Hi All,
Initially, every S level was defined textually. You can see it on
Wikipedia. Later, this practice has been changed, fixing the S9 level at
50 µV on 50 Ω, with a 6 dB difference between each S level step.
In relation with WSJTX, a conversion between the S/N as displayed by
WSJTX and the RST is not possible on this base.
Considering that the ADIF spec is imprecise concerning the admissible
values of the RST_RCVD and RST_SENT fields, I prefer to avoid conflicts
with some sites and programs, using only values corresponding to the
regular expression [1-5][1-9][1-9]? in these fields. Therefore I have
to convert. Rather than using S9 as a reference, I'm using S1, initially
defined as "Faint—signals barely perceptible" and I consider it as
corresponding to -28 dB S/N. I calculate the S level according to this
own definition. I consider R fixed at 5 and T fixed at 9. A good idea ? Hmm…
Best wishes,
Claude (DJ0OT)
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