VLF Transmitter & Receiver experiments

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Testing different software & hardware setups for VLF, ULF, SLF, ELF and LF operations
0:46
Raspberry Pi 4 Pulse Density Modulated CW Transmitter for THROUGH THE EARTH Cave Radio Comms at 8Khz
By QRQcw
  • 154 views
3:41
QRQ CW Practice by 10 instances of a python CW KEYBOARD, 10 text files on repeat @10 VLF frequencies
By QRQcw
  • 97 views
1:46
DiY CAVE RADIO 7kHZ VLF Transmitter & Receiver - using Pulse Density Modulated CW for Text Messaging
By QRQcw
  • 228 views
5:31
DiY Pulse Density Modulated CW VLF Transmitter & Receiver DEMO(7Khz)
By QRQcw
  • 103 views
1:41
DiY Pulse Density Modulated 5Khz VLF CW Transmitter - LIVE demo
By QRQcw
  • 177 views
2:41
VLF TX ANTENNA using an EXTENSiON CORD COiL(Trifilar Wound)Transmitter=Capacitive Discharge Circuit
By QRQcw
  • 197 views
2:11
Pulse Density Modulated HV VLF CW Transmitter - LAPTOP CONTROLLER to HV Capacitive Discharge Circuit
By QRQcw
  • 186 views
0:50
VLF CW over MUMBLE - demo of 2 ops sending rEvErSe iMaGe interrupt CW MODE: 375hz & 1055hz
By QRQcw
  • 101 views
3:57
STEREO iNPUT for MUMBLE - desktop stereo media player to 10Khz Double SideBand encoding/decoding
By QRQcw
  • 57 views
4:13
Pulse Density Modulated VLF CW Transmitter controlled by sound card for TX power & pulses per second
By QRQcw
  • 140 views
2:19
VLF CW over MUMBLE: 10 CW OPs sending at a diff VLF freq - RX APPs convert each VLF to its own audio
By QRQcw
  • 97 views
2:46
Pulse Density Modulated VLF CW Transmitter @QRQ speed using a 600 Watt Ferrite Core Coil Antenna
By QRQcw
  • 160 views
2:49
Through the Earth Signal Communication using Pulse Density CW Modulation BY inductive BACK EMF SPiKE
By QRQcw
  • 122 views
1:43
DiY sound card VLF Beacon by HIGH Q, resonant Transmit antenna - Pulse Generator ping to CLASS D amp
By QRQcw
  • 78 views
4:10
CW VLF 18kHZ Transmitter by Pulse Density Modulation, Capacitive Discharge into EMiTTER COiL Antenna
By QRQcw
  • 144 views
4:46
Pulse Density Modulation Morse Code, TRANSMIT & RECEIVE demo on LF band @64Khz - saves BATTERY DRAIN
By QRQcw
  • 95 views
2:22
Wire Frame Antenna for CW Transmitter on LF band self-resonant at 86Khz, TX/RX uses a sound card SDR
By QRQcw
  • 85 views
1:48
Pulse Density Modulated CW(PDM-CW)demo: 13μS pulse width @624pps for the duration of each CW element
By QRQcw
  • 80 views
2:54
FERRiTE CW TRANSMiT ANTENNA using 600 watt FERRiTE BOBBiN CORE INDUCTOR COiL on the LF band @ 65Khz
By QRQcw
  • 125 views
6:48
FERRiTE ROD VLF CW TRANSMIT ANTENNA, tuned, resonant at 4Khz, keyed by NPN @100μS pulse width bursts
By QRQcw
  • 157 views
3:05
Setup your own Schumann Resonance binaural beats by two 40hz(ish) Gstreamer pipelines on your laptop
By QRQcw
  • 129 views
1:37
testing a CW TUNED SPARK GAP Transmit FERRiTE ANTENNA resonant at 50Khz - Pulse Density Modulated CW
By QRQcw
  • 160 views
3:30
QRQcw experiment in high "Q" systems to adapt to low power Transmit DiTs due to high Rise/Fall times
By QRQcw
  • 110 views
3:02
Double SideBand 48Khz CAVE RADIO Through The Earth(TTE) sound card Transceiver 4kHZ WiDE Voice Audio
By QRQcw
