S51DI — reception at SO8OO

Observed FT8 message patterns

Attributed sample

1,511 messages

Active dates

23 UTC dates

Estimated median S/N

+7 dB

Estimated 10th-90th percentile

-5 to +15 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 18, moderate (-15 to -9 dB) 54, strong (≥ -8 dB) 1,439.

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 · 1,167 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

631 km (approx.)

Last such locator decoded

2026-11-06 06:30 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
151615  +4 1779  VE7SZ S51DI R-09 (x4)
062615  -9 1650  6W/IK2HKT S51DI JN76 (x7)
063015  +3 1649  ZL2AGY S51DI JN76 (x4)

UTC    dB Audio  Message
171500 -20 2047  S51DI IW2MLJ R-09
171515  +9 2044  EX7DY S51DI R-16
171530 -14 2046  S51DI IW2MLJ R-09
171545  +6 2044  EX7DY S51DI 73
171700 +11 2044  RW9MZ S51DI JN76 (x6)
180215  +6 1788  UN7LAN S51DI JN76 (x5)

UTC    dB Audio  Message
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)
062830 -22 2085  S51DI TA1MB KN41 (x2)
063000 -11 1600  S51DI F8MRQ JN17

UTC    dB Audio  Message
182145  -8 1976  RI1FJZ S51DI JN76 (x10)
162645  +8 1974  H49A S51DI R-20 (x5)

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.