ZL4KX — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: New Zealand Most frequent locator attributed to this token: RE54

Receiver-side FT8 activity involving ZL4KX, decoded by SO8OO in southeastern Poland. 260 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 29 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-03.

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 260 FT8 messages attributed to ZL4KX as the transmitting token by decoded message structure across 29 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (63%), followed by 80 m (30%) and 40 m (6%). Most decodes (58%) fell within the six-hour window 20:00-02:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

260

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

80m · 77 40m · 15 20m · 165 10m · 3

First attributed message: 2026-06-06
Last attributed message: 2026-10-03 06:00 UTC

Observed FT8 message patterns

Attributed sample: 260 messages
Active dates: 29 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -18 to -1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 44, moderate (-15 to -9 dB) 126, strong (≥ -8 dB) 90.

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 ZL4KX in decoded directed-looking exchanges:

DL2TOS · Fed. Rep. of Germany DO7BE · Fed. Rep. of Germany SP2TQQ · Poland EA5FQ · Spain EY35S · Tajikistan IT9FEG · Sicily IT9LCC · Sicily KT3S · United States M9WHQ · England OM2GM · Slovak Republic ON7PS · Belgium T77BL · San Marino

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 ZL4KX

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: RE54 · 113 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 17,677 km (approx.)
Last such locator decoded: 2026-09-16 05:55 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	ZL4KX S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-07 06:49	80m	- / -7	G0OIL	-5 / -	4	✓ Closing fragment
10-03 08:34	40m	- / -	G4DBW	-17 / -	3	Partial capture
10-03 06:16	80m	- / -19	ON6YX	-12 / -	5	✓ Closing fragment
10-03 06:15	80m	- / -	DB3OI	-5 / -	3	Partial capture
10-03 06:12	80m	- / -13	LA9GX	0 / -	5	✓ Closing fragment
10-03 06:11	80m	- / -	DO1OAS	-4 / -	12	Partial capture
10-03 06:07	80m	- / -16	DO9BAU	+6 / -	8	✓ Closing fragment
10-03 06:03	80m	- / -15	DO4DXA	+8 / -	5	✓ Closing fragment
10-03 05:59	80m	- / -17	DO7DE	-8 / -	6	✓ Closing fragment
10-03 05:59	80m	-15 / -8	DF2UU	+7 / +4	6	✓ Full exchange observed
10-03 05:56	80m	- / -22	IZ2EWN	-14 / -	4	Partial capture
10-03 05:52	80m	- / -14	DK6XY	+13 / -	6	✓ Closing fragment
10-03 05:52	80m	- / -22	DK1HZ	+6 / -	5	✓ Closing fragment
10-03 05:50	80m	- / -24	SP1MGM	+8 / -	2	✓ Closing fragment
09-25 07:02	40m	- / -	F6DZU	-5 / -	3	Partial capture
09-25 07:02	40m	- / -	I0KMJ	-4 / -	2	Partial capture
09-25 06:59	40m	- / -	I0KMJ	-3 / -	2	Partial capture
09-24 06:48	80m	- / -	DL6SAK	-15 / -	3	Partial capture
09-24 06:44	80m	- / -	DF2AJ	-9 / -	2	Partial capture
09-16 06:26	80m	- / -17	DF7EF	+4 / -	5	✓ Closing fragment
09-16 06:26	80m	- / -	LA1AAA	-8 / -	2	Partial capture
09-16 06:19	80m	- / -16	DH9DR	-6 / -	6	✓ Closing fragment
09-16 06:17	80m	- / -15	HB9BUN	-5 / -	6	✓ Closing fragment
09-16 06:16	80m	- / -14	DL5EBS	-17 / -	3	✓ Closing fragment
09-16 06:13	40m	- / -	F5OYA/P	-14 / -	2	Partial capture
09-16 06:10	40m	- / -	F5OYA/P	-18 / -	2	Partial capture
09-16 06:06	80m	- / -20	F4EGM	-11 / -	4	✓ Closing fragment
09-16 06:05	80m	- / -14	PA4PA	-4 / -	4	✓ Closing fragment
09-16 05:56	40m	- / -1	S54E	+8 / -	3	Partial capture
09-16 05:55	40m	- / -	RA3LDP	+6 / -	2	Partial capture
09-16 05:55	40m	-7 / -	CT7AXN	- / -	3	✓ Closing fragment
09-14 06:24	60m	- / -25	HB9ACA	-22 / -	2	Partial capture
09-06 07:04	40m	- / -	PA2RO	-14 / -	4	Partial capture
09-06 06:26	80m	- / -	G4BWP	+2 / -	3	Partial capture
09-06 05:34	60m	- / -	G3SHK	-8 / -	2	✓ Closing fragment
09-06 05:32	60m	- / -20	F5OZC	-14 / -	2	✓ Closing fragment
09-03 06:24	40m	- / -5	ON5RZ	-8 / -	4	✓ Closing fragment
09-03 05:02	40m	- / -	PA3KUS	-11 / -	2	Partial capture
09-03 04:58	40m	- / -	OK1MOW	+5 / -	7	Partial capture
09-03 04:58	40m	- / -	IZ3ATV	+10 / -	2	Partial capture
09-03 04:56	40m	-23 / -	HK0RMR	- / -	2	Partial capture
09-03 04:53	40m	- / -	PD5MJF	-16 / -	5	Partial capture
09-03 04:52	40m	- / -	DM2SP	+2 / -	10	Partial capture
08-31 03:56	20m	- / -	4L7T	+2 / -	3	Partial capture
08-31 03:56	20m	- / -	RW9WT	+6 / -	2	Partial capture
08-31 03:55	20m	- / -	EY35S	-4 / -	2	✓ Closing fragment
08-31 03:55	20m	- / -	RK4H	-6 / -	2	Partial capture
08-31 03:54	20m	- / -	R6FY	+9 / -	5	Partial capture
08-31 03:51	20m	- / -	RA6FSV	-4 / -	2	Partial capture
08-31 03:50	20m	- / -	RK4H	-6 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
061545  -6  690  ZL4KX DO1OAS JO51
061545  -4 2177  ZL4KX DB3OI JO52
061615 -10  371  ZL4KX ON6YX JO10
061615  -1  690  ZL4KX DO1OAS JO51
061615  -2 2177  ZL4KX DB3OI JO52
061645  -4  690  ZL4KX DO1OAS JO51
061745 -17  372  ZL4KX ON6YX JO10 (x4)
061600 -17 1324  ZL4KX F4LVE JN25
064930  -4  435  ZL4KX G0OIL JO03 (x4)

