77.5 GHz EME

もう、光通信だね。
—– Forwarded Message —–
From: “Sergei RW3BP”
To: moon-net@nlsa.com
Cc: “Barry Malowanchuk” , “Al Ward”
Sent: Wednesday, February 20, 2013 1:05:38 AM
Subject: 77.5 GHz EME

Last weekend (February 17) I tried my first echo test on 77.5 GHz. The weather was good for the test. No clouds, temperature -7C, humidity 85%.
Transmitted signal was simple “E” – 25% on and 75% off with 0.7s period. Three periods to transmitt and five periods pause to switch TX/RX and to receive. Echo signal was -20…-22 dB under noise in ref to 3 kHz BW. To detect echo signal I used my MWCW program. The signal was well seen after 1 min averaging. Test was at elevatings from 30 to 50 deg. Moon noise was about 0.4 dB.
Antenna is 2.4m alu offset dish. Output power of TWTA is about 60W. Noise Figer of RX is about 6dB.

73
Sergei
RW3BP
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