I am attempting to use this receiver to analyze signals in the AM/FM
bands. However, I have had no such luck.
Since the sound card is not working on my machine I cannot attempt to
output to the sound card.
Here are some of commands I have tried:
FFT centered near a known FM station at 89.7MHz
./usrp_fft.py -R B -f 89M
results: mostly -30dB noise in the window of +/-2.0MHz with a peak of
-5dB at the center frequency.
usrp_wfm_rcv.py -R B -f 89M
#similar results
Has anyone else experienced this?
Thanks in advance!
Rana
On Thu, Feb 28, 2008 at 04:54:59PM +0100, Rana B. wrote:
-5dB at the center frequency.
usrp_wfm_rcv.py -R B -f 89M
#similar results
Has anyone else experienced this?
Thanks in advance!
Rana
The LFRX only covers 0 to 30 MHz.
Eric
Good point. However, we have the same issue in the AM band on the LFRX
and in the 2.4G range with the RFX2400.
i.e.:
python ./gr-utils/src/python/usrp_fft.py -R B -f 1.44M -d 128
#produces the same results in AM
Moreover, we are not able to detect any transmitting devices with the
USRP.
Eric B. wrote:
The LFRX only covers 0 to 30 MHz.
Eric
Have you tried using coax to isolate the problem?
ahhh sorry, wrong thread.
On Thu, Feb 28, 2008 at 06:51:45PM +0100, Rana B. wrote:
The LFRX only covers 0 to 30 MHz.
Eric
What are you using for an antenna?
For the AM band I am not using an antenna.
For the 2.4GHz band I am using a 1/4 wave whip antenna.
Is there a better way to prove that the radio is detecting a signal?
Eric B. wrote:
On Thu, Feb 28, 2008 at 06:51:45PM +0100, Rana B. wrote:
The LFRX only covers 0 to 30 MHz.
Eric
What are you using for an antenna?
Rana B. wrote:
For the AM band I am not using an antenna.
You need to use an antenna.
For the 2.4GHz band I am using a 1/4 wave whip antenna.
You need to use a daughterboard which covers 2.4 GHz.
Matt
You need to use a daughterboard which covers 2.4 GHz.
I am using the RFX2400 board for 2.4 GHz band.
Rana B. wrote:
You need to use a daughterboard which covers 2.4 GHz.
I am using the RFX2400 board for 2.4 GHz band.
What are you using to generate a signal for it?
Matt
The problem was traced to the RFX2400 board that we were using. We
didn’t realize that the RFX2400 was crossed with a black pen and it was
marked 1200. As for the LFRX, the USRP_fft.py detects when the signal is
generated by another USRP board. But I was trying to capture local AM
station signals using that and it never worked. We have couple of AM
stations very close (less than 1 mile). They also did not register in
the USRP fft.