconds we get two bursts of multiple harmonics (see odd.gif).
The question is, why is this happening? Does the phase of the 1
KHz signal become discontinuous before or after being sent to the
USRP?
Thanks,
Jon Fox
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Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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