5Z4VJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Kenya Most frequent locator attributed to this token: KI88

Receiver-side FT8 activity involving 5Z4VJ, decoded by SO8OO in southeastern Poland. 13,848 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 68 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-14.

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 13,848 FT8 messages attributed to 5Z4VJ as the transmitting token by decoded message structure across 68 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (75%), followed by 10 m (13%) and 40 m (10%). Most decodes (52%) fell within the six-hour window 22:00-04:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8.9 dB.

Overview

13,848

Messages attributed

UTC dates decoded

997

Active 15-min windows

-8.9 dB

Estimated median S/N

Bands

160m · 3 80m · 296 40m · 1,386 20m · 10,402 10m · 1,761

First attributed message: 2026-06-07
Last attributed message: 2026-09-14 15:06 UTC

Observed FT8 message patterns

Attributed sample: 13,848 messages
Active dates: 68 UTC dates
Estimated median S/N: -8.9 dB
Estimated 10th-90th percentile: -17 to +5.4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2,188, moderate (-15 to -9 dB) 4,839, strong (≥ -8 dB) 6,821.

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 5Z4VJ in decoded directed-looking exchanges:

IK4LZH · Italy ×3 LZ1KU · Bulgaria ×3 W5GRP · United States ×3 WW9WTF · United States ×3 EA1DSK · Spain ×3 CT3IQ · Madeira Islands ×2 R3OR · European Russia ×2 RD9U · Asiatic Russia ×2 SP0ZKR · Poland ×2 UA3ZAB · European Russia ×2 4X1PF · Israel ×2 BH4GWF · China ×2

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 5Z4VJ

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: KI88 · 8,052 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 5,901 km (approx.)
Last such locator decoded: 2026-09-14 15:06 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	5Z4VJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-18 00:23	40m	- / -	KY2J	-14 / -	8	Partial capture
09-17 21:56	160m	- / -	SP2LLP	-12 / -	3	Partial capture
09-16 15:52	40m	- / -	G7SLB	-16 / -	2	Partial capture
09-15 20:43	60m	- / -	IW7EGY	+1 / -	2	Partial capture
09-14 14:52	10m	-16 / -	HA3KZ	- / -3	2	✓ Closing fragment
09-14 14:05	10m	-15 / -	F1QV	- / +2	2	✓ Closing fragment
09-14 13:35	10m	-13 / -	M8RAG	- / -7	2	✓ Closing fragment
09-14 13:30	10m	-16 / -	DN9MIC	- / -14	3	✓ Closing fragment
09-14 13:29	10m	-15 / -	DL7SHK	- / +4	2	✓ Closing fragment
09-14 13:27	10m	-12 / -	PY2ECC	- / -6	3	✓ Closing fragment
09-14 13:26	10m	-14 / -	R2FEA	- / +4	2	✓ Closing fragment
09-14 13:25	10m	-11 / -	IU2IKT	- / -	2	✓ Closing fragment
09-14 13:24	10m	-15 / -	IU7IPX	- / +10	2	✓ Closing fragment
09-14 13:20	10m	-16 / -	G3VZG	- / +1	2	✓ Closing fragment
09-14 13:18	10m	-14 / -	SP7HKK	- / -	2	✓ Closing fragment
09-14 13:16	10m	-8 / -	DM3JK	- / -16	3	✓ Closing fragment
09-14 13:15	10m	-8 / -	PD1RON	- / -4	2	✓ Closing fragment
09-14 13:14	10m	-10 / -	HB9NBN	- / -1	2	✓ Closing fragment
09-14 13:13	10m	-10 / -	R4WR	- / +4	2	✓ Closing fragment
09-14 13:11	10m	-10 / -	SM5DXR	- / -10	2	✓ Closing fragment
09-14 13:10	10m	-12 / -	F1FDW	- / -11	2	✓ Closing fragment
09-14 13:08	10m	-16 / -	F4JUO	- / +4	2	Partial capture
09-14 13:06	10m	-14 / -	PD0NAH	- / 0	2	✓ Closing fragment
09-14 13:04	10m	-15 / -	G5JCC	- / +1	4	✓ Closing fragment
09-14 13:00	10m	-14 / -	IK2HKN	- / -7	2	✓ Closing fragment
09-14 12:59	10m	-14 / -	SP9Y	- / +1	2	✓ Closing fragment
09-14 12:57	10m	-14 / -	DN9GLA	- / +6	2	✓ Closing fragment
09-14 12:56	10m	-12 / -	PD2JAN	- / -1	2	✓ Closing fragment
09-14 12:54	10m	-15 / -	HA5UA	- / -	2	✓ Closing fragment
09-12 22:11	40m	- / -10	OH1LEG	+8 / -	3	Partial capture
09-12 22:07	40m	- / -	EA5XA	-12 / -	2	Partial capture
09-12 21:58	40m	- / -	OH1ZE	-10 / -	3	Partial capture
09-12 21:54	40m	- / -6	IU1OPQ	-6 / -	2	✓ Closing fragment
09-12 21:44	40m	- / -11	G0SKW	-10 / -	2	✓ Closing fragment
09-12 21:44	40m	- / -	SA6KLO	-4 / -	9	Partial capture
09-12 21:30	40m	- / -18	DF1OLS	+4 / -	5	✓ Closing fragment
09-12 21:24	40m	- / -10	RC2GB	-2 / -	2	✓ Closing fragment
09-12 21:23	40m	- / -	M7NTL	-10 / -	5	Partial capture
09-12 21:21	40m	- / -12	IU3QYU	-3 / -	13	✓ Closing fragment
09-12 21:21	40m	- / -11	LA7DMA	-13 / -	2	✓ Closing fragment
09-12 21:17	40m	- / -8	DL1KMD	-6 / -	2	✓ Closing fragment
09-12 20:41	40m	- / -12	OH5KT	-11 / -	2	✓ Closing fragment
09-12 20:32	40m	- / -	UT2UB	-7 / -	2	✓ Closing fragment
09-12 20:29	40m	- / -15	R7LV	+4 / -	8	✓ Closing fragment
09-12 20:25	40m	- / -10	IU2WCY	+3 / -	2	✓ Closing fragment
09-12 20:25	40m	- / -17	IZ2JPN	-20 / -	4	✓ Closing fragment
09-12 20:24	40m	- / -19	MM0DXL	-22 / -	4	✓ Closing fragment
09-12 20:23	40m	- / -12	UT6HN	+10 / -	3	Partial capture
09-12 20:19	40m	- / -18	RD9M/3	-9 / -	4	✓ Closing fragment
09-12 20:17	40m	- / -	F4IFO	-7 / -	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
221130  +8 1177  5Z4VJ OH1LEG -10 (x3)
155200 -14  243  5Z4VJ G7SLB IO92 (x2)
002300 -17 2289  5Z4VJ KY2J FN31 (x8)
050630  -5 2291  5Z4VJ UZ5CA -11
180115 +17 2826  5Z4VJ ON6WDL -19

