JL1RUC — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM95

Receiver-side FT8 activity involving JL1RUC, decoded by SO8OO in southeastern Poland. 82 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 8 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 82 FT8 messages attributed to JL1RUC as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (76%), followed by 40 m (24%). Several six-hour UTC windows tied for the largest share (80%), 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

Messages attributed

UTC dates decoded

Active 15-min windows

-9 dB

Estimated median S/N

Bands

40m · 20 20m · 62

First attributed message: 2026-06-06
Last attributed message: 2026-09-12 18:43 UTC

Observed FT8 message patterns

Attributed sample: 82 messages
Active dates: 8 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -17 to +1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 19, moderate (-15 to -9 dB) 26, strong (≥ -8 dB) 37.

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 JL1RUC in decoded directed-looking exchanges:

EU4U · Belarus ×2 CU2AP · Azores EX7CQ · Kyrgyzstan 7X5CY · Algeria BA4UFM · China BH4ECL · China DL8TV · Fed. Rep. of Germany EP2AES · Iran K4RUM · United States LY4AA · Lithuania OK2CNI · Czech Republic R3BDQ · European Russia

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 JL1RUC

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: PM95 · 28 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,693 km (approx.)
Last such locator decoded: 2026-08-25 13:58 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	JL1RUC S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-12 18:45	40m	- / -	YO9BNP	-10 / -	2	Partial capture
09-12 18:41	40m	-10 / -11	EU4U	+7 / -	3	✓ Closing observed
09-12 18:36	40m	-7 / -	EW2ZC	- / -12	3	Partial capture
09-12 18:29	40m	- / -25	EW2ZC	+1 / -	3	Partial capture
09-12 18:25	40m	- / -	UB6OCP	-8 / -	2	Partial capture
09-12 18:24	40m	- / -15	EW4DX	+9 / -	2	✓ Closing fragment
08-28 11:01	10m	- / -12	CU2AP	-22 / -	2	✓ Closing fragment
08-28 10:48	10m	- / -	CU2AP	-12 / -	3	Partial capture
08-27 12:03	20m	- / -	RW6HPS	-3 / -	5	Partial capture
08-26 12:53	20m	- / -20	F1ODM	+3 / -	3	Partial capture
08-26 12:51	20m	- / -	F6GGA	-1 / -	2	Partial capture
08-26 12:51	20m	- / -11	PD2WL	0 / -	8	Partial capture
08-26 12:24	20m	- / -13	ON1DGN	-20 / -	3	Partial capture
08-26 12:24	20m	- / -	RZ4FWA	-2 / -	2	Partial capture
08-26 12:11	20m	- / -16	PD2WL	+4 / -	4	Partial capture
08-26 11:55	20m	- / -8	R4FDW	-7 / -	5	Partial capture
08-26 10:12	20m	- / +1	K4RUM	-7 / -	3	✓ Closing fragment
08-25 20:41	40m	-18 / -13	SQ5NAN	+14 / -11	3	✓ Full exchange observed
08-25 20:37	40m	-19 / +3	LZ1GC	+9 / -6	5	✓ Full exchange observed
08-25 20:34	40m	-20 / -	I2/DK6MAX	- / -16	2	Partial capture
08-25 20:26	40m	- / -17	RL3K	0 / -	4	Partial capture
08-25 20:25	40m	- / -11	IV3FSG	+16 / -	2	✓ Closing fragment
08-25 20:22	40m	-17 / -	9A4ZM	- / -15	3	Partial capture
08-25 20:21	40m	- / -	PA3KUS	-15 / -	3	Partial capture
08-25 20:20	40m	-16 / -8	R3KON	+10 / -11	6	✓ Full exchange observed
08-25 20:19	40m	- / -	SP9BGL	+8 / -	3	Partial capture
08-25 20:18	40m	- / -	PA3KUS	-19 / -	2	Partial capture
08-25 20:18	40m	-15 / -16	SM0IJS	-10 / -14	4	✓ Full exchange observed
08-25 20:18	40m	- / -	OT1V	0 / -	10	Partial capture
08-25 20:16	40m	-17 / -18	R6KX	+2 / -7	11	✓ Full exchange observed
08-25 20:16	40m	-15 / -7	UA4FKT	+4 / -	5	✓ Closing observed
08-25 20:15	40m	-13 / -11	IZ5IMD	+10 / -5	7	Partial capture
08-25 14:29	20m	-7 / -	EP2AES	-19 / -15	5	✓ Closing observed
08-25 14:25	20m	- / -	RA4AG	+2 / -	2	✓ Closing fragment
08-25 14:24	20m	- / -	F4HUN	+2 / -	2	Partial capture
08-25 14:22	20m	-9 / -20	SV9/PD9VOG	+10 / -15	3	✓ Full exchange observed
08-25 13:58	20m	-10 / -	EU2Q	- / -	2	Partial capture
08-25 13:57	20m	-10 / -	BH4ECL	- / -8	2	✓ Closing fragment
08-25 13:57	20m	- / -	F5IXN	+10 / -	4	Partial capture
08-25 13:56	20m	-9 / -7	DL8TV	-20 / -	4	✓ Closing observed
08-24 20:57	40m	- / -15	R7ZY	+4 / -	4	✓ Closing fragment
08-24 20:54	40m	- / -	UT3UQJ	+3 / -	3	Partial capture
08-24 20:46	40m	-18 / -	A71AH	-15 / -	2	✓ Closing observed
08-06 22:43	20m	- / -	DL0BSO	-16 / -	2	Partial capture
07-29 17:37	20m	- / -	PD1ADA	-22 / -	2	Partial capture
07-29 17:36	20m	- / -	OK2CNI	+10 / -	5	Partial capture
07-29 17:36	20m	- / -1	R4FDW	-21 / -	3	Partial capture
07-29 17:34	20m	- / -	F1SZC	-16 / -	2	Partial capture
07-29 17:34	20m	- / +3	IS0/IK2YCW	-14 / -	2	Partial capture
07-23 16:49	20m	-14 / -	R4UAS	- / -14	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
164800 -17 1690  JL1RUC EX7CQ RR73

40m

UTC    dB Audio  Message
182600  -6 2027  JL1RUC UB6OCP KN88
182930  +2 1417  JL1RUC EW2ZC -25 (x3)
183645  -6 2868  EW2ZC JL1RUC -12 (x3)
184115 +10 2719  JL1RUC EU4U R-11
184130 -10 2866  EU4U JL1RUC RR73
184145  +4 2719  JL1RUC EU4U 73
184315 -12 2866  EW8R JL1RUC -11
184345 -17 2383  JL1RUC UW5ESX KN67
184515 -12 1766  JL1RUC YO9BNP KN23 (x2)
184545  +5 2865  JL1RUC UA4FEN -01

10m

UTC    dB Audio  Message
104830 -10 1163  JL1RUC CU2AP HM77 (x5)

20m

UTC    dB Audio  Message
125200  +1 2518  JL1RUC PD2WL -11
125200  +0 1287  JL1RUC F6GGA JN37
125230  +0 2518  JL1RUC PD2WL -11 (x3)
125330  +4 2524  JL1RUC F1ODM -20
125400  +3 2518  JL1RUC PD2WL -11
125430  +4 2524  JL1RUC F1ODM -20 (x2)
125530  -1 2518  JL1RUC PD2WL -11
120315  -1 2412  JL1RUC RW6HPS LN15 (x5)

80m

UTC    dB Audio  Message
181030  +6 2005  JL1RUC UW2ZO KN67 (x3)
181200  +9 2737  JL1RUC RT6Z KN98 (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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