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[Discuss-gnuradio] High-speed captures of high-quality signals available
[Discuss-gnuradio] High-speed captures of high-quality signals available.
Thu, 21 Apr 2005 16:45:36 -0400
After some prompting, I have put together three high-quality signal captures
for your enjoyment. The captures were made using the commandline:
./usrp_rx_cfile.py -o filename.dat -d8
Signal generator is a lab-grade HP8657B, recently calibrated, with output
level set at -10dBm, and with a 20dB attenuator at the USRP (-30dBm signal,
theoretically). The four frequencies used were 100kHz, 500kHz, 1MHz, and
2MHz. The DDC was set to zero.
All are available at http://www.lamarowen.net/files/
They average 1.5-2.5MB bzip compressed; uncompressed they are roughly ten
times that size.
USRP serial# 179 was used to make these captures, using a BasicRX module.
The results are encouraging. Previously, I had used my cheap Elenco function
generator; come to find out that its output is horrible and shouldn't be used
for basically anything. Probably a bad output coupling cap or something.
The HP8657B is only rated to go down to 0.1MHz, but it does go up to 2060MHz,
which is the range in which it gets used at PARI (we calibrate using it at
1420MHz and -122dBm). By comparing output levels one could look at
frequency response to a degree. If desired, I can use our noise source as
well; it's calibrated flat from about 1MHz to over 100MHz.
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
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