UR4UM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Ukraine Most frequent locator attributed to this token: KO50

Receiver-side FT8 activity involving UR4UM, decoded by SO8OO in southeastern Poland. 184 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 23 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-12.

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 184 FT8 messages attributed to UR4UM as the transmitting token by decoded message structure across 23 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (35%), followed by 80 m (33%) and 10 m (21%). Several six-hour UTC windows tied for the largest share (46%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

184
Messages attributed
23
UTC dates decoded
38
Active 15-min windows
-9 dB
Estimated median S/N

Bands

80m · 61 40m · 20 20m · 64 10m · 39
First attributed message: 2026-06-06
Last attributed message: 2026-09-12 18:32 UTC

Observed FT8 message patterns

Attributed sample
184 messages
Active dates
23 UTC dates
Estimated median S/N
-9 dB
Estimated 10th-90th percentile
-22 to +3 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 61, moderate (-15 to -9 dB) 36, strong (≥ -8 dB) 87.

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 UR4UM 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 UR4UM

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
KO50 · 45 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
658 km (approx.)
Last such locator decoded
2026-09-09 18:11 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 UTCBandUR4UM S/NCounterpartCounterpart S/NMsgsCapture
09-12 18:28 40m 0 / - UB3ADO/P - / -9 4 Partial capture
09-09 18:15 80m -2 / -3 UR4LRG +3 / +9 5 ✓ Full exchange observed
09-09 18:13 80m -8 / -15 OE3ZIO -3 / - 3 ✓ Closing observed
09-09 18:12 80m -11 / -13 YT2ZE -10 / -9 3 ✓ Full exchange observed
08-29 08:05 20m -2 / - BG0FQU - / -16 2 ✓ Closing fragment
08-29 08:03 20m 0 / - A61OK - / -14 4 Partial capture
08-27 16:27 20m -16 / -16 G4UJS -4 / - 3 ✓ Closing observed
08-27 15:57 20m - / -13 BA3NZ -14 / - 2 ✓ Closing fragment
08-27 15:54 20m - / -13 BH4ECL -8 / - 2 Partial capture
08-27 15:49 20m - / -15 JA5SLV -8 / - 2 ✓ Closing fragment
08-23 06:01 20m - / -24 <...> 0 / - 2 Partial capture
08-23 05:49 20m - / +5 F4HQL -8 / - 2 Partial capture
08-23 05:44 20m - / -13 TA2ZLM -5 / - 8 ✓ Closing fragment
08-23 05:41 20m - / -13 F5SZB 0 / - 5 ✓ Closing fragment
08-23 05:37 20m - / -11 R4FDW -5 / - 5 Partial capture
08-23 05:34 20m - / -11 R4FDW -10 / - 2 Partial capture
08-20 15:14 10m -8 / - <...> - / -16 7 Partial capture
08-20 15:12 10m -10 / - YG2ACZ - / - 2 ✓ Closing fragment
08-20 15:10 10m -8 / - <...> - / -14 3 Partial capture
08-20 15:09 10m -9 / - YG2ACZ - / -16 2 Partial capture
08-20 05:44 20m - / - R4HLO -17 / - 2 Partial capture
08-19 05:52 40m -18 / - T77RN - / -10 3 ✓ Closing fragment
08-19 05:50 40m -18 / -5 DL9KM -13 / 0 5 ✓ Full exchange observed
08-19 05:46 40m -20 / - 9A4BP/P - / -10 2 Partial capture
08-10 04:42 20m - / - RX3ASQ -20 / - 2 Partial capture
08-06 09:42 20m - / - UA4FKT -17 / - 3 Partial capture
08-04 15:39 20m - / - RX3ASQ -16 / - 2 Partial capture
08-04 15:37 20m -21 / -21 UT7UJ -14 / -11 4 ✓ Full exchange observed
08-04 15:32 20m -20 / - VU37NM - / -8 2 Partial capture
08-03 06:39 20m - / - RX3ASQ -16 / - 4 Partial capture
08-03 06:32 20m - / - RX3ASQ -10 / - 2 Partial capture
08-03 06:21 20m - / -20 RX3ASQ -17 / - 4 Partial capture
08-01 19:27 20m - / -16 PD3LKN 0 / - 8 ✓ Closing fragment
08-01 19:25 20m - / -8 I4HRH -12 / - 2 Partial capture
07-29 19:30 20m - / -17 IU5LAD -10 / - 2 ✓ Closing fragment
07-29 19:21 20m - / -9 CN2DX -9 / - 2 Partial capture
07-27 20:48 80m -12 / - OE5BUC - / -9 2 Partial capture
07-27 20:47 80m -10 / -21 DA6YY -3 / -14 5 ✓ Full exchange observed
07-27 20:46 80m -2 / -6 DL3AS +6 / +1 4 ✓ Full exchange observed
07-27 20:42 80m -5 / - IV3IHV - / -5 3 ✓ Closing fragment
07-27 20:35 80m -4 / - ON5JDB -2 / -14 5 ✓ Closing observed
07-27 20:32 80m -2 / - OE9RWH/7 - / -5 3 Partial capture
07-27 20:31 80m -6 / -12 PA4CC +12 / -3 4 ✓ Full exchange observed
07-26 20:00 20m -13 / -16 TA2ED -3 / -2 7 Partial capture
07-25 06:47 10m - / +10 DH1GKS -4 / - 3 ✓ Closing fragment
07-23 06:39 10m +2 / - SP3AVS - / -12 2 ✓ Closing fragment
07-23 06:20 20m -12 / -7 ON3BEN -23 / -16 4 ✓ Full exchange observed
07-23 06:19 20m -13 / - ES6RMR - / -3 2 ✓ Closing fragment
07-19 21:12 80m -1 / -3 OL900LTV -2 / -11 3 Partial capture
07-19 21:10 80m +6 / -16 GM2OT -14 / -14 5 ✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

