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\nBun
\nHere are a couple of pictures and info on my system
\nThe 47 GHz EME station at W5LUA consists of a 2.4M offset
\nfed dish with a dual mode W2IMU feed. Receive noise figure
\nis approximately 4.75 dB noise figure. The converter uses dual
\nconversion for good image rejection. The first IF is 8.01 GHz
\nwhile the second IF is 144 MHz which is fed to an FT-847.
\nI use K5GW moon tracking software which also controls the receive
\nfrequency to keep the Doppler shifted frequency in the receive
\npassband. LOs are GPS locked. A similar upconversion scheme is
\nused on transmit. The driver at 47 GHz is an Agilent Technologies
\nAMMC-5040 which provides the drive for a surplus Hughes traveling
\nwave tube that provides 30 watts at 47 GHz. All equipment except
\nfor the 2M IF is located at the feed of the dish. US Digital
\nencoders are used to keep the dish within .05 degrees of being
\naimed at the center of the moon. This is especially important at
\n47 GHz since the 3dB beamwidth of the dish is only 0.2 degrees
\nand the first sidelobes are at the edge of the moon. My best
\nsun noise measures 7.2 dB while the best moon noise measured is 0.6dB.
\nAl Ward
\nW5LUA
\nMay 4, 2005<\/p>\n","protected":false},"excerpt":{"rendered":"