Hi Marcus,
When the N210 is transmitting, LEDs A,D,E,F are on. When the
N210 is receiving, LEDS C,D,E,F are on.
I run the uhd_fft script and the USRP detected the signal on the
right frequency (The frequency that it was trasmitted - 700.68).
Command to transmit: uhd_siggen -f 700681250.0
To:
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From:
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Date: Wed, 2 Mar 2016 21:09:40 +0100
Subject: Re: [Discuss-gnuradio] [spectrum sense bug][usrp]
Hi Heitor,
if the same applies to you just displaying e.g. 10MHz of
bandwidth with uhd_fft, you probably have a hefty oscillator
offset, either on the N210 10MHz reference or your signal
generator. What generates your signal, and which LEDs are
active on your N210?
Best regards,
Marcus
On 02.03.2016 21:06, Heitor
Araujo wrote:
Hi
I'm trying to do a basic spectrum sense with a USRP N210
kit and gnuradio.
I made a literature research and noted that the
“usrp_spectrum_sense.py” code was used in some articles.
But when transmit some signal in a certain frequecy and
execute the “usrp_spectrum_sense.py”, the signal is found
by the code, but it appears in another frequency (usually
about 1Mhz ahead). And also the bandwidth of the received
signal is different from the transmited signal (It seems
it depends of the sample rate of the transmited the
signal).
sudo ./usrp_spectrum_sense.py 699M 702M --fft 512 and
execute the "uhd_tx_dpsk.grc" in gnuradio to transmit the
signal from 700.2M tom 700.4M. The signal is detected in
700.7M to 701M.
Thanks
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