40m 
UTC    dB Audio  Message
055115 -13 2166  UR4UM DL9KM R-05
055215 -16 1281  T77RN UR4UM -10
055300 -20 1281  DL9KM UR4UM RR73
055345 -19 1281  T77RN UR4UM RR73 (x2)
055645 -15 1281  CQ UR4UM KO50 (x5)
060045 -21 1281  SP5DUJ UR4UM RR73
182845  +1  745  UB3ADO/P UR4UM -09 (x4)
80m 
UTC    dB Audio  Message
180745  -5 1519  YO9XC UR4UM +05
181030  -7 2008  CQ UR4UM KO50 (x3)
181215 -11 1616  YT2ZE UR4UM -09
181230 -10 1663  UR4UM YT2ZE R-13 (x2)
181330  -3 1119  UR4UM OE3ZIO R-15
181345  -8 1728  OE3ZIO UR4UM RR73
181400  -3 1119  UR4UM OE3ZIO 73
181545  +4  344  UR4UM UR4LRG R-03
181600  +0 2010  UR4LRG UR4UM +09
181615  +3  343  UR4UM UR4LRG R-02
181630  -3 2011  UR4LRG UR4UM RR73
181645  +1  344  UR4UM UR4LRG 73
20m 
UTC    dB Audio  Message
155800 -13  855  UR4UM BA3NZ 73
162630 -17 1889  CQ UR4UM KO50 (x3)
162745  -4 1888  UR4UM G4UJS -16 (x2)
162830 -16 1889  G4UJS UR4UM 73
162900 -17 1888  CQ UR4UM KO50
080145  -1 2427  UN7IV UR4UM RR73
080300  +0 2426  A61OK UR4UM -14 (x4)
080545  -6 2421  BG0FQU UR4UM -16 (x2)
10m 
UTC    dB Audio  Message
132600  +3 1056  UR4UM IU2EBR 73
150930  -9 1663  YG2ACZ UR4UM -16 (x2)
151045  -8 1706  <...> UR4UM -14 (x3)
151230  -9 1707  YG2ACZ UR4UM RR73 (x2)
151445  -7 2050  <...> UR4UM -16 (x7)

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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