S51DI — FT8 activity observed at SO8OO

Observed FT8 message patterns

Attributed sample

1,175 messages

Active dates

12 UTC dates

Estimated median S/N

+9 dB

Estimated 10th-90th percentile

-2 to +15 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 13, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 1,139.

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.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with S51DI in decoded directed-looking exchanges:

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to S51DI

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

JN76 · 889 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

631 km (approx.)

Last such locator decoded

2026-09-17 19:30 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
192800 +12 1969  JA4FKX S51DI JN76 (x6)
193100 +10 1969  CT7AUT S51DI -17 (x8)
193500 +12 1969  JF8QNF S51DI RR73

UTC    dB Audio  Message
204815  +8 2159  RI1FJL S51DI JN76
053445 +12 1942  KB8U S51DI R-24 (x2)
192800 -18 2245  YC2BUZ S51DI JN76 (x4)
193715 -12 1155  BD8FOD S51DI JN76 (x2)
193815 -14 1155  ZS1WC S51DI JN76
193915 -14 1155  BD8FOD S51DI R-17 (x3)
194345 -14 1156  BG0FQU S51DI JN76 (x2)

UTC    dB Audio  Message
192630 -17 1502  S51DI RA4Y LO35
192630  -6 2081  S51DI 9A4ZM R+18
192700 -15 1985  S51DI RY6O KN87
192700  -4 2081  S51DI 9A4ZM 73
192715  -2 2085  9A4ZM S51DI 73
192730 -18 1985  S51DI RY6O KN87
192745  +2 2085  8S2A S51DI JN76
192800 -18 1985  S51DI RY6O KN87
192800 -22 2205  S51DI 8S2A +03
192815  -5 2085  8S2A S51DI R-17 (x2)
192930  -2 2085  PI4DX S51DI JN76
192945  +8 1051  S51DI PI4DX -02
193000  -2 2085  PI4DX S51DI R+09
193015 +13 1051  S51DI PI4DX RR73

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.