UT4XU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Ukraine Most frequent locator attributed to this token: KO40

Receiver-side FT8 activity involving UT4XU, decoded by SO8OO in southeastern Poland. 179 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-14.

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 179 FT8 messages attributed to UT4XU as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (58%), followed by 80 m (32%) and 20 m (7%). Several six-hour UTC windows tied for the largest share (61%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (83%); the estimated median was 0 dB.

Overview

179

Messages attributed

UTC dates decoded

Active 15-min windows

0 dB

Estimated median S/N

Bands

80m · 58 40m · 103 20m · 12 10m · 6

First attributed message: 2026-06-08
Last attributed message: 2026-09-14 18:09 UTC

Observed FT8 message patterns

Attributed sample: 179 messages
Active dates: 13 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -13 to +12 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 8, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 148.

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 UT4XU in decoded directed-looking exchanges:

CR7BRV · Portugal EG1PDA · Spain OE3ZIO · Austria CR5VP · Portugal EU4U · Belarus LY3VD · Lithuania SP7WMI · Poland YO3ANS · Romania EH3ST · Spain

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 UT4XU

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: KO40 · 141 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 516 km (approx.)
Last such locator decoded: 2026-09-14 18:08 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	UT4XU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-14 18:04	80m	+10 / -14	EH3ST	-18 / -10	11	✓ Full exchange observed
09-14 06:41	40m	-9 / -	EH3ST	- / -	5	Partial capture
09-12 06:40	40m	- / -7	YO3ANS	-8 / -	4	✓ Closing fragment
09-12 06:39	40m	-6 / -7	EU4U	+6 / -14	4	✓ Full exchange observed
09-07 12:57	10m	- / -13	CR7BRV	+13 / -	2	✓ Closing fragment
09-04 08:31	40m	-1 / -	<...>	- / -13	5	Partial capture
09-04 07:32	40m	0 / -	LY3VD	- / -10	2	✓ Closing fragment
09-04 07:29	40m	-1 / -	3Z100PKP	- / -10	3	Partial capture
09-04 07:25	40m	+5 / -	AM42SDC	- / -	6	Partial capture
09-04 06:44	40m	+13 / -	SN100PKP	- / -	2	Partial capture
09-04 06:39	40m	+12 / -	<...>	- / -	13	Partial capture
09-04 06:10	40m	+8 / -	SP100PKP	-4 / -2	4	Partial capture
09-04 06:07	40m	+6 / -	SQ100PKP	- / -2	2	Partial capture
09-03 19:11	80m	+8 / -	SQ100PKP	- / -2	4	Partial capture
09-03 17:57	80m	+16 / +10	SQ100PKP	+9 / -4	3	Partial capture
09-03 08:31	40m	-4 / -	HF100PKP	- / -10	10	Partial capture
09-03 08:29	40m	-2 / -	<...>	- / -	3	Partial capture
09-03 07:49	40m	+2 / -	<...>	- / -	2	Partial capture
09-03 07:46	40m	0 / -	OH2CUB/P	- / -	4	Partial capture
09-03 07:45	40m	+3 / -	HF100PKP	- / -	3	Partial capture
09-03 06:30	40m	-6 / -	3Z100PKP	- / +2	2	Partial capture
09-03 06:29	40m	+4 / -	<...>	- / -	2	Partial capture
09-02 17:09	40m	+3 / -	<...>	- / +1	3	Partial capture
09-02 09:46	40m	-6 / -	SP100PKP	-2 / 0	3	Partial capture
09-02 08:24	40m	0 / -	<...>	- / -6	3	Partial capture
09-01 10:00	40m	-4 / -	<...>	- / -4	2	Partial capture
09-01 09:57	40m	-7 / -	HF100PKP	- / -	2	Partial capture
09-01 09:01	40m	+10 / -8	SQ100PKP	-8 / -	3	Partial capture
09-01 08:56	40m	+5 / -	<...>	- / -	9	Partial capture
08-31 18:43	80m	-6 / -	VK4DAD	- / -	8	Partial capture
08-31 18:02	80m	0 / -	EY8BL	- / -	2	Partial capture
08-31 17:58	80m	0 / -	<...>	- / -12	2	Partial capture
08-31 14:51	20m	- / -	F5IXN	+4 / -	2	Partial capture
08-27 20:40	80m	-12 / -	RI1FJL	- / -	2	Partial capture
08-27 19:52	80m	-11 / -	RI1FJL	- / -	10	Partial capture
08-27 19:30	80m	-3 / -	RI1FJL	- / -	5	Partial capture
08-27 19:23	80m	-16 / -	RI1FJL	- / -	5	Partial capture
08-27 19:19	80m	-6 / -	RI1FJL	- / -	3	Partial capture
08-27 19:10	80m	-2 / -6	EN35UKR	-4 / +2	3	Partial capture
08-22 06:35	20m	-10 / -	<...>	- / -	2	Partial capture
08-21 06:41	20m	+21 / -	<...>	- / -	2	Partial capture
08-21 06:36	20m	+10 / +8	II7MGML	-3 / -7	8	Partial capture
08-04 06:05	40m	-13 / -	<...>	- / -	4	Partial capture
07-08 15:44	10m	- / -8	OE3ZIO	-18 / -	4	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
191215  +8 1977  SQ100PKP UT4XU R-02 (x3)
191330 +11 1977  UT4XU RR73; 9A5TW <...> -06
180415 +14  822  EH3ST UT4XU KO40 (x7)
180900 -16 1554  UT4XU EH3ST -14
180915 +12 1554  EH3ST UT4XU R-10
180930 -21 1554  UT4XU EH3ST RR73
180945 +11 1554  EH3ST UT4XU 73

40m

UTC    dB Audio  Message
083245  -1 1735  <...> UT4XU R-13 (x2)
063945  +6 2667  UT4XU EU4U -07
064000  -6 2667  EU4U UT4XU R-14
064015  +5 2667  UT4XU EU4U RR73
064030  -6 2667  EU4U UT4XU 73
064045  -1 2668  UT4XU YO3ANS KN34 (x4)
064115  -9 1906  EH3ST UT4XU KO40 (x5)

10m

UTC    dB Audio  Message
092130  -4  880  UT4XU 9A60CBM +08
154445 -15 2164  UT4XU OE3ZIO JN78 (x4)
125700 +14  608  UT4XU CR7BRV -13 (x2)
125930 -12 1171  UT4XU EG1PDA RR73

20m

UTC    dB Audio  Message
063615 +13 1067  II7MGML UT4XU KO40
063630  -3 1066  UT4XU II7MGML +08
063715 +16 1067  II7MGML UT4XU R-07 (x6)
064115 +17 2610  <...> UT4XU KO40 (x4)
145015 -10 1625  UT4XU IK2BUF -19
145145  +5 2532  UT4XU F5IXN JN23 (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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