W4UM — 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 W4UM, decoded by SO8OO in southeastern Poland. 348 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 28 UTC dates in the available aggregate history. Observed between 2026-07-10 and 2026-11-03.
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 348 FT8 messages attributed to W4UM as the transmitting token by decoded message structure across 28 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (46%), followed by 60 m (30%) and 80 m (22%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (72%); the estimated median was -3 dB.
Overview
Bands
Last attributed message: 2026-11-03 23:53 UTC
Observed FT8 message patterns
- Attributed sample
- 348 messages
- Active dates
- 28 UTC dates
- Estimated median S/N
- -3 dB
- Estimated 10th-90th percentile
- -11 to +9 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 6, moderate (-15 to -9 dB) 91, strong (≥ -8 dB) 251.
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 W4UM 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 W4UM
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
- EL97 · 67 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,549 km (approx.)
- Last such locator decoded
- 2026-11-03 23:44 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 | W4UM S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 11-03 23:53 | 80m | - / - | G8OO | -16 / - | 9 | Partial capture |
| 11-03 23:53 | 80m | - / - | DC6MY | -4 / - | 2 | Partial capture |
| 11-03 23:51 | 80m | -2 / - | OH7MA | +15 / -7 | 6 | ✓ Closing observed |
| 11-03 23:51 | 80m | -5 / -5 | EW6FL | +7 / -10 | 5 | ✓ Full exchange observed |
| 11-03 23:43 | 80m | - / - | DK9WI | +2 / - | 2 | Partial capture |
| 11-03 23:42 | 80m | - / - | UX7UU | 0 / - | 6 | Partial capture |
| 11-03 23:41 | 80m | -12 / - | S55X | - / - | 8 | Partial capture |
| 11-03 00:40 | 40m | -6 / - | YO6BJG | - / -24 | 2 | ✓ Closing fragment |
| 11-03 00:37 | 40m | -4 / - | F6FDY | - / -10 | 2 | ✓ Closing fragment |
| 11-03 00:33 | 40m | -5 / - | HJ0JAP | - / -8 | 3 | ✓ Closing fragment |
| 11-02 00:03 | 60m | -10 / - | CU2DX | - / -1 | 2 | Partial capture |
| 10-30 01:26 | 60m | +4 / - | 6W/IK2HKT | - / +1 | 2 | Partial capture |
| 10-30 00:28 | 160m | - / +2 | OH0Z | -1 / - | 2 | ✓ Closing fragment |
| 10-30 00:28 | 160m | - / - | ON5UE | -8 / - | 6 | Partial capture |
| 10-29 00:49 | 60m | - / - | S57MPU | +2 / - | 4 | Partial capture |
| 10-29 00:47 | 60m | -4 / - | SP2EWQ | - / -10 | 2 | ✓ Closing fragment |
| 10-29 00:46 | 60m | -6 / -2 | G8OO | -6 / -6 | 8 | ✓ Full exchange observed |
| 10-29 00:45 | 60m | -5 / -7 | ER5DX | -8 / -11 | 5 | ✓ Full exchange observed |
| 10-27 22:31 | 60m | - / - | F5OYA/P | -18 / - | 20 | Partial capture |
| 10-27 22:24 | 60m | -8 / - | DL7FD | - / -13 | 2 | ✓ Closing fragment |
| 10-27 22:22 | 60m | -9 / - | N5PNZ | - / -13 | 2 | ✓ Closing fragment |
| 10-27 22:21 | 60m | - / - | SV3SFK | -5 / - | 3 | Partial capture |
| 10-27 22:20 | 60m | - / - | OH6FSO | -2 / - | 4 | Partial capture |
| 10-27 22:19 | 60m | -10 / +7 | OK1BN | -16 / -6 | 6 | ✓ Full exchange observed |
| 10-27 22:18 | 60m | -10 / -1 | DL1OBF | -9 / -5 | 3 | ✓ Full exchange observed |
| 10-27 22:17 | 60m | -10 / +3 | EA7L | -17 / -21 | 11 | ✓ Full exchange observed |
