Using microwave communications dish for Ku? (1 Viewer)

Inno

Thread Starter
SatelliteGuys Pro
Aug 13, 2006
1,596
5
NW Ontario, Canada
I have obtained (through legitimate means) an approximately 3.5' Andrew microwave antenna which used to reside on a tower to provide point to point communications for a remote community. It still has the feedhorn in tact although it used a waveguide to feed the signal from the equipment in the office to the antenna. I presume I already know the answer to this, but thought it best to ask anyway...Would the focal distance be the same for any LNB I place on it as the original feed? I figure it should be so that makes my work a little easier when it comes to fabricating a mount for the LNB.
 

comfortably_numb

Dogs have owners, cats have staff
Pub Member / Supporter
Nov 30, 2011
10,720
11,350
Missouri/Kansas
Like this?

download.jpeg
 
  • Like
Reactions: olliec420

Inno

Thread Starter
SatelliteGuys Pro
Aug 13, 2006
1,596
5
NW Ontario, Canada
Not quite like that, but similar. I believe this one had a "radome" on it prior to being disassembled. I will post some pictures when I get to it. Just had some time to kill at work and figured I'd pose the question. It's getting to that time of year when I think about thinking about moving indoors and what needs to be done before that happens.
 

johnnynobody

SatelliteGuys Master
Pub Member / Supporter
Aug 2, 2009
5,246
914
42N 103W
Last time I checked, that antenna does not have a downconverter in the feedhorn like an LNBF and requires either rectangular or elliptical waveguide to bring the signal into the building. That feedhorn you see in that photo is a rectangular feedhorn that is built for a specific frequency range and may have a tunable section or what is called "dent tuned". I suppose you could modify the feed system so that you could mount a feed support (buttonhook or struts) to accomodate a LNBF. Also, when you remove the existing feed system, you'll need to put a center plate over the hole in the center of the dish.
 

johnnynobody

SatelliteGuys Master
Pub Member / Supporter
Aug 2, 2009
5,246
914
42N 103W
Looks like that antenna may have been used for 18 GHz. But I'm guessing by the way the feed looks. Anyway, if you fabricate a support it should work for Ku. f/d and focal length can be calculated if you don't have the antenna specs.
 

Users who are viewing this thread

Users Who Are Viewing This Thread (Total: 0, Members: 0, Guests: 0)

Latest posts

Top