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Re: Orbit 250 apogee



It's great to see so much new interest in Amateur Microwave equipment and
techniques. For good info on this subject check out Paul Wade's N1BWT
website and particular http://www.qsl.net/n1bwt/chap5.pdf  for offset
parabolic antenna info.
 - Kerry N6IZW -

At 09:21 PM 5/18/01 +0200, Jens H. Jensen wrote:
>At 03:04 18-05-2001, you wrote:
>
>--snip--
>>Amateurs have published designs for 0.4 dB NF (28 K) amplifiers in QEX and
>>Microwave Update and antennas can easily be made with sidelobes that are 15
>>db down so that they only pick up 9 K of ground noise.
>
>Does this mean that using an offset-dish instead of a primefocus dish is 
>actually an advantage, since the feed is usually NOT pointed at the ground, 
>but upwards, so that over-illumination will not "see" the ground?
>
>How big is the ground-noise contribution exactly?
>
>Is there anywhere I can read more about it?
>
>73 de OZ1LRG
>
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