JA3JKK — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving JA3JKK, decoded by SO8OO in southeastern Poland. 1 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-08-27.

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 FT8 messages attributed to JA3JKK as the transmitting token by decoded message structure across 1 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 · 1

First attributed message: 2026-08-27
Last attributed message: 2026-08-27 21:23 UTC

Observed FT8 message patterns

Attributed sample: 1 messages
Active dates: 1 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 JA3JKK in decoded directed-looking exchanges:

4X1UF · Israel 4X5MZ · Israel 4Z5PG · Israel 8Z1IT · Saudi Arabia 9A2AJ · Croatia 9K2ES · Kuwait 9K2GR · Kuwait EA8UP · Canary Islands IS0AEL · Sardinia JY5CG · Jordan LZ2INP · Bulgaria OK2CNI · Czech Republic

Most frequent locator attributed to JA3JKK

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: 2026-08-27 21:23 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	JA3JKK S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-14 19:54	40m	- / -16	R4ZZ	0 / -	2	Partial capture
09-13 20:33	80m	- / -16	S59A	+24 / -	3	✓ Closing fragment
09-09 20:45	80m	- / -19	UX5UO	+18 / -	3	✓ Closing fragment
09-06 19:33	40m	- / -17	US3LX	+2 / -	2	Partial capture
08-28 21:46	20m	- / -9	LZ2INP	+1 / -	4	✓ Closing fragment
08-27 21:53	20m	- / -	RA3ZH	0 / -	3	Partial capture
08-27 21:10	20m	- / -4	9K2GR	-14 / -	3	✓ Closing fragment
08-20 22:21	20m	- / -15	8Z1IT	-12 / -	2	✓ Closing fragment
08-11 22:00	20m	- / -16	9A2AJ	-5 / -	3	✓ Closing fragment
08-10 21:56	20m	- / -15	9K2ES	-20 / -	2	✓ Closing fragment
08-07 21:49	20m	- / -14	7X5CY	-4 / -	2	Partial capture
07-31 22:08	20m	- / -	<...>	-20 / -	2	✓ Closing fragment
07-29 14:21	20m	- / -5	RA3AHN	-16 / -	3	✓ Closing fragment
07-29 14:15	20m	- / -14	RC6OU	-10 / -	2	✓ Closing fragment
07-29 14:12	20m	- / -	RC6OU	0 / -	3	Partial capture
07-24 12:37	20m	- / -	RC6OU	+5 / -	4	Partial capture
07-20 22:16	20m	- / -9	EA5PC	-7 / -	2	Partial capture
07-20 21:17	20m	- / -	Z34K	-10 / -	3	Partial capture
07-18 19:33	20m	- / -17	JY5CG	-15 / -	2	✓ Closing fragment
07-17 21:49	20m	- / -15	EC5K	+1 / -	2	Partial capture
07-16 22:16	20m	- / -23	EA7ALL	+1 / -	2	Partial capture
07-16 21:46	20m	- / -16	EA7ALL	+9 / -	5	Partial capture
07-16 21:45	20m	- / -9	IS0AEL	+2 / -	2	✓ Closing fragment
07-16 06:31	20m	- / -24	<...>	-12 / -	3	Partial capture
07-16 06:23	20m	- / -24	<...>	-19 / -	3	Partial capture
07-14 21:45	20m	- / -	RC6OU	-2 / -	2	Partial capture
07-14 21:43	20m	- / -17	EA8UP	-1 / -	7	✓ Closing fragment
07-14 21:01	20m	- / -23	EA8UP	-1 / -	8	Partial capture
07-09 22:03	20m	- / -5	4X1UF	-8 / -	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
184630 -11  566  JA3JKK OH6O KP22
193300  +3 1314  JA3JKK US3LX KN89 (x2)
195430  -1 2727  JA3JKK R4ZZ -16 (x2)

80m

UTC    dB Audio  Message
204545 +18 1193  JA3JKK UX5UO KO50 (x3)
203315 +25  690  JA3JKK S59A -16 (x3)

20m

UTC    dB Audio  Message
222200 -10 2435  JA3JKK 8Z1IT RR73
210530  -9 2074  JA3JKK SV5BYP -17
210830 +13  341  JA3JKK IZ2DPX R-13
211030  -9 2258  JA3JKK 9K2GR -04 (x3)
211715 -17 2249  JA3JKK ZL3OY RR73
212330 -24 1844  LU7DOO JA3JKK PM75
215345  -2  267  JA3JKK RA3ZH KO81 (x3)
214600  +2  520  JA3JKK LZ2INP KN34 (x4)

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