S51RU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Slovenia Most frequent locator attributed to this token: JN76

Receiver-side FT8 activity involving S51RU, decoded by SO8OO in southeastern Poland. 490 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 49 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-21.

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 490 FT8 messages attributed to S51RU as the transmitting token by decoded message structure across 49 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (43%), followed by 40 m (22%) and 80 m (19%). Several six-hour UTC windows tied for the largest share (81%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (61%); the estimated median was -6 dB.

Overview

490

Messages attributed

UTC dates decoded

101

Active 15-min windows

-6 dB

Estimated median S/N

Bands

160m · 4 80m · 94 60m · 62 40m · 109 20m · 209 10m · 12

First attributed message: 2026-06-07
Last attributed message: 2026-09-21 04:34 UTC

Observed FT8 message patterns

Attributed sample: 490 messages
Active dates: 49 UTC dates
Estimated median S/N: -6 dB
Estimated 10th-90th percentile: -17 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 75, moderate (-15 to -9 dB) 115, strong (≥ -8 dB) 300.

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 S51RU in decoded directed-looking exchanges:

CE2SV · Chile OK1DXR · Czech Republic OK1TP · Czech Republic DK1STE · Fed. Rep. of Germany F4BJN · France K3EA · United States K5CM · United States K7CTV · United States K8OM · United States KA3E · United States KE4EB · United States KF0WAP · United States

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 S51RU

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: JN76 · 319 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 631 km (approx.)
Last such locator decoded: 2026-09-21 04:34 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	S51RU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 04:34	60m	-8 / -18	VE3FF	-16 / -	4	Partial capture
09-20 04:19	80m	-6 / -	SN40KZE	- / -6	2	Partial capture
09-18 04:06	80m	+2 / -	3Z100PKP	- / -1	4	Partial capture
09-18 04:04	80m	+2 / -	HF100PKP	- / -	3	Partial capture
09-17 12:22	40m	-6 / -	II7IABB	- / -2	2	Partial capture
09-17 04:23	80m	+3 / -	HF100PKP	- / -6	2	Partial capture
09-17 04:13	80m	-4 / -	II6IALU	- / -8	2	Partial capture
09-17 03:59	80m	+3 / -	II6IALU	- / -	2	Partial capture
09-17 03:58	80m	+2 / +9	SO100PKP	+9 / -	6	Partial capture
09-16 12:18	40m	-14 / +2	DL6EL	-9 / +4	5	✓ Full exchange observed
09-16 12:16	40m	-18 / -	SP9DPM/P	- / -16	2	Partial capture
09-16 08:20	40m	- / -	DL2HUC	-8 / -	3	Partial capture
09-16 08:19	40m	- / -	DL6EL	-10 / -	3	Partial capture
09-16 08:19	40m	-7 / +8	IK4TVP	-21 / -14	4	✓ Full exchange observed
09-15 06:16	40m	-2 / -	HF100PKP	- / -17	5	Partial capture
09-15 06:14	40m	+1 / -	IT9/IZ6FXP	- / -14	3	Partial capture
09-15 04:53	40m	-8 / -	VP5/K5UR	- / -10	2	Partial capture
09-14 18:00	80m	+9 / -	UB0SMX/P	- / -	3	Partial capture
09-13 04:02	80m	- / -	YO3GNF	-9 / -	4	Partial capture
09-13 04:01	80m	- / -	LZ2VQ	-12 / -	3	Partial capture
09-13 04:00	80m	+9 / 0	SO100PKP	-6 / -17	3	Partial capture
09-13 03:55	80m	- / -4	SO100PKP	-6 / -	2	Partial capture
09-13 03:55	80m	+10 / -	3Z100PKP	- / -7	7	Partial capture
09-13 03:50	160m	-19 / -	OK1DXR	+6 / +6	3	✓ Closing observed
09-13 03:49	160m	-19 / -15	OK1TP	+8 / -1	5	✓ Full exchange observed
09-13 03:43	80m	+4 / -	3Z100PKP	- / -	6	Partial capture
09-13 03:42	80m	-5 / -13	G8OO	-5 / -10	5	✓ Full exchange observed
09-13 03:40	80m	+4 / -	R4AGE/P	- / -3	3	Partial capture
09-12 13:23	40m	-3 / -	RT4A/P	- / -12	8	Partial capture
09-12 13:23	40m	- / +1	HF100PKP	-8 / -	2	Partial capture
09-12 03:51	60m	- / -8	F4LTX	-16 / -	2	Partial capture
09-12 03:50	60m	- / -10	PA4PA	+12 / -	2	✓ Closing fragment
09-11 15:45	40m	+3 / -	R5BM/M	- / -3	2	Partial capture
09-11 15:39	40m	+1 / -	R5BM/M	- / -	6	Partial capture
09-11 06:15	80m	-5 / -2	F5RRS	-3 / +2	5	✓ Full exchange observed
09-11 06:13	80m	-2 / -	II4PAGE	- / -8	2	Partial capture
09-11 05:08	40m	-8 / -	W9MHD	- / -	2	Partial capture
09-08 04:32	40m	-4 / -	KS4OT	- / -	2	Partial capture
09-08 04:13	40m	-8 / -	AA1HR	- / -18	10	Partial capture
09-07 03:52	80m	+10 / -	SQ100PKP	- / +1	2	Partial capture
09-02 03:23	80m	- / -	LZ2VQ	-12 / -	2	Partial capture
09-02 03:20	80m	+3 / +7	SO100PKP	+2 / -15	6	Partial capture
09-01 02:58	60m	-11 / -	F5OYA/P	- / -	2	Partial capture
09-01 02:58	80m	- / -	EA5HM	-8 / -	2	Partial capture
09-01 02:56	80m	+6 / -11	SV9QWC	-6 / -19	3	Partial capture
08-29 04:39	40m	-7 / -5	F6FHZ	-24 / -25	5	✓ Full exchange observed
08-29 04:37	40m	-3 / -8	F4IIX	-5 / -	6	✓ Closing observed
08-29 04:34	40m	-11 / -9	KB2KBC	-19 / -	3	✓ Closing observed
08-29 04:32	40m	-2 / -	KO4PRE	- / -	2	Partial capture
08-29 04:30	40m	-8 / -	KB2KBC	- / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
043900  -9 2005  <...> S51RU JN76
043915  -8 1604  S51RU SN40KZE -11
043930  -7 2005  <...> S51RU R-10
025830  -8 2101  F5OYA/P S51RU JN76 (x2)
035000 +11  282  S51RU PA4PA -10 (x2)
035130 -16 1093  S51RU F4LTX IN95 (x2)
040815 -21 2062  W1IE S51RU JN76
041130 -11 1063  S51RU K1QD -17
043400  -8 2003  VE3FF S51RU JN76 (x2)
043545 -17 2004  S51RU VE3FF -18 (x2)

