JF1UVJ — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving JF1UVJ, decoded by SO8OO in southeastern Poland. 1,136 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 50 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-10-04.

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 1,136 FT8 messages attributed to JF1UVJ as the transmitting token by decoded message structure across 50 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (75%), followed by 40 m (24%) and 80 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 -7 dB.

Overview

1,136

Messages attributed

UTC dates decoded

156

Active 15-min windows

-7 dB

Estimated median S/N

Bands

80m · 10 40m · 277 20m · 849

First attributed message: 2026-06-07
Last attributed message: 2026-10-04 20:04 UTC

Observed FT8 message patterns

Attributed sample: 1,136 messages
Active dates: 50 UTC dates
Estimated median S/N: -7 dB
Estimated 10th-90th percentile: -15 to +2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 93, moderate (-15 to -9 dB) 391, strong (≥ -8 dB) 652.

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 JF1UVJ in decoded directed-looking exchanges:

OT7K · Belgium ×3 9A3K · Croatia ×2 DK0SD · Fed. Rep. of Germany ×2 EA5RO · Spain ×2 EB3JT · Spain ×2 F1SZC · France ×2 GW8DX · Wales ×2 IT9BCC · Sicily ×2 M9TAM · England ×2 RK3AF · European Russia ×2 S57TW · Slovenia ×2 S58Z · Slovenia ×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 JF1UVJ

