OP4F — reception at SO8OO
Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.
FT8 activity
Receiver-side FT8 activity involving OP4F, decoded by SO8OO in southeastern Poland. 91 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 15 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-11-04.
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 91 FT8 messages attributed to OP4F as the transmitting token by decoded message structure across 15 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (73%), followed by 10 m (20%) and 80 m (7%). Most decodes (90%) fell within the six-hour window 09:00-15:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's weak S/N range (85%); the estimated median was -20 dB.
Overview
Bands
Last attributed message: 2026-11-04 14:08 UTC
Observed FT8 message patterns
- Attributed sample
- 91 messages
- Active dates
- 15 UTC dates
- Estimated median S/N
- -20 dB
- Estimated 10th-90th percentile
- -24 to -14 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 77, moderate (-15 to -9 dB) 14, strong (≥ -8 dB) 0.
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 OP4F 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 OP4F
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
- JO21 · 56 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,192 km (approx.)
- Last such locator decoded
- 2026-11-04 14:08 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 | OP4F S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 11-04 14:06 | 40m | -21 / - | ON7AC | - / - | 3 | Partial capture |
| 11-04 14:05 | 40m | - / - | 9A4ZM | -4 / - | 2 | Partial capture |
| 11-04 14:04 | 40m | - / - | OE2VDL | -7 / - | 3 | Partial capture |
| 11-04 14:04 | 40m | -21 / - | PE1EXQ | -17 / - | 2 | ✓ Closing observed |
| 11-04 14:03 | 40m | - / - | HA7TM | +4 / - | 2 | Partial capture |
| 11-04 14:01 | 40m | -20 / - | M7DQO | - / -10 | 2 | Partial capture |
| 11-04 14:00 | 40m | -18 / - | GB1RBL | - / -11 | 2 | Partial capture |
| 11-02 10:49 | 40m | -16 / - | 6W/IK2HKT | - / -5 | 2 | Partial capture |
| 11-02 10:47 | 40m | -17 / - | ON6KHI | -19 / -1 | 3 | ✓ Full exchange observed |
| 11-02 08:34 | 40m | - / - | 9A4ZM | -14 / - | 2 | Partial capture |
| 11-01 11:58 | 40m | -18 / - | ON3KHZ | - / -14 | 2 | Partial capture |
| 11-01 10:26 | 10m | -14 / - | 5Z4RS | - / - | 15 | Partial capture |
| 11-01 10:23 | 10m | -18 / - | PA0HCL | - / - | 2 | Partial capture |
| 11-01 08:29 | 80m | - / - | HB3YBK | -19 / - | 3 | Partial capture |
| 11-01 08:29 | 80m | -18 / - | F6FHZ | - / -16 | 2 | Partial capture |
| 11-01 08:27 | 80m | - / -2 | DJ0MDC | -14 / - | 2 | Partial capture |
| 11-01 08:21 | 80m | -19 / - | ON3MOH | - / 0 | 3 | ✓ Closing fragment |
| 10-30 13:56 | 40m | -19 / - | PA0WDN | - / - | 3 | Partial capture |
| 10-30 13:02 | 40m | -24 / - | ON4CVL | - / -2 | 2 | ✓ Closing fragment |
| 10-30 13:00 | 40m | - / - | DH2NJS | -12 / - | 2 | Partial capture |
| 10-29 12:05 | 40m | -24 / +8 | DL7ACA | -13 / 0 | 4 | ✓ Full exchange observed |
