[Lowfer] strange VLF transmission

[Douglas D. Williams]

Hey Garry and Todd. Yes, the center frequency wasn't precisely at 18 kHz. I
was looking at 0-48 kHz on the screen, so it probably was 17.8 kHz. Guess
that was the first time I've ever seen a Tacamo transmission.

Also, the 20 seconds was not precise either, but it was definitely a short
burst that only lasted a few seconds.

Thanks,
Doug

On Wed, Feb 15, 2012 at 10:10 AM, <ToddRoberts2001 at aol.com> wrote:

> Hi Garry and Doug,
> I have wondered about the significance of 17.8KHz for Tacamo and
> read that 17.8KHz was the original frequency for NAA which has since
> moved to 24.0KHz. I understand that 17.8KHz is reserved now for
> different locations in the U.S. meaning portable or mobile  operations.
> I have also read that TACAMO has been observed sending
> transmissions as short as 20 seconds in the past.
> 73 - Todd WD4NGG
>
>
>
> In a message dated 2/15/2012 8:42:05 A.M. Eastern Standard Time,
> k3siw at sbcglobal.net writes:
>
> Doug, I wonder how precise the center frequency of 18 kHz was? 17.8 kHz
> is a frequency where I've often heard wideband TACAMO transmissions.
> They often (always?) begin with a burst of 50 baud RTTY, then send wide
> and very wide signals with short off-time gaps in-between. I don't
> recall those transmissions being as short as 20 seconds but I suppose
> they could be.
>
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