VLF Transmitter & Receiver experiments - YouTube

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Testing different software & hardware setups for VLF, ULF, SLF, ELF and LF operations
2:01
soundcard SDR ULF BAND 1Khz CW Morse Code Radio Beacon - only 1 sine wave cycle of 1Khz every second
By QRQcw
  • 100 views
1:48
HIGH "Q", QRQ CW ringing on a 1Khz ULF BAND RX signal - STOP RINGING with GATE & LIMITER & BP FILTER
By QRQcw
  • 71 views
1:12
Pulse Density Modulated CAPACiTiVE DiSCHARGE CW by Tuned Resonant VLF FERRiTE CORE TRANSMiT ANTENNA
By QRQcw
  • 71 views
8:14
Pulse Density Modulated CW - VLF BAND @ 3kHZ - a 1ms pulse every 40ms for the duration of CW element
By QRQcw
  • 73 views
1:51
enGage a Gate, to get rid of QRQ CW, NARROW BAND, high "q", ringing on CW RECEIVE SIGNAL - LiVE DEMO
By QRQcw
  • 50 views
1:33
Pulse Density Modulated CW Transmitter(8kHZ) ON TIME = 1ms for every 20ms for duration of CW ELEMENT
By QRQcw
  • 72 views
2:21
Pulse Density Modulated PSK31: SAVE Battery power by allowing only 1ms of BPSK31 to pass every 20 ms
By QRQcw
  • 47 views
1:38
High "Q" TUNED RESONANT Remote VLF ANTENNA over iP from a RASPBERRY Pi4 VLF Receiver - 8kHZ CW demo
By QRQcw
  • 183 views
6:00
Schumann Resonance Generator modified to pulse EMF with embedded TEXT data at 40 hertz audible beats
By QRQcw
  • 110 views
2:38
12 hertz, ELF, EMF, ENB-CW, QRQ Transmitter & Receiver: LIVE demo of an EXTREME NARROW BAND CW radio
By QRQcw
  • 191 views
2:12
infrasonic, 11hz, ELF EMF Through The Earth Cave Radio CW Morse Code Transmitter/Receiver LIVE DEMO
By QRQcw
  • 240 views
1:55
iAmBic & Straight Key CW KEYERs by 2 TLC551 oscillators, both running off the MiC JACKs power supply
By QRQcw
  • 126 views
0:46
Raspberry Pi iAmbic CW Keyer: TLC551 OSC., PADDLES, PI4, TriggerMidiMono & Recri Keyer miDi CW kEYER
By QRQcw
  • 104 views
1:31
TLC551 TiMER CHiP VLF AM TRANSMITTER Circuit - DEMO @23Khz - by voice modulating pin 5 through a CAP
By QRQcw
  • 108 views
3:37
VLF QRQ CW Transmitter: keying a TLC551 osc. to CLASS D audio amp to high Q Ferrite Resonant Antenna
By QRQcw
  • 121 views
1:14
VLF 20kHZ CW Transmitter - TLC551 oscillator to CLASS D audio amp to high Q Ferrite Resonant Antenna
By QRQcw
  • 182 views
2:39
QRQ CW on VLF band @5Khz @75wpm: alternative RX method using a soundcard SDR and HiGH "Q" antennas
By QRQcw
  • 82 views
1:13
keyed Morse Code CPO using a TLC551 Timer Chip powered only by a MIC JACK's power supply(works @ 1v)
By QRQcw
  • 214 views
1:55
Pulse Density Modulated QRQ CW test @80wpm on the ULF BAND through high Q, resonant Ferrite Antennas
By QRQcw
  • 45 views
5:30
Pulse Density Modulated ULF CW through high Q tuned FERRiTE ROD LOOPSTiCK TX/RX antennas: live demo
By QRQcw
  • 57 views
2:37
get rid of HIGH Q Ringing on QRQ CW by using a LiMiTER & CW Regenerator
By QRQcw
  • 50 views
0:49
VLF CAVE RADIO beacon transmitter using CAPACITIVE DISCHARGE through a tuned resonant high Q antenna
By QRQcw
  • 296 views
3:07
Pulse Density Modulated CW Transmitter: reduce battery drain by only transmitting 1 cycle of RF/10ms
By QRQcw
  • 50 views
6:06
Pulse Density Modulated CW(PDM-CW){ one .5ms pulse every 10ms} use ZAMGATE encoder/decoder for TX/RX