| 10-27 22:16 | 60m | -10 / - | DD3KF | -6 / -12 | 14 | ✓ Full exchange observed |
| 10-27 22:16 | 60m | -8 / -7 | SP3EPK | -17 / -3 | 5 | ✓ Full exchange observed |
| 10-27 22:16 | 60m | -10 / - | SP3CMA | - / -19 | 2 | ✓ Closing fragment |
| 10-27 22:15 | 60m | -10 / -3 | IW2CAK | +3 / -22 | 12 | ✓ Full exchange observed |
| 10-27 22:14 | 60m | -10 / - | DL1YEG | -12 / -19 | 4 | ✓ Closing observed |
| 10-26 22:11 | 60m | -5 / - | 7P8GE | - / -18 | 2 | Partial capture |
| 10-22 00:01 | 160m | - / -14 | DK7ZT | +8 / - | 5 | Partial capture |
| 10-21 23:33 | 60m | -9 / - | VU2NKS | - / -23 | 3 | Partial capture |
| 10-21 22:50 | 60m | -8 / - | EB3JT | -13 / -12 | 12 | ✓ Closing observed |
| 10-21 22:50 | 60m | -9 / -10 | IK1MNJ | +1 / -6 | 6 | ✓ Full exchange observed |
| 10-21 22:49 | 60m | -9 / - | SP5ES | - / -9 | 2 | ✓ Closing fragment |
| 10-21 22:42 | 60m | - / - | PA3GQM | -4 / - | 2 | Partial capture |
| 10-21 22:40 | 60m | - / - | IK2EST | -16 / - | 5 | Partial capture |
| 10-21 22:39 | 60m | - / - | DB3EH | +3 / - | 6 | Partial capture |
| 10-21 22:39 | 60m | -12 / -6 | PE1MHY | 0 / -10 | 5 | ✓ Full exchange observed |
| 10-21 22:36 | 60m | -11 / -8 | UD6AWH | -12 / -19 | 6 | ✓ Full exchange observed |
| 10-21 02:02 | 60m | +2 / -10 | RN3GG | -10 / -25 | 7 | ✓ Full exchange observed |
| 10-20 00:19 | 40m | -2 / - | ON8WR | -5 / -10 | 5 | ✓ Full exchange observed |
| 10-20 00:18 | 40m | -4 / -9 | JY5IB | -21 / - | 2 | ✓ Closing observed |
| 10-20 00:18 | 40m | - / - | SV1MOZ | -5 / - | 3 | Partial capture |
| 10-18 23:39 | 40m | -10 / - | KK5JY | - / -20 | 2 | ✓ Closing fragment |
| 10-18 23:36 | 40m | +1 / - | PD0DDA | - / -21 | 5 | Partial capture |
| 10-18 23:35 | 40m | +3 / -3 | A61DD | -10 / -12 | 5 | ✓ Full exchange observed |
| 10-18 23:34 | 40m | -1 / -10 | UN0GY | -6 / - | 5 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 235245 +8 1755 W4UM EW6FL 73 235300 -3 1295 OH7MA W4UM -07 235315 -3 631 W4UM DC6MY JN58 235330 -1 1295 OH7MA W4UM RR73 235345 +14 2320 W4UM OH7MA 73 235345 -13 1852 W4UM G8OO JO02 (x2) 235415 -5 634 W4UM DC6MY JN58 235445 -13 1852 W4UM G8OO JO02 (x7)
UTC dB Audio Message 002000 -4 2255 W4UM ON8WR R+12 002015 -1 417 ON8WR W4UM RR73 002030 -4 2254 W4UM ON8WR 73 003345 -10 2207 HJ0JAP W4UM EL97 (x3) 003515 -1 2571 IZ5OVP W4UM -13 003645 -2 2571 HB9TIH W4UM RR73 003715 -8 2571 F6FDY W4UM -10 (x2) 003845 -6 2571 PY4JCW W4UM -02 004015 -6 2571 YO6BJG W4UM -24 (x2) 004645 -1 2571 M7LYG W4UM -21 004715 -4 2571 YO6BJG W4UM RR73
UTC dB Audio Message 004830 -5 1549 G8OO W4UM -06 004845 -4 1840 W4UM G8OO R-02 004900 -7 1549 G8OO W4UM RR73 004915 -3 2600 W4UM S57MPU JN76 004915 -9 1840 W4UM G8OO 73 004945 +4 2601 W4UM S57MPU JN76 (x3) 012645 +2 607 6W/IK2HKT W4UM EL97 012815 +5 548 P4/WE9V W4UM EL97 012845 +6 548 <6W/IK2HKT> W4UM R+01 235915 -8 1233 C5R W4UM EL97 000315 -8 1512 CU2DX W4UM EL97 (x2) 000400 -5 379 W4UM RR73; OK1TRJ <...> +02
UTC dB Audio Message 224215 +13 944 W4UM PI4DX +02 (x2) 000130 +11 823 W4UM DK7ZT -14 (x5) 002815 -8 2840 W4UM ON5UE JO11 002815 -3 2366 W4UM OH0Z +02 (x2) 002915 -14 2840 W4UM ON5UE JO11 (x5)
UTC dB Audio Message 161015 -5 445 W4UM SV1MOZ KM17 (x2) 161100 -17 1831 W4UM SV1AMH KM18 (x2) 161145 -9 443 W4UM SV1MOZ R-24
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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