160m

UTC    dB Audio  Message
203800  +8 1946  5Z4VJ RU3SD KO94
203800 +16 2839  5Z4VJ RU3GF KO92
203815  -3 2030  5Z4VJ IZ3ENH JN56
203830 +16 2839  5Z4VJ RU3GF KO92
203845  +5 2030  5Z4VJ IZ3ENH JN56
203900 +17 2839  5Z4VJ RU3GF KO92
203900  -3 2593  5Z4VJ OH6NEQ KP21
203915  -3 2030  5Z4VJ IZ3ENH JN56
203930 +17 2839  5Z4VJ RU3GF KO92
203930  -2 2593  5Z4VJ OH6NEQ KP21
203200  -5 2346  5Z4VJ DJ7YP JO41 (x2)
215645 -22 2081  5Z4VJ SP2LLP JO94 (x3)

60m

UTC    dB Audio  Message
020800  +1  349  5Z4VJ 4L7T LN21 (x4)
211830  -7  377  5Z4VJ GM0DEQ IO75 (x2)
204345  -1 1065  5Z4VJ IW7EGY JN80 (x2)

10m

UTC    dB Audio  Message
144000 -14 2387  CQ 5Z4VJ KI88 (x3)
144130 -18 2388  KN6RO 5Z4VJ -04
144300 -16 2387  EU6AX 5Z4VJ -09
145130 -17 2388  IU8JLX 5Z4VJ 73
145200 -15 2388  HA3KZ 5Z4VJ -03 (x2)
145300 -16 2388  MI0AYR 5Z4VJ -20
145530 -18 2388  CQ 5Z4VJ KI88                         a1 (x4)
123330 -16 2441  5Z4VJ OV3T 73
160830 -19 2060  5Z4VJ EB8ARQ IL18

80m

UTC    dB Audio  Message
233130 -24 1905  5Z4VJ N6AR EL98 (x2)
235800 -11 1869  5Z4VJ RW1AI KO59
235815 -12 2653  CX6TU 5Z4VJ KI88
235830 -10 1869  5Z4VJ RW1AI KO59 (x2)
235945 -21 2653  CX6TU 5Z4VJ R-21
000000 -10 1869  5Z4VJ RW1AI KO59 (x3)
000100  -3 2654  5Z4VJ OH7FNB KP41
000130 -13 1869  5Z4VJ RW1AI KO59
000130 -17 2654  5Z4VJ OH7FNB KP41 (x3)

20m

UTC    dB Audio  Message
202815  -2 2369  M3BWF 5Z4VJ KI88
202830  -7 2156  5Z4VJ M3BWF -10
202845  -2 2369  M3BWF 5Z4VJ R-16
202900  +0 2157  5Z4VJ M3BWF RR73
202915  +2 2370  M3BWF 5Z4VJ R-16
202930  +3 2157  5Z4VJ M3BWF RR73
202945  +2 2370  M3BWF 5Z4VJ R-16
203000  +2 2157  5Z4VJ M3BWF RR73
203030  +3 2369  VE3MJM 5Z4VJ KI88 (x5)
203300  +2 2370  JH1GZE 5Z4VJ KI88 (x2)

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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