RX4SA — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving RX4SA, decoded by SO8OO in southeastern Poland. 2,375 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 81 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-06.
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 2,375 FT8 messages attributed to RX4SA as the transmitting token by decoded message structure across 81 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (39%), followed by 40 m (34%) and 80 m (26%). Most decodes (84%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.
Overview
Bands
Last attributed message: 2026-10-06 17:02 UTC
Observed FT8 message patterns
- Attributed sample
- 2,375 messages
- Active dates
- 81 UTC dates
- Estimated median S/N
- -12 dB
- Estimated 10th-90th percentile
- -20 to -3 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 688, moderate (-15 to -9 dB) 887, strong (≥ -8 dB) 800.
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 RX4SA 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 RX4SA
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
- LO36 · 1,644 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,817 km (approx.)
- Last such locator decoded
- 2026-10-06 14:57 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 | RX4SA S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-06 17:07 | 40m | - / -2 | YO3AI | -4 / - | 2 | ✓ Closing fragment |
| 10-06 17:00 | 40m | - / -14 | R2EA | +3 / - | 2 | ✓ Closing fragment |
| 10-06 14:57 | 40m | -20 / - | UA3ZMQ | - / - | 2 | ✓ Closing fragment |
| 10-06 14:55 | 40m | -20 / - | UD3T | - / -12 | 2 | Partial capture |
| 10-06 14:54 | 40m | -20 / - | UA3XDR | - / - | 2 | Partial capture |
| 10-05 19:16 | 40m | -10 / - | UA3PTK | - / +1 | 3 | ✓ Closing fragment |
| 10-05 19:11 | 40m | - / -17 | R6DFI | -18 / - | 2 | ✓ Closing fragment |
| 10-05 19:05 | 40m | -4 / -9 | HB9ELE | +16 / -5 | 4 | ✓ Full exchange observed |
| 10-05 18:59 | 80m | -14 / -9 | DC5IMM | +13 / - | 6 | ✓ Closing observed |
| 10-05 18:58 | 80m | - / -11 | R3KBY | -17 / - | 3 | Partial capture |
| 10-05 18:52 | 80m | -14 / - | R7CD | - / - | 3 | Partial capture |
| 10-05 18:49 | 80m | - / -19 | UB3LBU | -4 / - | 4 | ✓ Closing fragment |
| 10-05 18:48 | 80m | -6 / -5 | R4RJ | -14 / -12 | 3 | ✓ Full exchange observed |
| 10-05 18:44 | 80m | - / -14 | YL3AUL | -13 / - | 5 | Partial capture |
| 10-05 18:36 | 80m | -14 / - | RA3ZOM | - / - | 6 | Partial capture |
| 10-05 18:35 | 80m | -17 / - | RX3ASQ | - / - | 2 | Partial capture |
| 10-05 18:28 | 80m | -6 / -2 | RL3P | +6 / -10 | 3 | ✓ Full exchange observed |
| 10-05 18:27 | 80m | -3 / - | RA4ABH | - / -1 | 3 | ✓ Closing fragment |
| 10-05 18:00 | 80m | -4 / - | RA3RPW | - / - | 10 | Partial capture |
| 10-05 17:33 | 80m | -7 / - | UA3VVA | - / - | 3 | Partial capture |
| 10-05 17:31 | 80m | -9 / +2 | RK4F | 0 / - | 6 | ✓ Full exchange observed |
| 10-05 17:27 | 80m | -8 / - | UA4FKT | -2 / - | 4 | ✓ Closing observed |
| 10-05 17:22 | 80m | -9 / - | UA3VVA | - / - | 6 | Partial capture |
| 10-05 17:19 | 80m | -16 / -15 | RN5M | -16 / -6 | 4 | ✓ Full exchange observed |
