JA4ONP — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM75

Receiver-side FT8 activity involving JA4ONP, decoded by SO8OO in southeastern Poland. 3 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-07-27 and 2026-08-25.

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 3 FT8 messages attributed to JA4ONP as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The available sample contains attributed decodes on 20 m (100%). The sample is too small to infer a recurring UTC-hour or received-S/N pattern.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

S/N pattern not inferred

Bands

20m · 3

First attributed message: 2026-07-27
Last attributed message: 2026-08-25 13:50 UTC

Observed FT8 message patterns

Attributed sample: 3 messages
Active dates: 2 UTC dates
S/N summary: Too few decodes
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with JA4ONP in decoded directed-looking exchanges:

Z34K · North Macedonia ×2 ES2AJ · Estonia R8FB · European Russia RK3QA · European Russia UA4HJ · European Russia UA6BRD · European Russia UA9FFV · European Russia UD8S · Asiatic Russia DA1JB · Fed. Rep. of Germany DM5WGL · Fed. Rep. of Germany EA3EDU · Spain EA7BD · Spain

Most frequent locator attributed to JA4ONP

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: PM75
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,477 km (approx.)
Last such locator decoded: 2026-07-27 18:31 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	JA4ONP S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-08 20:03	160m	- / -20	UA6BRD	-4 / -	2	✓ Closing fragment
09-08 19:36	160m	- / -16	RK3QA	-7 / -	3	✓ Closing fragment
08-28 20:22	80m	- / -14	RA3GZ	+8 / -	2	✓ Closing fragment
08-26 12:22	20m	- / -17	GM0SDV	-12 / -	2	Partial capture
08-26 11:27	20m	- / -15	RA3TOS	-16 / -	8	Partial capture
08-25 14:17	20m	- / -	M0CKX	-11 / -	3	Partial capture
08-25 13:50	20m	-15 / -	NA0D	- / -24	2	Partial capture
08-15 13:47	20m	- / -15	ON4IQ	0 / -	4	✓ Closing fragment
08-11 20:28	40m	- / -14	Z34K	-16 / -	3	✓ Closing fragment
07-27 19:28	20m	- / -3	IW2NEF	-2 / -	5	✓ Closing fragment
07-27 19:27	20m	- / -24	EA3EDU	-6 / -	5	✓ Closing fragment
07-27 19:26	20m	- / -13	PD7BDN	-15 / -	3	✓ Closing fragment
07-27 19:21	20m	- / -13	RL3K	-8 / -	4	✓ Closing fragment
07-27 19:12	20m	- / -12	EA7BD	-16 / -	6	✓ Closing fragment
07-27 19:00	20m	- / -13	US5HL	-1 / -	3	✓ Closing fragment
07-27 18:58	20m	- / -4	IS0/IK2YCW	-4 / -	2	Partial capture
07-27 18:52	20m	- / -9	PD7JLP	-2 / -	4	✓ Closing fragment
07-27 18:29	20m	- / +7	LX1TI	+6 / -	2	✓ Closing fragment
07-26 20:42	20m	- / -15	SV1GYN	-13 / -	6	✓ Closing fragment
07-25 18:15	40m	- / -16	Z34K	-7 / -	5	✓ Closing fragment
07-25 18:12	40m	- / -16	UA3PAB	-6 / -	6	✓ Closing fragment
07-25 18:02	40m	- / -	SO9AK	+1 / -	2	✓ Closing fragment
07-21 19:44	160m	- / -17	ES2AJ	+4 / -	2	✓ Closing fragment
07-21 19:41	160m	- / -18	UA9FFV	-14 / -	2	✓ Closing fragment
07-21 19:36	160m	- / -14	UD8S	-21 / -	3	✓ Closing fragment
07-21 19:25	160m	- / -15	R8FB	-11 / -	2	✓ Closing fragment
07-19 13:25	20m	- / -	EW1MN	-11 / -	3	✓ Closing fragment
07-07 18:23	20m	- / -13	IU2OQT	+5 / -	3	✓ Closing fragment
07-07 18:18	20m	- / -9	DA1JB	-10 / -	4	✓ Closing fragment
07-07 18:15	20m	- / -14	DM5WGL	-3 / -	5	✓ Closing fragment
07-07 18:10	20m	- / -6	HB9DTC	-16 / -	5	✓ Closing fragment
07-07 18:07	20m	- / -7	RA3TPJ	-10 / -	3	✓ Closing fragment
07-07 18:06	20m	- / -5	RL6MT	-6 / -	2	✓ Closing fragment
07-07 17:28	20m	- / -16	SP2WRE	-5 / -	3	✓ Closing fragment
07-07 17:26	20m	- / -	ON6MVR	-9 / -	2	Partial capture
07-07 17:19	20m	- / -19	RV3ZK	+2 / -	2	Partial capture
07-07 17:02	20m	- / -13	ON8BB	-4 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
193415  -9  567  JA4ONP UB6OAJ -15
193615 -21 1859  JA4ONP UD8S -14
193615  -9 1345  JA4ONP OH1JP KP00
193715 -19 1859  JA4ONP UD8S RR73 (x2)
194145 -14 2290  JA4ONP UA9FFV -18 (x2)
194400  +4 2166  JA4ONP ES2AJ -17 (x2)
193245 -21 1476  JA4ONP RA9YTI -13
193645  -8 1496  JA4ONP RK3QA -16 (x3)
200315  -7 1496  JA4ONP UA6BRD -20 (x2)

20m

UTC    dB Audio  Message
141800 -12 1862  JA4ONP M0CKX IO93 (x2)
112715 -17 2220  JA4ONP RA3TOS -15 (x8)
121930 -11 1450  JA4ONP R7DX R-23
122200 -13 2246  JA4ONP GM0SDV -17 (x2)
125000  -6 1287  JA4ONP F6GGA JN37
205200  -4  305  JA4ONP T77RN -05

80m

UTC    dB Audio  Message
201715 -24 2351  JA4ONP JE4JPQ RR73
201515 -11 1721  JA4ONP RD9U RR73
202245  +7 1152  JA4ONP RA3GZ -14 (x2)

40m

UTC    dB Audio  Message
181045 -15  802  JA4ONP RA5AK RR73
181245  -8 1585  JA4ONP UA3PAB -16 (x5)
181515  -7  513  JA4ONP Z34K KN01
181515  -6 1585  JA4ONP UA3PAB RR73
181545  -5  513  JA4ONP Z34K KN01 (x7)

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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