[TowerTalk] Off topic quesiton

[Steve Lott]

How is this relevant to the Email Reflector

Tower Talk. ????

Steve
KG5VK

On Mon, Jan 21, 2019 at 12:45 PM jimlux <jimlux at earthlink.net> wrote:

> On 1/21/19 9:57 AM, k7lxc--- via TowerTalk wrote:
> > Howdy, TowerTalkians --
> >      The recent Chinese moon landing on the dark side has me wondering
> how they communicate from back there. Since we're talking line of sight
> frequencies with no atmospheric scattering or repeater relay capabilities,
> what's going on? Inquiring minds want to know. Tnx!
>
> Relay satellite in a halo orbit at L2. L2 is on the far side of the
> Moon, about 450 million km from Earth (the Moon is around 385 million km
> from Earth)
>
>
> https://en.wikipedia.org/wiki/Halo_orbit
>
> Although we talk about it as a round circular orbit in a plane, in
> reality the orbit is more like the edge of a Pringles potato chip.  It's
> not planar. There's a whole family of stable orbits that look like 3D
> lissajous figures.
>
> For what it's worth, there's also Moon libration, and some tall
> mountains near the Lunar south pole.. if you land there, you're
> technically on the far side, but the mountain is high enough to see over
> the edge, helped a bit by diffraction.  There's also schemes to use
> diffraction from within Aitken Basin for comm without a relay (perhaps
> in an emergency, if your relay satellite dies)
>
>
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-- 
​*Steven Lott Smith - Your Candidate for NTX Section manager*
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