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The Antarctic WSPR station on Neumayer station heard my 500 mW signal on 40m. I was in WSPR transmit mode.

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What matters in radio propagation is power spectral density, the bandwidth is really small, (6 Hz) and the power is roughly that what you put in a flashlight. More about station Neumayer can be found here.

Last update: 7-Feb-2018

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