[Milsurplus] VLF Reception

[jmfranke]

The signal is MSK (minimum shift keying) with four interwoven encrypted 
signals.  MSK is easily demodulated, but what is left is encrypted.

John  WA4WDL

--------------------------------------------------
From: "B. Smith" <smithab11 at comcast.net>
Sent: Wednesday, January 06, 2010 10:53 AM
To: "Milsurplus" <milsurplus at mailman.qth.net>
Subject: [Milsurplus] VLF Reception

> Speaking of VLF transmitters, have any of you digital experts been able to
> decipher any of NAA's transmission on 24.0 kcs. I use the station on a
> regular basis as a "system" check of my low frequency loop antenna. NAA 
> Puts
> out a heck of a signal here on the east coast- - with my 7 foot  loop
> aligned with  the station the reception exceeds 400 uV !
> 73
> breck k4che
>
>
>
>
> In 1956 the VLF transmitter on 25.8 KHz at Marion MA
> | was sending make and break RTTY at 60 wpm.  I first
> | copied it at Andrews AFB, then at various places in Alaska.
> | The antenna was a multi-turn square loop about a meter on
> | a side.  Just set it on the ground, or snow, with the loop in
> | the plane of the incoming signal.  The loop was built by Hinge,
> | a Canadian company.   It was, I suppose, the best for the
> | north country, and smaller than a Beverage for that frequency.
> | 73  Clete
> |
> |
> |
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