4Z4DX — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Israel Most frequent locator attributed to this token: KM72

Receiver-side FT8 activity involving 4Z4DX, decoded by SO8OO in southeastern Poland. 541 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 66 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-19.

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 541 FT8 messages attributed to 4Z4DX as the transmitting token by decoded message structure across 66 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (63%), followed by 40 m (20%) and 80 m (10%). Most decodes (51%) fell within the six-hour window 00:00-06:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13.2 dB.

Overview

541

Messages attributed

UTC dates decoded

172

Active 15-min windows

-13.2 dB

Estimated median S/N

Bands

80m · 52 60m · 42 40m · 107 20m · 339 10m · 1

First attributed message: 2026-06-06
Last attributed message: 2026-09-19 03:50 UTC

Observed FT8 message patterns

Attributed sample: 541 messages
Active dates: 66 UTC dates
Estimated median S/N: -13.2 dB
Estimated 10th-90th percentile: -21 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 205, moderate (-15 to -9 dB) 189, strong (≥ -8 dB) 147.

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 4Z4DX in decoded directed-looking exchanges:

Z62NS · Republic of Kosovo ×3 TA7D · Asiatic Turkey ×2 YO3AUM · Romania ×2 EX7CQ · Kyrgyzstan ×2 LY8O · Lithuania ×2 SX0W · Greece 7Z1FF · Saudi Arabia A61QQ · United Arab Emirates A61SD · United Arab Emirates BG5WDR · China BY6SX · China CR2WWA · Azores

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 4Z4DX

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: KM72 · 340 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 2,224 km (approx.)
Last such locator decoded: 2026-09-19 03:50 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	4Z4DX S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 03:21	80m	- / -21	SQ100PKP	-3 / -	3	Partial capture
09-18 20:03	40m	0 / -	TA3NK	- / -	3	Partial capture
09-18 02:14	80m	- / -17	ER3ZW	+14 / -	2	Partial capture
09-18 02:12	80m	- / -18	ON1JP	-18 / -	4	Partial capture
09-18 02:09	80m	-18 / -17	RA2FCF	+4 / -5	6	✓ Full exchange observed
09-18 02:03	80m	- / -17	A65BR	-20 / -	2	✓ Closing fragment
09-15 01:03	60m	-20 / -	LA9JKA	-8 / -6	10	✓ Closing observed
09-15 01:02	60m	-11 / -12	PE1MHY	0 / -19	5	✓ Full exchange observed
09-12 03:03	80m	-16 / -12	DO4EB	+4 / -14	5	✓ Full exchange observed
09-12 03:01	80m	-24 / -9	IZ2AMW	+1 / -15	4	✓ Full exchange observed
09-12 02:43	60m	- / -7	PA4PA	+5 / -	2	✓ Closing fragment
09-12 02:29	40m	-20 / -17	EX7CQ	-10 / -23	7	✓ Full exchange observed
09-10 20:46	40m	-18 / -	R6ODX	- / -	2	Partial capture
09-10 20:44	80m	-14 / -	RV5K	+16 / -	2	✓ Closing observed
09-09 20:48	40m	- / -11	SV8/F2VX	-2 / -	3	Partial capture
09-09 20:46	60m	- / -15	OR0A	-4 / -	4	Partial capture
09-09 00:57	40m	-8 / -	SV8/F6BLP	- / +6	2	Partial capture
09-09 00:49	80m	-22 / -	UK8FCM	- / -	2	Partial capture
09-09 00:48	80m	-15 / -	DL3MIB	+8 / -3	11	✓ Full exchange observed
09-09 00:47	80m	-22 / -14	Z62NS	+10 / -	3	✓ Closing observed
09-09 00:45	80m	-18 / -15	SM7/DL5BTE	+12 / -1	2	Partial capture
09-07 17:41	40m	-16 / -	SP100PKP	- / -	2	Partial capture
09-07 17:34	40m	-22 / -	SO100PKP	- / -10	4	Partial capture
09-07 17:15	40m	- / -19	EI6JMB	-10 / -	3	Partial capture
09-07 17:06	40m	-7 / -	3Z0SYBIR	- / -	3	Partial capture
09-07 16:50	40m	-16 / -	RG6OR	- / -	2	Partial capture
09-07 03:13	80m	-20 / -	K9US	- / -	2	Partial capture
09-07 03:10	60m	-21 / -19	IS0BOY	-16 / -	4	✓ Closing observed
09-05 22:37	80m	- / -24	OU7M/P	+8 / -	4	✓ Closing fragment
09-05 22:35	80m	- / -17	II0CDS	-8 / -	4	Partial capture
09-05 22:24	40m	-8 / -17	MW9LQA	-4 / -19	6	✓ Full exchange observed
09-05 22:23	40m	- / -14	OU7K/P	+3 / -	2	✓ Closing fragment
09-05 22:17	40m	-20 / -	3Z100PKP	- / -7	4	Partial capture
09-05 22:13	80m	-16 / -15	3Z25POT	+7 / -	2	Partial capture
09-05 22:12	80m	-20 / -	OU7M/P	- / -	2	Partial capture
09-05 22:05	60m	-16 / -20	OH3GKA	0 / -23	9	✓ Full exchange observed
09-05 16:40	40m	- / -18	SP1FM/P	-9 / -	2	Partial capture
09-05 02:02	40m	-14 / -	OH2NAG	- / -5	2	✓ Closing fragment
09-05 02:01	40m	-13 / -	M6WRB	- / -	2	Partial capture
09-05 01:57	40m	-11 / -18	SO100PKP	-14 / -5	3	Partial capture
09-05 01:56	40m	-17 / -	OM1DLC/P	- / -8	4	Partial capture
09-05 01:51	40m	-12 / -	K1LNF	- / -	2	Partial capture
09-05 01:42	40m	- / -12	RC9WC	-10 / -	3	✓ Closing fragment
09-05 01:33	40m	-9 / -	RJ6ON	- / -7	3	✓ Closing fragment
09-05 01:23	80m	- / -20	EW8AAC	+6 / -	2	✓ Closing fragment
09-05 01:15	60m	-17 / -	SP7ICE	- / -11	2	✓ Closing fragment
09-03 16:32	40m	-12 / -17	3Z0L	0 / -	4	Partial capture
09-02 23:41	80m	-20 / -11	IR7MGGC	-5 / -	4	Partial capture
08-31 06:03	20m	-17 / -	<...>	- / -	3	Partial capture
08-31 03:00	20m	- / -21	A61SD	-13 / -	5	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
010245 -12 1182  PE1MHY 4Z4DX R-19
010300  -2  814  4Z4DX PE1MHY RR73
010300  -4 1627  4Z4DX LA9JKA JP32
010315 -10  814  PE1MHY 4Z4DX 73
010330  -2 1627  4Z4DX LA9JKA JP32 (x2)
010415 -23 1626  LA9JKA 4Z4DX -06
010430  -7 1627  4Z4DX LA9JKA JP32 (x2)
010515 -19 1626  LA9JKA 4Z4DX -10
010530 -12 1627  4Z4DX LA9JKA JP32
010545 -20 1626  LA9JKA 4Z4DX -12 (x2)
035000  +9  528  4Z4DX F6ICX -20
035045 -18 1024  8R1TM 4Z4DX KM72

