airspy-fmradion v0.6.14-pre2-dev commit 7abb1a980038516b092426bd69a4269f315d5c6
NHK-FM Osaka 880Hz time tone (distance 20km)
Airspy HF+ R2.6.1
with a dipole antenna up 15m above the ground in the balcony

768kHz: shifted +192kHz, default filter 
        (-192, +138kHz, rolling off above +138kHz)
384/256/192kHz: no software IF filter

Measured date/time in JST: (-5 sec to 0 sec)
JST (Japan Standard Time) =  UTC + 9 hours
768kHz: 14-JUL-2019 0500JST
384kHz: 15-JUL-2019 0100JST
256kHz: 15-JUL-2019 0200JST
192kHz: 15-JUL-2019 0300JST

sox play stats: left channel RMS Lev dB
Audio output 100% mod: -6.02dB (x 0.5) -> actual time tone level: ~-12dBFS
100% mod = +-75kHz deviation
880Hz: time tone (sine wave) as is without being filtered
880Hz: 880Hz filtered-out remainder of the time tone (for SINAD measurement)

[dB]
768kHz no-sound: -76.23 880Hz: -18.25 880Hz-notched: -64.10 SINAD: 45.85
384kHz no-sound: -75.27 880Hz: -18.25 880Hz-notched: -64.24 SINAD: 45.99
256kHz no-sound: -76.05 880Hz: -18.32 880Hz-notched: -63.96 SINAD: 45.64
192kHz no-sound: -75.25 880Hz: -18.53 880Hz-notched: -63.86 SINAD: 45.33

SINAD 45.85dB = THD+N 0.5099%
SINAD 45.99dB = THD+N 0.5018%
SINAD 45.64dB = THD+N 0.5224%
SINAD 45.33dB = THD+N 0.5414%

For reference only
NHK-FM Osaka 6-JUL-2019 1100JST
Mono (no stereo demod)
[dB]
768kHz no-sound: -84.87 880Hz: -18.34 880Hz-notched: -68.12 SINAD: 49.78
THD+N: 0.3243%

