[amsat-bb] AO-40 K Band/W5LUA Followup

[Mike73@xxxxxxx]

Howdy,

I did some additional investigation into Al's successful AO-40 K band 
reception.

At 0715. AO-40 was 64,000 km from Al's QTH. The squint was 4.8 degrees. The 
squint reduced to 3.0 degrees at 0752 and the range increased slightly to 
64,800 km.

The fades Al experienced I'm sure are due to the fact AO-40 is spinning and 
that the K band antenna onboard is linear.

This is really good info for those of us looking to build up K band receive. 
With everything I've seen, my ultimate design goal is a 2 foot dish and 
system NF ~ 2dB. Pointing will be much more critical. I can see that I won't 
be mounting this system up on my tower with the rest of my satellite gear. I 
don't believe a G-5400 with cross booms will be stable enough. (for me 
anyway.....)

I have most of the parts/pieces figured out at this point. My goal is to work 
both terrestrial and satellite 24 GHz. It will necessitate the change of 
several components to do this. I'm looking forward to the K Band Breakfast at 
the Symposium this weekend!

73,
Mike, N1JEZ
AMSAT #29649
Local Area Coordinator
"A closed mouth gathers no feet."
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