JA4LKB — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM53

Receiver-side FT8 activity involving JA4LKB, decoded by SO8OO in southeastern Poland. 5 FT8 messages attributed to this token as transmitter, on 80m, across 2 UTC dates in the available aggregate history. Observed between 2026-08-31 and 2026-09-01.

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 5 FT8 messages attributed to JA4LKB as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (100%). In this small sample, the estimated median decoder S/N was -14 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

80m · 5

First attributed message: 2026-08-31
Last attributed message: 2026-09-01 20:48 UTC

Observed FT8 message patterns

Attributed sample: 5 messages
Active dates: 2 UTC dates
Estimated median S/N: -14 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 4, strong (≥ -8 dB) 0.

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 JA4LKB in decoded directed-looking exchanges:

IK5CHL · Italy LZ2EV · Bulgaria RI1FJL · Franz Josef Land UZ5ZV · Ukraine YO4DW · Romania

Most frequent locator attributed to JA4LKB

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: PM53 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,425 km (approx.)
Last such locator decoded: 2026-09-01 20:48 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	JA4LKB S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-01 21:08	80m	- / -19	F6CTT	0 / -	3	Partial capture
09-01 21:07	80m	- / -14	UZ5ZV	+2 / -	2	✓ Closing fragment
09-01 21:03	80m	- / -19	F6CTT	+7 / -	4	Partial capture
09-01 20:58	80m	- / -13	CT1FJO	-4 / -	12	Partial capture
09-01 20:57	80m	- / -	EA7KBX	-8 / -	2	Partial capture
09-01 20:56	80m	- / -	ON5JV	-16 / -	4	Partial capture
09-01 20:55	80m	- / -26	IK1LRX	-3 / -	3	Partial capture
09-01 20:54	80m	- / -13	R6KX	+2 / -	5	Partial capture
09-01 20:54	80m	- / -16	IK5CHL	-6 / -	3	✓ Closing fragment
09-01 20:51	80m	- / -	RU5X	-18 / -	4	Partial capture
09-01 20:48	80m	- / -16	F6CTT	+6 / -	2	Partial capture
09-01 20:48	80m	- / -26	IK1LRX	-6 / -	3	Partial capture
09-01 20:47	80m	-10 / -7	YO4DW	+9 / -	6	✓ Full exchange observed
09-01 20:46	80m	- / -	SP5AA	+8 / -	3	Partial capture
09-01 20:45	80m	- / -14	EA5KT	-12 / -	2	Partial capture
09-01 20:39	160m	- / -	LA6OP	-14 / -	2	Partial capture
08-31 17:04	80m	- / -17	RA4HG	-16 / -	9	Partial capture
08-31 17:03	80m	-14 / -	RI1FJL	- / -16	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
210245  -5  666  JA4LKB CT1FJO -13
210315  +7 1433  JA4LKB F6CTT -19
210315  +1  666  JA4LKB CT1FJO -13
210345  +6 1433  JA4LKB F6CTT -19
210345  +0  667  JA4LKB CT1FJO -13
210415  +8 1433  JA4LKB F6CTT -19
210415  -2  666  JA4LKB CT1FJO -13
210445  +7 1433  JA4LKB F6CTT -19
210730  +5 2123  JA4LKB UZ5ZV -14 (x2)
210845  +1 2603  JA4LKB F6CTT -19 (x3)
211030 +21 2076  JA4LKB YO7CJB -13
212530  +7 2229  JA4LKB UA4FKT LO23

160m

UTC    dB Audio  Message
203900 -10 1046  JA4LKB LA6OP JO59 (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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