IU5RBX — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving IU5RBX, decoded by SO8OO in southeastern Poland. 401 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 37 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-20.
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 401 FT8 messages attributed to IU5RBX as the transmitting token by decoded message structure across 37 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (56%), followed by 40 m (27%) and 10 m (8%). Most decodes (58%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.
Overview
Bands
Last attributed message: 2026-09-20 19:39 UTC
Observed FT8 message patterns
- Attributed sample
- 401 messages
- Active dates
- 37 UTC dates
- Estimated median S/N
- -14 dB
- Estimated 10th-90th percentile
- -21 to -6 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 164, moderate (-15 to -9 dB) 179, strong (≥ -8 dB) 58.
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 IU5RBX 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 IU5RBX
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
- JN53 · 334 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,089 km (approx.)
- Last such locator decoded
- 2026-09-20 19:38 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 | IU5RBX S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-20 19:39 | 80m | - / - | F5MXH | -6 / - | 2 | Partial capture |
| 09-20 19:37 | 80m | -11 / - | EA6Y | +12 / -4 | 7 | ✓ Closing observed |
| 09-13 18:27 | 40m | -16 / - | SV9QWC | - / -8 | 5 | ✓ Closing fragment |
| 09-11 04:56 | 40m | -13 / - | F5OYA/P | - / -4 | 4 | Partial capture |
| 09-11 04:41 | 40m | -15 / - | J38DX | - / -23 | 17 | ✓ Closing fragment |
| 09-09 16:08 | 60m | - / -4 | Z68PX | -4 / - | 2 | ✓ Closing fragment |
| 09-04 19:35 | 80m | -19 / - | SV8JE | - / - | 3 | Partial capture |
| 09-04 04:12 | 40m | -8 / - | KQ4RLN | - / - | 11 | Partial capture |
| 08-31 20:54 | 80m | -22 / - | OH0Z | - / - | 3 | Partial capture |
| 08-31 20:51 | 80m | -24 / -11 | 9A3TGY | -2 / -15 | 7 | ✓ Full exchange observed |
| 08-30 13:16 | 20m | -12 / - | RI1FJL | - / - | 2 | Partial capture |
| 08-29 00:51 | 40m | -15 / - | V47JA | - / - | 5 | Partial capture |
| 08-29 00:45 | 40m | -15 / - | <...> | - / -1 | 2 | Partial capture |
| 08-29 00:44 | 40m | -6 / - | OA4ENG | - / - | 2 | Partial capture |
| 08-29 00:16 | 40m | -16 / - | RI1FJL | - / -18 | 6 | ✓ Closing fragment |
| 08-28 16:36 | 20m | -12 / - | RI1FJL | - / - | 2 | Partial capture |
| 08-28 16:15 | 20m | - / - | IU5HIU | -3 / - | 3 | Partial capture |
| 08-28 16:14 | 20m | -9 / - | RI1FJL | - / - | 15 | Partial capture |
| 08-28 16:03 | 20m | -13 / - | RI1FJL | - / - | 4 | Partial capture |
| 08-28 14:16 | 20m | - / - | F5PBG | -21 / - | 2 | Partial capture |
| 08-28 14:12 | 20m | -13 / -17 | RD0L | -17 / -17 | 8 | ✓ Full exchange observed |
| 08-26 21:07 | 20m | -11 / - | RI1FJL | - / - | 6 | Partial capture |
| 08-26 20:57 | 20m | -1 / - | VP2VKC | - / - | 9 | Partial capture |
| 08-26 20:56 | 20m | -6 / - | RI1FJL | - / - | 2 | Partial capture |
| 08-26 20:03 | 20m | -7 / - | RI1FJL | - / - | 12 | Partial capture |
| 08-23 21:57 | 40m | -16 / - | XV9B | - / - | 4 | Partial capture |
| 08-23 21:03 | 40m | -10 / - | VK3YW | - / - | 2 | Partial capture |
| 08-21 06:58 | 20m | -10 / - | SV9AUP | - / - | 2 | Partial capture |
| 08-21 06:53 | 20m | -7 / - | SV9AUP | - / - | 6 | Partial capture |
| 08-19 17:22 | 20m | - / -3 | GJ0KYZ | -21 / - | 2 | Partial capture |
| 08-19 17:21 | 20m | -12 / - | R2AL | - / -7 | 2 | ✓ Closing fragment |
| 08-19 17:19 | 20m | -16 / - | <...> | - / -4 | 2 | Partial capture |
| 08-19 17:02 | 20m | -13 / - | OY5T | - / - | 12 | Partial capture |
| 08-19 13:13 | 10m | -20 / - | YU7VD | - / -18 | 2 | Partial capture |
| 08-18 23:49 | 40m | -2 / - | <...> | - / -15 | 2 | Partial capture |
| 08-07 11:13 | 20m | -18 / - | F5SFT | - / - | 2 | Partial capture |
| 08-07 05:08 | 20m | -14 / - | N5CH | - / - | 4 | Partial capture |
| 08-07 04:54 | 20m | -17 / - | P40AA | - / -2 | 9 | Partial capture |
| 08-07 04:51 | 20m | -12 / - | ZL3BWE | - / - | 2 | Partial capture |
| 08-07 04:48 | 20m | -20 / - | KN7E | - / - | 3 | Partial capture |
| 08-07 04:46 | 20m | -18 / - | AD9GE | - / - | 2 | Partial capture |
| 08-07 04:44 | 20m | -18 / - | KE0RVP | - / - | 2 | Partial capture |
| 08-07 04:40 | 20m | -16 / - | P40AA | - / - | 4 | Partial capture |
| 08-07 04:35 | 20m | -16 / - | NL8F | - / - | 2 | Partial capture |
| 08-07 04:29 | 20m | -18 / - | P40AA | - / - | 4 | Partial capture |
| 08-07 04:26 | 20m | -12 / - | WA3JAT | - / - | 2 | Partial capture |
| 08-07 04:21 | 20m | -16 / - | NC5T | - / -15 | 4 | Partial capture |
| 08-06 06:35 | 20m | -16 / - | 5N0YEN | - / - | 15 | Partial capture |
| 08-06 06:31 | 20m | -15 / - | TI5RR | - / -10 | 5 | ✓ Closing fragment |
| 08-06 05:33 | 20m | - / -4 | UA4FKT | -5 / - | 4 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 205500 -21 1940 OH0Z IU5RBX JN53 (x2) 193445 -21 1620 EI4KF IU5RBX JN53 193545 -21 1621 SV8JE IU5RBX JN53 (x3) 193700 -7 1966 EA6Y IU5RBX JN53 (x5) 193915 +12 2342 IU5RBX EA6Y RR73 193930 -11 1966 EA6Y IU5RBX 73 193945 -7 1966 IU5RBX F5MXH JN07 (x2)
UTC dB Audio Message 045700 -6 1719 F5OYA/P IU5RBX JN53 (x2) 045745 -8 2478 IU5RBX SV8/F2VX -12 045800 -19 1719 F5OYA/P IU5RBX R-04 050030 -16 1712 RA1NBG IU5RBX JN53 182715 -17 1783 SV9QWC IU5RBX JN53 (x5) 193445 -5 1784 DF9HT/P IU5RBX JN53 193515 +5 1990 RW6MD/MM IU5RBX JN53 193730 -4 2840 IU5RBX SV8/F6BLP +00 205800 -10 1902 SK150LM IU5RBX R-08 205900 -6 1549 OH7ML IU5RBX JN53
UTC dB Audio Message 193415 -13 1874 9A7BB IU5RBX JN53 193500 -2 1207 IU5RBX 9A7BB +01 (x8) 193500 -9 1671 <...> IU5RBX JN53 (x3) 160830 +0 305 IU5RBX Z68PX -04 (x2)
UTC dB Audio Message 161715 -11 1838 RI1FJL IU5RBX JN53 (x9) 162230 +3 2854 IU5RBX IU5HIU JN53 162245 -11 1838 RI1FJL IU5RBX JN53 (x5)
UTC dB Audio Message 180845 -20 1654 7Q9BK IU5RBX JN53 115645 -21 1988 OD5JL IU5RBX JN53 (x5) 174730 -22 1752 ZP6KFX IU5RBX JN53 091445 -24 1936 VK0DS IU5RBX JN53 (x3) 203215 -21 1990 XQ2OP IU5RBX JN53 (x3) 131345 -21 2029 YU7VD IU5RBX JN53 (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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