[time-nuts] Loran?

Magnus Danielson magnus at rubidium.dyndns.org
Sun Dec 19 03:30:10 EST 2010


On 12/19/2010 05:44 AM, Chris Albertson wrote:
> This is a marine navigation unit sold under "West Marine's" own brand
> name.    It looks modern and automated.  Has functions on it like
> "anchor drift alarm"  Where you fix your location then set a radius
> and if the unit moves outside the radius it beeps loudly.  Just what
> you'd want if your ship of dragging anchor.  The unit is very small
> and modern looking.  It is controlled with a keypad and large LCD
> screen.  Zero analog knobs.
>
> My guess is that this thing wants an active whip antenna of some kind.
>   There is an BNC on the back.

For longer distances I think a H-field antenna is preferred. It would 
probably not be too hard to cook one up that would be suitable. The DC 
bias of the BNC would be good to know in that case.

> I don't think this is worth a lot of time, not if the transmitters are
> gone.   I thought I read they were going to continue for another 20
> years.

Again, this all depends on where on this earth you are. We don't need 
bomb-coordinates to help you...

Cheers,
Magnus




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