There are 11 CW signals to choose from,
each one at a different speed from 61 wpm to 81 wpm.
Use your own SDR APP on your own PC to scan each signal and choose the speed you would like to use for COPY BY EAR practice.
Use a Virtual audio cable as the YouTube browser playback device and set your SDR input to use the same…Continue
Added by Chuck aa0hw on April 6, 2020 at 11:02am — No Comments
brief demo of a REMOTE VLF-LF band transmitter/receiver with 9 QRQ CW ops present and sending CW
More details about the REMOTE VLF TRANSMITTER - REMOTE VLF ANTENNA here on playlist:…Continue
Added by Chuck aa0hw on March 18, 2020 at 2:43pm — No Comments
this is an experimental test setup to get rid of narrow band CW filter SEA SHELL BACKGROUND HOWLING, and QRQ CW Ringing...
by using a:
1. SIMPLE GATE
2. SIMPLE CW BANDPASS FILTER
the gate silences the "in between" cw element sea shell howling, and ringing, but also causes key clicks...
the following CW BANDPASS…Continue
Added by Chuck aa0hw on February 18, 2020 at 12:16pm — No Comments
brief demo of testing a VLF TRANSMITTER and VLF RECEIVER for QRQ CW operations
this is a follow up video to the first two using a VLF RECEIVE - BIPOLAR TESLA COIL with a FERRITE CORE antenna...the Transmitter is a tiny DELTA LOOP(7 foot per side) fed by a 5 watt audio amp…
Added by Chuck aa0hw on February 16, 2020 at 2:19pm — No Comments
brief demo showing QUISK SDR and a wire antenna hooked up to the PC's sound card input
- picking up a weak QRQ CW signal on VLF - 18 khz
- by using the AGC on QUISK SDR and sending the QUISK SDR receive audio through the CALF EQ 5 BAND lv2 plugin, the weak signal is brought up significantly to improve copy
Added by Chuck aa0hw on February 12, 2020 at 3:25pm — No Comments
REMOTE RIG QRQ CW KEYING - over ip - using Gstreamer scripts on a Raspberry PI 2b::RIG hardware interface, and a remote OP's Linux laptop, on the local area network, wired Ethernet, going through a Router and network switches
NETWORK CONDITIONS = poor
ROUTER = 20 yr old router, 100 mb limit...
ETHERNET CABLES = two "CAT 4" - 100…
Added by Chuck aa0hw on February 8, 2020 at 3:30pm — No Comments
brief demo of QRQ CW testing a Gstreamer CLI 1 liner - to get two different audio bandpass filters at the same time, staggered, and incremental, for their respective tones of 707 hz and 5555 hz
GSTREAMER CODE used in this BANDPASS FILTER TEST
gst-launch-1.0 -v interleave…
Added by Chuck aa0hw on February 4, 2020 at 2:38pm — No Comments
brief test of 24 bit VS 32 bit uncompressed audio going from a laptop to a Raspberry pi 2b loopback - and then right back to the laptop over Ethernet cables going through router and switches
32 bit has virtual no variance from the original audio source
24 bit does show a wide berth of harmonics generated at the lowest db…
Added by Chuck aa0hw on January 26, 2020 at 7:39am — No Comments
Added by Chuck aa0hw on January 16, 2020 at 5:22pm — No Comments
using Gstreamer to encode & decode Live Morse Code audio from the audio output of the AD5DZ software CW KEYBOARD...and then send it out on the network as UDP PACKETS...receive, decode and playback...
- really excellent quality CW AUDIO resulted from this AC3 ENCODING/DECODING test with pretty low network bandwidth traffic requirements at…
Added by Chuck aa0hw on January 12, 2020 at 3:31pm — No Comments
brief demo showing an experimental setup using REMOTE RIG AUDIO over IP via Gstreamer SERVER::CLIENT scripts...and Gstreamer CW bandpass filter scripts...with a RASPBERRY PI 2b as the hardware/software/soundcard interface between the REMOTE OP and the RIG(K3S)
QRQ CW KEYBOARD = AD5DZ's RECRI KEYER CW KEYER apps…
Brief example of showing the inclusion of an LV2 AUDIO FILTER chain into a Gstreamer PIPELINE
1. to discover what LV2 plugins Gstreamer "picks up" on your system.. run this command gst-inspect-1.0 | more
2. when you find the LV2 you want to incorporate into your Gstreamer pipeline run the inspect command again using the Gstreamer LV2…
Added by Chuck aa0hw on December 20, 2019 at 11:36am — No Comments
Gstreamer encodes and decodes the CW AUDIO using the GSM AUDIO CODEC - plus - one bonus of using Gstreamer for Receiving the TRANSMIT PIPELINE, is that Gstreamer has its own CW AUDIO BANDPASS filter PLUGIN code that you can setup and use...to filter out most of the harsh harmonics, and poor sounding audio of such a low bitrate, low sample rate,…Continue
Added by Chuck aa0hw on December 14, 2019 at 8:31pm — No Comments
this setup uses a RASPBERRY PI and its audio output going to the WINDOWS 10 audio input and SSH to bring the PI's AD5DZ CW KEYER's GUI onto the WINDOWS 10 desktop...so you can can have access to the typing screen and all the settings...
see this video for more info on the basic hardware and software setup…Continue
Added by Chuck aa0hw on November 27, 2019 at 7:30pm — No Comments
brief demo of using Windscribe's VPN service(free version) to be able to get through a public WIFI router that is blocking all ports...
ALSO at the same time, using Gstreamer TCP audio over ip, OPUS AUDIO CODEC pipelines to create a 2-WAY full duplex audio stream between the WiFi OP and another OP that is online trying to QSO with the OP using…
Added by Chuck aa0hw on November 25, 2019 at 5:02pm — No Comments
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 ...
this video is similar, only using the MFJ 451 CW Keyboard and placing…Continue
This demo shows the AD5DZ CW KEYBOARD sending CW at 60 wpm from a remote OP's location to a RASPBERRY PI 2b which is using the RIG's own sound card as its own sound card in order to send CW on that rig remotely, over ip, using AFCW MODE on LSB. In order to preserve the first bits of the CW ELEMENTS, when using VOICE VOX MODE on the RIG, on LOWER…Continue
every Raised Cosine Window that can be used to form the CW ELEMENT Rise/Fall time edges...sounds just a little bit different at QRQ CW speeds...this test was run at 55 wpm using the Riemann Window, and 3.3 milliseconds was also trimmed off of each element to make it just a tiny bit lighter, thinner sounding, between letters...
brief demo of selecting various raised cosine windows for copying qrq cw using the AD5DZ CPO, being keyed by the AD5DZ CW Keyboard....NOTE: ...might not hear much difference unless using a good set of headphones...the changes are subtle between all the raised cosine windows options....…Continue
Added by Chuck aa0hw on September 18, 2019 at 2:24pm — No Comments
Experimental test to see how well a Gstreamer AUDIO OVER IP pipeline can (also)filter CW AUDIO headed for the LINE INPUT of a RIG for CW TRANSMIT using AFCW MODE on HF SSB(remote rig over Ethernet LAN setup using a Raspberry PI2b::RIG interface)
Here is the Gstreamer script that includes the additional script for the CW AUDIO BANDPASS…Continue
Added by Chuck aa0hw on September 7, 2019 at 4:00pm — No Comments