By QRQcw
  • 137 views
2:31
Pulse Density Modulated VLF CW - by combining & sending, 2 vincinal VLF RF Frequency TONEs together
By QRQcw
  • 52 views
2:21
sending QRQ CW over iP on LF BAND using CW notes made of 8Khz wide, white & violet noise CW elements
By QRQcw
  • 114 views
0:53
Mumble Voice Chat HD audio 10Khz LSB VOiCE & 16Khz - 20Khz 'WHITE NOISE' QRQ CW: utilize VLF BAND/iP
By QRQcw
  • 116 views
6:04
VLF QRQ CW RX signal gets direct conversion to CW AUDIO by LSP Sine Wave Oscillator & Sidechain Gate
By QRQcw
  • 77 views
1:57
VLF QRQ CW direct conversion to CW AUDIO by 2 VST PLUGINs, SINEcw & REAGATE
By QRQcw
  • 53 views
4:15
diy Sound Card VLF SDR using 2 WOLF SPECTRUMs, RECRi KEYER sdr modules & Stereo DJ X-fade - USB/LSB
By QRQcw
  • 71 views
1:39
VLF ENB-CW FLdigi decoder @180 wpm, working within high Q, resonant, TX/RX FERRITE CORE antennas
By QRQcw
  • 76 views
3:46
exploring the VLF band with QUiSK SDR using a soundcard's line input & FERRiTE ROD LOOPSTiCK antenna
By QRQcw
  • 278 views
1:49
Narrow Band VLF AM signal: adding parallel SATURATORs on RX to help restore treble voice frequencies
By QRQcw
  • 64 views
0:43
Pi4 REMOTE VLF SonoBus TRANSCEiVER: for Through The Earth COMMs using multiple smart phone Operators
By QRQcw
  • 197 views
9:13
VLF CW Transmitter with QSK and T/R switching for its FERRiTE CORE TX/RX AiRDUX coil 'tuned' Antenna
By QRQcw
  • 229 views
1:07
VLF BEACON PULSE TRANSMiTTER using a tuned HIGH "Q" FERRiTE BOBBiN CORE INDUCTOR ANTENNA
By QRQcw
  • 157 views
3:59
Double SideBand CAVE RADIO 'through the earth' Transmitter & Receiver: 44Khz, using FERRiTE antennas
By QRQcw
  • 256 views
0:42
Multi-band, ELF, SLF, ULF, VLF, Multi-Mode, BPSK31, BPSK63F, DOMX16, MFSK22, TRANSMiTTER(1 Antenna)
By QRQcw
  • 226 views
2:36
Gaussian-25 Raised Cosine Window for sending QRQ CW through a HiGH "Q" Resonant TX/RX antenna system
By QRQcw
  • 70 views
1:12
82 hertz ELF - if its good for Submarines, is it good for THROUGH THE EARTH CAVE to SURFACE COMMs ?
By QRQcw
  • 274 views
0:34
TTE Through The Earth Cave Radio MULTiPLE VLF Frequency Beacon: to determine best VLF freq for COMMs
By QRQcw
  • 87 views
6:35
High "Q" 'Tuned' Large Ferrite Rods VLF Transmit Antenna for PULSE DENSiTY MODULATiON CW MODE keying
By QRQcw
  • 175 views
2:47
ZAMGATE QRQ CW WAVEshape Restorer - fixes problem of narrow band high Q CW filter RiNGing/distortion
By QRQcw
  • 52 views
1:30
RTTY ULF Transmitter/Receiver using FLdigi and 4 tuned Ferrite Rod Antennas: Through The Earth COMMs
By QRQcw
  • 160 views
5:27
setup a CW COPY BY EAR practice session on the VLF band using unixCW, Gstreamer & 2 Ferrite Antennas
By QRQcw
  • 43 views
1:38
add monitoring of the FLDigi original sidetone to the 21Khz Gstreamer Script - LiVE DEMO
By QRQcw
  • 9 views
3:58
FLdigi VLF CW Transmitter(21Khz) on a Raspberry pi4 using its own analog headphone jack & Gstreamer
By QRQcw
  • 88 views
5:18
sending multiple ascii TEXT FiLEs over VLF: 7 streams, 200hz apart, centered at 21Khz by ENB-CW mode
By QRQcw
  • 48 views
5:16
OFDM500F - 21Khz - VLF Transmitter - by FLdigi on a Pi4, using a Large FERRiTE ROD Transmit ANTENNA
By QRQcw
  • 64 views
4:17
