JA0FMU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM96

Receiver-side FT8 activity involving JA0FMU, decoded by SO8OO in southeastern Poland. 81 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-07-15 and 2026-09-06.

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 81 FT8 messages attributed to JA0FMU as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (94%), followed by 80 m (5%) and 20 m (1%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

80m · 4 40m · 76 20m · 1

First attributed message: 2026-07-15
Last attributed message: 2026-09-06 21:08 UTC

Observed FT8 message patterns

Attributed sample: 81 messages
Active dates: 8 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -22 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 32, moderate (-15 to -9 dB) 38, strong (≥ -8 dB) 11.

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 JA0FMU in decoded directed-looking exchanges:

LZ1GC · Bulgaria ×2 EA3AKY · Spain I0KMJ · Italy IZ2ACM · Italy PA3KUS · Netherlands 4O4DB · Montenegro 4X1UF · Israel 9K2YM · Kuwait A61DD · United Arab Emirates BG0HP · China BH3MPM · China DL6NDN · Fed. Rep. of Germany

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 JA0FMU

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: PM96 · 31 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,603 km (approx.)
Last such locator decoded: 2026-09-06 21:07 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	JA0FMU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-06 21:14	40m	- / -	UX1VT	-1 / -	2	Partial capture
09-06 21:08	40m	- / -	UX1VT	0 / -	2	Partial capture
09-06 21:06	40m	-23 / -	LU5FCI	- / -	3	✓ Closing fragment
09-06 20:07	40m	- / -	ER1BF	+1 / -	4	Partial capture
09-06 20:07	40m	- / -12	F5SPJ	-6 / -	4	Partial capture
09-06 20:07	40m	- / -	IU2OQT	+2 / -	12	Partial capture
09-06 20:07	40m	-8 / -	A61DD	- / -11	4	✓ Closing fragment
09-06 20:05	40m	-8 / -2	LZ1GC	+12 / -7	8	✓ Full exchange observed
09-06 19:58	40m	- / -11	OH7BDI	-15 / -	3	Partial capture
09-06 19:58	40m	- / -	UT5ZC	0 / -	2	✓ Closing fragment
09-06 19:55	80m	- / -	UT7UA	+6 / -	7	Partial capture
09-05 20:38	40m	- / -	RD6OB	+3 / -	5	Partial capture
09-05 20:29	40m	-16 / -20	9K2YM	-4 / -14	5	✓ Full exchange observed
09-04 20:50	40m	- / -	IW0RLC	+6 / -	2	Partial capture
09-04 20:46	40m	- / -19	CN8NS	-2 / -	3	Partial capture
09-04 20:44	40m	-10 / -3	S57TW	+18 / -	9	✓ Closing observed
09-04 20:39	40m	-8 / -	HA7TM	- / -	4	Partial capture
09-04 20:34	40m	-9 / -	HA7TM	- / -	4	Partial capture
09-04 20:20	40m	- / -6	HA7TM	-2 / -	5	Partial capture
09-04 20:06	40m	-13 / -	V51WH	- / -22	2	Partial capture
09-04 19:26	40m	-12 / -7	HA7TM	+6 / -	4	Partial capture
09-04 19:24	40m	- / -13	RA4HG	-6 / -	2	✓ Closing fragment
09-04 19:23	40m	- / -10	LA8ENA	+12 / -	2	✓ Closing fragment
09-04 19:18	40m	- / -10	SV5BYP	-3 / -	4	✓ Closing fragment
09-04 19:05	40m	- / -	OE9GWV	-4 / -	5	Partial capture
09-04 19:05	40m	-14 / -13	SV9QWC	-1 / -26	4	Partial capture
09-04 19:04	40m	-15 / -4	ON4IQ	+17 / -12	4	✓ Full exchange observed
09-04 19:00	40m	- / -	YO8RQP	+1 / -	5	Partial capture
09-04 18:55	80m	- / -	IW8RQA	+3 / -	3	Partial capture
09-03 20:57	40m	- / -	EA5OM	-12 / -	4	Partial capture
09-03 20:52	40m	- / -	F4JVF	-6 / -	2	Partial capture
09-03 20:49	40m	-21 / -15	TA7MMI	0 / -	3	✓ Closing observed
09-03 20:46	40m	- / -	EB3JT	-20 / -	2	Partial capture
09-03 20:46	40m	- / -14	IZ8EYN	-12 / -	2	Partial capture
09-03 20:44	40m	-18 / 0	RY4D	-8 / -8	4	✓ Full exchange observed
09-03 20:42	40m	- / -18	US5ZFT	0 / -	3	Partial capture
09-03 20:41	40m	-19 / -7	OZ0ZZ	+5 / -16	3	✓ Full exchange observed
09-03 20:39	40m	- / -	YO6PNM	-2 / -	7	Partial capture
09-03 20:38	40m	- / -	ON4IQ	+16 / -	9	Partial capture
09-03 20:34	40m	-17 / -14	LB7ZG	-1 / -15	8	✓ Closing observed
09-03 20:32	40m	-14 / -	4O4DB	- / -17	4	✓ Closing fragment
09-03 20:31	40m	-14 / -	UA0LQE	- / +1	2	Partial capture
09-03 20:29	40m	-14 / -	TN8GD	- / -16	3	✓ Closing fragment
09-02 20:50	40m	- / -	DL2HUC	+2 / -	2	Partial capture
09-02 20:48	40m	- / -12	SP6FME	-10 / -	2	✓ Closing fragment
09-02 20:44	40m	-24 / -5	TC2EYL	-10 / -	3	✓ Closing observed
09-02 20:34	40m	- / -4	IU8QTW	+2 / -	5	✓ Closing fragment
09-02 20:31	40m	- / -	DL3RDO	-6 / -	5	Partial capture
09-02 20:28	40m	-15 / -23	EA3XR	-8 / -15	5	✓ Full exchange observed
09-02 20:28	40m	- / -11	IR7MGGC	-8 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
201045  -1  628  JA0FMU IU2OQT JN45 (x2)
201130 -11  906  E21AZ JA0FMU PM96
201145  +1  628  JA0FMU IU2OQT JN45 (x4)
201930  -6  906  RO7A JA0FMU -12
210645 -22 1367  LU5FCI JA0FMU PM96 (x3)
210830  +1 1367  JA0FMU UX1VT KN68 (x4)

80m

UTC    dB Audio  Message
194445  -7  915  JA0FMU LZ1ZJ KN12 (x4)
150730 -13 2474  JA0FMU RY3D 73
185530  +5  272  JA0FMU IW8RQA JM88 (x3)
195515  +9 2754  JA0FMU UT7UA KO50 (x7)

10m

UTC    dB Audio  Message
081315 -13 1944  JA0FMU I0KMJ -12 (x2)
114600  -7 1455  JA0FMU IZ2ACM -10 (x2)
115345 -11  972  JA0FMU EA3AKY 73
113830 -20 1610  JA0FMU A61FJ R-02

20m

UTC    dB Audio  Message
184100 -21 1706  JA0FMU 7X3WPL RRR
184130 -10  268  JA0FMU F4IIX IN95
184215 -18 2202  PA3KUS JA0FMU RR73
184300 -11  267  JA0FMU F4IIX IN95 (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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