Bert PA1B has analysed my recent reception on WSPR by PY2RN to see just how little power could have been used and still be successfully decoded in Brazil - the answer is very little for a lot of the time! Most times even 1mW should have been enough. This of course assumes local noise levels allow decoding to the lowest levels for WSPR at around -30dB S/N. In some cases this may not be possible because of local QRN/QRM.
16 Apr 2014
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Hello Roger, this table gives the number of spot per hour for a given "calculated lowest possible power" in mW.
The propagation can be seen from day to day over more than 2 weeks. Thank you for posting the table.
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