Large Ferrite Rod TRANSMiT Antenna for 21Khz on the VLF band - high Q resonant tuned input & output
By QRQcw
  • 400 views
3:39
MFSK22 DiGiTAL MODE VLF Transmitter & Receiver: SoundCard SDRs, FLdigi, RECRi KEYER & tuned ANTENNAs
By QRQcw
  • 71 views
4:37
Multi-Mode 20.2 kHZ VLF Transmitter & Receiver - LiVE demo of CW, PSK63F & LSB using Sound Card SDRs
By QRQcw
  • 174 views
0:57
40 foot long square induction perimeter loop wire, self resonant @85Khz for an AM Transmitter @85Khz
By QRQcw
  • 93 views
2:37
x42 Digital Peak Limiter Plugin AGC for an induction Loop diy Soundcard Sdr Receiver Ferrite Antenna
By QRQcw
  • 64 views
0:57
Surface to Underground Cave 76.5Khz SSB Digital Voice Transmitter with induction Wire Loop Antenna
By QRQcw
  • 72 views
3:59
STEREO induction Loop Transmitter & Receiver/Speaker Wire/CLASS D amp/ USB modulation @14Khz & 35Khz
By QRQcw
  • 47 views
1:31
HAM RADIO - QPSK31 vs ENB-CW mode - LiVE side by side test
By QRQcw
  • 75 views
3:25
soundcard SDR VLF 30kHZ CW Transmitter & Receiver - LiVE DEMO
By QRQcw
  • 265 views
2:21
CAVE RADIO BEACON/ 30kHZ\ using HiGH Q Ferrite Rod TX/RX Antennas: TX pulse is only 1 ms long/second
By QRQcw
  • 100 views
1:29
unixCW sending CW @30kHZ on VLF BAND using ALSA LOOPBACK cables - TX/RX demo using FERRiTE ANTENNAS
By QRQcw
  • 49 views
1:33
QRQ CW over 100 wpm - FLdigi decoding a CW station sending at 170wpm on 30kHZ VLF Band
By QRQcw
  • 108 views
2:29
Pulse Density Modulation battery powered 30Khz CW VLF Transmitter - 1/10th power drain of A1-MODE CW
By QRQcw
  • 64 views
4:15
TRiPLE RESONANT TUNED High "Q" TX & RX Large Ferrite Rod Antennas for VLF CW operations - LiVE DEMO
By QRQcw
  • 171 views
2:14
Square Wave to SiNE WAVE CW audio filter converter using a large FERRiTE ROD double tuned to 800 hz
By QRQcw
  • 80 views
3:55
Large Ferrite Rod Transmit Antenna for Pi4 VLF CW Transmitter - series & parallel tuned for MAX OUT
By QRQcw
  • 306 views
4:27
Extreme Narrow-Band CW VLF ENB-CW encoder\Transmitter & Receiver/decoder: Through the Earth COMMs
By QRQcw
  • 61 views
4:21
full duplex DUAL BAND{ULF & VLF} BPSK63F text messaging: for Cave to Surface Through the Earth COMMs
By QRQcw
  • 40 views
1:55
EasyDRF Digital Voice over the ULF BAND for Cave to Surface Through the Earth(TTE) Communications
By QRQcw
  • 143 views
2:45
using BPSK63F(F=forward error correction) to text message on the ULF band: Cave to Surface TTE COMMs
By QRQcw
  • 66 views
6:08
Pulse Density Modulated HF CW Transmitter/afcw mode\ {Saves Battery Power !} for portable operations
By QRQcw
  • 54 views
6:49
Pulse Density Modulated ULF CW Transmitter{Saves Battery Power !} for Cave Radio TTE communications
By QRQcw
  • 63 views
2:54
Raspberry Pi GPSK31 Modem 15kHZ VLF Transmitter for Through the Earth TEXT messaging Communications
By QRQcw
  • 108 views
2:26
Raspberry Pi digital voice VLF Transmitter using EasyDRF via WiNE - through the earth Communications
By QRQcw
  • 69 views
3:07
SEND a Picture over VLF band using EasyDRF by DazDSP for CAVE to Surface 'through the earth' COMMs
By QRQcw
  • 101 views
5:52
Digital VOiCE Modulation @16kHZ using EasyDRF from DazDSP for a CAVE to Surface - Radio Transceiver
By QRQcw
  • 83 views
