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Subj: Updated on Utah LowFER beacons
Date: 00-03-30 16:54:12 EST
From: turner ussc (C Turner)
In case you don't hear it from Pete Smith, K7ZTM directly, I thought
that I'd mention that the ZTM LowFER beacon (183.5 KHz from Layton,
Utah) is off the air for the summer.
Clint
KA7OEI
Subj: K0LR web page update
Date: 3/29/00 12:03:06 PM Eastern Standard Time
From: lyle mlecmn (Lyle Koehler)
To: lowfer qth.net, LWCANews
I've added an article called "Computer Modeling of LowFER Transmitting
Antennas" to my web site. The article includes a brief overview of three
of the popular MININEC-based antenna modeling software packages (AO,
ELNEC and NEC4WIN). There is a more detailed discussion of modeling
methods and results using AO (or the freeware NF software, which has
almost all the functionality of AO). I've included a zip file which has
a number of LowFER antenna models written for AO/NF. Two of the models
deal with identical LF antennas spaced a short distance apart and fed in
phase, which was the subject of some recent discussion on the lowfer
reflector.
There is also an update to the "Listening for LowFERs, Part 1" article
giving more details about the balanced loop I'm currently using.
--
Lyle, K0LR
http://www.computerpro.com/~lyle
Subj: RE: ELF Transmissions
Date: 3/28/00 5:12:45 PM Eastern Standard Time
From: ollaneg zeta au (Steve Olney)
G'day Frank,
I too am interested in these frequencies. Here are some links that you
might find useful:
http://www.zeta.org.au/~ollaneg/uevlf.htm
and
http://www.wireless.freeserve.co.uk/
Regards Steve Olney VK2ZTO
Subj: RE: Cave Radio
Date: 3/28/00 4:25:27 PM Eastern Standard Time
From: tomaskod smtplinkeadanlgov (David Tomasko)
Hi Thomas,
You might want to check the following WEB site for info on inductive
cave radios.
http://www.sat.dundee.ac.uk/~arb/creg/designs.html
It has some very interesting information.
Dave Tomasko
Subj: Cave Radio
Date: 3/27/00 5:13:10 PM Eastern Standard Time
From: ThomasBrackman wkuedu (Thomas Brackman)
LFs:
I am looking for a cave radio to locate caves from the surface to drill
monitoring wells into them. Average depth is about 100 ft with some about 200
ft. I need the name of someone who will make one complete in working order, or
in-depth instructions for building one. Someone close to Bowling Green,
Kentucky would be nice. Any help will be greatly appreciated.
Thomas Brackman
Research Hydrologist
The Center for Cave and Karst Studies
Department of Geography and Geology
Western Kentucky University
1 Big Red Way
Bowling Green, Kentucky 42101
270-745-3252
Subj: SAQ again.
Date: 3/27/00 9:08:46 AM Eastern Standard Time
From: sm6hcj seasidese (Karl-Olof Wiman (EMW))
Next transmission of SAQ (17.2 kHz) is July 2, 2000, when the station celebrates its 75th birthday !
I have received confirmation:
There will be transmissions July 2, 2000 from the Grimeton alternator at 17.2 kHz.
There will be three (3) transmissions over a 24 h. period. Each will contain a message,
repeated twice.
There will be maintenance work being done on the antenna this
summer (really needed.
I live 4 km = about 2.5 miles from Grimeton, and I can see the
antennas from the roof of my home. I also was an operator of
the shortwave amateur 'listen-report' station 7S6SAQ during
the millenium transmission. If You want t e-mail me, please
do not send a reply to my work, but directly to my home:
sm6hcj seaside.se
Regards, 73's
Karl
(present holder of amateur radio calls SM6HCJ and 8S6W)
Subj: Equinox Coordinated Listening Results
Date: 00-03-25 15:58:41 EST
From: sratzlaf flash (Steve Ratzlaff)
I hope a lot of you went out the past 2 weekends to participate in
Mark's revived Natural Radio Coordinated Listening event. (Mark Karney, Natural Radio editor for The LOWDOWN.)
It will be interesting to find out who all heard what!
I listened Sat. 3/18, and again this morning, Sat. 3/25. I'm in the San
Francisco Bay area, California. I used a simple efield receiver with
high pass filtering and a vertical 20' wire as antenna. My site is
perhaps 1/4 mile from a power line; use of the HPF makes listening
entirely acceptable.
I did no recording, but took detailed logs, using a stopwatch sync'ed to
WWV. Both sessions, I began about 5:45 a.m. local time and listened
about one hour.
3/18--Nothing at all was happening at vlf! During the brief darkness
period, a few tweeks. After sunrise the tweeks went away (normal). But
even background sferic activity was low.
WWV Flux 192 A 5 K 1
3/25--While setting up it was immediately apparent great things were
happening at vlf--a whistler storm was in progress! I started logkeeping
at 5:47 a.m.; when I ended at 6:52 a.m. I had noted approx. 500
whistlers heard. The most active minute was 5:50-:51, when 16 whistlers
were counted.
The first 50 minutes or so, the whistlers were all semi-diffuse, fairly
long 2-3 seconds. Most were weak to faint, with occasional medium and
loud strength ones. No sferics were associated with the whistlers, for
the most part. Later on, some pops and associated whistlers were heard.
Also some highpitched, rapid, low-dispersion whistlers. And some long
ones starting at high pitch descending way down to low pitch (for the
louder ones).
When I shut down at 7:10 a.m., the storm was still in progress, tho at
reduced level and frequency.
WWV F 219 A 9 K 2
This was an event not to be missed! VLF activity has been very poor the
past 6 months or so--it was very nice to finally get a decent morning of
activity. Thanks to Mark for reviving the Coordinated Listening,
otherwise I would not have made the effort to go out to listen.
