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8CommentsMidwest, USAJoined January 1st, 2018
Tinkerer.
  • Raspberry Pi NOAA Weather Satellite Receiver

    Noticed that wxtoimg is no longer supported nor upgradable.I was able to upgrade it googling wxtoimg upgrade and it worked.This has to do with my color images that didn't really look that good.pi@mycomputer ~ $ wxtoimg -VWXtoImg version 2.11.2 betaProfessional editionCopyright (c) 2001-2013 Central North Publishing Limited.All rights reserved.

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  • Raspberry Pi NOAA Weather Satellite Receiver

    Ran the script to watch what happens at a random time:Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001Using device 0: Generic RTL2832U OEMFound Rafael Micro R820T tunerTuner gain set to 49.60 dB.Tuner error set to -3 ppm.Tuned to 137540000 Hz.Oversampling input by: 32x.Oversampling output by: 1x.Buffer size: 4.65msExact sample rate is: 1760000.037299 HzSampling at 1760000 S/s.Output at 55000 Hz.Signal caught, exiting!User cancel, exiting...sox WARN wav: Premature EOF on .wav input fileSatellite: NOAA 19Pass Start: 2018-02-07 08:53:48 UTCPass Duration: 14:24Elevation: 23Azimuth: 94Direction: southbound..Satellite: NOAA 19Status: signal processing............................wxtoimg: warning: Narrow IF bandwidth (purchase upgrade key!), low S/N, or volume too highGain: 23.0Chan...

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    Ran the script to watch what happens at a random time:Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001Using device 0: Generic RTL2832U OEMFound Rafael Micro R820T tunerTuner gain set to 49.60 dB.Tuner error set to -3 ppm.Tuned to 137540000 Hz.Oversampling input by: 32x.Oversampling output by: 1x.Buffer size: 4.65msExact sample rate is: 1760000.037299 HzSampling at 1760000 S/s.Output at 55000 Hz.Signal caught, exiting!User cancel, exiting...sox WARN wav: Premature EOF on .wav input fileSatellite: NOAA 19Pass Start: 2018-02-07 08:53:48 UTCPass Duration: 14:24Elevation: 23Azimuth: 94Direction: southbound..Satellite: NOAA 19Status: signal processing............................wxtoimg: warning: Narrow IF bandwidth (purchase upgrade key!), low S/N, or volume too highGain: 23.0Channel A: 3/3B (mid infrared)Channel B: 4 (thermal infrared)Satellite: NOAA 19Status: signal processing............................wxtoimg: warning: Narrow IF bandwidth (purchase upgrade key!), low S/N, or volume too highGain: 23.0Channel A: 3/3B (mid infrared)Channel B: 4 (thermal infrared)Satellite: NOAA 19Status: signal processing............................wxtoimg: warning: Narrow IF bandwidth (purchase upgrade key!), low S/N, or volume too highGain: 23.0Channel A: 3/3B (mid infrared)Channel B: 4 (thermal infrared)Satellite: NOAA 19Status: signal processing............................wxtoimg: warning: Narrow IF bandwidth (purchase upgrade key!), low S/N, or volume too highGain: 23.0Channel A: 3/3B (mid infrared)Channel B: 4 (thermal infrared)wxtoimg: warning: enhancement ignored: could not find a NOAA sensor 1 or sensor 2 image

    Just a guess here... - install ntpdate - sudo apt-get install ntpdate- change you time default to UTC - sudo dpkg-reconfigure tzdata

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  • Raspberry Pi NOAA Weather Satellite Receiver

    Using V-Dipole image and built a new antenna

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  • Raspberry Pi NOAA Weather Satellite Receiver

    Just changed my gain value to 49. Relating to PPM...and a copy and paste....Tuning the radio on an RTL SDR receiver, it’s very common to find the frequency read-out to be wildly inaccurate. To correct for this SDR applications request a PPM value which is unique to each RTL SDR USB dongle. To get your PPM value run the following command in the Linux CLI: rtl_test -pAs you can see. the value averages out over time to give a stable reading. My USB dongle is off by 85 PPM so I’ll enter this to correct my frequency reading.

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  • Raspberry Pi NOAA Weather Satellite Receiver

    @vallip,Here in the midwest use a V-Dipole in the attic. Configuration:sudo timeout $6 rtl_fm -f ${2}M -s 55k -g 80 -p 0 -E wav -E deemp -F 9 - | sox -t wav - $3.wav rate 11025tested for PPM and I got a zero or one. Tested using: rtl_test -prtl_test -pFound 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001Using device 0: Generic RTL2832U OEMFound Rafael Micro R820T tunerSupported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 Sampling at 2048000 S/s.Reporting PPM error measurement every 10 seconds...Press ^C after a few minutes.Reading samples in async mode...let it run awhile and pick the average for your PPM number.Here too purchased a amplifier - Amazon special - $10. ...

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    @vallip,Here in the midwest use a V-Dipole in the attic. Configuration:sudo timeout $6 rtl_fm -f ${2}M -s 55k -g 80 -p 0 -E wav -E deemp -F 9 - | sox -t wav - $3.wav rate 11025tested for PPM and I got a zero or one. Tested using: rtl_test -prtl_test -pFound 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001Using device 0: Generic RTL2832U OEMFound Rafael Micro R820T tunerSupported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 Sampling at 2048000 S/s.Reporting PPM error measurement every 10 seconds...Press ^C after a few minutes.Reading samples in async mode...let it run awhile and pick the average for your PPM number.Here too purchased a amplifier - Amazon special - $10. It is not shielded and did not work for me. Might send it back. Currently building a quadrifilar helix (QFH) antenna with 2" PVC and 1/2" PVC and RG6 cable. Here is a NOAA 19 picture from today using the V-Dipole in the attic.

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  • Raspberry Pi NOAA Weather Satellite Receiver

    Great Stuff!!! Purchased the "kit" with cables and antennas.

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