Hi Trond and all, I did a complete 24 hours a day monitoring from 23 November to 23 December, recording in a 6 hours stereo wave files all the activity below...
Last night (night of 1-4-03) there were whistlers occurring with a strength of about an S3 in northern Colorado. These whistlers nearly all had echoes to them....
989
Shawn Korgan
vlfkorgan1
Jan 6, 2003 8:07 pm
Greetings all, There is a lot of hype regarding a new type of transistor on the internet. This transistor is simply termed the SET or single-electron...
990
Renato Romero
openlab@...
Jan 6, 2003 10:18 pm
A new update of OpenLab is on line: "What and Where is the Natural Noise Floor?" by John Meloy, AJ6LS 73, Renato Romero...
991
Mark <mdennisond@....
marky26_uk
Jan 8, 2003 9:23 pm
Hi all, Just made up a loop 1 metre in diameter. I got it hanging in the bedroom at the minute & getting some bad inteference from the tv downstairs. Can...
992
Jean-Louis.RAULT@...
Jan 9, 2003 3:39 pm
How many turns ? Cheers Jean-Louis F6AGR...
993
mdennisond@...
marky26_uk
Jan 9, 2003 4:46 pm
Hi, The loop is 4 pair telephone cable with 8 loops so making 64 turns in total. Mark. [Non-text portions of this message have been removed]...
994
mdennisond@...
marky26_uk
Jan 9, 2003 4:51 pm
Hello again, Just an update. I here more distinctive popping sounds with the loop than with the whip. Mark. [Non-text portions of this message have been...
995
Shawn Korgan
vlfkorgan1
Jan 10, 2003 5:24 pm
Greetings Mark & group, I have always used whip antennas for my setup at home and away from home. I use several 8' whip antennas from Radio Shack electrically...
996
mdennisond@...
marky26_uk
Jan 10, 2003 6:29 pm
Thanks for that info Shaun. I'm gonna mount the loop outside soon & then do some comparisons between the loop & whip. Thanks again, Mark. [Non-text portions of...
997
James C. Roberts <...
xeno_tropic
Jan 13, 2003 2:53 pm
I have heard that the sap running through trees produces VLF that can be picked up by a radio receiver. Is this true, and, if so, does anyone have any audio...
998
Eric Vogel
evogel99
Jan 13, 2003 3:54 pm
That's fascinating. Do you have any references? ... From: "James C. Roberts <xeno_tropic@...>" <xeno_tropic@...> To: VLF_Group@yahoogroups.com ...
999
Joseph DiVerdi
diverdi@...
Jan 13, 2003 4:32 pm
I've been working on a VLF Software Receiver and although the project is not yet complete I thought it would be a good time to write a short note describing...
1000
James C. Roberts <...
xeno_tropic
Jan 13, 2003 4:52 pm
... No, I had a phone conversation with a gentleman who is the head of some Longwave Radio group (before everything was online). I was seeking info on building...
1001
Shawn Korgan
vlfkorgan1
Jan 15, 2003 6:14 am
Greetings, Currently, I'm using a small pine tree as my VLF antenna and I have never noted any type of sound(s) originating from the sap within the tree. Out...
1002
Shawn Korgan
vlfkorgan1
Jan 15, 2003 3:18 pm
Professor Donald Gurnett has graciously uploaded a page of sample sounds as received by satellites orbiting the earth. A great example of what proton...
1003
Jean-Louis.RAULT@...
Jan 15, 2003 3:32 pm
For your information, we are studying the feasibility of installing a VLF receiver onboard the french amateur radio satellite SATEDU we are presently ...
1004
William
hayes74us
Jan 15, 2003 4:18 pm
WHAT IS THE FREQUENCY RANGE? I WOULD LIKE TO SEE SOMETHING LIKE 20HZ TO 200KHZ. THANKS , BILL HAYES ... From: Joseph DiVerdi <diverdi@...> To:...
1005
Shawn Korgan
vlfkorgan1
Jan 15, 2003 8:01 pm
I ran across a web site that offers technical information for those who are interested in building loop antennas:...
1006
Joseph DiVerdi
diverdi@...
Jan 15, 2003 8:25 pm
... Dear BILL, I'm planning to operate in the range 10-100kHz and hope you're content with that. ;) Best regards, Joseph -- Joseph A. DiVerdi, Ph.D., M.B.A. ...
1007
Michael Wheeler
mike_wheeler@...
Jan 16, 2003 7:02 am
... with that. ;) ... I hope that little winky means your answer was tongue-in-cheek? You will skip the lowfer's VLF and also the interesting area of 170 to...
1008
Joseph DiVerdi
diverdi@...
Jan 16, 2003 7:25 am
... Actually, it was tongue-in-cheek but not for that reason. I understand that my project will not provide coverage of *all* interesting VLF bands. My primary...
1009
Johan Bodin
junkodyn
Jan 16, 2003 2:49 pm
Joseph, Have you considered using an ADC followed by one or more digital downconversion chips? I am planning to build a "digital" LF receiver using an AD9260...
1010
Joseph DiVerdi
diverdi@...
Jan 16, 2003 3:05 pm
... Dear Johan, And a very good one indeed. I have considered (and studied!) several of the digital downconversion chips to learn about them and their...
1011
Shawn Korgan
vlfkorgan1
Jan 17, 2003 5:47 pm
Group, I ran across several web pages which describe synchronous-line noise blankers which appear to be very promising for VLF noise elimination. I will...
1012
Joseph DiVerdi
diverdi@...
Jan 17, 2003 6:00 pm
... Dear Shawn, These SLNBs do look promising especially if they ease the restrictions on the location of an antenna/receiver pair. Please do keep the list...
1013
Eric Vogel
evogel99
Jan 17, 2003 7:25 pm
Great! I have my fingers crossed that this will work well. Thanks for taking this on. Eric Eric Vogel...
1014
pseudospark <shans...
pseudospark
Jan 18, 2003 6:25 pm
While browsing through a local surplus store this AM I came across a "Model VS-68B High Impedance Hushed Transitor Amplifier" made by Millivac Instruments of...
1015
Joseph DiVerdi
diverdi@...
Jan 18, 2003 9:04 pm
... Dear Shawn, I was thinking a bit more about these noise blankers and realized (duh!) that they *require* a source of line power to derive the synchronizing...
