About The Radio

The InfraSignal Radio is an extremely low frequency (ELF) radio receiver with Built-In-Test, Alarm, and Safety functions. Depending on the type of connected signal sensor (detector), the radio can be used for a number of purposes.


When the radio is used with a seismic (ground vibration) sensor, it can detect the early signs of a developing landslide. The United States Geological Survey (USGS), Federal Emergency Management Agency (FEMA) and Centers for Disease Control (CDC) websites report lots of warnings signs before a landslide occurs. All of these warning signs involve small movements and vibrations in the ground. See (MUD, ROCK, LANDSLIDES).


The radio and seismic sensor system can also detect ground vibrations from other dangerous local sources such as Rockslides, Mudslides, Flashfloods, Tsunamis, Earthquakes, Volcanoes and Tornados touching the ground.


When used with the electromagnetic pulse (EMP) sensor, it can detect both Solar EMP and Nuclear EMP. See (SOLAR ACTIVITY).


Other uses: When used with the seismic sensor, it can detect ground vibrations from pile driving, tunnel digging, oil well fracking, see (OIL WELL FRACKING video). When used with an infrasound microphone, it can help locate large animals in the wild such as elephants, etc. It can aid in the detection and location of mysterious infrasounds such as the wind blowing on a vibrating object. It can detect resonant signals and measure their frequency such as helicopters in flight. When used with an infrasound hydrophone, it can detect pressure waves from large ships propellers and alert small sailboats at sea. It can be used to listen to whales, both is the infrasonic frequency range and the audible frequency range. When used with a vary very large loop antenna, it can detect small fluctuations in the earth’s magnetic field during solar flares and aurora. And we are sure there are others.



Operators Manual, version r


InfraSignal Radio Specitications

  • 9 Modes of operation: Infrasignal on strip chart mode, infrasignal on scope mode, measure frequency in infrasignal mode, 1 channel in strip chart mode, 1 channel in scope mode, measure frequency in 1 channel mode, 5 channel scan mode, 16 channel scan and voice on VU meter modes.
  • 5 Adjustments: Backlight intensity of touch screen, alarm threshold, volume, squelch and tone.
  • 9 AGC options: Normal AGC, fast / slow AGC, fast / slow AGC discharge, hold AGC level 15 / 30 seconds and fast / slow AGC impulse response.
  • 4 Local alarm options: Enable alarm, disable alarm, alarm 50% volume and alarm 100% volume.
  • 2 Remote alarm options: External alarm enabled / External alarm disabled.
  • 4 built-in-test (BIT): Scan 16 test signal with test instructions, sinewave test signal with test instructions, measure frequency of test signal and alarm test.
  • 1 Calibration: LCD calibration, follow the on-screen instructions.
  • 2 Languages: English / Spanish.
  • 2 User guides: English user guide, Spanish user guide.
  • 2 Phone jacks: 1 phone jack for monitoring the output of the infrasonic modulator and normal voice audio on headphones and 1 phone jack for connecting the AGC leveled infrasonic signals output to a high input impedance infrasonic recorder or other device.
  • All modes, adjustments and optional settings are saved to memory and retrieved when the power is turned on. Two default exceptions, 1: The alarm is enabled and is set to 100% volume. 2: The Backlight intensity is set to maximum.
  • Input voltage range: +10 to +28 Volts DC.
  • Input current at +12 volts: 200 milliamps (ma).
  • Maximum peak input current during alarming conditions:                                                                    At +10 volts = 350 ma, at +12 volts = 300 ma, at +28 volts = 165 ma.
  • Infrasignal frequency range: 0.35 hertz (Hz) to 45 Hz.
  • Scan 16 channels frequency range: 1 Hz to 30 Hz.
  • Voice band frequency range: 300 Hz to 3 KHz.
  • Power line frequency notch filter: factory selected 50 Hz / 60 Hz.
  • 60 Hz power line frequency rejection: 50 decibels (dB).
  • Input sensitive: 3 microvolts minimum discernable signal (MDS).
  • Maximum low distortion input signal: 375 millivolts (mv) root mean square (rms) in the infrasignal frequency range of 0.35 Hz to 45 Hz.
  • Input signal low distortion dynamic range: 102 dB in the infrasignal frequency range of 0.35 Hz to 45 Hz.
  • Accuracy of frequency measurement: Infrasignal mode = @ 1 Hz +/- 0.03 Hz.  @ 45 Hz +/- 1.30 Hz.                                                                                                                    1 Channel modes = Channel 1 +/- 0.03 Hz, Channel 11 +/- 0.08 Hz, Channel 12 +/- 0.3 Hz, Channel 16 +/- 0.4Hz.
  • The radio has three signal inputs, one AC coupled, one DC coupled and one AC coupled to a +10dB amplifier for weak input signals.
  • Input impedance to all signal inputs, 2.0 Kilohms to radio’s virtual ground.
  • Case: splash proof, Size: 7.7” x 5.0” x 1.9”, Weight: 1.1 pounds