Towertalk
[Top] [All Lists]

Re: [TowerTalk] Off topic quesiton

To: jimlux <jimlux@earthlink.net>
Subject: Re: [TowerTalk] Off topic quesiton
From: Steve Lott <lottsphoto@gmail.com>
Date: Mon, 21 Jan 2019 12:47:30 -0600
List-post: <mailto:towertalk@contesting.com>
How is this relevant to the Email Reflector

Tower Talk. ????

Steve
KG5VK

On Mon, Jan 21, 2019 at 12:45 PM jimlux <jimlux@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)
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
-- 
​*Steven Lott Smith - Your Candidate for NTX Section manager*
*I will bring more Information & Education to my fellow North Texas ARRL
Members*
*"Education - the way for ​our​ Section with active amateurs to have More
fun and Enjoy our great hobby"*
http://sdxa.blogspot.com/
​KG5VK Blog​
http://www.KG5VK.com
My Ham Radio Friends
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
<Prev in Thread] Current Thread [Next in Thread>