| 10-05 16:42 | 40m | -13 / - | R8OAE | - / -16 | 5 | Partial capture |
| 10-05 16:39 | 40m | -12 / - | R7DX | - / - | 2 | Partial capture |
| 10-05 06:28 | 40m | - / -3 | EU4U | +6 / - | 2 | ✓ Closing fragment |
| 10-05 05:50 | 40m | - / -15 | UA3YPS | -10 / - | 2 | ✓ Closing fragment |
| 10-05 05:48 | 40m | - / -19 | 9A60CBM | -18 / - | 2 | Partial capture |
| 10-04 20:20 | 80m | -5 / -2 | YO6BGT | 0 / - | 7 | Partial capture |
| 10-04 20:17 | 80m | -6 / - | OZ7CL | - / -7 | 2 | ✓ Closing fragment |
| 10-04 20:01 | 80m | -7 / - | R6AO | - / -15 | 3 | ✓ Closing fragment |
| 10-04 19:58 | 80m | - / - | F5RAV | -12 / - | 2 | Partial capture |
| 10-04 19:49 | 80m | -10 / - | R4PF | - / - | 4 | Partial capture |
| 10-04 19:24 | 160m | - / -5 | HA1BF | +9 / - | 2 | Partial capture |
| 10-04 19:23 | 80m | -4 / -5 | HA1BF | +15 / -12 | 2 | Partial capture |
| 10-04 19:21 | 80m | -4 / - | R3RAO | - / -18 | 3 | ✓ Closing fragment |
| 10-04 19:13 | 40m | -14 / - | UA6XDA | - / - | 2 | Partial capture |
| 10-04 19:01 | 40m | - / +8 | OE5ROR | -4 / - | 2 | Partial capture |
| 10-04 18:45 | 40m | - / -19 | OZ9FF | -10 / - | 2 | ✓ Closing fragment |
| 10-04 18:39 | 40m | -13 / - | OZ1KZX | - / - | 3 | Partial capture |
| 10-04 18:29 | 40m | -12 / -11 | YO4GIY | -8 / -4 | 2 | Partial capture |
| 10-04 18:23 | 40m | -16 / -11 | HB9EFK | +10 / - | 4 | ✓ Closing observed |
| 10-04 17:55 | 40m | - / -13 | R5ZQ | +3 / - | 3 | ✓ Closing fragment |
| 10-04 17:52 | 40m | -14 / - | UN8PC | - / -9 | 2 | Partial capture |
| 10-04 17:49 | 40m | -16 / - | TA7MMI | -2 / -1 | 5 | ✓ Closing observed |
| 10-04 17:41 | 40m | - / -7 | OT8T | -15 / - | 5 | Partial capture |
| 10-04 17:13 | 40m | -14 / -9 | YL3CW | -5 / - | 3 | ✓ Closing observed |
| 10-04 17:11 | 40m | - / -2 | RU3GC | 0 / - | 2 | ✓ Closing fragment |
| 10-03 19:59 | 80m | - / +3 | UA3IDQ | -13 / - | 2 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 191645 -9 2320 UA3PTK RX4SA R+01 (x2) 145400 -19 1735 UA3XDR RX4SA LO36 (x2) 145530 -20 1735 UD3T RX4SA LO36 (x2) 145730 -20 1735 UA3ZMQ RX4SA LO36 (x2) 150015 -10 1735 R9CP RX4SA R+07 165900 -22 1736 UD7N RX4SA 73 170030 +3 801 RX4SA R2EA -14 (x2) 170230 -14 1736 R4DB RX4SA R+09 170715 -4 1598 RX4SA YO3AI -02 (x2)
UTC dB Audio Message 184930 -4 1496 RX4SA UB3LBU KO63 (x3) 185230 -14 2289 R7CD RX4SA LO36 (x3) 185830 -16 1273 RX4SA R3KBY -11 (x2) 185900 -17 2289 DC5IMM RX4SA LO36 185915 +12 1129 RX4SA DC5IMM -09 185930 -17 1274 RX4SA R3KBY -11 185945 +13 1129 RX4SA DC5IMM RR73 (x3) 190100 -12 2289 DC5IMM RX4SA 73
UTC dB Audio Message 192430 +9 1116 RX4SA HA1BF -05 (x2)
UTC dB Audio Message 052000 -11 1824 RX4SA EA5HEU JN00 (x7) 053945 -15 2230 LY5A RX4SA LO36 (x6) 171545 -8 2125 RX4SA IK2LRF -09 171700 -12 1894 IK2LRF RX4SA R-11
UTC dB Audio Message 062330 -14 2068 RX4SA UA3WG KO71 (x3) 062830 +3 322 RX4SA RA6OY KN88 (x3) 120745 -10 1383 RX4SA LZ2IP -22 (x5) 101045 -16 2329 RX4SA <...> RR73 (x2) 092215 -7 1442 RX4SA F5OYC -07 (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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