[time-nuts] WWVB and Free Democracies Survival

[Tom Miller]

Hi Didier,

Yes, you are correct. My memory from 10 + years ago is slowly fading. The 
ELF transmitters were used to get the subs up to near surface so they could 
receive messages from the VLF sites. NSS was a VLF site.

Thanks for the reality check :)

Tom

----- Original Message ----- 
From: "Didier Juges" <shalimr9 at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, July 16, 2012 3:59 PM
Subject: Re: [time-nuts] WWVB and Free Democracies Survival


I  believe ELF is more like 100 Hz, which can be received much deeper,  so 
the sub can stay at the bottom.  24kHz is VLF.

Didier KO4BB



Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

>On 07/16/2012 03:28 AM, Tom Miller wrote:
>> I believe they called that system a "bell ringer". It let the sub
>know
>> that it had to come close to the surface to receive new information.
>> I'll need to google around to find more about it.
>>
>> We had a ELF transmitter (NSS) in Annapolis that transmitted about 1
>MW
>> at about 24 kHz. Anyone ever seen 3 inch diameter litz wire?
>
>We had the ELF transmitter at Grimeton (SAQ) transmitting about 200 kHz
>
>at 17.2 kHz using the Alexanderson alternator. I think the litz wire
>was
>4 inch in diameter as I recall it. It was cutting edge in 1924.
>It was initially used for telegraph traffic to the US, and the Long
>Island main station. It was really never keyed by hand, it was keyed
>remote with optical keyer and messages taped back-to-back. After its
>main service for telegraph messages was no longer motivate it, it got
>used as the "bell ringer" for our subs and kept operational and
>maintained up till about 1996 and it has since been taken care off so
>it
>can be used for museeum. It's now on UNESCOs world-heritage list.
>
>Links:
>http://www.grimetonradio.se/
>http://www.radiostationengrimeton.se/
>http://en.wikipedia.org/wiki/Grimeton_VLF_transmitter
>http://www.grimeton.org/
>http://www.alexander.n.se/
>
>Do visit Grimeton if you are in south of Sweden. You can also tune in
>to
>it's transmissions and report back.
>
>The remaining submarine radiostation in Ruda could actually be turn
>into
>a time-code transmitter. It's a matter of financing it and giving the
>order.
>
>Cheers,
>Magnus
>
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