  • 179 views
4:38
Interrupt Modulated(IM) QRQ CW Mode - Live demo on the VLF band
By QRQcw
  • 97 views
3:09
Interrupt Modulated(IM) CW Mode - Live demo on the VLF band
By QRQcw
  • 30 views
7:44
Pulse Density Modulated CW to save battery drain on the RF final AMP - uses a custom pulse generator
By QRQcw
  • 62 views
2:23
VLF band Through The Earth(TTE) TX/RX specialized FERRiTE ROD Antennas - Morse Code demo at 6.469kHZ
By QRQcw
  • 349 views
0:54
Pulse Density Modulated CW by HV CAPACiTIVE DiSCHARGE Transmitter into diy PULSE Ferrite Rod Antenna
By QRQcw
  • 85 views
5:48
Pulse Density Modulated CW, 50 μS pulse every 30ms for duration of each CW ELEMENT, VLF band example
By QRQcw
  • 76 views
7:05
Pulse Density Modulated CW(PDM-CW) for Through The Earth(TTE) portable radio COMMs: VLF BAND 26.8kHZ
By QRQcw
  • 65 views
2:45
diy Twin Coil Ferrite Rod(s) 26.6 kHZ VLF TX & RX Antenna for CW, Through The Earth(TTE) Radio COMMs
By QRQcw
  • 192 views
1:31
diy Twin Coil Ferrite Rod(s) 27kHZ VLF Transmit Antenna for RTTY, Through The Earth(TTE) Radio COMMs
By QRQcw
  • 99 views
2:21
diy Twin Coil Ferrite Rod(s) 27Khz VLF high 'Q' Transmit Antenna for Through The Earth(TTE) CW COMMs
By QRQcw
  • 143 views
2:55
Twin Coil Ferrite Rod SLF Transmit Antenna for Through The Earth COMMs - 100hz rEvErSe iMaGe CW mode
By QRQcw
  • 224 views
3:52
rEvErSe iMaGe CW MODE(riCM) through High Q, tuned, resonant, Ferrite Rod Antennas: over the VLF band
By QRQcw
  • 62 views
1:47
rEvErSe iMaGe CW MODE - CW ELEMENTS OF SiLENCE - embedded into a pilot tone carrier wave for CW/aOiP
By QRQcw
  • 57 views
3:34
reVerse iMAGE CW digital Mode - reduce ur Transmit bandwidth by at least half
By QRQcw
  • 44 views
0:58
CW iambic KEYER by soundcard, 2 audio transformers & FREE software
By QRQcw
  • 99 views
0:53
usE a FERRiTE TOROiD stepUP Transformer with a 32Khz sinewave to interface your Straight Key T UR PC
By QRQcw
  • 112 views
1:06
FSM carrier for a Morse Code 'touch' iambic PADDLE - heal your hand with microCURRENT while paddling
By QRQcw
  • 45 views
6:18
Hi Q, tuned, resonant, FERRiTE ROD TRANSMiT VLF ANTENNA for TX'n QRQ CW by a 'key'D square wave
By QRQcw
  • 74 views
2:25
Save Battery Power on final RF Transmit AMP, by reducing CW elements by 30ms; replace 30ms on RX app
By QRQcw
  • 136 views
4:37
VLF CW soundcard SDR Transmitter & Receiver: TX uses square Wave PulseGen APP; RX uses CW Regen APP
By QRQcw
  • 178 views
4:08
QRQ CW TX/|\RX high Q resonant VLF FERRiTE ROD antennas - how to combat ringing & element elongation
By QRQcw
  • 69 views
2:40
High Q Twin Coil Ferrite Rod VLF RECEiVE Antenna for Through The Earth COMMs: BPSK63F text messaging
By QRQcw
  • 235 views
4:39
High Q Large Ferrite Rod Pulse Transformer as a TRANSMiT FERRiTE Antenna for Through The Earth COMMs
By QRQcw
  • 104 views
2:13
Encrypted Tunnel-in-a-Tunnel by Zerotier & Wireguard, plus Obfuscation methods for a p2p secure chat
By QRQcw
  • 245 views
1:37
VOiCE, Morse Code AND miniModem VLF Text Messaging over a 1 channel AUDiO over iP Gstreamer PiPEline
By QRQcw
  • 137 views
1:18
MiniMODEM text messages over 16kHZ VLF/ip using SOUND CARD SDR mixer & Gstreamer AOiP/FEC/RTP/AES256
