SI4A — 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 SI4A, decoded by SO8OO in southeastern Poland. 354 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 17 UTC dates in the available aggregate history. Observed between 2026-06-15 and 2026-11-06.
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 354 FT8 messages attributed to SI4A as the transmitting token by decoded message structure across 17 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (71%), followed by 40 m (16%) and 160 m (6%). Most decodes (79%) fell within the six-hour window 22:00-04:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9.3 dB.
Overview
Bands
Last attributed message: 2026-11-06 00:13 UTC
Observed FT8 message patterns
- Attributed sample
- 354 messages
- Active dates
- 17 UTC dates
- Estimated median S/N
- -9.3 dB
- Estimated 10th-90th percentile
- -20 to +1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 85, moderate (-15 to -9 dB) 102, strong (≥ -8 dB) 167.
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 SI4A 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 SI4A
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
- JO69 · 257 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,202 km (approx.)
- Last such locator decoded
- 2026-11-06 00:13 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 | SI4A S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 11-06 16:52 | 160m | - / -17 | OT4A | -16 / - | 2 | ✓ Closing fragment |
| 11-06 00:08 | 80m | - / - | RD9U | -10 / - | 2 | Partial capture |
| 11-06 00:05 | 80m | 0 / - | HI8ML | - / - | 3 | Partial capture |
| 11-06 00:04 | 80m | +10 / -8 | DA6DNA | +6 / +2 | 9 | ✓ Full exchange observed |
| 11-06 00:02 | 80m | -1 / - | W5GW | - / - | 5 | Partial capture |
| 11-05 23:53 | 80m | -6 / -4 | DH1PS | +7 / - | 7 | ✓ Full exchange observed |
| 11-05 23:53 | 80m | -4 / -5 | EI3CTB | -18 / -11 | 4 | ✓ Full exchange observed |
| 11-05 23:52 | 80m | -5 / -19 | SV1HFE | -8 / -19 | 5 | ✓ Full exchange observed |
| 11-05 23:51 | 80m | -5 / -1 | CT7AUT | -16 / - | 4 | ✓ Closing observed |
| 11-05 22:11 | 80m | -16 / -8 | TA1MB | -18 / -13 | 4 | ✓ Full exchange observed |
| 11-05 22:09 | 80m | -15 / -5 | OK1UOZ | +13 / +2 | 7 | ✓ Full exchange observed |
| 11-05 22:06 | 80m | -16 / - | SN31ROT | - / -8 | 2 | Partial capture |
| 11-04 12:42 | 10m | - / -4 | EA7EZ | +1 / - | 3 | ✓ Closing fragment |
| 11-04 12:33 | 10m | - / - | CR7BUW | -22 / - | 2 | ✓ Closing fragment |
| 11-03 05:58 | 80m | - / -1 | M9PAS | -1 / - | 3 | ✓ Closing fragment |
| 11-03 05:52 | 80m | -19 / - | 6W/IK2HKT | - / - | 10 | Partial capture |
| 11-03 05:38 | 80m | -14 / - | RU4CK/P | - / - | 2 | Partial capture |
| 11-03 02:45 | 80m | -12 / - | 6W/IK2HKT | - / - | 10 | Partial capture |
| 11-03 02:42 | 80m | -5 / - | TK/DH7SB | - / - | 4 | Partial capture |
| 11-03 02:35 | 80m | -6 / - | TK/DH7SB | - / - | 4 | Partial capture |
| 11-03 02:02 | 80m | -11 / - | TK/DH7SB | - / - | 37 | Partial capture |
| 11-03 01:51 | 80m | -8 / - | 6W/IK2HKT | - / - | 20 | Partial capture |
| 11-03 01:39 | 80m | -4 / - | UA9XL/P | - / - | 18 | Partial capture |
| 11-03 01:34 | 80m | -4 / - | UA9XL/P | - / - | 3 | Partial capture |
| 11-03 01:27 | 80m | -3 / - | UA9XL/P | - / - | 6 | Partial capture |
| 11-03 01:23 | 80m | -12 / - | 6W/IK2HKT | - / - | 7 | Partial capture |
