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Scrolling waterfall and audio

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Greg
Greg Member ✭✭
edited June 2020 in New Ideas
I would like to suggest a feature with the upcoming Ver. 1.2's panafall scroll back feature. Please include the ability to play back audio anywhere in the spectrum displayed while scrolling back. This would not be a quick record function. Just put the active slice anywhere desired during a waterfall scroll back and listen to what you missed. Could be a correction to the DX call, signal report...anything. This would be awesome for both dxing and contesting. 73 Greg AB7R
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  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited June 2020
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    That is an interesting concept.  Like a "blackbox recorder" for the panafall.  It automatically records the last 10 (or 30) minutes in something like a FIFO buffer that can be scrolled back and played again.... That would make BCB or SWL DXing interesting, too... record 5 minutes each side of the top of the hour and then go back and play back every signal you see to get the station ID.....

    I don't know how much CPU & HD real estate this would consume, but it is an interesting concept.

    BTW, I can already do this apart from real time by recording DAX IQ on Audacity from my 6500 for a time and playing it back on my FLEX 1500.  But I only get to use 48 Khz of the band.  3000 & 5000 owners could use a much larger slice....
  • Greg
    Greg Member ✭✭
    edited April 2014
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    Yes but that is more of a kludge than a feature. When you do that does it record the entire displayed panadapter and let you go back to any signal in the display and listen to it? If so, how many steps does it take? I imagine quite a few. I am thinking just one button to turn the feature on or off. If on, it would continue to capture the last x minutes so the file does not get out of hand. Then when you use the scroll back function you only have to put the slice on whatever signal you want to listen to from the past x minutes.
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited December 2016
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    Yes, my way is more of a process, and only records whatever bandwidth I have DAX IQ set to pass, but it is fun to play with.  

    Steps:
    set up DAX,
    start and configure Audacity, set levels, hit RECORD,
    hit STOP,
    export & save recording to a file
    switch to 1500 and open wave menu
    find DAX IQ recording
    hit play & loop buttons
    tune in stations

    Yep... a bit of a kludge.... Of course, I could just record the IQ straight from my 1500, but how would THAT be any FUN?  <grin>
  • Peter Driessen
    Peter Driessen Member
    edited December 2016
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    Depending on how the internal software is configured, it may be possible to record a IQ stream at a higher sample rate say 1.536 MHz, as is done by the QS1R receiver with SDR Max V.  You can then play back the recording and tune to any signal within the recorded bandwidth.
  • Greg
    Greg Member ✭✭
    edited April 2014
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    Yes but what I am suggesting is more simple than that. No record buttons or play back buttons. Just using the waterfall scroll back, tune the slice to the signal you want to hear...thats it.
  • Robert -- N5IKD
    Robert -- N5IKD Member ✭✭
    edited March 2015
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    Like a DVR, always recording a buffer.
  • Rick Hadley - W0FG
    Rick Hadley - W0FG Member ✭✭
    edited January 2018
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    Long ago, and far away, an agency that Never Says Anything used to do something like that with a tape-based system.

  • Michael - N5TGL
    Michael - N5TGL Member ✭✭
    edited October 2016
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    Yep, that's exactly it.  Seems that the IQ data is being buffered for the waterfall already, so this might not be too tough to implement?  Heck, I'd be tickled pink to even just have a 30 second audio buffer.  In fact, that'd probably be all we'd ever need.  I think a 10 minute buffer would be overkill.

    This truly would be a game changer!
  • Steve-N5AC
    Steve-N5AC Community Manager admin
    edited February 2017
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    Each SCU produces 29.5GB of data per minute ... currently we do not have a good place to store that.  Even if we only did it for a 14MHz panadapter, after IQ mixing we still would have to store 11.8GB per minute of data.  It would be easier to do it on a more zoomed-in panadapter, though.  192ksps data is a mere 92MB/minute.
  • Michael - N5TGL
    Michael - N5TGL Member ✭✭
    edited October 2016
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    I'd be pretty happy with getting the last 30 seconds of audio in the visible panadapter.  Maybe limit it to 20 mhz either side of the tune frequency?

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