7:01
Analog VS Digital VOiCE modulation for a CAVE RADIO through the earth Transmitter & Receiver @ 15Khz
By QRQcw
  • 48 views
1:55
Secure Communications for Persecuted Christians: Digital VOiCE on VLF band using EasyDRF from DazDSP
By QRQcw
  • 78 views
1:31
Digital VOiCE on VLF band using EasyDRF from DazDSP - LIVE demo @19.2kHZ LSB Modulation/demodulation
By QRQcw
  • 48 views
11:06
33Khz AM modulated induction loop perimeter wire, sound CARD SDR Transmitter & Receiver - LIVE DEMO
By QRQcw
  • 154 views
3:00
QUISK SDR APP as an induction hearing loop Receiver - demodulating 21Khz LSB from a loop transmitter
By QRQcw
  • 65 views
3:15
CLassRoom DEMO Setup for Teaching SDR RADIO: Pi4, VLF induction loop TX antenna, Ferrite RX antenna
By QRQcw
  • 52 views
1:44
Secure Communications for Persecuted Christians: AOiP by SEREN APP with multiple layers of security
By QRQcw
  • 80 views
1:33
Secure Communications for Persecuted Christians: hiding LiVE TEXT messaging over iP in WHiTE NOiSE
By QRQcw
  • 52 views
1:07
Secure Communications for Persecuted Christians: 38Khz FM modulation over iP with a 19Khz pilot tone
By QRQcw
  • 72 views
2:21
Homebrew LPAM 32Khz VLF AM Transmitter/Sound Card input through a FERRITE TOROID step-UP Transformer
By QRQcw
  • 122 views
2:14
Secure Communications for Persecuted Christians: Encrypted Hardware/software 32Khz iP AM-TRANSCEIVER
By QRQcw
  • 59 views
1:04
VLF TRANSCEiVER that hooks up to your sound card's LiNE input/LiNE output for QSO'n 32Khz AM over iP
By QRQcw
  • 182 views
1:08
Secure Communications for Persecuted Christians: Hiding a sensitive audio messsage into a Recording
By QRQcw
  • 81 views
1:28
iPHONE 17Khz VLF over iP AM-SSB Receiver - Sonobus carries the VLF signal, AM-Detector demodulates
By QRQcw
  • 102 views
6:50
QRQ CW 'copy by ear' PRACTICE via an online RADIO STATION(mp3) and via iCW MUMBLE(OPUS) - LIVE DEMO
By QRQcw
  • 350 views
3:10
DiY Secure VOICE CHAT over iP by Gstreamer, FLAC, SRTP, AES256, Zero-Tier using a Virtual Sound Card
By QRQcw
  • 111 views
2:06
DiY p2p Voice Chat, multiple layers of security: AES256, ZERO-TiER, with hidden 12kHZ USB modulation
By QRQcw
  • 66 views
3:14
Stealth 'hidden' text message data Encryption encoded/decoded onto/from a 3kHZ VLF RF CARRIER wave
By QRQcw
  • 105 views
1:54
use iPHONE via SonoBus, as a remote MiC & SPEAKER(over iP) for a Pi4 encrypted audio conference CALL
By QRQcw
  • 1.6K views
2:21
Raspberry Pi4 AM Transmitter(300Khz) & laptop AM Receiver with low latency up/down conversion by SDR
By QRQcw
  • 145 views
5:56
UNiXcw & the FASTLOOP alsa loopbacks for a QRQ CW copy by ear practice session from 100wpm to 135wpm
By QRQcw
  • 58 views
1:43
QRQ CW - AM Modulated @64Khz - demod by Rohde's Detector circuit, filter output through W3NQN filter
By QRQcw
  • 48 views
4:05
VLF SDR Receiver software that uses the Sound Card - CW DEMO - 24 signals from 500hz to 23500 hz
By QRQcw
  • 340 views
5:17
Morse Code Practice by a TCP/iP/Pi4 Server - 24 SPEEDs from 20-90wpm on 24 different VLF frequencies
By QRQcw
  • 123 views
2:19
setting up a Morse Code Practice Session with QUiSK SDR(RX) & multiple unixCW(TXs) using ENB-CW mode
By QRQcw
  • 74 views