4Z4MU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Israel Most frequent locator attributed to this token: KM71

Receiver-side FT8 activity involving 4Z4MU, decoded by SO8OO in southeastern Poland. 270 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 38 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-09-15.

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 270 FT8 messages attributed to 4Z4MU as the transmitting token by decoded message structure across 38 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (60%), followed by 80 m (39%) and 40 m (1%). The busiest six-hour window was 15:00-21:00 UTC, containing 49% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

270

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 105 40m · 2 20m · 163

First attributed message: 2026-06-10
Last attributed message: 2026-09-15 20:26 UTC

Observed FT8 message patterns

Attributed sample: 270 messages
Active dates: 38 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -20 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 78, moderate (-15 to -9 dB) 114, strong (≥ -8 dB) 78.

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 4Z4MU in decoded directed-looking exchanges:

KE4EB · United States ×2 PI4DX · Netherlands ×2 SP6FME · Poland ×2 RK6MC · European Russia ×2 A61DI · United Arab Emirates BA3QIQ · China CR7BRV · Portugal DH1FA · Fed. Rep. of Germany DL6MRM · Fed. Rep. of Germany EA6Y · Balearic Islands EC3A · Spain EC5M · Spain

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 4Z4MU

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: KM71 · 11 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,325 km (approx.)
Last such locator decoded: 2026-09-15 20:26 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	4Z4MU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 20:25	80m	- / -16	UA3QQG	-4 / -	2	✓ Closing fragment
09-15 20:24	80m	- / -13	9A9N	-1 / -	2	✓ Closing fragment
09-09 17:48	80m	- / -	UA6EC	-8 / -	2	Partial capture
09-05 19:28	80m	- / -9	UT2UB	-3 / -	4	✓ Closing fragment
09-05 19:28	80m	- / -22	OK1YQ	+10 / -	2	Partial capture
09-05 19:25	80m	-11 / -	R7CD	- / -7	3	✓ Closing fragment
09-05 19:24	80m	-3 / -7	UR4LRG	+12 / +2	4	✓ Full exchange observed
09-05 19:22	80m	-7 / -	UA4FOH	+5 / -3	2	✓ Closing observed
08-31 20:14	20m	-9 / -	W1AW/2	- / -16	3	Partial capture
08-31 20:02	20m	-11 / -	W3FOX	- / -10	3	Partial capture
08-31 19:59	20m	-11 / -	CS8ABF	- / -6	2	Partial capture
08-31 05:41	20m	-20 / -	SV1MOZ	+2 / -	6	Partial capture
08-31 05:37	20m	-20 / -	ZL2BX	- / -9	3	✓ Closing fragment
08-30 05:26	20m	-8 / -	KJ8XTA	- / -12	3	Partial capture
08-29 19:47	20m	- / 0	PY1EME	-6 / -	2	✓ Closing fragment
08-29 19:15	20m	-12 / -	KE4EB	- / -5	6	Partial capture
08-28 02:13	80m	- / -	DK5WL	-10 / -	2	Partial capture
08-28 02:11	80m	- / -16	SP6FME	+14 / -	5	✓ Closing fragment
08-28 02:10	80m	- / -	DK8HC	-2 / -	5	Partial capture
08-28 02:10	80m	- / -	MI7XHT	-6 / -	3	Partial capture
08-28 02:08	80m	-9 / -20	DO9BAU	+5 / -9	15	✓ Full exchange observed
08-28 02:06	80m	-6 / -7	OH7LXL	-3 / -	4	✓ Closing observed
08-28 01:47	20m	- / -16	KE1R	+11 / -	2	✓ Closing fragment
08-27 20:35	80m	-17 / -	EA8DO	- / +2	2	Partial capture
08-27 20:32	80m	-20 / -	EA8DO	- / +2	2	Partial capture
08-26 14:48	20m	-8 / -	7X2KF	- / -3	5	Partial capture
08-25 14:44	20m	-6 / -	EA6Y	- / 0	2	✓ Closing fragment
08-25 14:43	20m	-8 / -	VK6KC	- / +1	2	Partial capture
08-25 14:40	20m	-2 / -	VK6KC	- / +1	2	Partial capture
08-24 19:47	20m	- / -2	YO6LM	-2 / -	2	Partial capture
08-24 13:11	20m	-22 / -	XU7O	- / -13	4	Partial capture
08-23 06:16	20m	-18 / -16	N8HRZ	-9 / -7	4	✓ Full exchange observed
08-21 05:38	20m	-8 / -	W4IMD	- / -15	2	Partial capture
08-21 05:36	20m	-12 / -	ZL2NU	- / -8	3	Partial capture
08-21 05:33	20m	-11 / -	S55A	- / -6	2	✓ Closing fragment
08-21 05:28	20m	-11 / -7	UA3RRT	-9 / -9	7	✓ Full exchange observed
08-21 05:23	20m	-10 / -17	KE4EB	+1 / +2	17	✓ Closing observed
08-21 05:20	20m	-4 / -	EB3DIY	- / -22	6	Partial capture
08-21 05:05	20m	-10 / -	KN0BLE	- / -18	4	✓ Closing fragment
08-21 05:01	20m	-3 / -	ZL1BQD	- / -9	5	Partial capture
08-21 05:00	20m	-4 / -	KE4YOG	- / -9	3	✓ Closing fragment
08-21 04:58	20m	-10 / -15	R6LKG	-13 / -2	4	✓ Full exchange observed
08-21 04:54	20m	-7 / -23	VE9JMC	-9 / -16	7	✓ Full exchange observed
08-09 19:52	80m	-18 / -	OE9DGV	- / -16	4	Partial capture
08-09 19:47	80m	- / -	DB100FT	-2 / -	2	Partial capture
08-09 19:47	80m	- / -	MI7XHT	-12 / -	2	Partial capture
08-09 19:47	80m	-16 / -	ER3RR	+6 / +4	3	✓ Closing observed
08-09 19:43	80m	- / -16	DR800WE	+9 / -	2	Partial capture
08-09 19:40	80m	-13 / -14	UA3QNE	-2 / -16	5	✓ Full exchange observed
08-09 19:38	80m	-10 / -12	PI4DX	+8 / -4	3	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
192930  +1 1606  4Z4MU UT2UB R-09 (x2)
174245  +2 2070  4Z4MU SQ3M JO81
174615  +0 1502  4Z4MU RK6MC RR73
174800 -20 1068  UF3T 4Z4MU -14
174845 -10  839  4Z4MU UA6EC LN14 (x2)
175115 -10  479  4Z4MU R3XBV KO84
192000  -8 1314  4Z4MU F4ANC JN25
202300 -13 1663  EA4DL 4Z4MU KM71
202430  -4  620  4Z4MU 9A9N R-13 (x2)
202530  -6 1207  4Z4MU UA3QQG -16 (x2)
202645 -17 2155  JH1IFS 4Z4MU KM71

20m

UTC    dB Audio  Message
054145  +0 1101  4Z4MU SV1MOZ KM17 (x3)
054300 -20 1579  SV1MOZ 4Z4MU +13
054315  +3 1100  4Z4MU SV1MOZ KM17 (x2)
195900  -9 1121  CS8ABF 4Z4MU -06 (x2)
200000 -14 1121  K4ZO 4Z4MU -10
200200 -14 1142  W3FOX 4Z4MU -10 (x3)
201445  -6  730  W1AW/2 4Z4MU -16 (x3)

40m

UTC    dB Audio  Message
193545 -17 1810  4Z4MU F5RRS JN36 (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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