JA5NPV — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM63

Receiver-side FT8 activity involving JA5NPV, decoded by SO8OO in southeastern Poland. 4 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-07-21 and 2026-07-23.

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 4 FT8 messages attributed to JA5NPV as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The available sample contains attributed decodes on 20 m (100%). The sample is too small to infer a recurring UTC-hour or received-S/N pattern.

Overview

4
Messages attributed
2
UTC dates decoded
3
Active 15-min windows
-
S/N pattern not inferred

Bands

20m · 4
First attributed message: 2026-07-21
Last attributed message: 2026-07-23 19:46 UTC

Observed FT8 message patterns

Attributed sample
4 messages
Active dates
2 UTC dates
S/N summary
Too few decodes
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

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 JA5NPV in decoded directed-looking exchanges:

Most frequent locator attributed to JA5NPV

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
PM63 · 4 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,540 km (approx.)
Last such locator decoded
2026-07-23 19:46 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 UTCBandJA5NPV S/NCounterpartCounterpart S/NMsgsCapture
09-19 18:11 80m - / - ON4IQ +15 / - 2 Partial capture
09-19 17:43 80m - / -20 ON4IQ +9 / - 2 Partial capture
09-11 20:02 80m - / - IK0SHH +6 / - 4 Partial capture
09-05 18:21 40m - / -13 OZ7KJ/P +10 / - 2 Partial capture
09-03 20:26 40m - / - EA3EDU -12 / - 11 Partial capture
09-02 20:58 80m - / -9 V51WH -10 / - 2 ✓ Closing fragment
09-02 20:46 80m - / -14 YL3CW -7 / - 11 ✓ Closing fragment
08-31 06:08 20m - / -6 OA1F -6 / - 2 ✓ Closing fragment
08-30 19:05 40m - / - EA7ALL +10 / - 2 Partial capture
08-13 19:15 20m - / -21 HB9OAB 0 / - 3 Partial capture
08-12 19:56 80m - / -25 OH1MLZ +10 / - 4 ✓ Closing fragment
08-12 19:40 80m - / -13 EU3AA +11 / - 6 ✓ Closing fragment
08-12 19:09 20m - / - ON7NQ -4 / - 13 Partial capture
08-11 19:55 20m - / -19 EA1B 0 / - 2 ✓ Closing fragment
08-10 19:15 20m - / -17 M0CKX -14 / - 2 ✓ Closing fragment
08-10 19:14 20m - / - EA1B -12 / - 3 Partial capture
08-10 19:12 20m - / -3 EI4KF +6 / - 2 ✓ Closing fragment
08-06 23:47 20m - / -9 7X5CY -10 / - 2 Partial capture
08-06 19:47 20m - / -7 T77RN -5 / - 3 Partial capture
07-25 18:55 20m - / -8 CN2DX +5 / - 4 Partial capture
07-24 18:52 20m - / -13 EA8RCC -3 / - 2 Partial capture
07-23 19:23 20m - / -12 TN8GD -14 / - 2 ✓ Closing fragment
07-23 19:19 20m - / -14 EA1DP +2 / - 3 Partial capture
07-21 20:20 20m - / -11 EA5EN -11 / - 3 ✓ Closing fragment
07-21 20:14 20m -13 / -7 CN2DX +6 / - 5 ✓ Closing observed
07-18 21:28 20m - / -19 F4MUD -9 / - 4 Partial capture
07-11 20:38 20m - / -1 4X1YA -6 / - 2 ✓ Closing fragment
07-08 19:07 20m - / -16 CN2DX -10 / - 3 Partial capture
07-06 18:17 20m - / -17 JY5CG -14 / - 2 ✓ Closing fragment
07-05 20:27 20m - / -9 CR2WWA -14 / - 2 Partial capture
07-05 20:23 20m - / - EA3EDU +6 / - 2 Partial capture
06-26 18:56 40m - / -15 YL3CU -4 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
190600 +12  345  JA5NPV EA7ALL IM88
202630 -10 1628  JA5NPV EA3EDU JN01 (x11)
182115 +12 2417  JA5NPV OZ7KJ/P -13 (x2)
171730  +8 2187  JA5NPV UT9NA KN49
80m 
UTC    dB Audio  Message
204945  -7 2055  JA5NPV YL3CW RR73 (x5)
205830  -8 2577  JA5NPV V51WH -09 (x2)
200215  +3 1135  JA5NPV IK0SHH JN62 (x4)
174345  +7  586  JA5NPV ON4IQ -20 (x4)
20m 
UTC    dB Audio  Message
191115  +0 3022  JA5NPV ON7NQ JO21 (x10)
191545  -8 1759  JA5NPV HB9OAB -21 (x3)
060800  -8 3020  JA5NPV OA1F -06 (x2)
10m 
UTC    dB Audio  Message
100930 -23 1365  JA5NPV D2UY RR73

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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