YO4KMU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Romania Most frequent locator attributed to this token: KN44

Receiver-side FT8 activity involving YO4KMU, decoded by SO8OO in southeastern Poland. 1,910 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-08-06 and 2026-08-29.

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 1,910 FT8 messages attributed to YO4KMU as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (52%), followed by 40 m (45%) and 20 m (3%). Most decodes (56%) fell within the six-hour window 21:00-03:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (85%); the estimated median was -2 dB.

Overview

1,910

Messages attributed

UTC dates decoded

Active 15-min windows

-2 dB

Estimated median S/N

Bands

80m · 1,002 40m · 859 20m · 49

First attributed message: 2026-08-06
Last attributed message: 2026-08-29 04:33 UTC

Observed FT8 message patterns

Attributed sample: 1,910 messages
Active dates: 10 UTC dates
Estimated median S/N: -2 dB
Estimated 10th-90th percentile: -10.2 to +7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 57, moderate (-15 to -9 dB) 229, strong (≥ -8 dB) 1,624.

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 YO4KMU in decoded directed-looking exchanges:

SP5KG · Poland ×3 VA3VV · Canada ×2 DO9BAU · Fed. Rep. of Germany ×2 YL3CW · Latvia ×2 R7DX · European Russia ×2 HF5A · Poland ×2 DK7ZT · Fed. Rep. of Germany ×2 UA4FKT · European Russia ×2 LZ2VQ · Bulgaria ×2 RK4CH · European Russia ×2 YO4LUP · Romania ×2 M0PPT · England ×2