By QRQcw
  • 107 views
3:11
setup your own Broadcast or CW Practice Channel on Mumble using multiple VLF signals - LiVE iCW demo
By QRQcw
  • 149 views
1:53
DiY TWiN COiL FERRiTE ROD for the LF band(81Khz) RX Antenna - built by TWiN COiL google patent info
By QRQcw
  • 449 views
1:43
DiY TWiN COiL FERRiTE ROD VLF band RX Antenna - built from C. CRANE's TWiN COiL google patent info
By QRQcw
  • 648 views
6:28
DiY TWiN COiL FERRiTE ROD Receive Radio Antenna - built from C. CRANE's TWiN COiL google patent info
By QRQcw
  • 833 views
4:28
Pulse Density Modulated CW(PDM-CW) by CW KEYBOARD sending binaural beats via 2 sine wave oscillators
By QRQcw
  • 87 views
1:24
diy Microcurrent Therapy device(CW MORSE CODE KEYBOARD) send .4 & 1.2 second 10hz square wave pulses
By QRQcw
  • 71 views
1:46
diy Microcurrent Therapy Device using a LAPTOP & a unique 'OCEAN WAVE' waveform by SOX cli command
By QRQcw
  • 110 views
1:28
diy Microcurrent Therapy device using a Virtual Modular Synthesizer with a DC-coupled soundcard
By QRQcw
  • 89 views
1:08
Frequency Specific Microcurrent by 2 in-Phase & Quadrative iq Oscillators + harmonics & multi-chorus
By QRQcw
  • 95 views
3:05
diy Laptop Microcurrent setup for wound healing using 250 uS biphasic pulsed current(~40 pps)
By QRQcw
  • 82 views
0:59
experimental diy Electroacupuncture Treatment by repurposing a capacitive discharge ignition circuit
By QRQcw
  • 68 views
1:29
diy MicroCurrent Device: laptop, SOX, audio amp & probes - using a customized specialized waveform
By QRQcw
  • 73 views
1:09
Raspberry Pi4 5hz pEMF Generator using 2 Ferrite Bobbin Helmholtz Coils: driven by class D audio amp
By QRQcw
  • 109 views
2:05
Experimental Acupuncture Point Locator using Gaussian Noise & Bio-Resonance with a sound card SDR
By QRQcw
  • 88 views
5:02
diy MicroCurrent Therapy software - variable frequencies & timings - LiVE DeMo
By QRQcw
  • 72 views
3:09
mix 2 square wave frequencies to create a unique microcurrent therapy waveform
By QRQcw
  • 90 views
1:53
diy Microcurrent Therapy device using Gstreamer/limiter/DC-coupled soundcard output/audio amp/probes
By QRQcw
  • 51 views
1:17
Morse Mantra Microcurrent Therapy - @40hz - CES, pEMF & binaural audio beats
By QRQcw
  • 90 views
2:21
diy Schumann Resonance pEMF 7.83hz Generator/pulsed/ramp'd/square wave into Helmholtz Coils
By QRQcw
  • 1K views
2:05
2200 Meter qrp CW Transmitter using a sound card/diode frequency doubler/audio amp & Ferrite antenna
By QRQcw
  • 120 views
1:28
diy Frequency Specific Microcurrent: 40/116/355 hz: by LAPTOP sound card, audio amp, & 3 oscillators
By QRQcw
  • 91 views
1:05
Pi4 40Khz CW Transmitter output through its own HEADHONE JACK to diode/transformer frequency doubler
By QRQcw
  • 204 views
1:43
diy Frequency Specific Microcurrent using Gstreamer, laptop sound card, class d AMP - 40hz/10hz demo
By QRQcw
  • 72 views
2:34
save battery drain using Pulse Density Modulation on a portable CW Transmitter: VLF Band, LiVE DEMO
By QRQcw
  • 131 views
0:44
diy Acupuncture Point Finder - 2 audio isolation transformers for input/output with a USB SOUND CARD
By QRQcw
  • 90 views
3:19