| 10-29 11:22 | 40m | -24 / - | ON7AC | - / - | 2 | Partial capture |
| 10-29 07:46 | 40m | - / - | DK8EW | -6 / - | 4 | Partial capture |
| 10-28 13:17 | 40m | -22 / - | SQ8V | - / - | 2 | Partial capture |
| 10-28 12:34 | 40m | - / - | 9A4ZM | -12 / - | 2 | Partial capture |
| 10-28 12:33 | 40m | -20 / - | ON5JDB | -21 / -7 | 3 | ✓ Closing observed |
| 10-28 12:27 | 40m | -20 / -13 | SQ8V | 0 / -15 | 3 | ✓ Full exchange observed |
| 10-28 12:24 | 40m | - / -4 | ON1DGN | -16 / - | 2 | ✓ Closing fragment |
| 10-22 09:27 | 40m | -21 / - | ON8LX | - / -9 | 2 | Partial capture |
| 10-09 10:29 | 40m | - / - | 9A4ZM | -12 / - | 2 | Partial capture |
| 10-09 10:27 | 40m | - / - | S53AK | -10 / - | 6 | Partial capture |
| 10-09 10:23 | 40m | - / - | OS7P | -10 / - | 2 | ✓ Closing fragment |
| 10-07 12:21 | 40m | - / - | HG8LXL | -7 / - | 4 | Partial capture |
| 10-07 12:16 | 40m | - / - | 9A4ZM | -10 / - | 2 | Partial capture |
| 10-07 12:16 | 40m | - / - | HG8LXL | -3 / - | 4 | Partial capture |
| 09-29 14:51 | 40m | -20 / - | ON4JM | -14 / 0 | 2 | Partial capture |
| 09-23 13:31 | 40m | - / - | 9A1CCB | -3 / - | 7 | Partial capture |
| 09-23 13:24 | 40m | -20 / -11 | DL6BAD | -15 / - | 2 | ✓ Closing observed |
| 09-23 12:58 | 40m | - / +1 | PF7DKW | -14 / - | 2 | ✓ Closing fragment |
| 09-23 12:57 | 40m | - / - | 9A4ZM | -2 / - | 2 | Partial capture |
| 09-23 12:56 | 40m | -21 / - | PA7ZZ | -11 / - | 2 | ✓ Closing observed |
| 09-23 12:48 | 40m | - / +1 | OZ3AAF | -2 / - | 2 | ✓ Closing fragment |
| 09-23 12:41 | 40m | - / +1 | OZ1SMB | -11 / - | 2 | ✓ Closing fragment |
| 09-23 12:39 | 40m | - / - | ON8LX | -18 / - | 2 | ✓ Closing fragment |
| 09-23 12:36 | 40m | - / - | PA3ATR | -8 / - | 2 | ✓ Closing fragment |
| 09-23 12:34 | 40m | - / - | OZ1SMB | -12 / - | 2 | Partial capture |
| 09-23 12:32 | 40m | -23 / +8 | PA3AGN | -14 / -5 | 5 | ✓ Full exchange observed |
| 09-21 10:37 | 40m | - / +9 | PE9JAN | -13 / - | 2 | ✓ Closing fragment |
| 09-20 11:14 | 40m | - / - | S53AK | -5 / - | 3 | Partial capture |
| 09-20 11:14 | 40m | -20 / - | ON3CCM | - / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 140315 -23 1752 CQ OP4F JO21 a1 140330 +4 1752 OP4F HA7TM JN97 140400 -10 1595 OP4F UR5WD KO20 140400 +5 1752 OP4F HA7TM JN97 140430 -17 1753 OP4F PE1EXQ RR73 140430 -6 2267 OP4F OE2VDL JN67 140445 -21 1752 PE1EXQ OP4F 73 140500 -7 2267 OP4F OE2VDL JN67 140500 -1 1748 OP4F 9A4ZM JN86 140530 -7 2268 OP4F OE2VDL JN67 140530 -7 1748 OP4F 9A4ZM JN86 140600 -20 1985 ON7AC OP4F JO21 (x3) 141100 -14 2177 OP4F OE2VDL JN67
UTC dB Audio Message 102600 -11 1989 5Z4RS OP4F JO21 (x15)
UTC dB Audio Message 082115 -22 1726 ON3MOH OP4F JO21 (x3) 082245 -23 1726 DM5NSA OP4F -09 082445 -13 852 OP4F ON5AI +05 082745 -16 2501 OP4F DJ0MDC JN58 (x2) 082900 -18 1666 F6FHZ OP4F -16 082945 -22 1601 OP4F HB3YBK JN36 083000 -19 1666 F6FHZ OP4F -16 083045 -17 1601 OP4F HB3YBK JN36 (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.
CW
No CW receptions recorded for this callsign in the last 30 days.
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