RU7J — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving RU7J, decoded by SO8OO in southeastern Poland. 15 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-07-31 and 2026-09-16.
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 15 FT8 messages attributed to RU7J as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (73%), followed by 40 m (27%). In this small sample, the estimated median decoder S/N was -10 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-09-16 22:55 UTC
Observed FT8 message patterns
- Attributed sample
- 15 messages
- Active dates
- 2 UTC dates
- Estimated median S/N
- -10 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 3, strong (≥ -8 dB) 7.
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 RU7J in decoded directed-looking exchanges:
Most frequent locator attributed to RU7J
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
- LN23 · 4 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,899 km (approx.)
- Last such locator decoded
- 2026-09-16 22:43 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 | RU7J S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-16 22:54 | 80m | -6 / -3 | RV9CD | -24 / -12 | 5 | ✓ Full exchange observed |
| 09-16 22:48 | 80m | -4 / - | RG8U | - / -9 | 2 | ✓ Closing fragment |
| 09-16 22:45 | 80m | -9 / -12 | YO4DWD | -11 / -12 | 5 | ✓ Full exchange observed |
| 09-16 22:41 | 80m | -11 / - | RI1FJZ | - / -22 | 5 | ✓ Closing fragment |
| 07-31 01:40 | 40m | -19 / - | VE2OPR | - / -20 | 3 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 224415 -11 1665 RI1FJZ RU7J R-22 (x2) 224500 -13 1467 RU7J YO4DWD -12 (x2) 224545 -8 1467 YO4DWD RU7J R-12 224600 -12 1467 RU7J YO4DWD RR73 224615 -10 1467 YO4DWD RU7J 73 224630 -20 1454 RU7J DL9KM JN68 224815 -7 1803 RG8U RU7J -09 (x2) 225430 -24 807 RU7J RV9CD MO06 225445 -6 808 RV9CD RU7J -12 225500 -24 807 RU7J RV9CD R-03 225515 -7 807 RV9CD RU7J RR73 225530 -24 807 RU7J RV9CD 73
UTC dB Audio Message 013530 -21 1504 AA2S RU7J LN23 014030 -18 1504 VE2OPR RU7J -20 (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.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee