----- Original Message ----- From: "Bob- W7LRD" w7lrd@comcast.net To: ao51-modes@amsat.org; ao51-modes@amsat.org Cc: amsat-bb@amsat.org Sent: Sunday, October 04, 2009 8:03 PM Subject: [amsat-bb] AO-51 L/S?
Hello Gents
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The only way I have for "tweeking" my S band gear is to put a -35Dbm signal source at the end of my driveway and tweeking my equipment and antennas. Real world evaluation is always the proof of success.
73 Bob W7LRD
Hi Bob W7LRD
Instead to use a -35 dBm signal source why you don't try to receive the Sun-Noise ? Using my 4 feet parabolic dish and an overall Noise Temperature of 75 kelvin (1 dB NF) of my receiving system with 50 kelving from the cold sky yesterday I got 3,5 dB of Sun-Noise with the actual 72 sfu (Solar Flux Units ) which is a very low value of Sun activity.at 2800 MHz 10.7 cm Using the program NOISE.EXE this metod allow you to compute if the Sun-Noise level that you receive is in agreement or not with the receiving parameters of your receiving system i.e. it is a small radioastronomy exercise and a more accurate method than using a Signal-Source. In a separate email I have sent to you the progam NOISE.EXE The site where to get daily the Radio Flux in sfu at 2800 MHz 10.7 cm as requested by NOISE.EXE is:
http://www.swpc.noaa.gov/ftpdir/indices/DSD.txt
73" de
i8CVS Domenico