S51Z — reception at SO8OO

Observed FT8 message patterns

Attributed sample

282 messages

Active dates

9 UTC dates

Estimated median S/N

+2 dB

Estimated 10th-90th percentile

-6 to +9 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 10, strong (≥ -8 dB) 269.

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 S51Z 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 S51Z

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 · 162 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

631 km (approx.)

Last such locator decoded

2026-11-04 23:23 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
231400  -3 2230  C31KC S51Z JN76 (x10)
232315 -11 1882  IS0IYX S51Z JN76
232330  -6 2461  S51Z IS0IYX -11
232345  -5 1881  IS0IYX S51Z R-09
232400  +2 2461  S51Z IS0IYX RR73
232415  -6 1881  IS0IYX S51Z 73

UTC    dB Audio  Message
222300  -4 2270  S51Z G1CEC IO83
222330  -7  446  S51Z RR73; IZ1JIZ <...> -10
222330  -4 2269  S51Z G1CEC IO83 (x5)
223830 -24 1539  S51Z 8Z1IT -06

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.