VLF1.ZIP GUIDE TO FILES CONTAINED IN THIS ZIP FILE:

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All Natural Radio recordings were recorded by Stephen P. McGreevy

using the McGreevy WR-4B E-Field VLF receiver and 10' (3 meter)

vertical antenna.  Tape recorder used was a Marantz PMD 212.

Files were converted to .WAV files using a SoundBlaster 16

card and Wave 'OLE or WaveEditor. The following files were

recorded at 8 bit, 11 kHz sampling rate.  (The antenna and front-

end circuit of the WR-4B whistler receiver was temporarily attached 

to my van via bungee cord) and the control box sits next to beds in back.





1)  HUGH_WHI.WAV 	Huge whistler (very strong), moderate diffusion

	7.5 sec.	recorded 17 Sept. 1993 20 mi. west of Wendover,

			NV at around 6:30 am PDT (1330 UTC).



2)  LOUD_WHI.WAV	Another strong whistler, same location as above

	8.5 sec.	within 10 minutes of the other one.  Initiating

			sferic "tweek" clearly obvious!



3)  LOUDWHI2.WAV	VERY LOUD Mod. diffusion whistler with weak

	9 sec.		diffuse echo accompanied by triggered emissions

			at time of whistler.



4) PURENVWH.WAV		04 June 1993, 60 miles NNE of Reno, NV, 1430

	19.5 sec.	UTC, 7:30 am PDT.  Weak Dawn Chours (minor 

			mag. storm in progress with weak background

			layer of sferics plus very strong sferics

			from lightning within 100 mi. of receiver.

			A strong, pure whistler of slow descending

			rate occurrs after one of these semi-

			local lightning sferics.



5)  WHIS4194.WAV	01 April 1994, 1130 UT/0330 PST, 100 mi. north

			of San Francisco, CA  in Mendocino Co. (Fish

	12.5 sec.	Rock Road 20 mi. west of Ukiah).  Clusters

			of nearly pure whistlers occurred  all night

			and were quite beautiful!  This segment has

			2 strong and 2 very weak whistler.





Natural Radio emissions such as these occur in the 0.1 to 11 kHz radio

spectrum--essentially, they are audio-frequency radio waves!  This is

just a small variety of fascinating "sounds" to be received at these

ELF/VLF frequencies.  You must be located at least 1 to 2 miles from

any power-lines so their "hum" is not received.  This is why I like

to listen in the NV high-desert and Great Basin Area--plenty of open

spaces!



A hand held version of the WR-4B is available for $105.  Contact 

Steve McGreevy at: S.P. McGreevy Productions, 45 Elda Drive, San

Rafael, CA  94903.  E-mail: spmcgrvy@ix.netcom.com -- or --

s.mcgreevy@genie.geis.com