JM4WUZ — 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: PM64

Receiver-side FT8 activity involving JM4WUZ, decoded by SO8OO in southeastern Poland. 7 FT8 messages attributed to this token as transmitter, on 20m, across 1 UTC dates in the available aggregate history. Last observed 2026-07-18.

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 7 FT8 messages attributed to JM4WUZ 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 · 7

First attributed message: 2026-07-18
Last attributed message: 2026-07-18 21:19 UTC

Observed FT8 message patterns

Attributed sample: 7 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) 1, moderate (-15 to -9 dB) 6, 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 JM4WUZ in decoded directed-looking exchanges:

CU2AP · Azores ON4IQ · Belgium 4J3DJ · Azerbaijan YU1LD · Serbia HZ1SK · Saudi Arabia KI2X · United States ON5LW · Belgium SV8JE · Greece UN8DSW · Kazakhstan

Most frequent locator attributed to JM4WUZ

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
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,453 km (approx.)
Last such locator decoded: 2026-07-18 21:16 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	JM4WUZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-02 20:29	160m	- / -	SP5EXA	+8 / -	4	Partial capture
10-17 21:07	160m	- / -18	4J3DJ	-9 / -	4	✓ Closing fragment
10-17 20:23	80m	- / -	LZ1GC	+6 / -	3	Partial capture
10-17 20:20	80m	- / -23	UX5UO	+5 / -	9	Partial capture
10-17 20:20	80m	- / -	OH5KNL	+10 / -	3	Partial capture
10-09 19:01	80m	- / -	RN3TT	+3 / -	3	Partial capture
10-09 18:43	160m	- / -15	YU1LD	+13 / -	5	✓ Closing fragment
10-09 18:23	80m	- / 0	LZ2XA	+7 / -	2	Partial capture
09-22 21:44	40m	- / -21	ON5LW	+4 / -	2	✓ Closing fragment
09-22 21:42	40m	- / -	HB9ELE	+8 / -	4	Partial capture
09-22 21:39	40m	- / -21	TF4M	-5 / -	2	Partial capture
09-22 21:32	40m	- / -	RT6Z	+11 / -	3	Partial capture
08-29 20:06	80m	- / -18	SV8JE	+4 / -	4	✓ Closing fragment
08-29 20:00	80m	- / -9	UN8DSW	-14 / -	2	✓ Closing fragment
08-28 09:56	10m	- / -13	CU2AP	-16 / -	2	✓ Closing fragment
08-28 07:45	10m	- / -14	ON4IQ	+13 / -	3	✓ Closing fragment
08-22 19:48	80m	- / -22	R7CD	+4 / -	3	Partial capture
08-21 21:53	20m	- / -19	HZ1SK	-13 / -	4	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
205330  +9 2794  JM4WUZ OH5LF -18
184330 +13  758  JM4WUZ YU1LD KN04 (x5)
210700  -9  319  JM4WUZ 4J3DJ R-18 (x4)
202900 +14 1441  JM4WUZ SP5EXA KO02 (x4)

80m

UTC    dB Audio  Message
202045  +0 1686  JM4WUZ UX5UO KO50
202045 +13 2255  JM4WUZ OH5KNL KP30
202115  +4 1686  JM4WUZ UX5UO KO50
202115 +12 2255  JM4WUZ OH5KNL KP30
202215  +1 1687  JM4WUZ UX5UO KO50
202215 -13 1212  JM4WUZ RX3DTN KO85
202245  +8 1687  JM4WUZ UX5UO KO50 (x2)
202315  +6 1025  JM4WUZ LZ1GC KN22
202345  +6 1687  JM4WUZ UX5UO KO50
202345  +4 1025  JM4WUZ LZ1GC KN22
202415 +10 1687  JM4WUZ UX5UO KO50
202415  +8 1025  JM4WUZ LZ1GC KN22
202445  +9 1687  JM4WUZ UX5UO KO50 (x2)

40m

UTC    dB Audio  Message
213200 +13 2966  JM4WUZ RT6Z KN98 (x3)
213930  -5 2303  JM4WUZ TF4M R-21 (x2)
214230  +9 1095  JM4WUZ HB9ELE JN47 (x3)
214430  +4 1110  JM4WUZ ON5LW -21
214430  +7 1095  JM4WUZ HB9ELE JN47
214500  +4 1110  JM4WUZ ON5LW RR73
220315 -20 1775  JM4WUZ EY7BM -16

10m

UTC    dB Audio  Message
074515 +12 2664  JM4WUZ ON4IQ JO20 (x3)
095600 -14 1739  JM4WUZ CU2AP R-13 (x2)

20m

UTC    dB Audio  Message
132745 -22 1236  JM4WUZ R3KLA KO90
215300 -14 1940  JM4WUZ HZ1SK R-19 (x4)
085900 -20 2539  JM4WUZ KI2X RR73

CW

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

Explore CW reception at SO8OO

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