IU5RTR — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving IU5RTR, decoded by SO8OO in southeastern Poland. 596 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 47 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-18.
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 596 FT8 messages attributed to IU5RTR as the transmitting token by decoded message structure across 47 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (60%), followed by 10 m (21%) and 40 m (18%). Most decodes (56%) fell within the six-hour window 05:00-11:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8 dB.
Overview
Bands
Last attributed message: 2026-09-18 06:02 UTC
Observed FT8 message patterns
- Attributed sample
- 596 messages
- Active dates
- 47 UTC dates
- Estimated median S/N
- -8 dB
- Estimated 10th-90th percentile
- -17 to +3 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 91, moderate (-15 to -9 dB) 193, strong (≥ -8 dB) 312.
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 IU5RTR 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 IU5RTR
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 · 345 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,089 km (approx.)
- Last such locator decoded
- 2026-09-18 06:02 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 | IU5RTR S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-15 05:39 | 40m | -10 / - | W4DR | - / - | 2 | Partial capture |
| 09-15 05:32 | 40m | -5 / - | ZL1OGX | - / - | 3 | ✓ Closing fragment |
| 09-15 05:30 | 40m | +6 / - | ZL3RC | - / - | 2 | Partial capture |
| 09-10 06:28 | 40m | -5 / - | ZL1OGX | - / - | 3 | Partial capture |
| 09-10 06:24 | 40m | -2 / - | VP5/K5UR | - / - | 2 | Partial capture |
| 09-10 05:59 | 40m | -10 / - | K4A | - / -24 | 4 | ✓ Closing fragment |
| 09-07 06:33 | 40m | -3 / - | KX8XX | - / -3 | 3 | ✓ Closing fragment |
| 09-04 06:59 | 40m | -6 / - | ZL1BRL | - / - | 2 | Partial capture |
| 09-04 06:40 | 40m | -1 / - | VA2YVP | - / +4 | 3 | ✓ Closing fragment |
| 09-02 11:23 | 10m | -7 / - | KG6DX | - / - | 2 | Partial capture |
| 09-02 07:39 | 40m | -13 / - | MW9VVX | - / - | 2 | Partial capture |
| 09-02 07:24 | 40m | -12 / -11 | YO3GNF | -6 / -14 | 8 | ✓ Full exchange observed |
| 09-02 07:24 | 40m | - / -2 | F1PBZ | -11 / - | 2 | ✓ Closing fragment |
| 09-02 07:22 | 40m | -9 / - | SQ6PZL | -6 / -13 | 3 | Partial capture |
| 09-01 05:53 | 40m | -8 / - | KS2D | - / - | 2 | Partial capture |
| 09-01 05:43 | 40m | -10 / - | RI1FJL | - / - | 2 | Partial capture |
| 08-31 07:18 | 20m | -1 / - | W4QLC | - / - | 2 | Partial capture |
| 08-28 12:28 | 20m | +6 / - | VE1MDF | - / - | 2 | Partial capture |
| 08-28 12:16 | 20m | -2 / - | KC3JEQ | - / -13 | 2 | ✓ Closing fragment |
| 08-28 12:14 | 20m | +10 / - | VA3KTT | - / - | 2 | Partial capture |
| 08-28 06:19 | 40m | -10 / - | KB1YTO | - / - | 2 | Partial capture |
| 08-27 10:13 | 10m | +4 / - | JF0JYR | - / - | 2 | Partial capture |
