JA7UKM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: QM09

Receiver-side FT8 activity involving JA7UKM, decoded by SO8OO in southeastern Poland. 6 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-08-27 and 2026-08-28.

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 6 FT8 messages attributed to JA7UKM as the transmitting token by decoded message structure across 2 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 -19 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-19 dB

Estimated median S/N

Bands

20m · 6

First attributed message: 2026-08-27
Last attributed message: 2026-08-28 12:59 UTC

Observed FT8 message patterns

Attributed sample: 6 messages
Active dates: 2 UTC dates
Estimated median S/N: -19 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 1, strong (≥ -8 dB) 2.

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 JA7UKM in decoded directed-looking exchanges:

LZ1RAY · Bulgaria OZ7DR · Denmark R3KLE · European Russia R6LQU · European Russia RW6B · European Russia TK5K · Corsica UB8CPH · Asiatic Russia VA3KTT · Canada

Most frequent locator attributed to JA7UKM

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: QM09 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,434 km (approx.)
Last such locator decoded: 2026-08-28 12:58 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	JA7UKM S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 12:59	20m	- / -21	IZ8EYN	+6 / -	4	Partial capture
08-28 12:58	20m	-9 / -	VA3KTT	- / -16	3	✓ Closing fragment
08-28 12:57	20m	- / -	M0LAD	+7 / -	13	Partial capture
08-27 12:13	20m	- / -	PD1ADA	-12 / -	8	Partial capture
08-27 12:05	20m	- / -	DB1BW	-2 / -	3	Partial capture
08-27 12:04	20m	- / -17	R6LQU	-10 / -	2	✓ Closing fragment
08-27 12:03	20m	- / -	PD1ADA	-10 / -	7	Partial capture
08-27 12:01	20m	-24 / -	OZ7DR	-18 / -17	2	✓ Closing observed
08-27 11:58	20m	-24 / -6	R3KLE	+12 / -	3	✓ Closing observed
08-26 11:40	20m	- / -	HB9IOB	-18 / -	3	Partial capture
08-23 12:54	20m	- / -	HB9AUS	+12 / -	2	Partial capture
07-24 10:53	20m	- / -	IW7EAP	-23 / -	5	Partial capture
07-23 12:02	20m	- / -6	TK5K	-2 / -	2	✓ Closing fragment
07-08 12:01	20m	- / -19	LZ1RAY	-2 / -	2	✓ Closing fragment
06-30 12:46	20m	- / -13	RW6B	-20 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
125900  -8 2710  VA3KTT JA7UKM 73
125915  +8  992  JA7UKM IZ8EYN -21
125945  +8 2710  JA7UKM M0LAD JO02
125945  +5  992  JA7UKM IZ8EYN -21
130015 +15 2710  JA7UKM M0LAD JO02 (x2)
130045  +4  992  JA7UKM IZ8EYN -21
130115  +8 2710  JA7UKM M0LAD JO02 (x2)
130145  +5  991  JA7UKM IZ8EYN -21
130215  +8 2710  JA7UKM M0LAD JO02 (x5)

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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