DiY 'Through the Earth' Transmitter & Receiver

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using open source software and affordable consumer hardware to build VOICE & DATA ELF, ULF, VLF RF transmitters/receivers/transceivers for 'Through the Earth...
3:59
Double SideBand CAVE RADIO 'through the earth' Transmitter & Receiver: 44Khz, using FERRiTE antennas
By QRQcw
  • 256 views
2:49
SLF BAND 'Through the Earth' CAVE RADIO CW Transceiver using soundcard SDRs & tuned Ferrite Antennas
By QRQcw
  • 218 views
3:01
22kHZ, 250μs length pulse, 1PPS, VLF, {THROUGH THE EARTH} CAVE RADIO TRANSMITTER & RECEIVER Beacon
By QRQcw
  • 100 views
1:40
ELF through VLF UNiVERSAL Frequency CONVERTER to Morse Code AUDiO: by STEVE HARRiS's DiODE PROCESSOR
By QRQcw
  • 260 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
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
2:29
ELF soundcard SDR Receiver - processing a 23 hertz ELF CW SIGNAL: to help clean it up & sound better
By QRQcw
  • 359 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
2:54
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
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
  • 49 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
2:38
12 hertz, ELF, EMF, ENB-CW, QRQ Transmitter & Receiver: LIVE demo of an EXTREME NARROW BAND CW radio
By QRQcw
  • 189 views
2:12
infrasonic, 11hz, ELF EMF Through The Earth Cave Radio CW Morse Code Transmitter/Receiver LIVE DEMO
By QRQcw
  • 240 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
  • 180 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
  • 212 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
  • 295 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
6:04
VLF QRQ CW RX signal gets direct conversion to CW AUDIO by LSP Sine Wave Oscillator & Sidechain Gate
By QRQcw
  • 77 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
  • 75 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
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
  • 273 views
0:34
TTE Through The Earth Cave Radio MULTiPLE VLF Frequency Beacon: to determine best VLF freq for COMMs
By QRQcw
  • 86 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
  • 51 views
1:30
RTTY ULF Transmitter/Receiver using FLdigi and 4 tuned Ferrite Rod Antennas: Through The Earth COMMs
By QRQcw
  • 160 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
Surface to Underground Cave 76.5Khz SSB Digital Voice Transmitter with induction Wire Loop Antenna
By QRQcw
  • 72 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
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
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
6:49
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
2:21
Raspberry Pi4 AM Transmitter(300Khz) & laptop AM Receiver with low latency up/down conversion by SDR
By QRQcw
  • 145 views
1:34
pi4 DiY 'Through the Earth' CAVE RADIO 12kHZ VLF RTTY Transmitter & Receiver - LIVE demo
By QRQcw
  • 560 views
2:17
pi4 DiY 'Through the Earth' CAVE RADIO VLF Transmitter - 2 VOICE channels & 1 Data channel for text
By QRQcw
  • 499 views
1:32
iPHONE Mic + Sonobus = remote mic to a Raspberry Pi through the earth cave radio VLF Transmitter
By QRQcw
  • 169 views
2:42
Weak Signal RX & decode from a CAVE RADIO VLF TRANSMITTER using DominoEX Micro digital mode & FLdigi
By QRQcw
  • 114 views
6:24
Pi 4, Through the earth, VLF band, 17Khz Pulse Density Modulated CW Transmitter(saves battery power)
By QRQcw
  • 72 views
1:01
Raspberry Pi 4, Through the earth, VLF dual band, full duplex, CW Transceiver (TX @18Khz RX @10Khz)
By QRQcw
  • 77 views
3:15
Cave Radio Transmitter Beacon - uses a Raspberry Pi 4, a class D amp and one simple Gstreamer Script
By QRQcw
  • 60 views
4:43
Pi4 16kHZ AM Cave TRANSMITTER - VOICE & (Text Messaging by PSK31 modulation of the 16Khz AM carrier)
By QRQcw
  • 55 views
7:33
Pi4 CAVE Transmitter - VLF RF LSB Dual-Band - 9Khz & 14Khz - both VOICE & TEXT MESSAGING - LIVE Demo
By QRQcw
  • 71 views
2:04
FLdigi CAVE to SURFACE Through The Earth Text Messaging 2.3Khz EMF Comms System using DominoEX MICRO
By QRQcw
  • 69 views
4:24
FLdigi, bpsk31, 76hz CAVE to SURFACE, Through The Earth, Text Messaging ELF EMF communication system
By QRQcw
  • 30 views
2:04
using FLdigi for a CAVE to SURFACE, Through The Earth, Text Messaging ELF EMF communication system
By QRQcw
  • 54 views
2:02
CAVE to SURFACE radio COMMs - transmit HD Voice(8khz wide) - LIVE demo - 8Khz USB operations
By QRQcw
  • 66 views
2:06
CAVE to SURFACE radio COMMs - transmit TEXT & PICTURES via MFSK128 - LIVE demo - 8Khz USB operations
By QRQcw
  • 54 views
0:48
Through The Earth(TTE) 8Khz VLF USB Transmitter - Raspberry PI, Class D amp, Ferrite Core TX antenna
By QRQcw
  • 134 views
1:48
DIY QRQ CW VLF TRANSMITTER & RECEIVER for Spelunking Loving QRQ CW OPs: Through The Earth(TTE) comms
By QRQcw
  • 342 views
2:51
Through The Earth(TTE) 8Khz VLF CW Transmitter - Raspberry PI, Class D amp, Ferrite Core TX antenna
By QRQcw
  • 32 views
4:12
ULF CW Raspberry pi SDR Transmitter & Laptop SDR Receiver for TTE Radio Comms between Cave & Surface
By QRQcw
  • 111 views
2:15
83Khz Cave to Surface SSB Transmitter & Receiver: Transmitter uses a Tesla Coil Ferrite Core Antenna
By QRQcw
  • 65 views
4:19
Raspberry Pi 4 experimental Cave to Surface 14.6Khz SSB Transmitter - laptop soundcard SDR Receiver
By QRQcw
  • 72 views