The 50% successful decodes treshold was -26.9dB for JT9(-1) and -29.3dB for JT9(-2), so 2.4dB in favour of JT9-2.
But is has to be said that just pure white noise was added (no static crashes etc...) and the signals were perfectly stable. No TX/RX drift, no ionospheric effects. All these might reduce the JT9-2 advantage.
Therefor test reports with (very) weak signals are most welcome.
Van: [email protected]
> namens N1BUG <[email protected]
Verzonden: maandag 12 november 2018 13:15
Aan: [email protected]
; [email protected]
Onderwerp: LF: MF JT9-2 report
I decoded 4 stations on JT9-2 last night: KU4XR, N2END, WB4JWM,
K5DNL. KU4XR was visible many times on the waterfall without decodes
but he did have drift varying from 3 Hz / period to 8 Hz / period. I
never saw any decodes reported below -24 SNR, which if I understand
correctly is really -27. This is no better than JT9-1 but may be
just a matter of not enough data collected, no really weak signals
during the test period.
Let's keep the tests going! I need to see some weaker signals to
test the mode. As soon as I can get out to the antenna site to
install the variometer and transformer, I will join in for some
transmitting and QSOs.
This morning I tried to check for additional overnight decodes but I
found the program had exited (crashed) sometime during the night. I
looked in the program folder and found a decoded.txt file with just
one line in it. I guess that was the last decode before the crash?