JF6FFS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM53

Receiver-side FT8 activity involving JF6FFS, decoded by SO8OO in southeastern Poland. 29 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-26 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 29 FT8 messages attributed to JF6FFS as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (79%), followed by 40 m (21%). 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 -12 dB.

Overview

29
Messages attributed
5
UTC dates decoded
9
Active 15-min windows
-12 dB
Estimated median S/N

Bands

40m · 6 20m · 23
First attributed message: 2026-06-26
Last attributed message: 2026-09-10 21:23 UTC

Observed FT8 message patterns

Attributed sample
29 messages
Active dates
5 UTC dates
Estimated median S/N
-12 dB
Estimated 10th-90th percentile
-21 to 0 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 11, moderate (-15 to -9 dB) 4, strong (≥ -8 dB) 14.

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 JF6FFS 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 JF6FFS

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
PM53 · 17 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,425 km (approx.)
Last such locator decoded
2026-09-10 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.

Time UTCBandJF6FFS S/NCounterpartCounterpart S/NMsgsCapture
09-20 20:45 80m - / -16 YL3CW +6 / - 2 ✓ Closing fragment
09-10 21:21 40m - / -13 SV8/F6BLP +6 / - 2 Partial capture
09-10 21:02 40m -15 / -23 EI2CN +15 / - 5 Partial capture
08-28 21:09 40m - / - RW6HPS -11 / - 3 Partial capture
08-28 21:08 40m -16 / - CN8NS - / -11 2 ✓ Closing fragment
08-28 21:08 40m - / -5 Z34K -2 / - 4 ✓ Closing fragment
08-28 07:19 10m - / -9 ON6AA +6 / - 4 ✓ Closing fragment
08-28 07:16 10m - / -17 IK4TVP -19 / - 5 ✓ Closing fragment
08-24 11:29 10m - / -13 ON4IQ -10 / - 4 ✓ Closing fragment
08-06 22:11 20m - / -4 7X5CY -4 / - 2 ✓ Closing fragment
08-06 22:06 20m - / -13 7X5CY -6 / - 2 Partial capture
08-02 08:06 10m - / - IT9CCB -7 / - 2 ✓ Closing fragment
07-21 21:31 20m - / - IK1RQX -13 / - 3 Partial capture
07-21 21:21 20m -3 / - TU5MM - / -12 15 Partial capture
07-16 21:27 40m - / -21 EA8UP -10 / - 6 ✓ Closing fragment
07-10 22:21 20m - / - HB9DDS -24 / - 2 ✓ Closing fragment
07-07 21:08 20m -20 / - CT1FIU - / -13 2 ✓ Closing fragment
07-07 21:02 20m - / -15 DL0BSO -14 / - 6 Partial capture
07-07 21:01 20m -20 / - EA5TC - / -20 4 ✓ Closing fragment
07-07 20:57 20m - / -10 F5JAE -5 / - 4 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
204515  +7 2397  JF6FFS YL3CW -16 (x2)
40m 
UTC    dB Audio  Message
210900 -14 1860  JF6FFS RW6HPS LN15
210930  +3  568  JF6FFS Z34K KN01
210930 -11 1860  JF6FFS RW6HPS LN15
211000  -8 1860  JF6FFS Z34K R-05 (x2)
211130  -9 1860  JF6FFS RW6HPS LN15
205600 -15 2375  EI2CN JF6FFS PM53 (x3)
210415 +12  361  JF6FFS EI2CN -23 (x3)
212130  +5 2838  JF6FFS SV8/F6BLP -13 (x2)
212315 -14 2387  VP5/K5UR JF6FFS R-23
10m 
UTC    dB Audio  Message
080715  -4  930  JF6FFS IT9CCB 73
112900 -11 2470  JF6FFS ON4IQ JO20 (x4)
071600 -24 1154  JF6FFS F5ADE RRR
071630 -24 1693  JF6FFS IK4TVP -17 (x4)
071900  +6 2950  JF6FFS ON6AA JO11
071900 -11 1693  JF6FFS IK4TVP RR73
071930  +5 2950  JF6FFS ON6AA JO11 (x3)
20m 
UTC    dB Audio  Message
212630  -1 2971  TU5MM JF6FFS PM53 (x8)
213145 -13 1517  JF6FFS IK1RQX JN44 (x3)
220600  -9  536  JF6FFS 7X5CY -13 (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.

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