JA9NFO — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM86

Receiver-side FT8 activity involving JA9NFO, decoded by SO8OO in southeastern Poland. 93 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 11 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-10.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 93 FT8 messages attributed to JA9NFO as the transmitting token by decoded message structure across 11 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (82%), followed by 40 m (18%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8 dB.

Overview

93
Messages attributed
11
UTC dates decoded
18
Active 15-min windows
-8 dB
Estimated median S/N

Bands

40m · 17 20m · 76
First attributed message: 2026-06-06
Last attributed message: 2026-09-10 21:11 UTC

Observed FT8 message patterns

Attributed sample
93 messages
Active dates
11 UTC dates
Estimated median S/N
-8 dB
Estimated 10th-90th percentile
-15 to -1 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 6, moderate (-15 to -9 dB) 35, strong (≥ -8 dB) 52.

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 JA9NFO in decoded directed-looking exchanges:

Most frequent locator attributed to JA9NFO

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
PM86 · 57 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,497 km (approx.)
Last such locator decoded
2026-09-10 21:11 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.

Time UTCBandJA9NFO S/NCounterpartCounterpart S/NMsgsCapture
09-19 20:02 160m - / - UT6HN +11 / - 5 Partial capture
09-18 18:07 160m - / -22 ES2AJ 0 / - 3 ✓ Closing fragment
09-10 21:10 40m -7 / - TA7MMI - / - 2 Partial capture
09-10 21:09 40m -5 / - IN3IZQ - / - 2 Partial capture
09-10 21:06 40m -9 / - EI2CN - / - 2 Partial capture
09-10 21:05 40m -9 / - UT0IN - / -19 2 ✓ Closing fragment
09-10 21:03 40m -8 / -12 IK5ZPV -5 / - 5 ✓ Closing observed
09-10 21:03 40m -8 / - UA1CEI/3 - / - 2 Partial capture
09-08 21:23 40m -11 / - SV9/SV1ABB - / - 2 Partial capture
09-08 21:18 40m -10 / - RC0AT/P - / -16 3 Partial capture
09-06 20:34 80m - / -21 UA3QQG -11 / - 3 ✓ Closing fragment
09-06 20:33 80m - / -15 UA4POO -12 / - 2 ✓ Closing fragment
09-06 20:31 80m - / - R3VA -11 / - 2 Partial capture
09-06 20:28 80m - / -15 OK2BUZ +17 / - 4 Partial capture
09-06 20:23 80m - / -15 OK2BUZ +18 / - 4 Partial capture
09-01 21:11 40m - / - EA3AAY -12 / - 2 Partial capture
09-01 20:52 40m - / -1 D2ACE -16 / - 2 ✓ Closing fragment
08-28 10:41 10m - / - DN9SGE -12 / - 9 Partial capture
08-28 10:37 10m - / -12 IU8ADS -8 / - 4 ✓ Closing fragment
08-28 07:30 10m - / -22 HB9ACA 0 / - 3 Partial capture
08-27 10:00 10m - / - F5LHI -10 / - 2 Partial capture
08-22 09:26 10m - / -25 LX1NO +6 / - 2 Partial capture
08-17 08:52 10m - / -7 SV2HTI -18 / - 2 ✓ Closing fragment
08-07 23:13 20m - / -18 EH1SGG -12 / - 2 ✓ Closing fragment
08-04 20:50 20m - / -15 CR7BRV -10 / - 2 ✓ Closing fragment
08-04 20:34 40m - / -21 HB9CZF -4 / - 2 Partial capture
08-02 21:24 20m - / - CT1EEX -7 / - 3 Partial capture
08-02 21:20 20m - / - CT1EEX -5 / - 3 Partial capture
08-02 21:19 20m - / - F4JDM +5 / - 2 Partial capture
08-02 21:17 20m - / -17 EA5FQ -17 / - 2 ✓ Closing fragment
08-02 21:14 20m - / -21 F4MZI -11 / - 4 Partial capture
08-02 21:14 20m - / -8 IU2SLI +1 / - 3 ✓ Closing fragment
08-02 21:12 20m - / - EA5FQ -9 / - 3 Partial capture
08-02 21:11 20m - / - 2E0DGP -14 / - 2 Partial capture
07-30 13:57 20m - / -7 R2DN -16 / - 3 ✓ Closing fragment
07-29 21:17 20m -14 / - SP1ZMO - / -18 3 ✓ Closing fragment
07-29 21:14 20m - / - M0KZC/P -2 / - 2 Partial capture
07-29 21:11 20m -16 / - IU5VMV - / -19 2 ✓ Closing fragment
07-29 21:07 20m -16 / - BH4ECL - / -12 2 ✓ Closing fragment
07-29 21:04 20m -15 / - YO4DWD - / -10 4 ✓ Closing fragment
07-25 20:52 20m - / - SM3ULU -11 / - 3 Partial capture
07-25 20:46 20m - / -10 IQ9SR -24 / - 2 ✓ Closing fragment
06-29 20:51 20m - / -12 CR2WWA -12 / - 4 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

160m 
UTC    dB Audio  Message
180745  -7 2421  JA9NFO ES2AJ -22 (x3)
200230 +12 2880  JA9NFO UT6HN KN69 (x5)
40m 
UTC    dB Audio  Message
210315  -4 1132  JA9NFO IK5ZPV JN53
210330  -7  793  UA1CEI/3 JA9NFO PM86
210345  -3 1132  JA9NFO IK5ZPV JN53 (x2)
210430  -8  793  IK5ZPV JA9NFO RR73
210445  -7 1132  JA9NFO IK5ZPV 73
210500  -7  793  UT0IN JA9NFO -19 (x2)
210600 -10  793  EI2CN JA9NFO PM86 (x2)
210930  -5  793  IN3IZQ JA9NFO PM86 (x2)
211030  -4  793  TA7MMI JA9NFO PM86 (x2)
204500 +10 2510  JA9NFO R7ZY KN98
80m 
UTC    dB Audio  Message
202330 +18 2800  JA9NFO OK2BUZ -15 (x8)
203100 -11 2054  JA9NFO R3VA LO05 (x2)
203330 -11 1946  JA9NFO UA4POO -15 (x2)
203400 -10 2056  JA9NFO UA3QQG -21 (x3)
10m 
UTC    dB Audio  Message
073130  -1 2283  JA9NFO HB9ACA -22
102300 -12  657  JA9NFO EA8WU -15
103700 -10  836  JA9NFO IU8ADS JN70 (x4)
104100 -13 2014  JA9NFO DN9SGE JO42 (x9)
20m 
UTC    dB Audio  Message
211630 -10 1480  JA9NFO F4MZI -21
211730 -12 1046  JA9NFO EA5FQ R-17 (x2)
211900  +8 1933  JA9NFO F4JDM JN07 (x2)
212000  -4 1612  JA9NFO CT1EEX IM58 (x6)
205045  -9  642  JA9NFO CR7BRV -15 (x2)
231315 -13 2048  JA9NFO EH1SGG -18 (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.

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