Moderators: Dave Moll, Steve Anderson
bellringerSteve Anderson wrote:Communications with submerged submarines depends on VLF, on diving the antenna is extended out of the stern of the vessel and two-way communication can be performed. It's (these days) of a binary nature and with the bandwidth available of quite slow speeds. But it's better than nothing.
I recall seeing a UK band-plan document a few years back (try the RSGB) where below 9kHz was 'unallocated'. Above 9kHz was mainly 'Marine', "Frequency Standards' (MSF in the UK on 60kHz) and atmospheric propagation studies (SIDs and the like...a fascinating field of study that amateurs are large contributors to).
Harry, in your own back-yard...13.000kHz, Royal Australian Navy, Gippsland, Ex-Omega Navigation, listed as active,
Here I get a strong signal (during the day) from VTX3, 18.2kHz, Katabomman, South Vijayanarayanam, India. Uses high-speed Morse, very useful for SID monitoring...
But here's one I cannot confirm...
00000.082kHz:Russian Navy ELF communication facility, Kola Peninsula, RUSSIA:MSK
ACTIVE
Transmission format: 82 Hz N0N and (multichannel?) MSK. Prior to message is a presumed "bellringer" or message-follows signal: 0.4 Hz shift down to 81.6 Hz for 8 minutes, then up to 82.7 Hz for 4 minutes. This initial signal sequence is directly followed by a downshift to 81 Hz for 38 seconds and a up-shift to 83.3 Hz for 22 seconds. After this comes the message, using these shifts, for a total of 16 minutes. A complete message sequence lasts for 29 minutes.
"Zevs" is reported to have an operational frequency range of 00000.031 to 00000.166 kHz. This Russian ELF transmitter is nicknamed �ZEVS�.
Steve A.
P.S. SID = Sudden Ionospheric Disturbance.
Dave Moll wrote:Wouldn't these transmissions be similar to the emanations from an Audio Frequency Induction Loop System (hearing loop) where a hearing aid (or other suitable transducer) is needed to convert the electromagnetic waves into audible sound?
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