Vlf receiver circuit listen to meteor
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Is that there are portions of range as from chart that they reenter in the study of the anomalous phenomenons. Watches the television and she talks to the jail cell, by now the electronics is of house. Not to enter too much the difficulty, considers that every person uses day after day a ghost of radio frequency range or rather, she listens to the radio, russian radio ZEVSīrodcasting FM, Aeronautics, Navy, Police forces, Television, Radio-operator, Inspection piping, magnetic terrestrial field study To pickup from the North and South you would have to point the ends of your antenna to the East and West.ULF-ELF-VLF: You signal radio from the Earthīefore entering the technician I want to introduce the following There is no signal pickup from the North or South. Looking down from above with the ends of the antenna pointing North and South, just like a compass would, the directions of best reception are EAST and WEST as shown by the circles in the chart above. These antennas exibit a bi-directional reception pattern as shown above. This project is an un-tuned wideband VLF receiver so no tuning capacitor is needed. The receiver will go down to 1 Hertz, but you will have to increase the capacitor values and use many turns of wire (more than 2000) to get there. You may want to change C1 and C2 depending on the exact tone quaility you prefer.
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See antenna directional signal pick up diagram at bottom of this page. If the antenna is mounted vertically this will allow hearing local underground radio signals (from earthquakes), and eleminate all of the distant lightning static noise, including any tweeks and whistlers. VLF waves can travel through the Earth's soil and underground rivers. But this cutoff does not mean that nothing can be heard below 1600 Hz. The ionosphere propagation cutoff is approximately 1600 Hertz, which results in the "ping" sound of tweeks. This is the audio frequency range of the tweeks and whistlers. Tweeks travel EAST and WEST (mostly) so point the ENDS of the ferrite rod antenna NORTH and SOUTH so the flat broadside will pick up.įor best results use a "mid-range" type Hi-Fi speaker designed for the frequency range of 1000 Hertz through 5000 Hertz. Whistlers travel NORTH and SOUTH along the Earth's magnetic field lines so point the ENDS of the ferrite rod antenna EAST and WEST so the flat broadside will pick up. Whistlers and Tweeks are best heard after 9 PM your local time. Sudden LOUD feedback squeeling sound possible! If the unit squeels then you forgot to place R1, or the Antenna is too close to the speaker.Īdjust TONE Switch (SW1) as needed for most pleasing sound or signal strength.ĭo NOT use headphones or earphones, sudden very loud sound possible. It can be located a few feet above ground level away from power lines. Feedback squeel will result.Īntenna can be located remotely outdoors away from powerline noise by using microphone cable or twisted pair.Īntenna does not need to be up high for good reception. Keep the antenna 12 inches or more away from the speaker or speaker leads. WARNING! Do NOT use headphone or earphones. Use a "mid-range" type Hi-Fi speaker designed for the frequency range of 1000 Hertz through 5000 Hertz. SPKR: Any 8 ohm, 12 ohm, or 16 ohm Speaker greater than 3 inches diameter. Optional 200 ohm volume control resistor. VR1 (part not labled in diagram near speaker). Lower resistor values cut higher frequencies and general sensitivity. Adjust value higher or lower for best overall "tone". Q1, Q2, Q3, Q4, Q5: STORMWISE PART # 2N4124 NPN Transistors. The unit can be tuned by placing a capacitor across the antenna leads, but this will distort the pleasing sounds of the natural radio waves. The unit allows wide band (untuned) reception and features Hi-Lo tone control switch (SW1). This 5 transistor VLF receiver will drive a speaker. Listen to Whistlers, Tweeks, Auroras, Earthquakes, and other natural events that create VLF radio waves in the range of 100 Hertz - 10000 Hertz. This circuit is shown as an educational example only. There is no technical help with the projects. The following information is for educational and experimental uses only. (903) 383-7047 Build an VLF Whistler Receiver Home