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 YO4KMU

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: KN44 · 1,223 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 813 km (approx.)
Last such locator decoded: 2026-08-29 04:33 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	YO4KMU S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-29 04:33	40m	- / -	F4IIX	-8 / -	4	Partial capture
08-29 04:32	40m	+12 / -	W2HYW	- / -16	2	Partial capture
08-29 04:29	40m	+11 / -	F1MXE	-5 / -15	4	Partial capture
08-29 04:26	40m	+3 / -7	YO9CSM	+2 / -23	11	✓ Full exchange observed
08-29 04:22	40m	+2 / -	HF5A	- / -6	2	✓ Closing fragment
08-29 04:20	40m	0 / -	XE1PM	- / -	3	Partial capture
08-29 04:17	40m	+4 / -	S58MU	- / +9	3	✓ Closing fragment
08-29 04:14	40m	- / -	F4IIX	-11 / -	2	Partial capture
08-29 04:14	40m	+7 / -	XE1PM	- / -	2	Partial capture
08-29 04:12	40m	+6 / -	RZ4FWA	- / -6	2	✓ Closing fragment
08-29 04:11	40m	-4 / -	SQ2BXI	- / -3	2	✓ Closing fragment
08-29 04:03	40m	-1 / -	PV8AJ	- / -8	3	✓ Closing fragment
08-29 04:01	40m	-2 / -13	3G1DX	-14 / -11	6	✓ Full exchange observed
08-29 03:57	40m	-3 / -	OH7BDI	- / -12	3	✓ Closing fragment
08-29 03:56	40m	-4 / -	SP5KG	- / +5	4	✓ Closing fragment
08-29 03:52	40m	+4 / -	K2PB	- / -10	2	✓ Closing fragment
08-29 03:49	40m	-12 / -	RW9AD	- / -	2	✓ Closing fragment
08-29 03:43	40m	- / -1	UA6LIK	-12 / -	3	✓ Closing fragment
08-29 03:42	40m	- / -	RJ2T	-6 / -	2	Partial capture
08-29 03:36	40m	- / -1	IZ5FSO	0 / -	2	Partial capture
08-29 03:35	40m	- / -13	MI0OBC	+2 / -	2	Partial capture
08-29 03:31	40m	- / -1	UT2AU	-14 / -	3	✓ Closing fragment
08-29 03:13	40m	- / +1	G1SCT	-2 / -	3	✓ Closing fragment
08-29 03:03	40m	- / -22	RA9SVO	-22 / -	2	✓ Closing fragment
08-29 02:55	40m	- / -4	G1SCT	+1 / -	3	Partial capture
08-29 02:49	40m	- / -11	UA9SAV	-17 / -	3	✓ Closing fragment
08-29 02:39	40m	- / -2	RD4CBG	+4 / -	3	✓ Closing fragment
08-29 02:34	40m	- / -11	DL8TV	+6 / -	3	✓ Closing fragment
08-29 02:31	40m	- / -8	EA3AKY	-6 / -	3	✓ Closing fragment
08-29 02:23	40m	- / -3	R3LDK	-13 / -	3	✓ Closing fragment
08-29 02:16	40m	-16 / 0	RV6MX	0 / +5	4	✓ Full exchange observed
08-29 02:14	40m	+2 / -	R9BT	- / -12	2	Partial capture
08-29 02:04	40m	- / -3	RX9ABI	-9 / -	2	✓ Closing fragment
08-29 02:01	40m	- / -20	AF4CD	-16 / -	5	✓ Closing fragment
08-29 01:26	40m	-16 / -17	HK3PSA	-17 / -	3	✓ Closing observed
08-29 01:20	40m	-8 / -3	RK4CH	-9 / 0	5	✓ Full exchange observed
08-29 01:15	40m	-10 / -	UK2IPI	- / -19	2	Partial capture
08-29 01:08	40m	-1 / -	VA3VV	- / -	2	✓ Closing fragment
08-29 01:01	40m	-1 / -	DL5CTE	-4 / -19	3	Partial capture
08-29 00:56	40m	0 / -	VA3VV	- / -20	7	✓ Closing fragment
08-29 00:53	40m	0 / -	W4CHA	-13 / -4	3	✓ Closing observed
08-29 00:52	40m	+2 / -	PE1OBL	- / -13	2	✓ Closing fragment
08-29 00:50	40m	+3 / -	KD2WBX	- / -19	3	Partial capture
08-29 00:44	40m	+3 / -12	RZ6AKF	+4 / -	4	✓ Full exchange observed
08-29 00:39	40m	+3 / -	R9OON	- / -17	2	✓ Closing fragment
08-29 00:36	40m	0 / -	2E0MWY	- / -15	2	✓ Closing fragment
08-29 00:30	40m	-1 / -5	RX9WM	-1 / -8	5	✓ Full exchange observed
08-29 00:27	40m	-1 / -	OD5ZZ	- / -7	2	✓ Closing fragment
08-29 00:18	40m	0 / -	VA3ZK	- / -17	8	✓ Closing fragment
08-29 00:10	40m	-2 / -1	GE0KUC	-13 / -4	4	✓ 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
042945  +1 2586  YO4KMU YO9CSM KN23
042945  -1  955  YO4KMU F1MXE JN05
043000  +2  955  YO9CSM YO4KMU -07
043015  +5 2586  YO4KMU YO9CSM R-04
043015  -7  955  YO4KMU F1MXE JN05
043030  +4  954  YO9CSM YO4KMU RR73
043130 +11  954  F1MXE YO4KMU -15
043200 +11  955  W2HYW YO4KMU -16 (x2)
043300 +11  954  CQ YO4KMU KN44
043315  -2  688  YO4KMU F4IIX IN95
043330 +10  955  CQ YO4KMU KN44
043415 -13  688  YO4KMU F4IIX IN95 (x3)

10m

UTC    dB Audio  Message
093715 -11  582  YO4KMU HB9XBY JN47 (x4)
094215  -1 2635  YO4KMU F1PBZ -13 (x2)
105230 -14 2008  YO4KMU DO1DPL 73

80m

UTC    dB Audio  Message
042045 -10 1288  YO4KMU SV1DBY KM18
042100  -8 1816  SV1DBY YO4KMU +02
042115 -10 1287  YO4KMU SV1DBY R-05
042130 -10 1815  SV1DBY YO4KMU RR73
042145 -13 1287  YO4KMU SV1DBY 73
042200 -10 1815  CQ YO4KMU KN44 (x10)

20m

UTC    dB Audio  Message
151930 -12 1470  YO4KMU MW7RHR RR73
151945 -10 1979  MW7RHR YO4KMU 73
152015 -14 1979  ON4AOI YO4KMU KN44
152030  +7  605  YO4KMU ON4AOI -11
152045 -10 1979  ON4AOI YO4KMU R-10
152100  +3  604  YO4KMU ON4AOI RR73
152115  -6 1979  ON4AOI YO4KMU 73
152145 -14 1979  RA0SCA YO4KMU KN44
152200  -9 1030  YO4KMU RA0SCA -08
152215 -15 1979  RA0SCA YO4KMU R-13 (x2)
152315 -16 1979  DK7ZT YO4KMU R-19
153830 -16 1978  OK2PM YO4KMU KN44
154000 -16 2129  K0HB YO4KMU KN44 (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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