Wow, If I read that correctly the charts are showing almost 20 dB or more higher noisefloor measurements on VHF than UHF. That is a huge difference. But in the text they say it is "30 dB" higher. I haven’t had time to dig out why the say that, but at a first cut, this shows the 9 dB link advantage of VHF over UHF vanishes at the ground station trying to hear a weak signal in the noise...
I did not have time to thouroughly digest the report. SO may have jumped to the wrong conclusion based on the details.
Bob, WB4aPR
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of M5AKA Sent: Wednesday, June 17, 2015 1:23 PM To: AMSAT BB Subject: Re: [amsat-bb] EO-80 FM Transponder Tested (noise floor?)
Results of Ambient RF Environment and Noise Floor Measurements Taken in the U.S. in 2004 and 2005 https://www.wmo.int/pages/prog/www/TEM/SG-RFC06/Ambient-RF-noise.pdf
73 Trevor M5AKA
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