JA6JSY — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM42

Receiver-side FT8 activity involving JA6JSY, decoded by SO8OO in southeastern Poland. 31 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-07.

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 31 FT8 messages attributed to JA6JSY as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (65%), followed by 80 m (35%). Most decodes (100%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (61%); the estimated median was -7 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-7 dB

Estimated median S/N

Bands

80m · 11 20m · 20

First attributed message: 2026-06-06
Last attributed message: 2026-08-07 17:57 UTC

Observed FT8 message patterns

Attributed sample: 31 messages
Active dates: 6 UTC dates
Estimated median S/N: -7 dB
Estimated 10th-90th percentile: -24 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 9, moderate (-15 to -9 dB) 3, strong (≥ -8 dB) 19.

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.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with JA6JSY in decoded directed-looking exchanges:

EC3A · Spain PI4DX · Netherlands EI4KF · Ireland LY8O · Lithuania LZ1GC · Bulgaria OH1MLZ · Finland OH6JD · Finland RY7F · European Russia SP2HNF · Poland TN8GD · Republic of the Congo

Most frequent locator attributed to JA6JSY

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: PM42 · 23 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,394 km (approx.)
Last such locator decoded: 2026-08-07 17:57 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	JA6JSY S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-16 16:21	80m	- / -	S51DI	+8 / -	2	Partial capture
08-18 20:53	80m	- / -15	LY8O	+5 / -	2	✓ Closing fragment
08-18 20:53	80m	- / -18	RY7F	-11 / -	6	✓ Closing fragment
08-12 19:31	80m	- / -19	LZ1GC	+4 / -	3	✓ Closing fragment
08-10 21:19	40m	- / -	R3SN	-6 / -	4	Partial capture
08-10 20:48	80m	- / -21	EI4KF	+10 / -	2	✓ Closing fragment
08-10 20:26	80m	- / -	RO2X	-4 / -	7	Partial capture
08-10 20:25	80m	- / -16	SP2HNF	+17 / -	7	✓ Closing fragment
08-10 20:23	80m	- / -17	OH1MLZ	+6 / -	8	✓ Closing fragment
08-10 20:22	80m	- / -12	OH6JD	-6 / -	2	✓ Closing fragment
08-07 17:56	80m	- / -	RQ7O	+8 / -	2	Partial capture
08-07 17:54	80m	- / -	RX6DA	-1 / -	5	Partial capture
08-07 17:53	80m	-17 / -	LY3BRA	- / -	6	Partial capture
07-19 21:07	20m	-4 / -9	EC3A	-10 / -	3	✓ Closing observed
07-19 21:04	20m	-3 / -	5N0YEN	- / -	3	Partial capture
07-05 20:56	40m	- / -15	PI4DX	+4 / -	5	✓ Closing fragment
06-24 18:43	80m	- / -	RN2T	+1 / -	8	Partial capture
06-24 18:36	80m	-22 / -	4Z5AV	- / -13	2	Partial capture
06-24 18:36	80m	- / -	UT4WT	+11 / -	5	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
204830 +10  612  JA6JSY EI4KF -21 (x2)
193100  +3 1479  JA6JSY LZ1GC R-19 (x3)
205300  -6 1637  JA6JSY RY7F LN04
205330  +9  953  JA6JSY LY8O -15
205400  -5 1636  JA6JSY RY7F LN04
205400  +1  953  JA6JSY LY8O RR73
205430 -13 1636  JA6JSY RY7F LN04 (x4)
162130  +6 2095  JA6JSY S51DI JN76 (x2)

40m

UTC    dB Audio  Message
205615  +5 2082  JA6JSY PI4DX -15 (x5)
211930 -11 2668  JA6JSY R3SN KO94 (x4)

20m

UTC    dB Audio  Message
201900 -12  618  JA6JSY 4X1YA +16
210400  -5 2770  5N0YEN JA6JSY PM42 (x3)
210745 -10 1798  JA6JSY EC3A -09 (x2)
210830  -4 2770  EC3A JA6JSY 73
210300  -4  363  JA6JSY RA3ZH KO81
210815  -2 2794  JA6JSY EA5XA IM98

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee