QRQ CW @ 120 wpm on the VLF BAND - RX on QUISK SDR + 2 Gstreamer Bandpass Filters to help

[Chuck aa0hw]

brief demo of picking up a QRQ CW signal on the VLF BAND @ 12 Khz, using this VLF RX - bi-coil Ferrite Mass Antenna(FMA) - https://youtu.be/ZKVurZ2KzDA

in this demo, 2 specialized Gstreamer bandpass scripts are used:
1. one to match the VLF BANDWIDTH of QUISK SDR
2. another one to filter the demod'D CW output of QUISK SDR, to
help reduce the CW ELEMENT PERCUSSIVE EDGE NOISE...

GSTREAMER VLF BANDPASS FILTER USED:
gst-launch-1.0 jackaudiosrc name=12KHZinput ! queue ! "audio/x-raw,channels=1,rate=96000,format=F32LE" ! audioconvert ! audiowsincband mode=band-pass lower-frequency=11500 upper-frequency=12500 length=900 window=hamming ! audioconvert ! audioamplify amplification=30 ! audiorate ! queue ! jackaudiosink name=12KHZoutput

GSTREAMER QRQ CW BANDPASS FILTER USED:
gst-launch-1.0 jackaudiosrc name=CWinput ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=738 upper-frequency=938 length=600 window=hamming ! audioconvert ! audioamplify amplification=1.17 ! audiorate ! queue ! jackaudiosink name=CWoutput