I don’t mean to start an argument here but I have never associated Doppler shift with an RF path between 2 FIXED objects where the distance between them does not change. ?When the transmitter is at a fixed location and the receiver is at a fixed location, where is the movement happening that causes the Doppler shift? ?Aren’t we really talking about multi-path cancellation? ?That commonly affects VHF and above. ?The way to deal with multi-path is to use multiple polarization or even circular polarization at one or both of the antennas. ?Am I missing something??
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On Sep 2, 2023, at 3:01 PM, Da Amazin' man G0FTD via groups.io <punkbiscuit@...> wrote:
?On Sat, Sep 2, 2023 at 08:22 PM, GIUSEPPE wrote:
Good evening everyone, I agree with what Jerry wrote, the WSPR propagation does not determine the openings in SSB,
WSPR allows a typical signal of 30db below the noise to be confirmed depending upon the decode engine used.
1 watt of WSPR = 1000 watts of SSB for a typical S1 signal of SSB.
If you get a decode of -30db on WSPR then you need 1000 watts of SSB to make the trip with
an S1 signal.
WSPR reveals a path, but it doesn't guarantee that some some one on SSB is listening, or
has 1kw ERP to make the trip.
Whence the disparity of WSPR reports vs actual SSB QSO's.
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- 73 de Andy -
