ON4APU — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving ON4APU, decoded by SO8OO in southeastern Poland. 293 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 24 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-04.
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 293 FT8 messages attributed to ON4APU as the transmitting token by decoded message structure across 24 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (48%), followed by 40 m (31%) and 80 m (14%). Most decodes (74%) fell within the six-hour window 15:00-21:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (68%); the estimated median was -3.1 dB.
Overview
Bands
Last attributed message: 2026-09-04 15:01 UTC
Observed FT8 message patterns
- Attributed sample
- 293 messages
- Active dates
- 24 UTC dates
- Estimated median S/N
- -3.1 dB
- Estimated 10th-90th percentile
- -15 to +12 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 23, moderate (-15 to -9 dB) 72, strong (≥ -8 dB) 198.
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 ON4APU 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 ON4APU
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
- JO11 · 176 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,331 km (approx.)
- Last such locator decoded
- 2026-09-04 15:01 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 UTC | Band | ON4APU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-04 15:01 | 40m | -6 / - | <...> | - / -13 | 2 | Partial capture |
| 09-03 19:25 | 80m | -4 / - | R3ZBY | -10 / - | 2 | ✓ Closing observed |
| 09-03 19:20 | 80m | -11 / +1 | R3YAU | -1 / - | 3 | ✓ Closing observed |
| 09-03 19:17 | 80m | 0 / - | <...> | - / 0 | 3 | Partial capture |
| 09-03 19:14 | 80m | 0 / -6 | R6KX | 0 / -11 | 6 | ✓ Full exchange observed |
| 09-03 19:11 | 80m | - / +4 | DK7TX | -7 / - | 2 | ✓ Closing fragment |
| 09-03 19:10 | 80m | 0 / -17 | <...> | -6 / -5 | 6 | Partial capture |
| 09-02 18:08 | 40m | +6 / -5 | YO4NT | +6 / -1 | 4 | ✓ Full exchange observed |
| 09-02 18:07 | 40m | +4 / - | SQ100PKP | - / -8 | 2 | Partial capture |
| 09-02 18:04 | 40m | -7 / 0 | 3Z100PKP | -8 / -2 | 3 | Partial capture |
| 09-02 18:03 | 40m | +4 / - | EJ8JCB | - / -7 | 2 | ✓ Closing fragment |
| 09-02 18:00 | 40m | 0 / -21 | EG42SDC | -8 / - | 6 | Partial capture |
| 09-02 17:59 | 40m | -8 / - | <...> | - / - | 2 | Partial capture |
| 08-29 19:29 | 80m | - / -13 | UR3HC | +7 / - | 2 | Partial capture |
| 08-29 19:29 | 80m | - / -15 | SP5FWT | +2 / - | 3 | Partial capture |
| 08-29 19:19 | 80m | +4 / -4 | SP9WAZ | +3 / -5 | 5 | ✓ Full exchange observed |
| 08-29 19:18 | 80m | +2 / -3 | DO2BBC | -2 / -5 | 4 | ✓ Full exchange observed |
| 08-29 19:15 | 80m | -1 / - | SP1905MFK | - / -18 | 4 | Partial capture |
| 08-26 08:00 | 40m | -14 / - | ON6CQ | - / - | 4 | Partial capture |
| 08-26 07:48 | 40m | -21 / -4 | SN40KZE | -12 / - | 3 | Partial capture |
| 08-25 14:44 | 20m | +8 / - | <...> | - / -10 | 4 | Partial capture |
| 08-21 20:24 | 80m | -10 / -12 | SV8TCK | +11 / -8 | 6 | Partial capture |
| 08-21 20:22 | 80m | -6 / +1 | <...> | -11 / -2 | 5 | Partial capture |
| 08-21 20:12 | 20m | +2 / - | BA8BLK | - / -10 | 2 | ✓ Closing fragment |
| 08-21 20:10 | 20m | +5 / - | DS2MGT | - / -15 | 2 | ✓ Closing fragment |
| 08-21 20:08 | 20m | +12 / - | UA0LQE | - / -16 | 2 | Partial capture |
| 08-21 20:07 | 20m | +15 / - | BD6IIC | - / -16 | 2 | ✓ Closing fragment |