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 · 687 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,693 km (approx.)
Last such locator decoded: 2026-10-02 20:42 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	JF1UVJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-07 20:34	40m	- / -	IT9ZGW	-15 / -	3	Partial capture
10-07 20:18	40m	- / -9	YO3KWJ	-12 / -	4	✓ Closing fragment
10-04 20:33	80m	- / -19	UW5KW	+12 / -	2	✓ Closing fragment
10-04 20:18	80m	- / -	SP4JSR	+5 / -	3	Partial capture
10-04 20:17	80m	- / -14	RZ4AT	-6 / -	2	✓ Closing fragment
10-04 20:14	80m	- / -9	RW9MZ	-14 / -	2	✓ Closing fragment
10-04 20:13	80m	- / -15	DJ7M	+26 / -	2	Partial capture
10-04 20:03	80m	-20 / -	V51WH	- / -26	2	Partial capture
10-04 19:50	80m	- / -8	UA4FKT	+8 / -	4	✓ Closing fragment
10-04 19:49	80m	- / -12	RY4D	-12 / -	2	✓ Closing fragment
10-04 19:47	80m	- / -15	DJ7M	+19 / -	2	✓ Closing fragment
10-04 19:40	80m	- / -15	RT6Z	0 / -	2	✓ Closing fragment
10-04 19:35	80m	- / -21	OM5FM	+15 / -	2	Partial capture
10-04 19:32	80m	- / -17	OT7K	+6 / -	2	✓ Closing fragment
10-04 19:20	80m	- / -6	UA9MA	+2 / -	2	✓ Closing fragment
10-04 19:11	80m	- / -	DJ7M	+23 / -	2	Partial capture
10-02 21:00	40m	- / -16	DL7GAL	-16 / -	7	✓ Closing fragment
10-02 20:52	40m	-18 / -8	R2GDV	-8 / -	5	✓ Closing observed
10-02 20:40	40m	- / -15	3Z4DX	-10 / -	2	✓ Closing fragment
10-02 20:26	40m	- / -13	IK1JUS	+1 / -	5	✓ Closing fragment
10-02 20:24	40m	- / -17	OH5KNL	+14 / -	2	✓ Closing fragment
10-02 20:23	40m	- / -20	II5GG	0 / -	2	✓ Closing fragment
10-02 19:40	80m	- / -17	EI4KF	+12 / -	2	✓ Closing fragment
10-01 20:40	80m	- / -18	5B4AMM	+4 / -	2	✓ Closing fragment
10-01 19:32	40m	- / -	GI7NKK	-9 / -	3	Partial capture
10-01 19:31	40m	-11 / 0	RU3GC	0 / -3	5	✓ Full exchange observed
10-01 19:29	40m	-13 / -2	LX1JH	+11 / -	4	✓ Closing observed
10-01 19:28	40m	- / -	EA1KCN	-5 / -	2	Partial capture
10-01 19:24	40m	-11 / -16	SV2SCB	-1 / -16	9	Partial capture
10-01 19:24	40m	- / -	EA1KCN	-8 / -	2	Partial capture
10-01 19:23	40m	-10 / -2	R7YZ	-12 / -	3	✓ Closing observed
10-01 19:22	40m	- / -	DL9UW	+11 / -	9	Partial capture
10-01 19:22	40m	- / -	PE1NPS	-5 / -	3	Partial capture
09-30 21:15	40m	-23 / -15	SV3GKU	-4 / -15	3	✓ Full exchange observed
09-30 21:11	40m	- / -	PD0PY	-3 / -	3	Partial capture
09-30 21:09	40m	- / -21	SX2LGT	+1 / -	2	Partial capture
09-30 20:59	40m	-10 / -17	GM4FDM	0 / -17	5	✓ Full exchange observed
09-30 20:55	40m	-13 / -	HB9JOE	- / -	4	Partial capture
09-30 20:53	40m	- / -	IU8RFW	-13 / -	4	Partial capture
09-30 20:52	40m	-13 / -14	DB3FS	+12 / -18	5	✓ Full exchange observed
09-28 20:20	40m	-10 / -3	R4RZ	-4 / -	3	✓ Closing observed
09-27 20:38	40m	- / -13	F4GRW	0 / -	2	✓ Closing fragment
09-27 20:33	40m	- / -	CR7BRV	-6 / -	6	Partial capture
09-27 20:32	40m	- / -	PA1VW	-6 / -	8	Partial capture
09-27 20:27	40m	- / -	PA1VW	-6 / -	2	Partial capture
09-27 20:16	80m	-16 / -	SP9WZS	+18 / -	2	✓ Closing observed
09-26 21:13	40m	- / -	F1GUQ	-9 / -	5	Partial capture
09-26 20:33	40m	- / -	DL3RDO	-21 / -	2	Partial capture
09-26 20:04	40m	- / -6	RU5A	-5 / -	4	✓ Closing fragment
09-26 20:00	40m	- / -8	R2OM	-10 / -	5	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
210330 -10 1070  JF1UVJ DL7GAL JN47 (x4)
201315 -14 1024  JF1UVJ 8Q7PR RR73
201830  -8 1313  JF1UVJ YO3KWJ -09 (x4)
203400 -14 1758  JF1UVJ IT9ZGW JM76
203430 -15 1732  JF1UVJ IZ8DFO RR73
203430 -15 1758  JF1UVJ IT9ZGW JM76 (x2)
203630 -14 2420  JF1UVJ EA3DM -16
204130 -14  845  JF1UVJ TA1CQ RR73

80m

UTC    dB Audio  Message
195200  +6 2468  JF1UVJ UA4FKT 73
200345 -22 2469  V51WH JF1UVJ R-26 (x2)
201300 +27  657  JF1UVJ DJ7M -15 (x2)
201400 -17 1827  JF1UVJ RW9MZ -09 (x2)
201700  -8 2290  JF1UVJ RZ4AT R-14 (x2)
201800  +2 1683  JF1UVJ SP4JSR KO12 (x3)
202930  +8  863  JF1UVJ ON8DM JO10
203330 +12 1763  JF1UVJ UW5KW -19 (x2)

20m

UTC    dB Audio  Message
215145  -9 2608  PP7GB JF1UVJ PM95
215415 -11 2608  F4AGZ JF1UVJ 73
215515  -9 2607  M0GQC JF1UVJ PM95 (x4)
220200 -12 2568  F1IQH JF1UVJ PM95
220445  -5 1638  JF1UVJ F6FLU +09
220500 -19 2128  F6FLU JF1UVJ R-09
220515 -10 1639  JF1UVJ F6FLU RR73
220745 -19 1294  JF1UVJ F6EAZ JN27 (x3)
221530 -14 1872  JF1UVJ CE4KM RR73 (x2)

60m

UTC    dB Audio  Message
193915  -2 1508  JF1UVJ S57MPU JN76 (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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