JA4FKX — FT8 activity observed at SO8OO

Observed FT8 message patterns

Attributed sample

1,433 messages

Active dates

56 UTC dates

Estimated median S/N

-5 dB

Estimated 10th-90th percentile

-14.5 to +9 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 116, moderate (-15 to -9 dB) 374, strong (≥ -8 dB) 943.

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 JA4FKX 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 JA4FKX

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

PM64 · 534 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

8,453 km (approx.)

Last such locator decoded

2026-09-07 21:03 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
210330  -3  410  HB9EBM JA4FKX PM64
210345 +15 2954  JA4FKX HB9EBM -13 (x7)
203730 -10 1896  JA4FKX PD7BDN JO22
203730 -15 1982  JA4FKX UF5F KO98
203800  -2 1896  JA4FKX PD7BDN JO22
204730 -10 2486  E77PY JA4FKX R-16 (x2)
141545  +1  403  JA4FKX RA4FP -06
175130  -6  894  W1AW/4 JA4FKX R-08

UTC    dB Audio  Message
200700  +2 1378  JA4FKX YO5QDN KN17 (x4)
200845  +7 1394  JA4FKX SQ2PQ JO94
200900  +1 1378  JA4FKX YO5QDN KN17
200915  +7 1395  JA4FKX SQ2PQ JO94 (x7)
204130  +5 1697  JA4FKX IR7MGGC -02
205000 -24 2016  OZ7OX JA4FKX PM64

UTC    dB Audio  Message
191115  -7 1372  F4DXP JA4FKX 73
202330  -2 2732  EA7FPF JA4FKX PM64
202730 -19 1984  EA5JLN JA4FKX PM64 (x2)
204145  -3 2937  F5NKX JA4FKX PM64
204200  +9 2933  JA4FKX F5NKX -11
204215  -6 2937  F5NKX JA4FKX R-17
204230  +1 2933  JA4FKX F5NKX RR73
204245  -5 2937  F5NKX JA4FKX 73
154930  -7 2439  DF2AM JA4FKX PM64 (x2)
155300 -10 1379  YO8RCA JA4FKX 73
155315  +5 1061  JA4FKX RU6FK -10 (x3)

UTC    dB Audio  Message
092030  -4  721  JA4FKX F4ETS JN25 (x3)
092330  -4  719  JA4FKX LZ3BS KN22 (x3)
092730 -12  721  JA4FKX F5BZB -01
094300 +12  556  JA4FKX Z34K -10 (x2)
094630 -21 1562  JA4FKX EA8AP -08 (x2)
095000 -23 1638  JA4FKX F4IBJ R-15 (x2)
083730  -9 2677  JA4FKX IK3VZO 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.