JA4FSH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM64

Receiver-side FT8 activity involving JA4FSH, decoded by SO8OO in southeastern Poland. 159 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 15 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-09-20.

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 159 FT8 messages attributed to JA4FSH as the transmitting token by decoded message structure across 15 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (58%), followed by 80 m (25%) and 20 m (16%). Several six-hour UTC windows tied for the largest share (100%), 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

159

Messages attributed

UTC dates decoded

Active 15-min windows

-6 dB

Estimated median S/N

Bands

160m · 1 80m · 40 40m · 93 20m · 25

First attributed message: 2026-06-09
Last attributed message: 2026-09-20 20:56 UTC

Observed FT8 message patterns

Attributed sample: 159 messages
Active dates: 15 UTC dates
Estimated median S/N: -6 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) 43, strong (≥ -8 dB) 97.

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 JA4FSH in decoded directed-looking exchanges:

YO3OBB · Romania ×2 SP9LCW · Poland ×2 EA3AKY · Spain IQ4JO · Italy OK4YL · Czech Republic DK7QJ · Fed. Rep. of Germany F5PZQ · France ON4IQ · Belgium PD0IFI · Netherlands 9A3TN · Croatia 9K2RT · Kuwait BH4GWF · China

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 JA4FSH

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: PM64 · 63 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,453 km (approx.)
Last such locator decoded: 2026-09-20 20:39 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	JA4FSH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 20:53	40m	+2 / -3	F6FHZ	-5 / -19	8	✓ Full exchange observed
09-20 20:53	40m	- / -26	G0OYQ	0 / -	2	Partial capture
09-20 20:52	40m	- / -7	G1CEC	-7 / -	3	✓ Closing fragment
09-20 20:49	80m	- / -17	EC3A	-20 / -	2	Partial capture
09-20 20:48	80m	- / -16	DK1ML	0 / -	3	Partial capture
09-20 20:45	80m	-20 / -25	DL7DL	+1 / -23	9	✓ Full exchange observed
09-20 20:44	80m	-15 / -9	RA6YDX	-13 / -	5	✓ Closing observed
09-20 20:44	80m	- / -10	SO100PKP	+22 / -	2	✓ Closing fragment
09-20 20:38	80m	-16 / -	EA6Y	- / -	2	Partial capture
09-19 20:47	160m	- / -24	OK4YL	+25 / -	3	✓ Closing fragment
09-18 21:16	40m	-10 / -	UB3ADO/P	- / -	4	Partial capture
09-18 21:05	160m	- / -	SP5GW	-4 / -	3	Partial capture
09-18 21:04	160m	- / -	OM2FY	+20 / -	2	Partial capture
09-18 21:04	160m	- / -	YO2MNZ	-4 / -	3	Partial capture
09-18 21:03	160m	- / -	OZ1ADL	-10 / -	3	Partial capture
09-16 21:16	40m	- / -	PD2PE	-10 / -	6	Partial capture
09-16 21:15	40m	- / -	IK1LZF	-5 / -	4	Partial capture
09-16 21:14	40m	- / -	PA3KUS	-4 / -	2	Partial capture
09-16 20:59	80m	- / -	F4ANC	-9 / -	10	Partial capture
09-16 20:56	80m	- / -12	RW6HPS	-19 / -	3	Partial capture
09-10 21:25	40m	0 / -9	SY1BKQ	-15 / -15	4	✓ Full exchange observed
09-10 21:23	40m	-2 / -	RY0LAC	- / +1	2	✓ Closing fragment
09-10 21:22	40m	0 / -	LP2E	- / -13	2	✓ Closing fragment
09-10 21:21	40m	-1 / -	YO3GNF	-6 / -	2	✓ Closing observed
09-10 21:20	40m	+2 / -	9K2RT	- / -22	2	✓ Closing fragment
09-10 21:17	40m	+4 / -	IK5ZPV	-1 / -15	5	✓ Closing observed
09-10 21:17	40m	- / -	G0SKW	-7 / -	3	Partial capture
09-10 21:16	40m	+3 / +7	OH6NIO	-2 / -14	5	✓ Full exchange observed
09-10 21:15	40m	- / -	PD2PE	-14 / -	2	Partial capture
09-10 21:12	40m	+2 / -15	DK5EO	+3 / -19	8	✓ Full exchange observed
09-10 21:11	40m	+2 / -	IN3IZQ	-20 / -	3	✓ Closing observed
09-10 21:05	80m	- / -18	RK4FH	-4 / -	2	✓ Closing fragment
09-10 21:03	80m	- / -16	YO6LM	+2 / -	2	✓ Closing fragment
09-10 21:00	80m	- / -	IN3WZS	-6 / -	3	Partial capture
09-10 20:49	80m	- / -	YO6LM	+12 / -	2	Partial capture
09-10 20:47	80m	- / -15	IK0SHH	+10 / -	5	✓ Closing fragment
09-09 21:25	40m	- / -	R2BNC	-7 / -	3	Partial capture
09-09 21:16	40m	- / -	R2BNC	-6 / -	6	Partial capture
09-09 21:14	40m	- / -15	DL1BJL	+12 / -	3	✓ Closing fragment
09-09 21:12	40m	-7 / -10	IZ5IMD	+20 / -	4	✓ Closing observed
09-09 21:10	40m	-12 / -10	TC2EYL	-2 / -11	4	✓ Full exchange observed
09-09 21:08	40m	-11 / -5	IK0QDM	0 / -	3	✓ Closing observed
09-09 20:58	80m	- / 0	IZ5ILK	+12 / -	2	✓ Closing fragment
09-09 20:56	80m	- / -14	YT1MP	+12 / -	2	✓ Closing fragment
09-09 20:49	80m	- / -5	SP2HNF	+24 / -	2	✓ Closing fragment
09-08 22:10	40m	- / -23	LX1FP	-4 / -	2	Partial capture
09-07 21:22	40m	-6 / -1	EA5JLN	-12 / -17	6	✓ Full exchange observed
09-07 21:21	40m	-8 / +4	IU8RFW	+1 / -7	6	✓ Full exchange observed
09-07 21:20	40m	-6 / -	PR2TX	- / -16	2	✓ Closing fragment
09-07 21:19	40m	- / -8	I8IGS	-4 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
211945 -10 1053  SV1MOZ JA4FSH -14
205245  -8 2269  JA4FSH G1CEC IO83 (x3)
205345  -2  995  JA4FSH G0OYQ IO93
205345  -9 2572  JA4FSH F6FHZ JN18
205415  +2 1338  JA4FSH PA1AA JO21
205415  +2  995  JA4FSH G0OYQ R-26
205415 -10 2573  JA4FSH F6FHZ JN18 (x3)
205530  +0 2572  F6FHZ JA4FSH -19
205545  -2 2572  JA4FSH F6FHZ R-03
205600  +3 2573  F6FHZ JA4FSH RR73
205615  -4 2572  JA4FSH F6FHZ 73

