JM3UGA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM74

Receiver-side FT8 activity involving JM3UGA, decoded by SO8OO in southeastern Poland. 26 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-08-01 and 2026-09-21.

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 26 FT8 messages attributed to JM3UGA as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (54%), followed by 20 m (46%). Most decodes (73%) fell within the six-hour window 16:00-22:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's moderate S/N range (73%); the estimated median was -11 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

40m · 14 20m · 12

First attributed message: 2026-08-01
Last attributed message: 2026-09-21 16:20 UTC

Observed FT8 message patterns

Attributed sample: 26 messages
Active dates: 3 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -22 to -7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 4.

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.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with JM3UGA in decoded directed-looking exchanges:

EA8UP · Canary Islands PI4DX · Netherlands CT1FIU · Portugal F4IBJ · France F4NGR · France IS0KNG · Sardinia IV3DSG · Italy KC5OCH · United States NE9U · United States US5HL · Ukraine 9A3EYA · Croatia 9A4ZM · Croatia

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to JM3UGA

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: PM74 · 6 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,565 km (approx.)
Last such locator decoded: 2026-09-21 16:20 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	JM3UGA S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 16:35	40m	- / -	UT9NA	-22 / -	3	Partial capture
09-21 16:17	40m	- / -	SP3GHC	+2 / -	2	Partial capture
09-12 21:48	40m	- / -	RD6OZ	0 / -	2	Partial capture
09-12 21:07	40m	- / -	SV1DKR	-9 / -	5	Partial capture
09-12 21:05	40m	- / -	R3LCG	-1 / -	3	Partial capture
09-12 21:05	40m	- / -	SM/DB9LG	-13 / -	2	Partial capture
09-12 21:05	40m	- / -	DL1SRS	-10 / -	2	Partial capture
09-05 21:52	40m	- / -10	EX7CQ	-1 / -	2	✓ Closing fragment
09-05 21:18	40m	- / -	RD7O	+2 / -	3	Partial capture
09-05 21:17	40m	- / -	R2BNC	-4 / -	2	Partial capture
08-22 21:33	20m	-14 / -	BI1AFK	- / -3	2	Partial capture
08-22 21:32	20m	- / -13	US5HL	+8 / -	2	✓ Closing fragment
08-22 21:09	40m	-11 / -	TN8GD	- / -16	3	✓ Closing fragment
08-22 21:02	40m	-12 / -16	9A4ZM	+3 / -17	5	✓ Full exchange observed
08-22 21:01	40m	- / -9	DK7ZT	-5 / -	2	Partial capture
08-22 21:00	40m	-9 / -	SV3AUW	-14 / -16	2	✓ Closing observed
08-22 20:56	40m	- / -	UF5F	-3 / -	3	Partial capture
08-22 20:55	40m	- / -	RA6FYL	-10 / -	2	Partial capture
08-22 20:54	40m	-10 / -15	9A3EYA	+6 / -15	3	✓ Full exchange observed
08-22 20:54	40m	- / -	OK1SI	+10 / -	2	Partial capture
08-22 20:53	40m	- / -	LZ3CB	-2 / -	3	Partial capture
08-22 20:53	40m	- / -5	RN6HK	+9 / -	5	✓ Closing fragment
08-22 20:53	40m	- / -	DL1ESZ	-13 / -	3	Partial capture
08-22 13:26	20m	-6 / -	NE9U	- / -13	2	✓ Closing fragment
08-22 13:24	20m	-8 / -	KC5OCH	- / -10	4	✓ Closing fragment
08-22 13:24	20m	- / -	R7OV	-5 / -	2	Partial capture
08-01 21:26	40m	- / -	UR5SD	-3 / -	2	Partial capture
08-01 19:55	20m	- / -	EA3IXD	-16 / -	3	Partial capture
08-01 19:55	20m	- / -	PD1ADA	0 / -	9	Partial capture
08-01 19:54	20m	-23 / -3	F4NGR	-10 / -	4	✓ Closing observed
08-01 19:51	20m	- / 0	F4IBJ	-8 / -	5	✓ Closing fragment
08-01 19:51	20m	- / -13	IS0KNG	-10 / -	2	✓ Closing fragment
08-01 19:49	20m	- / -	IK5EEA	-7 / -	4	Partial capture
08-01 19:49	20m	- / -	IU2RGL	-12 / -	2	Partial capture
08-01 19:49	20m	- / +2	IV3DSG	-1 / -	4	✓ Closing fragment
08-01 11:37	20m	- / -	ON4AZR	+4 / -	2	Partial capture
07-25 10:44	10m	- / -	IW2HUS	-17 / -	6	Partial capture
07-25 10:43	10m	- / -10	PI4DX	-4 / -	2	✓ Closing fragment
06-27 10:47	10m	- / -	RV3QI	-22 / -	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
210700 -10  532  JM3UGA SM/DB9LG
210700 -24 1648  JM3UGA HG8LXL KN06
210730 -19 1269  JM3UGA UX5UO KO50
210730  -9 1844  JM3UGA SV1DKR KM18 (x4)
214800  +1 1675  JM3UGA RD6OZ KN98 (x2)
161700  +1 1348  JM3UGA SP3GHC JO82 (x2)
162045 -12 1001  RI1FJZ JM3UGA PM74
163530 -23 2187  JM3UGA UT9NA KN49 (x3)

20m

UTC    dB Audio  Message
132400  +0 2624  JM3UGA R7OV KN87
132415  -9 2624  KC5OCH JM3UGA -10
132430 -10 2624  JM3UGA R7OV KN87
132445  -9 2623  KC5OCH JM3UGA RR73
132500  +2 2624  JM3UGA DL2VER JN49
132515  -6 2624  KC5OCH JM3UGA RR73
132530  -2 2623  JM3UGA DH1FH JN48
132545  -9 2625  KC5OCH JM3UGA RR73
132615  -7 2624  NE9U JM3UGA -13 (x2)
213200  +9 2583  JM3UGA US5HL -13 (x2)
213315 -15 1290  BI1AFK JM3UGA -03 (x2)
213530  -7 1765  JM3UGA EA7EZ IM76

10m

UTC    dB Audio  Message
082630 -17 2095  JM3UGA R6DZL LN04
104730 -20 2070  JM3UGA RV3QI KO91 (x2)
072430 -11 1714  JM3UGA IZ4OSH JN54
104315  -5  985  JM3UGA PI4DX -10 (x2)
104415 -17 1467  JM3UGA IW2HUS JN45 (x6)
214345 -21 1780  JM3UGA EA8UP RR73

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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