JA4DWG — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving JA4DWG, decoded by SO8OO in southeastern Poland. 16 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-07-17 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 16 FT8 messages attributed to JA4DWG 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 -18 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-18 dB

Estimated median S/N

Bands

20m · 16

First attributed message: 2026-07-17
Last attributed message: 2026-08-28 20:55 UTC

Observed FT8 message patterns

Attributed sample: 16 messages
Active dates: 3 UTC dates
Estimated median S/N: -18 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 14, moderate (-15 to -9 dB) 2, 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 JA4DWG in decoded directed-looking exchanges:

BD7PWV · China BG4OOO · China EA8AOC · Canary Islands F4IBJ · France F4JVF · France ON7NQ · Belgium Z33ST · North Macedonia UR1CCT · Ukraine

Most frequent locator attributed to JA4DWG

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 · 7 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,453 km (approx.)
Last such locator decoded: 2026-08-27 22:13 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	JA4DWG S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 20:55	20m	-23 / -9	F4JVF	+7 / -5	3	✓ Full exchange observed
08-28 20:52	20m	- / -	F4JVF	+7 / -	2	Partial capture
08-28 20:51	20m	- / -19	F1SZC	+13 / -	7	Partial capture
08-28 20:50	20m	-23 / -16	F4IBJ	+9 / -4	7	✓ Full exchange observed
08-27 22:14	20m	-18 / -	BD7PWV	- / -15	3	✓ Closing fragment
08-27 22:10	20m	-18 / -	EA8AOC	- / -7	3	✓ Closing fragment
08-27 21:37	20m	-15 / -	EA8DGI	- / -	3	Partial capture
08-27 21:25	40m	- / -8	UR1CCT	+16 / -	3	✓ Closing fragment
08-21 20:48	20m	- / -2	R3ZBR	-4 / -	2	Partial capture
08-21 20:47	20m	- / -	IW3BYL	-14 / -	2	Partial capture
08-21 20:47	20m	- / -3	UB6D	-20 / -	2	Partial capture
08-12 21:20	20m	- / -20	ON7NQ	+5 / -	5	✓ Closing fragment
07-29 20:05	20m	- / -18	EA8UP	-1 / -	7	Partial capture
07-17 22:17	20m	-21 / -	TF3VS	- / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
205230 +10 1418  JA4DWG F4IBJ R-16
205230 +13 2442  JA4DWG F1SZC IN95
205245 -23 1801  F4IBJ JA4DWG -04
205300 +10 1801  JA4DWG F4JVF IN95
205300  +8 1418  JA4DWG F4IBJ R-16
205300 +14 2442  JA4DWG F1SZC IN95
205330 +11 1418  JA4DWG F4IBJ R-16
205330 +14 2442  JA4DWG F1SZC IN95 (x2)
205430  +8 1418  JA4DWG F4IBJ 73
205430 +13 2442  JA4DWG F1SZC R-19
205515 -23 1801  F4JVF JA4DWG -05
205530 +10 1801  JA4DWG F4JVF R-09 (x2)
205700 -14 1801  JA4DWG F4MUF JN05

40m

UTC    dB Audio  Message
212530 +16  633  JA4DWG UR1CCT KN69 (x3)

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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