diy MicroCurrent Device using a laptop & its sound card/an audio amp/ and +/-- 300uA meter/probes
By QRQcw
  • 106 views
1:40
ELF through VLF UNiVERSAL Frequency CONVERTER to Morse Code AUDiO: by STEVE HARRiS's DiODE PROCESSOR
By QRQcw
  • 259 views
3:29
cut down noise & ringing on a QRQ CW signal using GATE & LIMITER - LIVE DEMO on ULF BAND(80 wpm)
By QRQcw
  • 42 views
2:36
EXTREME NARROW BAND CW, even at QRQ, does not take up any more bandwidth than UNmodulated RF CARRIER
By QRQcw
  • 258 views
8:39
PULSE DENSITY MODULATED CW Transmitter & Receiver(ULF Band 2.6Khz) DEMO of sound card SDR apps used
By QRQcw
  • 67 views
3:31
Direct Conversion of ULF BAND CW signal from 2.6Khz to 750hz with 2 plugins ZAMGATE & SINE GENERATOR
By QRQcw
  • 59 views
5:07
use PULSE DENSITY MODULATION to save Battery Power on ULF BAND Cave To Surface Radio CW Transmitter
By QRQcw
  • 59 views
2:35
High Power Ferrite Rod Transmit Antenna for ULF BAND 'Through The Earth' CAVE Radio CW Transmitter
By QRQcw
  • 174 views
2:28
PULSE DENSITY MODULATION on a CW ULF Cave Radio Through the Earth Transmitter to save battery drain
By QRQcw
  • 63 views
2:36
using Gate & Limiter before Filter & Mixer for better copy of QRQq CW - 111wpm soundcard SDR example
By QRQcw
  • 55 views
1:12
DiY 12" long by 1 1/3" diam. LARGE FERRiTE ROD using 3 sizes of FERRiTE CABLE COREs stacked together
By QRQcw
  • 302 views
6:45
TX CW using sinewave TiCs(1 tic/60ms)(551 hz) Saves battery power on CAVE - SURFACE ULF TRANSMiTTER
By QRQcw
  • 98 views
2:16
QRQ CW \\ DE- "Q" -ER // SETUP to extirpate, deracinate, High Q Ringing Morse Code RX signals
By QRQcw
  • 90 views
5:55
using WEBm & VORBIS to send CW, bpsk31 text messaging & HD VOiCE, over iP on the VLF band: LiVE DEMO
By QRQcw
  • 161 views
2:29
ELF soundcard SDR Receiver - processing a 23 hertz ELF CW SIGNAL: to help clean it up & sound better
By QRQcw
  • 358 views
2:07
processing the RECEiVE SiGNAL from an SLF BAND, 144hz, soundcard sdr CW RECEIVER using audio plugins
By QRQcw
  • 65 views
1:00
save battery drain on a CAVE RADIO 'through the earth' TRANSMITTER using FLdigi & THROB digital mode
By QRQcw
  • 60 views
1:13
ULF BAND 'Through the Earth' CAVE RADIO SSB Transceiver using soundcard SDR & tuned Ferrite Antennas
By QRQcw
  • 368 views
2:49
SLF BAND 'Through the Earth' CAVE RADIO CW Transceiver using soundcard SDRs & tuned Ferrite Antennas
By QRQcw
  • 218 views
2:54
SINE WAVE to SQUARE WAVE back to SINE WAVE converter - for QRQ CW that has too much ringing/too soft
By QRQcw
  • 81 views
1:45
Dual Band(ULF & VLF)full duplex ENB-CW soundcard SDR Transceivers with high Q dual resonant antennas
By QRQcw
  • 71 views
1:59
Thor-22 for Through the Earth CAVE to SURFACE radio COMMs - text messaging with narrow band antennas
By QRQcw
  • 80 views
1:45
Raspberry Pi4 VLF Receiver decoding a 22kHZ VLF Carrier SiGNAL with micro-embedded CW Keying data
By QRQcw
  • 170 views
1:45
ESSB LSB test on VLF BAND, 12Khz, over iP on Caster.FM(free Radio Station) using mp3 codec LiVE demo
By QRQcw
  • 91 views
3:01
22kHZ, 250μs length pulse, 1PPS, VLF, {THROUGH THE EARTH} CAVE RADIO TRANSMITTER & RECEIVER Beacon
By QRQcw
  • 100 views