[Moon] OFFSET DISH MON NOISE
Edward R Cole
kl7uw at acsalaska.net
Sun Oct 26 00:19:16 CEST 2014
Serge,
I checked a 1.2m dish with optimum feed and 0.8 dBNF LNA*. Moon
noise today would be 0.4 dB over cold sky. Beamwidth = 1.69 degree,
gain = 40.31 dB. I used VK3UM EME Calc for this. Sun noise/cs =
9.15 dB (2695-MHz SFU=219 is very high today). VK3UM Calc does not
have feeds for offset fed dishes so I substituted f/d = 0.53 and N2UO feed.
0.4 dB moon noise would be just detectable if you use the 0.2 dB/DIV
scale on Spectravue.
For comparison my 4.9m dish with W2IMU feed on 1296-MHz shows 0.18 dB
Moon noise/cs on VK3UM EME Calc, and 18.47 dB sun noise/cs
73, Ed - KL7UW
*0.8 dBNF is typical eme standard on 10-GHz.
At 01:27 PM 10/25/2014, serge wrote:
>Using Spectravue what would be the moon noise detectable for a 1M or
>120cm offset dish on 10368ghz?? I tried to look at VK3UM program &
>that would generate more questions.
>Thank you
>Serge VE1KG
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>Moon at moonbounce.info
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73, Ed - KL7UW
http://www.kl7uw.com
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