40m

UTC    dB Audio  Message
061315 -16  241  ZL4KX F5OYA/P JN13 (x2)
065730  -9 2563  ZL4KX M0WID IO91
065900  -1 2363  ZL4KX I0KMJ JN62
065930 -15  243  ZL4KX OZ1KZX R-14
065930  -5 2363  ZL4KX I0KMJ JN62 (x2)
070230  -7 2563  ZL4KX F6DZU IN94
070300  -4 2363  ZL4KX I0KMJ JN62
070300  -4 2563  ZL4KX F6DZU IN94 (x2)
083130 -24 1790  ZL4KX M0MLS IO92
083400 -17 2312  ZL4KX G4DBW JO01 (x3)

60m

UTC    dB Audio  Message
053715 +12 2738  ZL4KX IZ2DVI JN45 (x3)
054230  +3  526  ZL4KX PG0DX -11 (x3)
053230 -13 1194  ZL4KX F5OZC -20 (x2)
053400  -7  434  ZL4KX G3SHK IO90 (x2)
062400 -22 2040  ZL4KX HB9ACA -25 (x2)

20m

UTC    dB Audio  Message
035445 +13 2485  ZL4KX R6FY LN05 (x2)
035515  -2  466  ZL4KX <...> -15
035545  -8 1074  ZL4KX RK4H LO53
035545  +9 2485  ZL4KX R6FY LN05
035545  -5  465  <ZL4KX> EY35S RR73
035615  +3  560  ZL4KX RW9WT LO64
035615  -3 1074  ZL4KX RK4H LO53
035615  +7 2485  ZL4KX R6FY LN05
035645 +10  560  ZL4KX RW9WT LO64
035645  -3  464  ZL4KX EY35S RR73
035645  -1  319  ZL4KX 4L7T LN21
035745  +2 3012  ZL4KX R4RM LO55
035745  +0  319  ZL4KX 4L7T LN21 (x2)

10m

UTC    dB Audio  Message
214000 -13 1393  ZL4KX PA5VL -15
214630 -19 2264  ZL4KX PA3BQC JO22 (x4)
214900 -23 1393  ZL4KX PA5VL -10 (x4)
211345 -21 2112  ZL4KX I5IAR JN53 (x2)
204145 -19 2381  ZL4KX G6CUT IO90
211315 -15  880  DO7BE ZL4KX RR73
212145 -17 1060  SP2TQQ ZL4KX RR73
212245 -17 1060  DL2TOS ZL4KX 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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