1984: Starlink First Partner: Local Cops and State Military
schear.steve at gmail.com
Thu Oct 1 16:18:55 PDT 2020
There is at least one other antenna technology useful for aiming RF
transmissions: NFDAM (Near Field Direct Antenna Modulation). Typically, a
continuous carrier is sent to the antenna and there a digital signal is
used to select an element from a 1 or 2 dimensional feed array that
modulates the far field direction of the signal with the intended data.
When properly applied only the signal in the desired direction (to the
intended receiver) can be reconstructed (or even detected).
On Thu, Oct 1, 2020 at 6:55 PM jim bell <jdb10987 at yahoo.com> wrote:
> Yes. Weeks ago, I concluded that Starlink was probably using a
> "phased-array" IC for the ground station, so that the beam could be
> electronically steered. (The same IC that is being used for the Walabot
> sophisticated 'stud-finder'.
> This is important, because they don't want the outputs of millions of such
> devices to be simultaneously emitted in ALL directions. THAT is a major
> advance, and it makes what they are trying to do practical.
> Jim Bell
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