----- Original Message ----- From: "Bob- W7LRD" <w7...@comcast.net> To: <ao51-mo...@amsat.org>; <ao51-mo...@amsat.org> Cc: <amsat-bb@amsat.org> Sent: Sunday, October 04, 2009 8:03 PM Subject: [amsat-bb] AO-51 L/S?
> Hello Gents < snip> 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 _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
