----- Original Message ----- From: tosca005@umn.edu To: "i8cvs" domenico.i8cvs@tin.it Cc: "Nigel Gunn G8IFF/W8IFF" nigel@ngunn.net; "AMSAT-BB" amsat-bb@amsat.org; "Fabio A" iw8qku@amsat.org Sent: Thursday, April 22, 2010 12:04 AM Subject: Re: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
Domenico: I suspect that the difference of opinion has to do with the difference in punctuation (',' vs. '.') used with large numbers.
In typical American usage, 243,902,443 Million Watts = 243,902,443,000,000 watts = 243.9 trillion watts 243.902 443 million watts = 243,902,443 watts = 243.9 million watts
without the punctuation ->
243 902 443 million watts = 243 902 443 000 000 watts = almost 244 trillion watts.
So, I think that if the comma is used as a 3-decade separator and not a decimal point, that the original posting was in fact a million times overstated. I hope that clarifies it.
If not, then think of it this way.
400 watts x 0 dB = 400 watts 400 watts x 10 dB = 4000 watts = 4 kilowatts 400 watts x 20 dB = 40000 watts = 40 kilowatts 400 watts x 30 dB = 400000 watts = 400 kilowatts 400 watts x 40 dB = 4000000 watts = 4000 kilowatts = 4 megawatts 400 watts x 50 dB = 40000000 watts = 40000 kilowatts = 40 megawatts 400 watts x 60 dB = 400000000 watts = 400000 kilowatts = 400 megawatts
They were nowhere close to 400 000 000 (400 million) megawatts of ERP.
400,000,000 million = 400 million million = 400 terawatts 400.000.000 million = 400 million = 400 megawatts
73 de W0JT
Hi , W0JT
I agree with you that the difference of opinion has to do with the difference in punctuation (',' vs. '.') used respectively in typical American and European usage with large numbers so that
400,000,000 million = 400 million million = 400 terawatt in American usage 400.000.000 million = 400 million = 400 megawatt in European usage like in Germany France and Italy
Tanks and
73" de
i8CVS Domenico