N4SIM — FT8 activity observed at SO8OO

Observed FT8 message patterns

Attributed sample

7 messages

Active dates

2 UTC dates

Estimated median S/N

-15 dB

S/N percentile sample

Too small

Recurring-pattern threshold

Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 5, strong (≥ -8 dB) 0.

WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with N4SIM in decoded directed-looking exchanges:

Most frequent locator attributed to N4SIM

The map compares the centres and boundaries of the locator field attributed to this token by decoded message structure, 2° × 1° as a Maidenhead square, and SO8OO's six-character receiver square. The separation is not an exact antenna-to-antenna distance or a radio-path length.

Attributed locator

FN31 · 3 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

6,913 km (approx.)

Last such locator decoded

2026-09-21 01:55 UTC

A decoded locator can describe portable, remote or special-event operation and is not proof of a permanent station address or transmitter identity.

Observed FT8 exchanges

S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

UTC    dB Audio  Message
045915  -3  790  N4SIM F1DXP JN05 (x8)
053330  +9  865  N4SIM DH1JG JO31
055230  -6  737  N4SIM F1MXE JN05 (x2)
055330  -2 2737  N4SIM F5LOW -01
055330  -9  737  N4SIM F1MXE 73
055400  -6  737  N4SIM F5LOW RR73 (x2)

Decoder S/N history by band

Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.