Scope in a box observing results

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Marcus D. Leech

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Mar 30, 2026, 1:57:33 PM (3 days ago) Mar 30
to Society of Amateur Radio Astronomers
Does anyone have a set of spectral observations with the "as shipped"
scope-in-a-box setup, for some of the "usual suspects"?  Cygnus A, Tau
A, etc?

I mentioned it last night when I was a guest on a live-stream:

https://www.youtube.com/watch?v=6DWwPrFETzc&t=7566s

There is some interest in reproducing our results, but at an amateur
scale (totally doable).  I suggested the scope-in-a-box, but the
"discovery" family is also
  a possibility.


Alex P

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Mar 30, 2026, 2:22:01 PM (3 days ago) Mar 30
to Society of Amateur Radio Astronomers
The New Nooelec with the 1.4G H1 Feed ?

Exec Summary : there are design issues = get the Kraken System

Both eval'd Dec 25
SBox_vs_Kraken.jpg

Alex Pettit




b alex pettit jr

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Mar 30, 2026, 2:34:11 PM (3 days ago) Mar 30
to 'Alex P' via Society of Amateur Radio Astronomers
The Nooelec design forces the LNA to be spaced from the (marginally designed ) Dipole by coax AND
the Location of the Feed is too far from phase center:  see difference below

Inline image

Marcus D. Leech

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Mar 30, 2026, 2:46:39 PM (3 days ago) Mar 30
to sara...@googlegroups.com
Thanks, Alex.

This is consistent with my tests of an early prototype grid-dish and feed system that NooElec sent me a couple of years ago. 

Grid-dishes in general are a bit of a compromise already, and then when you don't have the right feed architecture, it's a bit of a double
  compromise.






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