It will be interesting to find what others heard.
Steve
Subj: VA off 'til fall
Date: 00-03-24 21:02:12 EST
From: n4zv roanokeinfi (Bart Prater)
Lowfer VA is off (and grounded) 'til fall.
Spring came early in Virginia this year... and with it a few very
aggressive thunder storms.
No damage so far, but since discretion is the better part of valor, I
think it's time to wimp out!
Thanks for the reports. See you guys next season.
73,
Bart N4ZV/VA
Subj: ELF transmissions
Date: 00-03-23 19:54:39 EST
From: hutchins strato (Frank Hutchins)
Hi, I am W2MAV, since 1939.
I am interested in what kind of transmissions and who might be experimenting on frequencies lower than 9 khz , I have always been interested in the low frequencies since I was a shipboard operator and used 22 khz during the world war.
Also, I gave a speech at our last club meeting on long waves and I have a prewar Navy receiver tuning to 15 khz.
I know the Navy is using ELF , extremely long waves for sub communications and I am interested in experimenting in the 200 Hz to 9000 Hz range.
Any info on these freqencies would be appreciated.
Frank Hutchins, Sebring, Fl.; Ensign, ret. U.S.C.G.
Subj: Re: EDN Article on RF Radiation
Date: 3/8/00 2:04:07 PM Eastern Standard Time
From: sm6pxj swipnetse (C Andersson)
Here it is:
http://www.ednmag.com/ednmag/reg/2000/03022000/05ms624.htm
And also in PDF.
73
sm6pxj
Subj: EDN Article on RF Radiation
Date: 3/8/00 11:51:33 AM Eastern Standard Time
From: WilliamAshlock edwardsboc (Ashlock,William)
There's an article in the March 2 issue of EDN (Electronic Design News) that
has an excellent description of how RF radiation occurs and the
characteristics of the radiation. This is the first thorough 'no math'
treatment of the subject that I have come across in many years and
particularly deals with low frequency radiation.
If there is enough interest I will contact EDN to determine if there is a
way of making the article available to this group.
Bill, WA
Subj: New Web address
Date: 00-03-05 15:49:57 EST
From: steve algdemoncouk (Steve Rawlings)
Thank you for including a link to my web site (on the LF Ham page).
Please note that my new address is as follows:
http://www.alg.demon.co.uk/radio/136/intro.htm
With best regards,
Steve Rawlings
GW4ALG
Subj: Galveston NDB, Picture
Date: 00-03-05 07:12:45 EST
From: DK8KW compuserve ('Geri' Kinzel, DK8KW)
Hello Lowfers,
as I wanted to see how our commercial collegues handle their antennas, I
used the opportunity during my US-trip to go to Galveston near Houston/TX.
Dave, ZL3FJ, had reported that this NDB beacon on 206 kHz has been heard in
New Zealand and Australia. Michael, the editor of "The European NDB
Handbook" gave me the exact location and with my handheld GPS system I was
able to find it easily.
I have put a short report and a photo I took onto my homepage
(http://www.qru.de/galveston.htm, or go to the main index page
http:/www.qru.de and follow the link).
Best 73
Geri, DK8KW (W1KW)
Subj: LowFER reception report from WI
Date: 3/2/00 1:35:49 AM Eastern Standard Time
From: d-lester execpc (dan)
Atmospheric noise is moderate tonight here in Seymour, WI (grid EN 54)
LowFER beacon "TH" was heard clearly for about an hour and a segment was
logged to a .wav file. The signal was far below the noise peaks but
still came through well. Using Spectrogram by R.S.Horne the frequency
was determined with reasonable accuracy to be 189.350 KHz. Time heard
23:25 CST 3-1-00. Receiver is a Drake R8b, CW mode, 500 Hz filter,
AGC-off. Antenna is 1200' insulated wire on the ground 270 degrees,
terminated at the west end with a 560 ohm resistor and 8' ground rod,
antenna is directly fed with coax, of which the shield is grounded to
another 8' rod at the feed point. No audio filter was needed to copy
"TH" through the noise.
73, Dan Lester, KE9SE
Subj: LW Broadcasting stations in Africa?
Date: 00-03-01 19:15:54 EST
From: olcosta gwmnet br (Orlando Costa)
Could someone please tell me if there is any Long Wave broadcast station currently operating in the Southern part of Africa?
Any list of LW broadcast stations will be welcome!
Orlando Costa
São Paulo, Brazil
Subj: Communication Bandwidth below 150 KHz
Date: 3/1/00 4:05:36 AM Eastern Standard Time
From: JuergenMehlhop InformatikUni-OldenburgDE (Juergen Mehlhop)
Sender: xray hooksiel.Informatik.Uni-Oldenburg.DE
Hello,
I'm writing my thesis about behaviour for an autonomous underwater
vehicle (AUV). As an introduction I wanted to state why AUVs are better than
remote operating vehicles (ROV). I assume that ROVs have a very limited range
because they're wired, or otherwise it might be technically difficult to
transmit all sensor data via radio or sound wave that is needed to control
the vehicle remotely. As far as I know, submarines use radio below 150 KHz
especially below 50 KHz for communication. I would like to know, how much
data per second could be transfered through water in this frequency spectrum.
For a ROV it would require to transmit several pictures per second from at
least one (often two) sonars (plus telemetry data) to a base station from
where the vehicle is controlled. I'd be happy if someone could name any
literature which I could give as a reference as well. Thanks in advance.
Sincerely,
Juergen Mehlhop
Klingenbergstr. 154
26133 Oldenburg
Germany
WWW: http://www.informatik.uni-oldenburg.de/~xray/
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