80m

UTC    dB Audio  Message
042430 +17 2165  S51RU RD9M/3 +05
042445  +1 1773  HF100PKP S51RU R-06
042500 +17 2165  S51RU RR73; SP5KG <...> +18
040445  +1 1773  HF100PKP S51RU JN76 (x3)
040615  -1 1773  <3Z100PKP> S51RU JN76 (x4)
041945  -6 1974  SN40KZE S51RU JN76
042000  +8 1184  S51RU HF100PKP +14
042015  -6 1974  SN40KZE S51RU R-06
042200  -4 1704  S51RU SN100PKP -16
042215  +1 1974  HF100PKP S51RU R-16

40m

UTC    dB Audio  Message
082100  -5 2059  S51RU DL2HUC JO51 (x2)
121645 -17 2106  SP9DPM/P S51RU JN76 (x2)
121800 -13  594  S51RU DL6EL JN57
121815 -17 2106  DL6EL S51RU +04
121830  -8  594  S51RU DL6EL R+02
121845 -12 2106  DL6EL S51RU RR73
121900  -6  594  S51RU DL6EL 73
121715 -16 2038  S51RU II4IANT -02
121845  -7 2107  II8IHBC S51RU JN76
122000  -1 2421  S51RU RR73; OE5ABL <...> -02
122215  -9 2006  II7IABB S51RU JN76 (x2)
122300  -1 2117  S51RU RR73; IU4QQE <...> -14

160m

UTC    dB Audio  Message
034930 -20 1967  OK1TP S51RU JN76
034945  +7 1822  S51RU OK1TP -15
035000 -18 1967  OK1TP S51RU R-01
035015  +9 1822  S51RU OK1TP RR73
035030 -20 1967  OK1TP S51RU 73
035045  +7 1296  S51RU OK1DXR JO60
035100 -19 1967  OK1DXR S51RU +06
035145  +5 1295  S51RU OK1DXR 73

20m

UTC    dB Audio  Message
104245 -14 2038  R50RKZ S51RU R-04
104300  -9  927  S51RU R50RKZ RR73
035130 -19 2037  NE9U S51RU JN76 (x7)
035500  +7 1036  AA4SS S51RU JN76
035530  +8 1036  NE9U S51RU R-10 (x2)
035915  -2 1036  K0ARM S51RU JN76 (x3)

10m

UTC    dB Audio  Message
195330 -10  723  S51RU SX0W KN10 (x3)
163300 -14 2042  CE2SV S51RU JN76 (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.

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