80m

UTC    dB Audio  Message
204545 -15 2537  RA6YDX JA4FSH RR73
204600 -14 1972  JA4FSH RA6YDX 73
204600  -5 2128  JA4FSH DL7DL JO62 (x3)
204745 -20 2537  DL7DL JA4FSH -23
204800 +11 2128  JA4FSH DL7DL R-25 (x2)
204830  +1  890  JA4FSH DK1ML -16
204900  +7 2128  JA4FSH DL7DL R-25
204900  +1  890  JA4FSH DK1ML -16
204930 -20 1663  JA4FSH EC3A -17
204930  +5 2128  JA4FSH DL7DL 73
204930  -3  890  JA4FSH DK1ML -16
205000 -19 1663  JA4FSH EC3A -17

160m

UTC    dB Audio  Message
210300 -10 1723  JA4FSH OZ1ADL JO46
210315  -5  866  RA9YTI JA4FSH PM64
210330 -13 1723  JA4FSH OZ1ADL JO46 (x2)
210430  -9 1068  JA4FSH YO2MNZ KN15
210430 +22 2592  JA4FSH OM2FY JN88
210500  -3 1068  JA4FSH YO2MNZ KN15
210500 +17 2592  JA4FSH OM2FY JN88
210530  +1 1068  JA4FSH YO2MNZ KN15
210530  -3 1846  JA4FSH SP5GW KO12 (x3)
204715 +27 2802  JA4FSH OK4YL -24 (x3)

10m

UTC    dB Audio  Message
095015 -15 2343  JA4FSH IQ4JO RR73
095015 -17 1222  JA4FSH EA3AKY +00 (x2)
095330 -19 1597  JA4FSH F1PFU JN26
095645  +8 2662  JA4FSH S56P -01 (x2)
083645 -14 1300  JA4FSH YO3OBB -10 (x2)
114630 -16 2434  JA4FSH F6CEE IN94 (x2)

20m

UTC    dB Audio  Message
213400 -12  616  DK7QJ JA4FSH RR73
213500  -9  616  PD0IFI JA4FSH RR73
213515 -19  617  JA4FSH F5PZQ JN19
213600  -6  616  F5PZQ JA4FSH -16 (x2)
213645  -4  617  JA4FSH M0DSK IO83
213700 -10  616  F5PZQ JA4FSH RR73
213715  +8  617  JA4FSH M0DSK IO83
213730 -11  616  F5PZQ JA4FSH RR73
213745 +11  614  JA4FSH M0DSK IO83 (x4)
214100  -8  615  UT0IN JA4FSH -10
214215  +0 1712  JA4FSH PD2V JO22

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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