| 11-03 01:19 | 80m | -6 / - | DB100FT | - / - | 2 | Partial capture |
| 11-03 01:17 | 80m | -5 / - | 6W/IK2HKT | - / - | 4 | Partial capture |
| 11-03 01:08 | 80m | -4 / - | PC40EUDXF | - / - | 2 | Partial capture |
| 11-03 01:03 | 80m | -4 / - | UA9XL/P | - / - | 7 | Partial capture |
| 10-18 22:38 | 40m | - / -13 | EX7CQ | -4 / - | 2 | ✓ Closing fragment |
| 10-16 21:57 | 80m | -12 / - | <...> | - / +6 | 2 | Partial capture |
| 10-16 18:08 | 40m | - / -13 | EA1KCN | -5 / - | 4 | ✓ Closing fragment |
| 10-16 18:07 | 40m | - / -5 | ON60MWV | +6 / - | 5 | ✓ Closing fragment |
| 10-04 00:11 | 80m | -4 / - | NE5TX | - / - | 7 | Partial capture |
| 10-04 00:06 | 80m | -8 / -6 | RY3F | +2 / -4 | 4 | ✓ Full exchange observed |
| 10-04 00:04 | 80m | -2 / - | NE5TX | - / - | 2 | Partial capture |
| 10-04 00:00 | 80m | +2 / - | RK3YWS/P | - / - | 2 | Partial capture |
| 10-03 23:59 | 80m | +8 / - | UB0SMX/P | - / - | 3 | Partial capture |
| 10-03 23:53 | 80m | - / - | DH3MFW | -6 / - | 3 | ✓ Closing fragment |
| 09-17 19:23 | 60m | - / -14 | EA1IOK | -4 / - | 3 | ✓ Closing fragment |
| 09-17 19:22 | 60m | - / -4 | ON5RZ | -16 / - | 3 | ✓ Closing fragment |
| 09-17 19:21 | 60m | - / -12 | SN31ROT | -1 / - | 2 | Partial capture |
| 09-16 21:42 | 160m | -22 / - | RI1FJZ | - / -20 | 8 | Partial capture |
| 09-16 21:35 | 160m | -22 / - | RI1FJZ | - / - | 4 | Partial capture |
| 09-16 21:27 | 160m | -22 / - | RI1FJZ | - / - | 2 | Partial capture |
| 09-16 21:15 | 160m | -20 / - | RI1FJZ | - / - | 2 | Partial capture |
| 09-16 21:03 | 160m | -22 / - | RI1FJZ | - / - | 2 | Partial capture |
| 09-16 20:58 | 160m | - / - | SP9CSE | -4 / - | 2 | Partial capture |
| 09-15 23:07 | 80m | -4 / - | RI1FJZ | - / -11 | 15 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 213645 -19 1397 RI1FJZ SI4A JO69 (x2) 214130 -15 1058 SI4A DB100FT -10 214245 -20 1403 RI1FJZ SI4A JO69 (x8) 222515 -24 1170 DK80NDS SI4A JO69 (x2) 165230 -15 1401 SI4A OT4A -17 (x2)
UTC dB Audio Message 000445 +5 2753 SI4A DA6DNA JO62 000515 -3 2176 HI8ML SI4A JO69 000515 +1 2752 SI4A DA6DNA JO62 000545 -1 2176 HI8ML SI4A JO69 000545 +3 2753 SI4A DA6DNA JO62 000615 +3 2176 HI8ML SI4A JO69 000615 +10 2752 SI4A DA6DNA JO62 (x2) 000700 +10 2675 DA6DNA SI4A +02 000715 +8 2753 SI4A DA6DNA R-08 000730 +11 2676 DA6DNA SI4A RR73 000745 +8 2752 SI4A DA6DNA 73 000845 -9 2414 SI4A RD9U NO33 (x2) 001330 -10 2043 AB3HP SI4A JO69
UTC dB Audio Message 123300 -22 1594 SI4A CR7BUW R+12 (x2) 124200 +2 638 SI4A EA7EZ IM76 (x3)
UTC dB Audio Message 154045 -1 1647 SI4A HG8LXL R-09 154100 -14 1693 HG8LXL SI4A RR73 154115 -2 1647 SI4A HG8LXL 73 233215 -17 1773 SI4A RZ4FWA LO23 180715 +7 513 SI4A ON60MWV -05 (x3) 180815 -5 2987 SI4A EA1KCN IN53 (x2) 180915 +7 513 SI4A ON60MWV 73 180915 -6 2988 SI4A EA1KCN R-13 (x2) 181015 +6 513 SI4A ON60MWV RR73 223830 -5 1716 SI4A EX7CQ -13 (x2)
UTC dB Audio Message 201945 -20 2141 OJ0YL SI4A JO69 (x2) 202815 -17 1678 LX1JX SI4A JO69 202830 +5 2815 SI4A LX1JX -06 202845 -16 1678 LX1JX SI4A R-01 202900 +3 2815 SI4A LX1JX RR73 202915 -15 1677 LX1JX SI4A 73 192115 -1 1114 SI4A SN31ROT -12 (x2) 192215 -18 2285 SI4A ON5RZ JO21 (x3) 192315 -7 481 SI4A EA1IOK IN62 (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.
CW
No CW receptions recorded for this callsign in the last 30 days.
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