JA0VTS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM97

Receiver-side FT8 activity involving JA0VTS, decoded by SO8OO in southeastern Poland. 18 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-06-19.

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 18 FT8 messages attributed to JA0VTS as the transmitting token by decoded message structure across 3 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 -2 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-2 dB

Estimated median S/N

Bands

20m · 18

First attributed message: 2026-06-06
Last attributed message: 2026-06-19 20:39 UTC

Observed FT8 message patterns

Attributed sample: 18 messages
Active dates: 3 UTC dates
Estimated median S/N: -2 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 1, strong (≥ -8 dB) 17.

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 JA0VTS in decoded directed-looking exchanges:

E77FN · Bosnia-Herzegovina EA5HEU · Spain ON1DGN · Belgium HB9ELE · Switzerland LA8ENA · Norway PI4DX · Netherlands RJ3T · European Russia RN6MA · European Russia SP5MXZ · Poland YO6LM · Romania

Most frequent locator attributed to JA0VTS

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: PM97 · 3 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,513 km (approx.)
Last such locator decoded: 2026-06-17 19:57 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	JA0VTS S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 19:00	40m	- / -	US2YW	+4 / -	2	Partial capture
09-20 18:56	40m	- / 0	HB9ELE	+9 / -	5	✓ Closing fragment
09-20 18:56	40m	- / -6	SP5MXZ	+5 / -	3	✓ Closing fragment
09-20 18:56	40m	- / +4	PI4DX	+11 / -	2	✓ Closing fragment
09-20 18:56	40m	- / -16	UT9NA	+10 / -	2	Partial capture
09-18 18:32	40m	- / -10	YO6LM	-2 / -	4	✓ Closing fragment
09-18 18:31	40m	- / -12	RN6MA	+6 / -	2	✓ Closing fragment
09-18 18:28	40m	- / +2	YO8DHA	+4 / -	2	Partial capture
09-18 18:24	40m	- / -5	UA4FKT	+8 / -	2	Partial capture
09-18 18:22	40m	- / -9	R4PFY	-17 / -	2	Partial capture
09-18 18:19	40m	- / -	US1CR	-5 / -	6	Partial capture
09-18 18:17	40m	- / -12	LZ2PC	+5 / -	3	Partial capture
09-18 18:16	40m	- / -10	LA8ENA	-6 / -	2	✓ Closing fragment
08-12 17:37	20m	- / -	DL1R	-1 / -	9	Partial capture
08-12 17:34	20m	- / -6	ON1DGN	-16 / -	2	✓ Closing fragment
08-12 17:30	20m	- / -15	EA5HEU	-9 / -	3	✓ Closing fragment
07-06 15:01	20m	- / -16	EA3ADX	-6 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
185615 +12 2194  JA0VTS PI4DX R+04
185645  +3 2771  JA0VTS SP5MXZ -06
185645 +10 2194  JA0VTS PI4DX 73
185645  +8  694  JA0VTS HB9ELE JN47
185715  +8 2187  JA0VTS UT9NA R-16
185715  +5 2770  JA0VTS SP5MXZ -06
185715  +9  694  JA0VTS HB9ELE JN47 (x4)
185915  +6 2766  JA0VTS SP5MXZ RR73
190045  +0 2772  JA0VTS US2YW KN28 (x2)
192815 +11 2767  JA0VTS DL8UVG JO71
192845  -7 2767  JA0VTS RJ3T RR73

20m

UTC    dB Audio  Message
173000 -10 1533  JA0VTS EA5HEU JN00 (x3)
173400 -15 1193  JA0VTS ON1DGN -06 (x2)
173700 -22 1378  JA0VTS E77FN 73
173730  -1 2673  JA0VTS DL1R JN58 (x9)

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