| 08-27 09:48 | 10m | -5 / - | 8Z1IT | - / - | 6 | ✓ Closing fragment |
| 08-27 09:37 | 10m | -5 / - | VK4XA | - / -8 | 10 | ✓ Closing fragment |
| 08-27 09:33 | 10m | -6 / - | BG0EMF | - / - | 3 | Partial capture |
| 08-27 09:04 | 10m | -8 / - | CN8NS | - / - | 7 | Partial capture |
| 08-27 08:29 | 20m | -4 / - | KS1WK | - / -16 | 3 | ✓ Closing fragment |
| 08-27 08:25 | 20m | +6 / - | VK6OX | - / - | 4 | Partial capture |
| 08-27 08:06 | 20m | +16 / - | AH6WP | - / - | 2 | Partial capture |
| 08-27 05:48 | 40m | +2 / - | ON7HM | - / - | 2 | ✓ Closing fragment |
| 08-27 05:47 | 40m | +2 / 0 | S55OO | -5 / +3 | 5 | ✓ Full exchange observed |
| 08-27 05:46 | 40m | -3 / - | N1WI | - / -23 | 3 | ✓ Closing fragment |
| 08-26 14:05 | 20m | -2 / - | WR1GHT | - / - | 2 | Partial capture |
| 08-26 13:52 | 20m | -14 / - | W9YK | - / - | 2 | Partial capture |
| 08-26 08:22 | 20m | +12 / - | RI1FJL | - / - | 3 | Partial capture |
| 08-12 09:49 | 20m | -12 / - | DG3AWF | - / -24 | 2 | Partial capture |
| 08-10 07:10 | 20m | -2 / - | VK3HA | - / -13 | 2 | ✓ Closing fragment |
| 08-07 13:24 | 20m | -13 / - | <...> | - / -1 | 4 | Partial capture |
| 08-07 06:50 | 20m | -20 / - | N0WUD | - / -11 | 2 | ✓ Closing fragment |
| 08-07 06:42 | 20m | -8 / +2 | F5HNQ | +1 / +2 | 7 | ✓ Full exchange observed |
| 08-07 06:42 | 20m | -14 / -5 | RX3ASQ | +2 / -12 | 5 | ✓ Full exchange observed |
| 08-07 06:31 | 20m | -10 / - | SV2AJX | - / -21 | 2 | ✓ Closing fragment |
| 08-05 13:44 | 20m | -18 / - | WQ4S | - / - | 2 | Partial capture |
| 08-05 07:54 | 20m | -12 / - | AH6HY | - / -9 | 4 | ✓ Closing fragment |
| 08-05 07:49 | 20m | -6 / - | AH6HY | - / - | 2 | Partial capture |
| 08-04 14:02 | 20m | -6 / - | WV2B | - / -6 | 2 | Partial capture |
| 08-04 13:11 | 20m | -18 / - | K7USN | - / -11 | 2 | ✓ Closing fragment |
| 07-31 07:26 | 20m | -8 / - | KC1QYX | - / - | 2 | Partial capture |
| 07-31 07:21 | 20m | -8 / - | KR3Y | - / -5 | 5 | Partial capture |
| 07-31 07:08 | 20m | -6 / - | VA3HYH | - / -17 | 3 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 062545 -6 2693 IH9/IT9JUI IU5RTR JN53 062645 -1 2771 SQ100PKP IU5RTR JN53 062815 -3 242 ZL1OGX IU5RTR JN53 (x3) 053015 +7 2742 ZL3RC IU5RTR JN53 (x2) 053245 -7 242 ZL1OGX IU5RTR JN53 (x3) 053530 -11 2114 IU5RTR TK/4O7CC +05 053545 -17 1903 W6EEN/P IU5RTR R+09 053915 -8 1109 W4DR IU5RTR JN53 (x2) 060230 -8 1292 NI9D IU5RTR JN53
UTC dB Audio Message 094345 -7 1360 VK4XA IU5RTR JN53 (x5) 094815 +10 656 8Z1IT IU5RTR JN53 (x6) 101345 +7 2663 JF0JYR IU5RTR JN53 (x2) 112330 -9 2199 KG6DX IU5RTR JN53 (x2)
UTC dB Audio Message 082930 -4 2127 KS1WK IU5RTR JN53 (x3) 121430 +6 2713 VA3KTT IU5RTR JN53 (x2) 121630 -4 737 KC3JEQ IU5RTR R-13 (x2) 122800 +7 2280 VE1MDF IU5RTR JN53 (x2) 123430 -5 2165 WA1ZYX IU5RTR JN53 133730 +8 571 N1FMB IU5RTR JN53 134045 +3 1103 K1FIE IU5RTR JN53 071215 +3 1075 W4QLC IU5RTR JN53 (x3)
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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