RC5B — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving RC5B, decoded by SO8OO in southeastern Poland. 24 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 1 UTC dates in the available aggregate history. Last observed 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 24 FT8 messages attributed to RC5B as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (75%), followed by 80 m (25%). In this small sample, the estimated median decoder S/N was +2 dB; no usual signal pattern is inferred.
Overview
Bands
Last attributed message: 2026-09-04 18:51 UTC
Observed FT8 message patterns
- Attributed sample
- 24 messages
- Active dates
- 1 UTC dates
- Estimated median S/N
- +2 dB
- Estimated 10th-90th percentile
- -4 to +6 dB
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 0, strong (≥ -8 dB) 24.
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 RC5B in decoded directed-looking exchanges:
Most frequent locator attributed to RC5B
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
- KO95 · 8 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,309 km (approx.)
- Last such locator decoded
- 2026-09-04 18:50 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 | RC5B S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-04 18:51 | 80m | - / - | R6ML | +6 / - | 2 | Partial capture |
| 09-04 18:47 | 80m | 0 / - | RI1FJL | - / -17 | 6 | ✓ Closing fragment |
| 09-04 18:34 | 40m | +5 / - | SV9QWC | - / -3 | 3 | ✓ Closing fragment |
| 09-04 18:33 | 40m | +1 / -2 | R1BDX | -12 / - | 3 | ✓ Closing observed |
| 09-04 18:31 | 40m | +3 / - | RL2F | - / -2 | 3 | ✓ Closing fragment |
| 09-04 18:27 | 40m | +6 / - | JA5NSR | - / -12 | 2 | ✓ Closing fragment |
| 09-04 18:25 | 40m | +3 / - | VJ6X | - / -19 | 3 | ✓ Closing fragment |
| 09-04 18:18 | 40m | -4 / -10 | SP6FME | -10 / -2 | 4 | ✓ Full exchange observed |
| 09-04 18:16 | 40m | -2 / - | RI1FJL | - / -5 | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 184730 -8 514 RI1FJL RC5B KO95 (x6) 185145 +4 558 RC5B R6ML LN17 (x2)
UTC dB Audio Message 182500 +2 901 VJ6X RC5B KO95 (x3) 182700 +6 901 G4DBW RC5B RR73 182730 +6 901 JA5NSR RC5B -12 (x2) 183115 +2 901 RL2F RC5B KO95 (x3) 183300 -11 900 RC5B R1BDX R-02 183315 +1 901 R1BDX RC5B RR73 183330 -12 901 RC5B R1BDX RR73 183430 +7 901 SV9QWC RC5B KO95 (x3)
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