The world below 535 kHz
Due to lack of time this page is no longer maintained actively and
it may contain obsolete links.
- Longwave aero Non Directional
Beacons in Greece.
- Longwave directional beacons in
Longwave Club of America (LWCA) homepage.
- A few links related to VLF signals caused by natural phenomena,
especially lightning. Based on information posted in the WUN mailing
list and the Sep. 1996 issue of WUN newsletter.
- A few links related to the swedish Grimeton Radio - SAQ
Alexanderson Alternator electromechanical transmitter.
- The swedish
Radio Station Grimeton - SAQ, which still transmits
occasionally for the benefit of radio amateurs and listeners.
- Annual SAQ events are organized every July by the
- A spectrogram
of the July 1, 2001 transmission by Alex Deligiannis, SV8QG.
- An electromechanical
CW VLF receiver by Jim Moritz, M0BMU,
This direct conversion CW receiver does not use any thermionic valve/tube or
semiconductor components, was designed for the 2001 annual SAQ special transmission
and was also capable of receiving CW signals from Indian Naval transmitter
- Background information about
Canadian Lowfer activity
by Joe Cooper, VE3FMQ,
firstname.lastname@example.org. At the
same site read the
to LF and VLF radio monitoring, An article from Popular Communications
Magazine Vol. 16, No.3, November 1997.
- LF/VLF Standard Frequency and Time Signals
- The Weather Radio Page
by William R. Hepburn, email@example.com.
This site contains info about the
NAVTEX and CW wx
transmissions between 410 and 530 kHz and
Broadcasts on longwave NDB's and locators. There is also
a page with information about VLF/LF/HF Time Signal and Volmet transmissions.
- Starlink's list of
Longwave DGPS Beacons (250-350 kHz). Starlink has more GPS related
pages and links to related FAQ documents.
- The US Coast Guard NAVCEN - maritime
navigation public access reference pages with info about DGPS beacons, LORAN-C etc.
Unfortunately most on-line pictures have been removed and access to many
pages with descripiton of bases etc are now blocked for many users as they remain
in the old ".uscg.mil" top level domain.
- Information on the
Northwest European LORAN-C system (NELS).
- International LORAN Association.
- Aero and Maritime NDB related pages:
- "What do navaids look like":
Longwave Beacon info and pictures by Dale Dickerhoof,
Longwave Page by Alex Wiecek,
firstname.lastname@example.org. The site contains a list
of longwave transmitters in Canada and a fantastic
- Robert Connolly's, GI7IVX, list of
European Aero and Maritime NDBs info page. Robert
is the compiler of the "Non Directional Beacons
of Europe" list.
- The AIRNAV pages contain a database
of Non Directional Beacons
in the U.S.A by Paulo Santos,
- List of
South American NDBs by Marcus Ramos, PY3CRX/PY2PLL,
- Canadian NDB list
by Pierre Thomson, KA2QPG,
email@example.com. Also visit Pierre's
- The Northern Beacon:
a collection of Long-and Medium Frequency Beacons monitored in Norway,
by Kjell Arne Olsen and Svenn Martinsen,
in onda lunga in Italia e paesi limitrofi: Longwave radio beacons in Italy and
neigboring countries by firstname.lastname@example.org.
- A page with photos and technical info about the
maritime beacon RD on 299 kHz, by Alessandro Kosoveu, IW3SGT.
- Jill Dybka's
Longwave and Beacons web pages.
- NDB logs by
DX info by Robert Kramer, NV8V,
email@example.com, including NDB
Impact of Navigation Aid Systems on Air Force Real Property
Requirements: a historical paper by Scott D. Murdock.
From a report submitted to Embry-Riddle Aeronautical University
- A page with nice photos of the
Lord Howe Island NDB
in the Pacific Ocean. The beacon id is LHI and its frequency is 272
Radio Navigation in 1918 (Popular Science Monthly, April, 1918, pages
- A collection of
material by Klaus Betke, DL4BBL,
firstname.lastname@example.org. The site
contains frequency lists (NAVTEX, Time stations), projects and
captured audio files.
- Cor van
maintains a log of longwave beacons received in Netherland and a list
of 518 kHz NAVTEX transmissions.
- LF amateur band
info by Mike Dennison, G3XDV,
of transatlantic propagartion of Canadian military station Halifax
Radio - CFH on 137.0 kHz.
- 136 kHz propagation forecasts
and other related stuff by Alan Melia, G3NYK,
There is also a history of Rugby Radio station.
G3YMC 136 MHz page with equipment description, by Dave Sergeant,
- Web site of G3YXM.
A very good site with lots of data and recent LF news, mosty about
the 136 kHz amateur radio LF band.
- European amateur radio
73 kHz and 136 kHz skeds by Chris Trayner, G4OKW.
- K0LR longwave site by
Lyle Koehler, K0LR, email@example.com.
Lyle also operates lowfer beacon LEK on 186.7 kHz at Atkin, Minnesota.
Read the excellent article
Computer modeling of LowFER transmitting antennas at this Lyle's site.
136 kHz pages by Steve Rawlings, GW4ALG.
Interesting description of a home-made, remotely operated
10 MHz to 136 kHz transverter for Yaesu FT-707 and ICOM IC-756Pro.
- U.S. Navy VLF/ELF Submarine Communications: The Federation
of American Scientists (FAS) web site contains information about the
U.S. Navy ELF program,
U.S. Navy VLF program,
The HAARP project
also maintains a page about the
You can also read an interesting US Navy "Fact File" about the
"Extremely Low Frequency Transmitter Site Clam Lake, Wisconsin" in PDF format.
Reception reports can be sent to:
IIT Research Institute
P.O. Box 56
Clam Lake, WI 54517
or by e-mail to: firstname.lastname@example.org.
of ELF signals at antipodal distances: A paper by A.C. Fraser-Smith
and P.R. Bannister discussing the Russian ZEVS ELF system.
(Acrobat PDF file, Source: Trond Jacobsen, July 2001)
- A conspiracy theory about a hidden
at Berlin/Tempelhof by Grazyna Fosar & Franz Bludorf,
Zeland LF scene: The web site of the ZL Low Frequency Interest
Group, by Murray ZL1BPU,
- Web site of Noumenon, Inc. with
Eric Vogel's VLF projects.
- Low Frequency and Below
experimentation pages, by Steve Olney, VK2ZTO,
site is also mirrored at QSL.NET.
- AMRAD Low Frequency
Web Page with info about many AMRAD projects, including the WA2TFX/12
beacon and the associated "earth bipole" antenna.
- Another good LowFer site,
Altair's Lowfer Page,
owner of YWK beacon on 184.32 kHz.
( Source: Paul, W0RW, 20 January 2000)
- A photo gallery of the
7S6SAJ Special Event Operation on 136 kHz in February 2000, by Jan,
- The web site of
Mitch, VE3OT, active on 135.7 - 137.8 kHz, with photos of his G0MRF
300W transmitter and a spectrogram of a VA3LK CW transmission.
DGPS beacons in Europe. The page contains a map of all the DGPS
beacons in Europe, with full details of their locations, frequencies,
bit rates etc. (Source: Alan Gale, 23 April 2000)
- Utility Monitoring Central by
Mike Chace-Ortiz, email@example.com.
UMC is dedicated to non-broadcast digital communications from
VLF to SHF.
- Web site of Low
Frequency Experimental Beacon XMGR transmitting on 186.404 kHz
from Helena, Alabama, USA, by Les Rayburn, N1LF,
Information about beacon 1LF on 187.3 kHz is also available at this
site, as well as a list of all known lowfer beacons in USA and Canada.
- Experimenter's Corner
by Bill Cantrell, WD5CVG,
firstname.lastname@example.org, operator of
TEXAS lowfer beacon on 189.7 kHz.
- Recordings of Halifax Naval,CFH
signals by Bill de Carle email@example.com,
using NIAGARA DSP program. Other DPS programs are also available at this
- Commercial site of LF Engineering Co.,
Manufacturers of Low Frequency Equipment for LF Communications, Natural Radio Research,
AM Broadcast and Shortwave Radio.
- Web site of OK1FIG from
the Czech Republic, with a photogallery from the September 2000 DX-pedition to square
- LF Amateur radio
site by Holger 'Geri', DK8KW (W1KW), firstname.lastname@example.org.
Geri's site contains info about amateur radio experiments on 8975 Hz (approx. 9 kHz)
and an extensive list of LF links.
shielded magnetic-loop antenna, designed by P. Schnoor, DF3LP,
email@example.com for LF use.
- A site with
Soundcard DPS radio related software
to download, by SWL Ko, NL9222.
- Full report with pictures from the
Guernsey - GU
LF DX-pedition by Dave G3YXM,
- A review of Hyperbolic
Radionavigation Systems by Jerry Proc, VE3FAB,
firstname.lastname@example.org. Contains information
about Decca, Loran, Omega and related systems.
- U.S. Navy VLF station
NSS - Annapolis: A tour
of the station facilities and the AN/FRT-87 1 MW transmitter in 1998 by
Jim Hawkins, WA2WHV. (Thanks to Peter Schmalkoke for the update). Historical
and technical background of
NSS Annapolis, Maryland
also by Merle Parten, K6DC,
- Investigation of the
signal stength of Hellenic
Navy LF station Marathon at G3NYK QTH (JO02PB), a 2344 km path, By Alan
Gyrator tuned VLF receiver by Arthur J. Stokes, N8BN,
the American Association of Variable Star Observers.
of VLF/LF frequencies by John Kielkopf, last updated in May 1999.
Introduction to LF and VLF radio monitoring, by Joseph Cooper,
VE3FMQ, (from Popular Communications, November 1997).
- The LF RDF project,
a page where you can upload the resuls of your DF efforts in the LF band (0 - 150 kHz)
and compare it with the results of other investigators.
- Polish LF amateur radio scene, by
Marcin, SQ2BXI, email@example.com.
- The WUN
ELF and VLF guide, version 1.0 by Trond Jacobsen,
RTF (rich text format).
An HTML version of the guide
is also available at The Open Lab site.
- LW Broadcasters
Dead or broken Web Links
The following links to LF resources do not respond. Please let me know if any
of these sites are relocated to a new ISP or if the information resides under a
Sounds from Umea University, Sweden.
- ARRL VLF Bibliography at
- A homemade lowfer transmitter
built by Fred Davidson,
- A paper by Don Moman about
Selective Voltmeters and their Uses in the Radio Hobby.
- Complete list of LORAN-C
stations worldwide, with coverage maps for each chain.
Links and sites not yet visited
Last updated 7 December 2003
Maintained by firstname.lastname@example.org