JA9ESZ — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM86

Receiver-side FT8 activity involving JA9ESZ, decoded by SO8OO in southeastern Poland. 28 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-15 and 2026-10-18.

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 28 FT8 messages attributed to JA9ESZ 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 (82%), followed by 40 m (18%). In this small sample, the estimated median decoder S/N was -1 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-1 dB

Estimated median S/N

Bands

80m · 23 40m · 5

First attributed message: 2026-09-15
Last attributed message: 2026-10-18 20:46 UTC

Observed FT8 message patterns

Attributed sample: 28 messages
Active dates: 2 UTC dates
Estimated median S/N: -1 dB
Estimated 10th-90th percentile: -8 to +5 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 0, strong (≥ -8 dB) 26.

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 JA9ESZ in decoded directed-looking exchanges:

F5NBU · France ON6AA · Belgium ON8DM · Belgium OT7K · Belgium TF4M · Iceland

Most frequent locator attributed to JA9ESZ

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: PM86 · 18 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,497 km (approx.)
Last such locator decoded: 2026-10-18 20:46 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	JA9ESZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-18 20:45	80m	-5 / -	EA6Y	- / -	2	Partial capture
10-18 20:27	80m	+2 / -5	F5NBU	+6 / -6	11	✓ Full exchange observed
10-18 20:21	80m	-4 / -11	OT7K	+8 / -1	6	✓ Full exchange observed
10-18 20:18	80m	-2 / -14	ON8DM	+8 / -10	4	✓ Full exchange observed
10-18 20:16	80m	+5 / -	9A4ZM	+8 / -14	3	Partial capture
10-18 20:13	80m	0 / -	ON6AA	- / -5	6	✓ Closing fragment
10-02 20:42	80m	- / -14	TF4M	-4 / -	2	✓ Closing fragment
09-15 21:02	40m	- / -10	DK7ZT	-24 / -	2	Partial capture
09-15 20:56	40m	-18 / -	TJ1GD	- / -	2	Partial capture
09-15 20:50	40m	- / -	PD1EN	-4 / -	4	Partial capture
09-15 20:48	40m	- / -	DJ0MDC	-3 / -	4	Partial capture
09-15 20:46	40m	-4 / -	TJ1GD	- / -	3	Partial capture
08-31 17:29	80m	- / -	SV1BLD	+6 / -	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
202245  -5 2991  OT7K JA9ESZ 73
202745  +5 2990  F5NBU JA9ESZ PM86 (x4)
203130  +4  544  JA9ESZ F5NBU -05
203145  +5 2991  F5NBU JA9ESZ R-06
203200  +6  544  JA9ESZ F5NBU RR73
203215  -1 2990  F5NBU JA9ESZ R-06 (x3)
203330  +9  544  JA9ESZ F5NBU RR73
204545  -8 2991  EA6Y JA9ESZ PM86 (x2)
205345 -11 2823  JA9ESZ JR8BRK +00

40m

UTC    dB Audio  Message
204645  -5 2971  TJ1GD JA9ESZ PM86 (x2)
204830  -7 2761  JA9ESZ DJ0MDC JN58
204845  +0 2971  TJ1GD JA9ESZ PM86
204900  -5 2911  JA9ESZ DJ0MDC JN58 (x2)
205000  -8 1643  JA9ESZ PD1EN JO32
205000  +1 2911  JA9ESZ DJ0MDC JN58
205030  -3 1643  JA9ESZ PD1EN JO32 (x3)
205645 -21 2052  TJ1GD JA9ESZ PM86 (x2)
210230 -23 1906  JA9ESZ DK7ZT -10 (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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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