JA5NLN — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving JA5NLN, decoded by SO8OO in southeastern Poland. 11 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-08-21.

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 11 FT8 messages attributed to JA5NLN as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (82%), followed by 80 m (18%). In this small sample, the estimated median decoder S/N was -17 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-17 dB

Estimated median S/N

Bands

80m · 2 20m · 9

First attributed message: 2026-06-08
Last attributed message: 2026-08-21 20:09 UTC

Observed FT8 message patterns

Attributed sample: 11 messages
Active dates: 4 UTC dates
Estimated median S/N: -17 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, 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 JA5NLN in decoded directed-looking exchanges:

A61FJ · United Arab Emirates LY7M · Lithuania RK3QA · European Russia UA4FKT · European Russia EA6C · Balearic Islands SV5BYP · Dodecanese TN8GD · Republic of the Congo 4K6FO · Azerbaijan 5B4AMM · Cyprus EW2GI · Belarus OH1MLZ · Finland R7CD · European Russia

Most frequent locator attributed to JA5NLN

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 · 11 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,453 km (approx.)
Last such locator decoded: 2026-08-21 20:09 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	JA5NLN S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-14 20:37	80m	- / -	UT7UA	+6 / -	2	Partial capture
09-14 20:35	80m	- / -17	SV9CVY	-2 / -	3	✓ Closing fragment
09-09 20:50	80m	- / -	SP2HNF	+21 / -	3	Partial capture
09-09 20:50	80m	- / -	UX1AA	-11 / -	7	Partial capture
09-07 20:46	160m	- / -15	F5BZB	0 / -	2	Partial capture
09-07 20:43	160m	- / -12	UA4FKT	0 / -	4	✓ Closing fragment
09-07 20:42	160m	- / -12	RK3QA	-6 / -	3	✓ Closing fragment
09-07 20:32	160m	- / +6	LY7M	+14 / -	2	✓ Closing fragment
09-03 21:04	40m	- / -13	EX7CQ	-6 / -	3	Partial capture
08-30 20:36	80m	- / -	UX1AA	-1 / -	2	Partial capture
08-28 20:27	40m	- / -13	4K6FO	-14 / -	2	✓ Closing fragment
08-21 20:24	80m	- / -	SP2HNF	+14 / -	6	Partial capture
08-21 20:20	80m	- / -	SP2HNF	+14 / -	4	Partial capture
08-21 20:09	80m	-18 / -14	F8FUA	-7 / -	4	Partial capture
08-20 22:14	20m	- / -14	SV5BYP	-6 / -	3	✓ Closing fragment
08-14 20:37	80m	- / -22	TA3GO	-4 / -	2	✓ Closing fragment
08-13 21:30	40m	- / -12	5B4AMM	-12 / -	2	✓ Closing fragment
08-12 19:57	80m	- / -18	OH1MLZ	+10 / -	3	✓ Closing fragment
08-09 20:24	80m	- / -	YO3FRI	+5 / -	3	Partial capture
08-05 20:26	40m	- / -16	EW6X	-1 / -	2	Partial capture
08-04 20:28	40m	- / -20	GW8DX	-20 / -	2	Partial capture
08-03 20:51	20m	- / -12	TN8GD	-2 / -	2	✓ Closing fragment
07-27 20:01	80m	- / -	R6ZEJ	-11 / -	3	Partial capture
07-27 20:01	80m	- / -	RA4FW	-11 / -	2	Partial capture
07-27 20:00	80m	- / -	SV8CKM	-12 / -	3	Partial capture
07-26 19:58	80m	- / -7	UK8AEA	-24 / -	2	✓ Closing fragment
07-25 20:13	40m	- / -15	S51UN	-14 / -	2	Partial capture
07-25 20:10	40m	- / -	UB6OFG	-8 / -	2	Partial capture
07-25 20:08	40m	- / -22	EW2GI	-13 / -	2	✓ Closing fragment
07-23 20:11	80m	- / -18	R7IA	-2 / -	2	✓ Closing fragment
07-23 20:08	80m	- / -16	RT6Z	+13 / -	2	✓ Closing fragment
07-23 20:04	80m	- / -16	UR3CTU	+7 / -	5	✓ Closing fragment
07-23 19:58	80m	- / -18	R7CD	+5 / -	2	✓ Closing fragment
07-23 19:58	80m	- / -16	RO2X	0 / -	5	✓ Closing fragment
07-16 20:52	40m	- / -12	RW3ZC	0 / -	4	Partial capture
07-14 20:56	20m	- / -9	EA6C	-9 / -	6	✓ Closing fragment
06-28 11:52	10m	- / -18	A61FJ	-14 / -	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
205045  -9 1855  JA5NLN UX1AA KO70
205045 +18 2836  JA5NLN SP2HNF JO94
205115 -12 1855  JA5NLN UX1AA KO70
205115 +23 2836  JA5NLN SP2HNF JO94 (x2)
205215  -4 1855  JA5NLN UX1AA KO70 (x4)
205330  +3 2225  JA5NLN F5UKW -16
203545  -6  237  JA5NLN SV9CVY -17 (x3)
203745  +5 2810  JA5NLN UT7UA KO50 (x2)

160m

UTC    dB Audio  Message
203200 +14 1998  JA5NLN LY7M +06 (x2)
204200  -6 1496  JA5NLN RK3QA LO02 (x2)
204300  -2 2403  JA5NLN UA4FKT LO23
204300  -2 1496  JA5NLN RK3QA 73
204330  -1 2403  JA5NLN UA4FKT LO23 (x3)
204600  -3  862  JA5NLN F5BZB -15 (x2)

40m

UTC    dB Audio  Message
205330  +3 1466  JA5NLN UR5EDX KN78
202830 -23 1918  JA5NLN GW8DX -20 (x2)
202630  -2 2802  JA5NLN EW6X -16 (x2)
203200  -6 2765  JA5NLN Z34K -11
213045 -12 1441  JA5NLN 5B4AMM -12 (x2)
201845  +8 1453  JA5NLN UR1CCT KN69
202715 -15 2117  JA5NLN 4K6FO -13 (x2)
205930  -6 1735  JA5NLN EX7CQ -14 (x4)

20m

UTC    dB Audio  Message
205615 -12 2339  JA5NLN EA6C -09 (x6)
205130  -3  914  JA5NLN TN8GD -12 (x2)
221445  -9 1799  JA5NLN SV5BYP -14 (x3)

10m

UTC    dB Audio  Message
115215 -15 1840  JA5NLN A61FJ -18 (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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