| 08-21 20:06 | 20m | +7 / - | DL1R | +11 / -17 | 10 | Partial capture |
| 08-21 19:51 | 20m | +3 / - | <...> | - / -22 | 10 | Partial capture |
| 08-21 19:36 | 80m | -8 / - | <...> | - / - | 2 | Partial capture |
| 08-18 19:58 | 60m | - / - | YO6LM | +8 / - | 2 | Partial capture |
| 08-18 19:57 | 60m | -6 / - | <...> | - / -7 | 2 | Partial capture |
| 08-15 18:48 | 20m | +9 / - | <...> | - / - | 2 | Partial capture |
| 08-10 16:08 | 20m | 0 / - | <...> | - / -8 | 8 | Partial capture |
| 08-10 15:43 | 20m | -1 / - | <...> | - / -11 | 2 | Partial capture |
| 08-10 15:39 | 20m | 0 / - | <...> | - / -13 | 2 | Partial capture |
| 08-10 04:37 | 40m | - / -19 | EN35UKR | -6 / - | 2 | Partial capture |
| 08-06 19:37 | 60m | -11 / - | EA3RO | - / -14 | 3 | ✓ Closing fragment |
| 08-06 19:33 | 60m | 0 / - | <...> | - / 0 | 2 | Partial capture |
| 08-06 19:30 | 20m | -1 / - | <...> | - / - | 3 | Partial capture |
| 07-21 19:31 | 40m | - / -1 | E70SZ | +3 / - | 3 | ✓ Closing fragment |
| 07-21 19:28 | 40m | -14 / -22 | UX7QV | -11 / -15 | 4 | ✓ Full exchange observed |
| 07-21 19:26 | 40m | -12 / -7 | YO4FRF | -7 / -11 | 19 | ✓ Full exchange observed |
| 07-21 19:25 | 40m | -6 / +7 | DL3JHK | -10 / - | 3 | ✓ Closing observed |
| 07-21 19:23 | 40m | -8 / -9 | IQ4JO | 0 / -11 | 4 | ✓ Full exchange observed |
| 07-21 19:18 | 40m | -8 / -4 | SQ3TR | -11 / -14 | 5 | ✓ Full exchange observed |
| 07-21 19:16 | 40m | -12 / - | SV1TRJ | - / -12 | 2 | ✓ Closing fragment |
| 07-21 19:16 | 40m | -12 / -8 | DK3TNA | -18 / 0 | 6 | ✓ Full exchange observed |
| 07-21 19:13 | 40m | -14 / - | PD1LVK | - / -10 | 2 | ✓ Closing fragment |
| 07-21 19:10 | 40m | -16 / - | DH5BM | - / -9 | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 180500 -6 535 ON4APU EG42SDC -05 180515 -6 1315 3Z100PKP ON4APU R-02 180700 +5 652 SQ100PKP ON4APU JO11 180715 -8 1295 ON4APU 3Z100PKP +00 180730 +3 652 SQ100PKP ON4APU R-08 180815 +8 2219 ON4APU YO4NT -05 180830 +5 653 YO4NT ON4APU R-01 180845 +4 2218 ON4APU YO4NT RR73 180900 +7 653 YO4NT ON4APU 73 101045 -18 1175 HF100PKP ON4APU JO11 101100 +9 1044 ON4APU SQ100PKP -01 101130 +7 1044 ON4APU RR73; HG0NPJ <...> +16 143730 -11 755 R2FBW ON4APU JO11 150115 -6 704 <...> ON4APU JO11 (x2)
UTC dB Audio Message 191500 +2 2562 ON4APU R6KX RR73 191515 +4 799 R6KX ON4APU 73 (x3) 191715 +0 800 <...> ON4APU JO11 (x2) 191800 +15 2625 ON4APU SP100PKP +10 191815 -1 799 <...> ON4APU R+00 191830 +17 2625 ON4APU RR73; UR5TMT <...> -06 192000 -11 799 R3YAU ON4APU JO11 192015 +2 1733 ON4APU R3YAU +01 (x2) 192115 -12 226 ON4APU R3ZBY -10 (x2) 192530 -4 800 R3ZBY ON4APU 73
UTC dB Audio Message 200915 +11 2656 ON4APU DL1R JN58 200930 +10 779 CQ ON4APU JO11 200945 +10 2656 ON4APU DL1R JN58 201000 +3 779 CQ ON4APU JO11 201015 +11 2656 ON4APU DL1R JN58 201015 +0 834 ON4APU DB9LG JO40 201030 +2 779 DS2MGT ON4APU R-15 201045 +12 2656 ON4APU DL1R JN58 201100 +8 779 DS2MGT ON4APU 73 201200 +4 779 BA8BLK ON4APU R-10 (x2) 144415 +14 2463 <...> ON4APU JO11 (x4)
UTC dB Audio Message 193345 +0 2603 <...> ON4APU JO11 193400 +7 929 ON4APU HG25CCS -04 193415 -1 2603 <...> ON4APU R+00 193645 -10 1948 CQ ON4APU JO11 193715 -11 1948 EA3RO ON4APU -14 (x3) 193845 -13 1948 CQ ON4APU JO11 193930 -15 996 ON4APU OE5YCP JN68 195715 -5 825 <...> ON4APU JO11 195730 -11 2450 ON4APU DQ30GDXF -01 195745 -6 824 <...> ON4APU R-07 195830 +7 2514 ON4APU YO6LM KN25 (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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