http://groups.yahoo.com/group/VLF_Group/ Natural Radio VLF Discussion Group Sat, 18 May 2013 18:14:47 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21492 http://groups.yahoo.com/group/VLF_Group/message/21492 ... It's not you John - the images really are dark. I will try some different settings. -- Paul Nicholson -- Sat, 18 May 2013 17:32:23 GMT thb201 http://groups.yahoo.com/group/VLF_Group/message/21491 http://groups.yahoo.com/group/VLF_Group/message/21491 Is it just me or do others have trouble viewing the spectra on Paul's site? The thumbnails look OK but when I open the image up it's very dark and I can Sat, 18 May 2013 12:34:17 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21490 http://groups.yahoo.com/group/VLF_Group/message/21490 Interesting about the bats being drawn to the receiver. One of my projects this summer is to detect seepage locations around the nearby reservoir. I plan to Sat, 18 May 2013 12:09:51 GMT drobnock http://groups.yahoo.com/group/VLF_Group/message/21489 http://groups.yahoo.com/group/VLF_Group/message/21489 Hi The attraction of Fauna by a VLF receiver is not new; it was reported August 1996 at METEORBS. Thomas Ashcraft designed a receiver and antenna based on an Sat, 18 May 2013 08:44:23 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21488 http://groups.yahoo.com/group/VLF_Group/message/21488 But does Mars have a fairweather field to provide the 'polarising'? I notice that insect noises are worse on thin antennas such as a telescopic whip, much less Sat, 18 May 2013 08:36:04 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21487 http://groups.yahoo.com/group/VLF_Group/message/21487 ... I have http://abelian.org/vlf/tmp/sid130513b_DCF.gif http://abelian.org/vlf/tmp/sid130513b_DHO.gif http://abelian.org/vlf/tmp/sid130513b_GBZ.gif Sat, 18 May 2013 08:17:30 GMT Jean-L. RAULT http://groups.yahoo.com/group/VLF_Group/message/21486 http://groups.yahoo.com/group/VLF_Group/message/21486 During several VLF campaigns in the country, I experienced various noises generated by bluebottles, honey bees, horseflies, roe deers and farmers. And the Sat, 18 May 2013 06:28:36 GMT dl1eds http://groups.yahoo.com/group/VLF_Group/message/21485 http://groups.yahoo.com/group/VLF_Group/message/21485 Paul, looking at my GBZ-recordings of that event series on May 13 I noticed a sudden drop of the phase at 12 UT - coinciding (maybe by chance) with the start Sat, 18 May 2013 01:22:44 GMT SWPC Product Subscription Service http://groups.yahoo.com/group/VLF_Group/message/21484 http://groups.yahoo.com/group/VLF_Group/message/21484 Space Weather Message Code: SUMSUD Serial Number: 171 Issue Time: 2013 May 18 0121 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2013 May 18 0112 UTC Sat, 18 May 2013 00:57:34 GMT thb201 http://groups.yahoo.com/group/VLF_Group/message/21483 http://groups.yahoo.com/group/VLF_Group/message/21483 I did some quick and dirty audio processing on these files so I could hear the bird sounds better. On file 1368458772 just fraction of a second before the Thu, 16 May 2013 23:24:09 GMT Adrian Flynn http://groups.yahoo.com/group/VLF_Group/message/21482 http://groups.yahoo.com/group/VLF_Group/message/21482 What do you call a "Light" wind? Where I was living in Arizona a 35 MPH wind is a "Light" breeze. and a heavy wind was anything over 60 MPH, and this is no Thu, 16 May 2013 21:37:07 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21481 http://groups.yahoo.com/group/VLF_Group/message/21481 ... Probably, if the antenna is displaced uniformly horizontally. But if the base is fixed and the top is wobbling, the capacitance will be modulated and Thu, 16 May 2013 21:30:22 GMT Tom Becker http://groups.yahoo.com/group/VLF_Group/message/21480 http://groups.yahoo.com/group/VLF_Group/message/21480 ... providing the polarisation... Interesting notion. If an E-field antenna moves vertically through a 100V/m gradient, there certainly should be resulting Thu, 16 May 2013 21:28:31 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21479 http://groups.yahoo.com/group/VLF_Group/message/21479 ... Thanks, I'll try to get a bearing on this one and the one on 04-19. Do we have anyone else with orthogonal loops in Europe? We really need a cross bearing Thu, 16 May 2013 21:16:20 GMT Paul http://groups.yahoo.com/group/VLF_Group/message/21478 http://groups.yahoo.com/group/VLF_Group/message/21478 ... Darn. I thought we had an exotic pattern of triggered emission. Here, I get screech owls perching on the antenna. They like to perch and they like to