80m

UTC    dB Audio  Message
021100 -24 1453  RA2FCF 4Z4DX R-03
021115  +4 1452  4Z4DX RA2FCF RR73
021130 -13 1453  RA2FCF 4Z4DX 73 (x2)
021245 -19 1829  4Z4DX ON1JP -18 (x4)
021445 +14 1958  4Z4DX ER3ZW -17 (x2)
031800  -3 1209  4Z4DX SP100PKP -20
032015 -18 1073  SN40KZE 4Z4DX KM72
032100  -2 1501  4Z4DX SQ100PKP -21 (x3)

40m

UTC    dB Audio  Message
023000 -12 1716  4Z4DX EX7CQ RR73 (x2)
023045 -22 1714  EX7CQ 4Z4DX 73
025430  -8 1534  4Z4DX EH3ST +04
011245 -19 1239  N4NF 4Z4DX KM72
011345 -15  733  SM/DB9LG 4Z4DX KM72
011500  +4 1279  4Z4DX II8IHBC -12
012045 -11  638  RN3YN 4Z4DX R-13
012315 -11  478  KN6RO 4Z4DX KM72
015445 -22 1703  9K2WA 4Z4DX R-02
015630 -14  737  N1NRL 4Z4DX KM72
015700 -24 1540  K8DID 4Z4DX KM72
200345  +0 1168  TA3NK 4Z4DX KM72 (x3)

20m

UTC    dB Audio  Message
172545  -6  951  4Z4DX M7VME -17 (x3)
150915 -18 1388  CT1END/P 4Z4DX KM72 (x2)
083430 -17  635  4Z4DX 8Z1IT -07
030015 -13  885  4Z4DX A61SD -21 (x5)
060330 -17 1579  <...> 4Z4DX KM72 (x3)
122830 -19 1509  IU4SQE 4Z4DX KM72

10m

UTC    dB Audio  Message
093200  +1  695  4Z4DX SX0W +00 (x2)
062700  -9 2438  4Z4DX DN9OPA JN38 (x2)
085600 -13 1879  4Z4DX II7MGMU -12

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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