Propagation S/N

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N2HMM
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Joined: 2009/10/05 - 01:32
Propagation S/N

Hello,

I have WSPR working very well with my FT-847 and SignalLink. I see my spots on WSPR NET and I'm amazed at the range I can achieve with low power. But I have a question about the S/N (or C/N) for a given path.

If a station receives my signal at say -20dB (for example) how much more energy would it take for a SSB, CW or PSK-31 modulation (for example) to make the same path? I understand there is significant coding gain and narrow bandwidth in WSPR not afforded with other modes.

73,

John
N2HMM