JA3ADW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM74

Receiver-side FT8 activity involving JA3ADW, decoded by SO8OO in southeastern Poland. 9 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-07-21.

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 9 FT8 messages attributed to JA3ADW as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -11 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

20m · 9

First attributed message: 2026-06-12
Last attributed message: 2026-07-21 21:49 UTC

Observed FT8 message patterns

Attributed sample: 9 messages
Active dates: 2 UTC dates
Estimated median S/N: -11 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 1.

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 JA3ADW in decoded directed-looking exchanges:

C31CT · Andorra CR2WWA · Azores CX1UI · Uruguay CX8DS · Uruguay DG6VC · Fed. Rep. of Germany EA3BIC · Spain F4IBJ · France G3PDQ · England M0ABG · England OL6WWA · Czech Republic ON6AA · Belgium ON7DJ · Belgium

Most frequent locator attributed to JA3ADW

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: PM74 · 8 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,565 km (approx.)
Last such locator decoded: 2026-07-21 21:49 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	JA3ADW S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-08 21:14	40m	- / -14	SV8/F6BLP	+4 / -	2	Partial capture
08-24 21:30	20m	- / -15	CX8DS	-14 / -	2	✓ Closing fragment
08-24 21:22	20m	- / -14	C31CT	-12 / -	2	✓ Closing fragment
08-24 20:20	20m	- / -4	ON7DJ	-3 / -	4	✓ Closing fragment
08-24 20:17	20m	- / -	EA3BIC	+2 / -	5	✓ Closing fragment
08-24 20:16	20m	- / -	M0LAD	-2 / -	2	Partial capture
08-24 20:14	20m	- / -11	DG6VC	-6 / -	7	✓ Closing fragment
08-24 20:13	20m	- / -6	G3PDQ	+10 / -	2	✓ Closing fragment
08-12 21:21	20m	- / -7	RA6OF	-6 / -	2	✓ Closing fragment
08-12 21:13	20m	- / -17	ON7NQ	+5 / -	6	✓ Closing fragment
07-21 21:48	20m	-10 / -	TU5MM	- / -	2	Partial capture
07-21 21:40	20m	-10 / -	TU5MM	- / -	4	Partial capture
07-14 19:43	40m	- / -	G4IFX	-3 / -	4	Partial capture
07-14 19:41	40m	- / -17	R3XBS	-11 / -	2	✓ Closing fragment
07-14 19:33	40m	- / -13	LY2HM	+7 / -	2	✓ Closing fragment
07-11 20:19	40m	- / -19	R6FX	-6 / -	2	Partial capture
07-03 21:08	20m	- / -	EA5RT	-8 / -	4	Partial capture
06-29 20:22	20m	- / -7	ON6AA	+8 / -	3	✓ Closing fragment
06-29 20:21	20m	- / -12	SN0WWA	-14 / -	2	Partial capture
06-29 20:20	60m	- / -12	EA4T	-13 / -	3	Partial capture
06-29 20:04	20m	- / -2	OL6WWA	-16 / -	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
201915  -6  330  JA3ADW R6FX LN14 (x2)
193315  +7 2856  JA3ADW LY2HM -13 (x2)
193445  -6 2707  JA3ADW RV3GZ KO92
193545  -4 2970  JA3ADW OH1EDK RR73
194145  -8 1096  JA3ADW R3XBS -17 (x2)
194315  -4  669  JA3ADW G4IFX IO91 (x4)
211400  +2  433  JA3ADW SV8/F6BLP -14 (x2)

20m

UTC    dB Audio  Message
201845  +1 2065  JA3ADW EA3BIC JN11 (x2)
202015  -1 2476  JA3ADW ON7DJ JO21
202015  +5 2065  JA3ADW EA3BIC 73
202045  -5 2476  JA3ADW ON7DJ JO21 (x3)
212200 -14 2050  JA3ADW C31CT -14 (x2)
213000 -15 2254  JA3ADW CX8DS -15 (x2)
214245  +1  643  JA3ADW ZA/IK3BNO -15
214300  -9 1261  JA3ADW CX1UI -16 (x2)
215300 -17 1656  JA3ADW F4IBJ 73

60m

UTC    dB Audio  Message
202030 -13 1332  JA3ADW EA4T -12 (x3)

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