Difference between revisions of "Spectrum Recording"
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== Bay Area Flight == | == Bay Area Flight == | ||
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| + | [[file:Bay_Area_Flight_Montage.jpg|800px|thumb|center|[http://twitter.com/TheJohnMalsbury John Malsbury] and I taking SDR to the skies]] | ||
=== Equipment/Software === | === Equipment/Software === | ||
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* Create a simple flowgraph in GNU Radio Companion with Parameter blocks to set properties of your capture device | * Create a simple flowgraph in GNU Radio Companion with Parameter blocks to set properties of your capture device | ||
** Destination should be a File Sink with the destination path set using a Parameter | ** Destination should be a File Sink with the destination path set using a Parameter | ||
| − | * Write the schedule | + | * Write the schedule in a text file where each line consists of: |
<Time (s)> <Frequency (MHz)> <Name> <Bandwidth (Msps, default: 1) | <Time (s)> <Frequency (MHz)> <Name> <Bandwidth (Msps, default: 1) | ||
*: A file of '-' implies a delay. | *: A file of '-' implies a delay. | ||
* Run ''timed_rx.py'' passing in your schedule, which has various command-line options: | * Run ''timed_rx.py'' passing in your schedule, which has various command-line options: | ||
| − | + | ("-g", "--gain", dest="gain", type="eng_float", default=eng_notation.num_to_str(25), help="Set Gain [default=%default]") | |
| − | + | ("-a", "--ant", dest="ant", type="string", default="TX/RX", help="Set Ant [default=%default]") | |
| − | + | ("-s", "--samp-rate", dest="samp_rate", type="eng_float", default=eng_notation.num_to_str(1000000), help="Set Samp Rate [default=%default]") | |
| − | + | ("-x", "--time-multiplier", type="float", default="1.0", help="Time Multiplier [default=%default]") | |
| − | + | ("-p", "--progress-step", type="int", default="1", help="Progress Step [default=%default]") | |
| − | + | ("-b", "--base-path", type="string", default="", help="Base Path [default=%default]") | |
| − | + | ("-c", "--run-count", type="int", default="1", help="Run Count [default=%default]") | |
After returning: | After returning: | ||
* Run raw capture files through [http://spench.net/drupal/files/CFileToWAV.zip ''CFileToWAV''] (with ''schedule.txt'' in same directory) to generate Winrad/HDSDR-compatible WAVs | * Run raw capture files through [http://spench.net/drupal/files/CFileToWAV.zip ''CFileToWAV''] (with ''schedule.txt'' in same directory) to generate Winrad/HDSDR-compatible WAVs | ||
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| + | {{RF}} | ||
Latest revision as of 16:38, 22 August 2012
Contents
[hide]Bay Area Flight
John Malsbury and I taking SDR to the skies
Equipment/Software
- USRP N210 + GNU Radio used to recording spectrum at different frequencies and bandwidths based upon pre-determined schedule
- HDSDR used to review recordings
Documentation
- Gallery of photos from the air (aerial photos of the Bay Area)
- Video of equipment and takeoff
Code
Scheduled Recording
WARNING: This was hacked up just before the flight. There are many things to be fixed/added (e.g. ability to set receive port when using multiple antennas).
The code to perform the following can be found in ScheduledSpectrumRecording.zip.
- Create a simple flowgraph in GNU Radio Companion with Parameter blocks to set properties of your capture device
- Destination should be a File Sink with the destination path set using a Parameter
- Write the schedule in a text file where each line consists of:
- A file of '-' implies a delay.
- Run timed_rx.py passing in your schedule, which has various command-line options:
("-g", "--gain", dest="gain", type="eng_float", default=eng_notation.num_to_str(25), help="Set Gain [default=%default]")
("-a", "--ant", dest="ant", type="string", default="TX/RX", help="Set Ant [default=%default]")
("-s", "--samp-rate", dest="samp_rate", type="eng_float", default=eng_notation.num_to_str(1000000), help="Set Samp Rate [default=%default]")
("-x", "--time-multiplier", type="float", default="1.0", help="Time Multiplier [default=%default]")
("-p", "--progress-step", type="int", default="1", help="Progress Step [default=%default]")
("-b", "--base-path", type="string", default="", help="Base Path [default=%default]")
("-c", "--run-count", type="int", default="1", help="Run Count [default=%default]")
After returning:
- Run raw capture files through CFileToWAV (with schedule.txt in same directory) to generate Winrad/HDSDR-compatible WAVs
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