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Re: OT - Weather sats
- Subject: [amsat-bb] Re: OT - Weather sats
- From: Artur <sp5qan@xxxxxxxxx>
- Date: Thu, 12 Jun 2008 12:35:38 +0200
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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
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