Welcome to the realm of extreme and very-low-frequency (ELF/VLF) "Natural Radio!" The WR-3 is an electric-field ("E-field") type of "whistler receiver" specifically designed to monitor naturally-occurring VLF radio emissions of Earth that occur in the 300-11,000 cycles-per-second (0.3-11 kHz) audio-frequency ELF/VLF radio spectrum.
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Sferics | Tweeks | Whistlers | Dawn/Auroral Chorus | Space-Weather Prediction Websites | Best Times to Listen | Russian Alpha Radionavigation Signals | Finding Listening Sites | Insect Wing Noises | About Headphones and Speakers for the WR-3 | Recording with the WR-3/ | Receiver Specifications | Quick Tips | ANTENNA
#VLF RECEIVER SENSITIVITY PLUS#
One or two series 47 K resistors(s) plus a parallel termination-resistor of 1K suffices fine for interfacing the WR-3 joint 3.5mm audio-output jack (headphone level audio) of the WR-3 to the mic-level input of PCs and phones so you may employ their recording apps! (Stephen P. the lowest conductor closest to the "holder" of the plug (3.5 mm type/4-conductor) is the mic-level connection).
#VLF RECEIVER SENSITIVITY HOW TO#
about how to interface the WR-3 output jack to the newer PC/phone 4-conductor jacks that combine stereo audio outputs with a monoural mic-level input (i.e. Information for recording using Sony Mini-Disc (MD) recorders and memory-chip-recorders (like my Zoom H2 employing an SD-card) has been added to the Recording section. This WR-3 Receiver booklet/guide is also highly useful for all Natural Radio listeners due to its interesting information pertaining to Natural VLF Radio that I have been compiling since 1991. This WR-3 Listening Guide was first begun in mid-1991 and updated as of
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THE POCKET-PORTABLE WR-3 NATURAL-VLF-RADIO PHENOMENA RECEIVER There has been an optional FSK demodulator Fs Tg 127 for the reception of radioteletype signals and a BP 102 single sideband demodulator to match the E 108.WR-3 VLF Receiver Listening Guide / Natural VLF Radio Listening Guide filter bank, the signal is fed to the AM detector, a BFO can be used to receive CW and single sideband signals. of 80 kHz in the ranges 1, 4 and 5 and 320 kHz in the ranges 2, 3 and 6, the second intermediate frequency is 525 kHz, the same as found in the E104 shortwave receiver.Īfter having passed the I.F. The receiver acts as a double conversion receiver with a first I.F. Below, You find the main tuning knob (with a coarse and fine tuning speed) and the rugged bandswitch, underneath an antenna switch to change from a long wire and 60 Ohms coaxial antenna to a DF frame antenna.
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In the right lower quadrant of the receiver's front panel, you find the signal strength meter which can also be set to display the AF level. In the middle row, you find the control to adjust the level of the line out output and the AGC time selector and in the bottom row the bandwidth selector and the controls for audio and radio frequency (RF Gain) gain. In the left lower quadrant of the front panel, you find the rotary controls in three rows: the BFO control with it's +/- 3 kHz range, the crystal calibrator switch and the reception mode selector combined with the mains switch. The top third of the frontpanel is taken by the linear dial. The receiver can be powered from different AC voltages from 110 to 240 V. This receiver is extremely bulky and heavy, it's 555 x 480 x 590 mm wide and in it's desktop cabinet, the receiver has a weight of 75 kg - this will be the reason, many of the receivers have been cleared out. The VLF - mediumwave receiver E 108 covering 10 -1800 kHz in six ranges is a very near relative to the Telefunken E104 shortwave receiver with a similar design.