Using the MFJ 451 CW Keyboard to send QRQ CW to the Mumble Voice Chat audio input for QRQ CW QSO'n on iCW

this is a follow up video to the previous setup demo using an EMF coil and a CW KEYER's SPEAKER with a Gstreamer Bandpass Filter to clean up the KEYER's square wave harmonics and key clicks ...
https://youtu.be/o3JDDu3vH_c

this video is similar, only using the MFJ 451 CW Keyboard and placing the EMF PICK UP COIL right on top of the MFJ BLACK BOX SPEAKER grill...

see video notes on the link above for more info on the setup

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Comment by Chuck aa0hw on November 18, 2019 at 2:47pm

Here is the previous video showing the simple setup with an EMF PICK COIL to connect to the PC's Mic input

brief demo of showing a single GSTREAMER script to filter out the harsh cw square wave harmonics & key clicks from the speaker output of a CW KEYER that is connected to the laptop's MIC INPUT jack via an cheap EMF COIL....this Gstreamer script takes the MIC INPUT audio from the EMF COIL , puts the audio through CW AUDIO BANDPASS FILTERING, and then routes it to a Breakaway pipeline virtual audio sound card, which is where Mumble is listening for its input
https://sites.google.com/site/icwoip/best-virtual-sound-card-for-icw

here is the gstreamer script for this WINDOWS 10 laptop example
C:\gstreamer\1.0\x86_64\bin
gst-launch-1.0.exe -v wasapisrc device="\{0.0.1.00000000\}.\{67e005e8-2c93-4f81-895f-152ea9122ca6\}" ! queue ! audioconvert ! audiowsincband mode=band-pass lower-frequency=600 upper-frequency=800 length=300 window=hamming ! audioamplify amplification=40 ! audioconvert ! audiorate ! audioresample ! queue ! wasapisink device="\{0.0.0.00000000\}.\{697b40de-5272-4f25-9646-b4b75c03fd9a\}" buffer-time=35000

NOTE: all audio devices on this windows 10 laptop was set to
48 K sample rate....at 16 bits

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