Interrupt Modulated(IM) QRQ CW Mode transmitting and receiving digital information using an analog carrier where the required bandwidth is limited to approximately the frequency of the analog carrier signal. The method is called interrupt modulation and consists of interrupting an un-modulated carrier signal so the…
ContinueAdded by Chuck aa0hw on March 28, 2024 at 9:49am — No Comments
USING rEvErSe iMaGe CW(riCW) MODE to minimize AUDIO GLITCHEs from poor internet performance with lots of packet dropouts...using an riCW encoder & riCW decoder the riCW encoder injects silence into an audio carrier to represent each CW ELEMENT, the riCW decoder is using CW REGENERATION to convert the silent CW…
ContinueAdded by Chuck aa0hw on March 23, 2024 at 8:00am — No Comments
ultra-LOW latency REMOTE RIG CW OPERATIONs from a remote laptop on the local area 'wired' network, through router & switches using the NETJACK 2, setup demo from this video:…
ContinueAdded by Chuck aa0hw on March 21, 2024 at 8:52am — No Comments
using a 21Khz sine wave oscillator signal source, and 2 individual AUDIO THRESHOLD to CW MIDI output GATEs, and the RECRI KEYER's midi input iambic CW Keyer Module, using just one laptop Stereo sound card to route audio stereo audio outputs and stereo audio inputs a way to use just one stereo audio sound card native to…
ContinueAdded by Chuck aa0hw on March 1, 2024 at 11:08am — No Comments
uses REAGATE GATE app to trigger a midi note output from the straight key 32Khz signal input to a sound card line input, output of REAGATE app sends a CW MIDI NOTE to key the RECRI KEYER's CW KEYER module https://github.com/recri/keyer
NOTE: this recri…
ContinueAdded by Chuck aa0hw on February 28, 2024 at 2:37pm — No Comments
using high Q, tuned, resonant VLF ferrite TX & RX VLF antennas(4.078Khz) a QRQ CW square wave into the resonant, tuned, high Q, TX antenna produces minimal harmonics...and even less of those harmonics survive by the time the same type of RX ferrite rod high Q, tuned, resonant, antenna removes even more of the…
ContinueAdded by Chuck aa0hw on February 27, 2024 at 9:10am — No Comments
working with 4Khz VLF ferrite rod TRANSMIT and RECEIVE antennas that are High Q & tuned to resonance(see previous 2 videos for the more info on the FERRITE ROD HIGH Q antennas being used for TX & RX on 4Khz VLF):…
ContinueAdded by Chuck aa0hw on February 23, 2024 at 10:53am — 1 Comment
RECRI KEYER's MIDI INPUT KEYED CW KEYER:
https://github.com/recri/keyer
AUDIO TO Midi CW NOTE OUTPUT converter by REAPER/reagate VST plugin…
ContinueAdded by Chuck aa0hw on December 28, 2023 at 1:34pm — No Comments
https://friture.org/ ; has versions for WINDOWS, MAC, and Linux
RECRI KEYER's CW KEYBOARD, FILT & MIXER modules used in this video demo:
Added by Chuck aa0hw on December 28, 2023 at 9:31am — No Comments
Added by Chuck aa0hw on December 24, 2023 at 7:55am — No Comments
QRQ CW example, by, AUDIO OVER iP via a GSTREAMER raspberry pi TCP AUDIO SERVER and a GSTREAMER laptop TCP AUDIO CLIENT, organized by two PYTHON scripts.
- you can download the TCP SERVER and CLIENT python scripts here:
PYTHON/gstreamer TCP SERVER:…
ContinueAdded by Chuck aa0hw on November 22, 2023 at 3:28pm — No Comments
using the info at GOOGLE PATENTs, this "TUNED" twin coil ferrite rod loopstick VLF Receive Antenna was put together from some spare parts in the shack, for a test run at 32Khz for receiving a QRQ CW signal at 32Khz…
ContinueAdded by Chuck aa0hw on October 19, 2023 at 8:21am — 2 Comments
in AFCW mode, a CW KEYBOARD keys 2 sine wave oscillators at 1500 hertz & 1520 hertz, the beat frequency creates the PULSE DENSITY MODULATED CW beat frequency that will become the PDM-CW TRANSMIT SIGNAL sending to the TRANSMIT INPUT on LSB at 1500 hertz(AFCW MODE)
on RECEIVE, trigger midi mono…
ContinueAdded by Chuck aa0hw on October 5, 2023 at 7:08am — No Comments
brief demo of using a simple DIODE/TRANSFORMER frequency doubler to get 40Khz CW out of a pi4 headphone jack, by sending to the diode doubler input, 20Khz from the pi's headphone jack
Pi4 HEADPHONE PHONE to diode/transformer/frequency doubler to class D amp input, CLASS D OUTPUT to a series resonant cap to a FERRITE ROD…
ContinueAdded by Chuck aa0hw on July 21, 2023 at 12:43pm — 1 Comment
using the ENB-CW method of encoding/decoding
brief test to see how well using the ENB-CW method to transmit and receive 12 hertz ELF EMF - for RADIO COMMs of a 'THROUGH THE EARTH' Cave Radio Transceiver prototype
NOTE: not shown on video is the MIXER, that up-converts the 12 hertz ENB-CW carrier to a 782 hertz…
ContinueAdded by Chuck aa0hw on May 27, 2023 at 12:42pm — No Comments
this is a follow up video from the 1st one here:
for more info on the VLF TRANSMITTER SETUP see this video's description:
in this video, an MFJ451 CW KEYBOARD keys the TLC551 at QRQ speeds
Added by Chuck aa0hw on May 23, 2023 at 11:34am — No Comments
with high Q antennas systems for RX/TX there is too much ringing & cw element elongation for good copy retrieval from the SDR down conversion from 5Khz to CW AUDIO... an alternative to straight mixing is to REGENERATE the CW from its unusable ringing cw elements...however, the elements volume peaks have to be equalized in volume by a DSP…
ContinueAdded by Chuck aa0hw on May 20, 2023 at 11:45am — No Comments
brief test to see if QRQ CW at 80 wpm could be PULSE DENSITY MODULATED effectively for transmit/receive on the ULF BAND at 1.784 Khz using very high Q resonant ferrite rod loopstick TX/RX antennas
for more info on PULSE DENSITY MODULATED CW(PDM-CW) please see this playlist:…
ContinueAdded by Chuck aa0hw on May 19, 2023 at 7:32am — No Comments
with high Q ringing on a QRQ CW signal, by high Q filters &/or high Q antennas, you are going to get CW ELEMENT RINGING and CW ELEMENT ELONGATION which distorts the typical wave shape of the DITs and DAHS... especially on the DITs...the elongation will decrease its volume since the element takes to long to reach peak output compared to a…
ContinueAdded by Chuck aa0hw on May 18, 2023 at 9:17am — No Comments
WHiTE and ViOLET Noise are combined and filtered
to only transmit from 40Khz to 48Khz
and this noise is used to create CW NOTEs that are 8Khz wide on the LF BAND
uses CW RE-KEYING methods shown on this playlist:…
ContinueAdded by Chuck aa0hw on May 9, 2023 at 5:25pm — No Comments
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