> Hmm... Let's calculate it... http://www.nrl.navy.mil/content.php?P=MOONRELAY > He states in the article that he is using a WAP11 at his house > running at 100mW (too bad as a WAP11 splatters all up and down the > band in this mode and he is likely violating the FCC's spectrum > requirements) into a 21dBi dish. The mountain top is 1.5 miles > away. He is using some sort of yagis on the mountain top. The > second path is 5 miles. He doesn't state the gain of the yagis or > what the antenna is at the ISP. But we can make some assumptions... > > Ignoring cable/connector losses at his home he is doing 41dBm EIRP > out of his antenna (20dBm + 21dBi). The free space loss at 1.5 > miles is about 108 dB. Lets assume his yagis are 18dBi and there > is no loss on the cable connecting them together. The 5 mile path > will have a free space loss about 118dB and we will assume he has > a 24dBi gain antenna on the roof of the ISP. Lets add this up... > > 41 dBm EIRP (20dBm + 21dBi) at his house. > - 108 dB Free space loss - first link > + 18 dBi antenna gain on the mountain. > + 18 dBi antenna gain on the mountain. > - 118 dB Free space loss - second link. > + 24 dBi antenna gain at ISP. > ========= > - 125 dBm
According to these calculate communication through the moon is impossible ... Really communication is, even if to use 10W -Ivan -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
