ON7AMI Amateur Radio, Meteology and Astronomy website. JO10UX |
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On the left one can see that the signal. The strength is fluctuating between -12dBm and -16dBm. On the right you can see in the upper level the signal level 1dBm (taken in account here the 14 dB attenuation) in the middle you can see the noise flour of -24dBm and the third value is difference. So we have a nice 25dB over the noice flour what result in an B5++ image. Calculating back, assuming 0dBm on the splitter we have on the exit of the LNB 3dBm. A MF gain of the LNB of 50 dB and an antenna gain of 30 db gives us -77 dBm signal in the air. So the calculated signal of -77.2 dBm seems to be correct what we messure. |
سُوۡرَةُ حٰمٓ السجدة / فُصّلَت
Surah Fussilat: Thereafter turned He to the heaven and it was as smoke, and said Unto it and Unto the earth: come ye twain, willingly or loth. They said: we come willingly. (11) Then He decreed them as seven heavens in two days, and revealed Unto each heaven the command thereof; and We bedecked the nether heaven with lamps and placed therein a guard. That is the ordinance of the Mighty, the Knower. (12) De hemelen en aarde (waren) een samenhangende massa. Wij hebben ze toen van elkaar gescheiden… Wij hebben de hemel tot een beschermend dak gemaakt … en de dag en de nacht, de zon en de maan geschapen. (Koran 41 11:12)
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