JA8ISU — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: QN23

Receiver-side FT8 activity involving JA8ISU, decoded by SO8OO in southeastern Poland. 9 FT8 messages attributed to this token as transmitter, on 160m, 80m, across 3 UTC dates in the available aggregate history. Observed between 2026-07-06 and 2026-10-29.

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 9 FT8 messages attributed to JA8ISU as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (89%), followed by 80 m (11%). In this small sample, the estimated median decoder S/N was -12 dB; no usual signal pattern is inferred.

Overview

9
Messages attributed
3
UTC dates decoded
6
Active 15-min windows
-12 dB
Estimated median S/N

Bands

160m · 8 80m · 1
First attributed message: 2026-07-06
Last attributed message: 2026-10-29 20:48 UTC

Observed FT8 message patterns

Attributed sample
9 messages
Active dates
3 UTC dates
Estimated median S/N
-12 dB
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 0.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with JA8ISU in decoded directed-looking exchanges:

Most frequent locator attributed to JA8ISU

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
QN23 · 3 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,258 km (approx.)
Last such locator decoded
2026-10-29 20:31 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 UTCBandJA8ISU S/NCounterpartCounterpart S/NMsgsCapture
11-04 20:24 80m - / - RK6OQ +7 / - 3 Partial capture
11-04 20:23 80m - / - YO2MTG -5 / - 4 Partial capture
11-04 19:39 160m - / -2 SV8QG -12 / - 4 ✓ Closing fragment
11-01 20:50 80m - / -15 YO3FBD -2 / - 7 ✓ Closing fragment
11-01 20:49 80m - / -20 SP1D +15 / - 5 ✓ Closing fragment
11-01 20:48 80m - / -16 YO2MAX +8 / - 2 ✓ Closing fragment
11-01 20:39 80m - / -24 R5AJ +2 / - 4 ✓ Closing fragment
10-31 20:13 160m - / - UR4LRG +17 / - 2 ✓ Closing fragment
10-29 21:00 160m - / - DB8WK -12 / - 10 Partial capture
10-29 20:51 160m - / -15 SP6JZL +18 / - 5 ✓ Closing fragment
10-29 20:50 160m - / - IZ3QQG +4 / - 2 Partial capture
10-29 20:49 160m - / -18 IW4AOT +1 / - 2 Partial capture
10-29 20:45 160m - / -12 SP7JLH +16 / - 3 ✓ Closing fragment
10-29 20:39 160m - / - 9A2G -4 / - 8 Partial capture
10-29 20:39 160m - / - GM3YTS -9 / - 2 Partial capture
10-29 20:39 160m - / - OM0RX -6 / - 3 Partial capture
10-29 20:38 160m - / - IS0ZOD +1 / - 2 Partial capture
10-29 20:34 160m - / -18 ON8DM -2 / - 3 ✓ Closing fragment
10-29 20:27 160m - / -15 ON7NQ +3 / - 3 Partial capture
10-29 20:27 160m -18 / -19 EW4M +11 / - 4 ✓ Closing observed
10-02 20:18 160m -12 / - R7AW -13 / - 2 ✓ Closing observed
10-02 20:16 160m - / - LA6YEA +2 / - 2 Partial capture
10-02 20:15 160m -11 / -18 SV1FKZ -15 / -24 4 Partial capture
10-02 20:06 160m -10 / - YL2EA +6 / -9 7 Partial capture
10-02 20:05 160m - / -9 OK2BPU -4 / - 2 Partial capture
10-02 19:58 160m - / -23 SP8VJV +7 / - 5 ✓ Closing fragment
10-02 19:49 160m - / - SP6ZC -8 / - 5 Partial capture
10-02 19:48 160m - / +2 GM4YXI -8 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
205115  -5 1130  JA8ISU YO3FBD -15
205115 +19  334  JA8ISU SP1D R-20
205145  -4 1130  JA8ISU YO3FBD -15
205145 +20  334  JA8ISU SP1D 73
205215  -1 1130  JA8ISU YO3FBD -15 (x3)
202400  -8 1166  JA8ISU R1CL KO59
202315  -7 1653  JA8ISU YO2MTG KN05 (x3)
202415  +9  424  JA8ISU RK6OQ KN87
202445  -2 1653  JA8ISU YO2MTG KN05
202445  +8  424  JA8ISU RK6OQ KN87 (x2)
160m 
UTC    dB Audio  Message
210245  -8  670  JA8ISU DB8WK JO33 (x9)
201345 +19 2691  JA8ISU UR4LRG KO80 (x2)
193900 -20 1464  JA8ISU SV8QG KM39 (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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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