During the daylight hours spherics can travel upwards of 2000 to 3000 kilometers from the source of the lightning strike. This phenomena can easily be seen on a SID receiver plot as a sharp rise in the received signal strength of a monitored VLF transmitter at dusk and the subsequent signal drop at dawn. This is due to the lack of ionizing radiation from the Sun during the night hours. At dusk the D layer (lowest layer) of the ionosphere fades away leaving the higher E and F layer only. During dusk, dawn and the intervening night hours the ionosphere goes through a transformation that has a profound effect on spheric activity. Thankfully, there is more to natural radio than just spherics. Yes I agree, after a short while spherics can get very boring. Ok, you might be asking yourself what’s the big deal about popping sounds from lightning in the VLF band anyway. That is if you don’t want to build your own receiver. I recommend this receiver for anyone interested in getting into this hobby. The VLF-3 kit which they provide is of very good quality and easy enough for just about anyone to build in a few quiet nights in the radio shack.
The Inspire Project is a NASA sponsored (among others) project involved with interactive NASA space physics ionosphere radio experiments. Another option is the VLF-3 from the Inspire Project. I’m currently using a homemade receiver for this project which I detail below. As a matter of fact the Schumann resonance receiver which I use, found here, can easily be modified to receive the entire VLF band. Over the years I have built a number of VLF receivers of the E-field and loop antenna type. I have been interested in natural radio for a good ten years now. So it shouldn’t surprise anyone that another name for this hobby is “natural radio”. These types of wide band signals are characteristic of natural EMF activity from Earth as well as our solar system and beyond. This is because a lightning strike is not a narrow band event as is say a military VLF transmitter like NAA in Cutler Maine at 24KHz. Spherics show up as wide band bursts when plotted on a spectrogram. These are the most common sounds heard on the VLF band and can be heard 24 hours a day. Once I get an idea of where to listen, then I can work on setting up the equipment and buying/building the antenna.The snap, crackle, and pop sounds from lightning activity which one can hear on a VLF receiver, or AM and short wave radio for that matter are called atmospherics or spherics for short. If there's any "always on" frequencies to try for listening to meteors via radio then please lemme know. I've scoured for resources but am coming up with frequencies no longer used or used in Europe (a bit of a ways away from Knoxville). I saw a wiki page that NAVSPASUR was discontinued but I don't trust anything wiki although this article seems to confirm it was shutdown last October. I was investigating the NAVSPASUR (Naval Space Surveillance) radar on 216.980 MHz.
#Vlf receiver listen to meteor tv#
Now that TV has gone from analog to digital, the audio carriers around 6m are no longer used, except for the LP stations that are too weak to pick up. The same with most FM broadcast frequencies in this area. I live in Knoxville, TN and I considered NOAA weather radio but all the frequencies that are used, I can hear or pick up some noisy intelligence on those frequencies. The biggest issue is what frequency to listen to that's always transmitting, beyond line-of-sight, and within the frequency range optimal for listening to radio meteors.
#Vlf receiver listen to meteor how to#
I don't want to use internet radio because, well, internet! I'd like to be able to tune in day and night to experiment with how to listen for them. I'd like to be able to listen to a meteor shower using my Yaesu FT-100D radio to listen to the "pings" and "boings" of the meteors ion trails as they skim the atmosphere.
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