Power |
EIRP | Distance | Magnitude | Bandwidth | CNR |
| 1 kW | 2.3 x 1018 W | 10 L.Y. | +23 | 1 Hz | 34 dB |
| 1 MW | 2.3 x 1021 W | 10 L.Y. | +15.5 | 10 kHz | 24 dB |
| 1 GW | 2.3 x 1024 W | 10 L.Y. | +8 | 30 MHz | 19 dB |
| 1 GW | 2.3 x 1024 W | 10 L.Y. | +8 | 4.6 GHz | -3 dB |
Wavelength = 656 nm, 10 meter diameter T/R telescopes.
1 Light Year (L.Y.) = 9.461 x 1015 m.
Eye sensitivity = 6th magnitude.
Planckian starlight at 2nd magnitude ignored.
A 1 GW transmitted signal is just below the threshold for naked eye visibility in very good seeing conditions. This received signal would be strong enough for high quality "real-time" FM modulated NTSC/PAL TV signals (30 MHz bandwidth). An incoherent filter with spectral resolution of 1 part in 100,000 would have a bandpass of 0.0066 nm, equivalent to an optical bandwidth of 4.6 GHz. In this situation, the recovered CNR would be -3 dB, and thus the signal would not be detectable without further post-detection signal integration. A high-resolution spectrometer/CCD system would detect this signal because such instrumentation integrates the received signal for a considerable period of time.
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