S51DD — reception at SO8OO

Observed FT8 message patterns

Attributed sample

2,808 messages

Active dates

34 UTC dates

Estimated median S/N

-2.7 dB

Estimated 10th-90th percentile

-16 to +6 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 308, moderate (-15 to -9 dB) 517, strong (≥ -8 dB) 1,983.

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 S51DD 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 S51DD

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 · 1,665 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

631 km (approx.)

Last such locator decoded

2026-09-27 16:11 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
190645 -22 2076  ZV8R S51DD R-15
190745 -22 2074  CD3GSC S51DD JN76 (x3)
191600 -23 2089  LU1EEP S51DD JN76
093830  -8 2419  S51DD RM8L MO27 (x2)
105830 -20 1590  S51DD CS7BPG IN51 (x3)
124600 -14 2293  S51DD HB9AMO JN36 (x2)
085030 -17 2194  S51DD RT8T LO71 (x2)
075900  -9  763  S51DD R9FF RRR

UTC    dB Audio  Message
072045 -13 1912  ON8WR S51DD RR73
072115 -18 1912  CQ S51DD JN76 (x3)
072245 -18 1911  MW7RHR S51DD -10 (x2)
072345 -22 1911  CQ S51DD JN76 (x9)

UTC    dB Audio  Message
075245  -4 2185  CQ S51DD JN76 (x7)
075600  +2 2777  S51DD G4CFS IO91
075615 +11 2187  CQ S51DD JN76
075630  -1 2777  S51DD G4CFS IO91
075645  +8 2187  CQ S51DD JN76
081600 -24 2310  S51DD OE3EHS JN87 (x4)

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.