[amsat-bb] Re: OT - Weather sats

[Artur]

Hello ED and al


> Any idea on what kind of TX power is being used for the weather satellites?
>

In case of  NOAA POES - APT trasmision:

" ...The signal itself is a 256-level amplitude
modulated<http://en.wikipedia.org/wiki/Amplitude_modulated>2400
Hz <http://en.wikipedia.org/wiki/Hz>
subcarrier<http://en.wikipedia.org/wiki/Subcarrier>,
which is then frequency
modulated<http://en.wikipedia.org/wiki/Frequency_modulated>onto the
137MHz-band RF
carrier <http://en.wikipedia.org/wiki/Carrier_wave>. Maximum subcarrier
modulation is 87% (±5%), and overall RF bandwidth is 34KHz. On NOAA POES
vehicles, the signal is broadcast at approximately
40dBm<http://en.wikipedia.org/wiki/DBm>(10 watts) effective
radiated power <http://en.wikipedia.org/wiki/Effective_radiated_power>."

Source: http://en.wikipedia.org/wiki/Automatic_Picture_Transmission

Vy! 73 de Artur SP5QA