JA7JWF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: QM08

Receiver-side FT8 activity involving JA7JWF, decoded by SO8OO in southeastern Poland. 5 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 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 5 FT8 messages attributed to JA7JWF as the transmitting token by decoded message structure across 1 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 -14 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

20m · 5

First attributed message: 2026-08-28
Last attributed message: 2026-08-28 21:01 UTC

Observed FT8 message patterns

Attributed sample: 5 messages
Active dates: 1 UTC dates
Estimated median S/N: -14 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 3, 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 JA7JWF in decoded directed-looking exchanges:

EA3AKY · Spain ×2 CT2IBL · Portugal F4FSY · France F4IVI · France F5OYC · France HB9XBY · Switzerland RV3QI · European Russia UR4LRG · Ukraine EA6TU · Balearic Islands EA8UP · Canary Islands EB3JT · Spain EC3A · Spain

Most frequent locator attributed to JA7JWF

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: QM08 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,525 km (approx.)
Last such locator decoded: 2026-08-28 21:01 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	JA7JWF S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 19:51	80m	- / -15	RA3GZ	+1 / -	3	✓ Closing fragment
09-01 17:34	80m	- / -11	YO2MAX	+24 / -	4	✓ Closing fragment
08-28 21:15	20m	- / -16	EA6TU	-6 / -	2	✓ Closing fragment
08-28 21:12	20m	- / -9	F4JVF	+7 / -	5	✓ Closing fragment
08-28 21:09	20m	- / -	EB3DBR	+1 / -	2	Partial capture
08-28 21:08	20m	- / -8	EC3A	0 / -	2	✓ Closing fragment
08-28 21:06	20m	- / -11	EA8UP	+20 / -	2	✓ Closing fragment
08-28 21:03	20m	- / -15	<...>	+6 / -	3	✓ Closing fragment
08-28 20:51	20m	-18 / -19	EB3JT	+4 / -	5	✓ Closing observed
08-28 20:50	20m	-12 / -	EP2AES	- / -8	3	✓ Closing fragment
08-27 11:10	10m	- / -13	CT2IBL	0 / -	2	✓ Closing fragment
08-27 10:43	10m	- / -7	F4IVI	-8 / -	3	✓ Closing fragment
08-27 10:34	10m	- / -8	F4FSY	-5 / -	4	Partial capture
08-27 10:27	10m	- / -13	EA3AKY	-8 / -	3	✓ Closing fragment
08-27 09:35	10m	- / -11	EA3AKY	-12 / -	2	Partial capture
08-27 09:31	10m	- / -20	F5OYC	-9 / -	3	✓ Closing fragment
08-24 20:41	40m	- / -20	ON4IQ	+14 / -	5	✓ Closing fragment
08-24 20:38	40m	- / -12	RN2F	+3 / -	5	Partial capture
08-24 20:29	40m	- / -	YO3HPC/P	-8 / -	4	Partial capture
06-28 12:18	10m	- / -	RV3QI	-8 / -	3	✓ Closing fragment
06-28 11:34	10m	- / -17	UR4LRG	+14 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
173400 +28  624  JA7JWF YO2MAX KN15 (x4)
195100  -3  791  JA7JWF RA3GZ -15 (x3)

20m

UTC    dB Audio  Message
210430  +7  377  JA7JWF <...> 73
210615 +20  407  JA7JWF EA8UP -11 (x2)
210815  -1  584  JA7JWF EC3A -08 (x2)
210945  +3  496  JA7JWF EB3DBR JN11
211015 -18 1654  JA7JWF F4IBJ R-15
211015  -1  495  JA7JWF EB3DBR JN11
211215  +3  913  JA7JWF F4JVF IN95 (x5)
211515  -8 1877  JA7JWF EA6TU -16 (x2)

10m

UTC    dB Audio  Message
102745  -8 1222  JA7JWF EA3AKY -13 (x3)
103445 -10 1841  JA7JWF F4FSY -08 (x5)
104145 -14  702  JA7JWF HB9XBY RR73
104315  -9  389  JA7JWF F4IVI -07
104400  -7 2747  JA7JWF EA3FCQ JN01
104430  -5  334  JA7JWF F4IVI -17 (x2)
111045  -3 2125  JA7JWF CT2IBL -13 (x2)

40m

UTC    dB Audio  Message
202900  +1  639  JA7JWF YO3HPC/P KN44 (x4)
203830  +7 2364  JA7JWF RN2F -12 (x5)
204100 +14 2260  JA7JWF ON4IQ JO20 (x5)
204430  -4 2364  JA7JWF RN2F RR73

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