ON4KTJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Belgium Most frequent locator attributed to this token: JO10

Receiver-side FT8 activity involving ON4KTJ, decoded by SO8OO in southeastern Poland. 28 FT8 messages attributed to this token as transmitter, on 160m, 60m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-11 and 2026-09-12.

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 28 FT8 messages attributed to ON4KTJ as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (64%), followed by 60 m (36%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

160m · 18 60m · 10

First attributed message: 2026-09-11
Last attributed message: 2026-09-12 19:48 UTC

Observed FT8 message patterns

Attributed sample: 28 messages
Active dates: 2 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -19 to -12 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 11, moderate (-15 to -9 dB) 16, strong (≥ -8 dB) 1.

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 ON4KTJ in decoded directed-looking exchanges:

I8OHQ · Italy DK3ASE · Fed. Rep. of Germany DL5CG · Fed. Rep. of Germany IK1BQD · Italy OK1DXR · Czech Republic ON7GB · Belgium F1PSX · France F4AWT · France LZ1ZF · Bulgaria PD3LKN · Netherlands DL3JHK · Fed. Rep. of Germany F1IQH · France

Most frequent locator attributed to ON4KTJ

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: JO10 · 22 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,335 km (approx.)
Last such locator decoded: 2026-09-12 19:48 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	ON4KTJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-12 20:07	60m	- / -13	GX4RAF/P	-4 / -	2	✓ Closing fragment
09-12 20:04	60m	- / -10	LY8O	+5 / -	2	✓ Closing fragment
09-12 19:55	60m	- / -	YO6LM	-2 / -	2	Partial capture
09-12 19:53	60m	- / -10	OM5JG	-1 / -	3	✓ Closing fragment
09-12 19:41	160m	-18 / -11	SO100PKP	+17 / -	2	Partial capture
09-12 19:34	160m	- / -17	DK3ASE	+4 / -	2	✓ Closing fragment
09-12 19:32	160m	-11 / -	DG2RBH	- / -	3	Partial capture
09-12 19:29	160m	- / -	SP5GW	+1 / -	5	Partial capture
09-11 22:20	80m	- / -8	9A5E	+8 / -	2	✓ Closing fragment
09-11 21:59	160m	-13 / -18	IK1BQD	-3 / -	10	✓ Closing observed
09-11 21:58	160m	- / -	G3UHU	-13 / -	3	Partial capture
09-11 21:54	160m	- / -	G3UHU	-14 / -	2	Partial capture
09-11 21:49	160m	- / -17	ON7GB	-4 / -	9	✓ Closing fragment
09-11 21:47	160m	- / -	OK9DMR	-19 / -	3	Partial capture
09-11 21:47	160m	- / -18	2E0FVN	-17 / -	2	Partial capture
09-11 21:43	160m	-17 / -14	DL5CG	-4 / -	7	✓ Full exchange observed
09-11 21:42	160m	- / -1	F1PBZ	-14 / -	2	Partial capture
09-11 21:42	160m	-19 / -12	OK1DXR	+5 / -	5	✓ Closing observed
09-11 21:32	60m	- / -4	G3UHU	0 / -	4	✓ Closing fragment
09-11 21:31	60m	- / -	9A4ZM	0 / -	2	Partial capture
09-11 21:27	60m	-16 / -	YO9IE	- / -	2	Partial capture
09-11 21:20	60m	- / -2	G0ORC	-12 / -	2	✓ Closing fragment
09-11 21:19	60m	- / -	IW5DNZ	-12 / -	4	Partial capture
09-11 21:11	60m	- / -5	G0JEI	-3 / -	3	✓ Closing fragment
09-11 21:11	60m	- / -	GE7RTI	-9 / -	3	Partial capture
09-11 21:11	60m	- / -	OZ1LGJ	-9 / -	2	Partial capture
09-11 21:09	60m	-15 / -15	OZ7FOC	-9 / -	4	✓ Full exchange observed
09-11 21:05	60m	- / -8	F1IQH	+2 / -	4	✓ Closing fragment
09-11 21:05	60m	- / -10	G0JEI	-2 / -	5	Partial capture
09-11 21:05	60m	- / -	PI4TX	-6 / -	2	Partial capture
08-14 17:08	20m	- / -16	LZ1ZF	-9 / -	2	✓ Closing fragment
08-13 15:38	10m	- / -6	I8OHQ	-11 / -	3	✓ Closing fragment
08-02 08:30	20m	- / -2	F4AWT	-9 / -	3	✓ Closing fragment
08-02 08:27	20m	- / -9	PD3LKN	+2 / -	3	✓ Closing fragment
08-02 08:17	20m	- / +2	F1PSX	-10 / -	3	✓ Closing fragment
08-02 08:13	20m	- / -16	RU3QR	-7 / -	3	Partial capture
07-27 21:16	40m	- / -	SM7JKW	-7 / -	2	Partial capture
07-27 21:09	40m	- / -	DH1KU	-20 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
213230  -7  934  ON4KTJ OZ1LGJ JO46
213230  +0  747  ON4KTJ G3UHU IO80 (x3)
213545 -19  934  CQ ON4KTJ JO10
213715 -17  878  YO9IE ON4KTJ JO10
195345  -1 1200  ON4KTJ OM5JG -10 (x3)
195515  -3 1944  ON4KTJ YO6LM KN25 (x2)
200400  +4 1243  ON4KTJ LY8O -10 (x2)
200700  -3  628  ON4KTJ GX4RAF/P -13 (x2)

160m

UTC    dB Audio  Message
192945  +1 1746  ON4KTJ SP5GW KO12 (x4)
193215 -12  330  DG2RBH ON4KTJ JO10 (x3)
193430  +3  662  ON4KTJ DK3ASE -17 (x2)
193700  -1  329  ON4KTJ DG2RBH JN68
194100 +17 1036  ON4KTJ SO100PKP -11
194130 +15 1036  ON4KTJ RR73; SP4XDC <...> +14
194145 -18 1036  SO100PKP ON4KTJ R+14
194515 -10  795  ON4KTJ DC5CH -14
194830 -15  897  CQ ON4KTJ JO10

80m

UTC    dB Audio  Message
222030  +8 2134  ON4KTJ 9A5E -08 (x2)

20m

UTC    dB Audio  Message
080600 -11  265  ON4KTJ UT7UJ -13
081300  -5 1133  ON4KTJ RU3QR -16 (x3)
081700  -7  271  ON4KTJ F1PSX JN08 (x3)
082700  +2  252  ON4KTJ PD3LKN JO22 (x3)
083030 -10  277  ON4KTJ F4AWT JN24 (x3)
170845  -8 1220  ON4KTJ LZ1ZF -16 (x2)

10m

UTC    dB Audio  Message
153830 -15 1294  ON4KTJ I8OHQ -06 (x3)

40m

UTC    dB Audio  Message
210900 -11 1040  ON4KTJ DH5BM JO41
210900 -20 2026  ON4KTJ DH1KU JO30 (x2)
211530  -8 2535  ON4KTJ F1PBZ -09
211630  -8 1040  ON4KTJ SM7JKW JO65 (x2)
211730 -18 1041  ON4KTJ F1IQH JN27
212030  -9 1039  ON4KTJ DL3JHK JO62 (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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