Using your VLF receiver in Software

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Using your VLF receiver
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The whistler receiver works best out doors in open areas, with a vertical antenna of roughly 3 to 12 feet in height It can also be used in wooded or obstructed areas with wire antennas between roughly 50 to 200 feet
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Fourteen: VLF Radio Receiver
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on the time of day, but you can always expect some sharp, crackling static The intensity and volume of this static will depend on propagation conditions and where thunderstorms are in relation to your location Chances are that you ll also hear some power line hum, but hopefully it won t be very loud If your listening site is too noisy, you need to try another listening site If your ears have good high frequency response, you will probably hear a continuing sequence of one-second tones These are from the OMEGA radio-navigation system OMEGA is transmitted from 10 to 14 kHz, and OMEGA transmitters are very powerful You may also hear anything that can produce an electrostatic discharge, particularly if the humidity is low These miscellaneous noise sources can include wind noise, the buzz of insects flying near the antenna, dry leaves or grass moving, and even the electrostatic charges that build up on your clothing Passing vehicles will often produce noise from
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their electrical and ignition systems And if you have a digital watch, keep it away from the antenna or you ll be listening to it instead of whistlers! Anything you hear other than whistlers and related phenomena or OMEGA signals are likely to be the result of extraneous signals overloading your receiver Burbling sounds (possibly mixed with OMEGA tones) are caused by military signals in the 15 to 30 kHz range, perhaps overloading the receiver A ticking sound at a 10 Hz rate is from Loran-C radio-navigation signals at 100 kHz In general, don t be surprised if you experience overloading from transmitters operating on any frequency if they are within sight of the location where you re using your whistler receiver! Table 14-3 illustrates some very low frequency stations around the world that broadcast low frequency signals, these signals are located at the upper edge of the VLF receiver s range
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Table 14-3
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Very low frequency radio stations
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Site Cutler, ME Jim Creek, WA Lualualei, HI LaMoure, ND Aquada, Puerto Rico Keflavik, Iceland Niscemi, Italy Harold E Holt, Australia Rhauderfehn, Germany Rosnay, France St Assie, France Bombay, India Tavolara, Italy Ebino Huyshu, Japan Noviken, Norway Arkhanghelsk, Russia Batumi, Russia Kaliningrad, Russia Matotchkinchar, Russia Vladivostok, Russia Anthorn, United Kingdom JXN UGE UVA UGKZ UFQE UIK GQD ICV HWU FTA NWC ID NAA NLK NPM NML4 NAU NRK Frequency kHz 240 248 214 252 4075 375 399 198 185 151 168 151 2027 234 164 194 146 303 181 150 019 45 150* input pwr 100* input pwr 100* input pwr 100* input pwr 100* input pwr 42 43 100 100 25 1000 500 400 23 Power KW 1000 250 566
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Time of listening
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Most of the VLF signals, such as clicks, pops, and tweeks, can be heard almost at any time of the day or night Whistler occurrence is a function of both thunderstorm occurrence and propagation conditions through the ionosphere The rate is higher at night than during the day because of the diurnal variation in the D-region absorption, which is highest when the Sun is above the horizon At night, the D-layer does not exist since it is ionized by solar ultraviolet rays The whistler rate, or the number of whistlers heard per minute, has a marked dependence on sunspot activity, the rate increasing with the sunspot number Whistlers are heard only when sufficient ionization exists along the path to guide the waves along the Earth s magnetic field This ionization is assumed to be supplied from the Sun during a solar To hear a whistler or other signals such as dawn chorus, you will no doubt have to get away from the power line and industrial noise The listening time for these signals will be from near local midnight to early morning hours
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recorder away from the receiver to avoid picking up motor noise After returning home with your recording, if your receiver was out in the field, you can play your recording back into the sound card of your personal computer using an FFT or DSP sound recording program to analyze the recording For those who are going to use their whistler receiver as a stationary receiver at home, you could use your PC to record on a continuous basis Audio recording and FFT programs are available on the Internet for free Good luck and happy exploring!
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