Raspberry PI 4 setups for iCW
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Chuck Vaughn
May 27, 2020, 11:27:22 AM5/27/20
to iCW - internet CW
this is a brief VIDEO DEMO test for seeing how well the TRIGGER MIDI MONO lv2 plugin on a PI 4, can regenerate the CW AUDIO OUTPUT from a CW PRACTICE channel on the iCW server...also, to see how much pi4 CPU use it causes and to eval the general pi4 stability and performance of the whole setup...
NOTE: KXstudio has one of the best set of AUDIO DSP PLUGINs and software for both LINUX, and the PI, and even some for MAC and WINDOWs. KXstudio recently added support for Raspbian Buster and higher
aa0hw
May 27, 2020, 3:16:23 PM5/27/20
to iCW - internet CW
Here is another example of the pi4 as a standalone complete cw station for iambic paddles, straight key & cw keyboard
Chuck Vaughn
May 28, 2020, 9:52:40 AM5/28/20
to iCW - internet CW
here is another Mumble on the pi4 video demo -
- setup for AUTOMATIC GAIN CONTROL on your mumble output
using the VLevel APP - http://vlevel.sourceforge.net/about/
(NOTE: VLevel was already in the RASPBIAN(buster) SYNAPTIC PACKAGE MANAGER)
from -20 db to +20 db...the mumble audio output remains the same...
Chuck Vaughn
May 28, 2020, 11:35:31 AM5/28/20
to iCW - internet CW
here is another PI4 mumble iCW station video demo...using CUBICsdr to listen to
the CW in your mumble channel...offers several advantages...
using CUBICsdr to demodulate the MUMBLE CW AUDIO OUTPUT on your MUMBLE client, has several advantages
1. AGC2. CW PITCH control
3, CW BANDWITH control
4. has JACK SUPPORT so that it shows up in the jack audio connection kit bay...easy to wire up from mumble to sound card output etc...
CUBICsdr was already in the RASPBIAN BUSTER synaptic package manager...easy to download & install via synaptic
CUBICsdr does tax the pi4 CPU...and running the SCREEN RECORDER pushed it even more(audio crackles etc...not enough buffer frames on JACK)...but without running the SCREEN RECORDER it was usually running under 50 percent on the CPU readout
CUBICsdr does open up some new features for RECEIVE CW AUDIO on the MUMBLE CLIENT when in QSO on the iCW SERVER
Chuck Vaughn
May 28, 2020, 12:07:51 PM5/28/20
to iCW - internet CW
here is another video demo that uses much less CPU for an SDR to DEMOD the CW in a mumble channel
on a RASPBERRY PI 4
follow up video from the others on this topic...this video shows the AD5DZ SDR LO-MIXER app...
https://github.com/recri/keyer
which lets you choose the CW PITCH of anyone on the mumble iCW SERVER https://sites.google.com/site/icwoip/
also uses:
VLevel for AGC: http://vlevel.sourceforge.net/about/
MOD-DEVICE's BandPassFilter for isolating the CW TONE from the ad5dz lo-mixer mixing products:
Chuck Vaughn
May 28, 2020, 2:43:31 PM5/28/20
to iCW - internet CW
here is another use case for a RASPBERRY PI 4 station on iCW using Jack Audio Connection Kit
for all audio APPs routing etc.. this video shows some useful DSP AUDIO plugins to help you evaluate
your own CW SIGNAL on MUMBLE by using the ICW MUMBLER SERVER loopback mode
Chuck Vaughn
May 29, 2020, 10:29:46 AM5/29/20
to iCW - internet CW
stress testing the PI4 for a very complicated advanced setup for iCW
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