ON4APU — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: Belgium Most frequent locator attributed to this token: JO11

Receiver-side FT8 activity involving ON4APU, decoded by SO8OO in southeastern Poland. 365 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 30 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-11-04.

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 365 FT8 messages attributed to ON4APU as the transmitting token by decoded message structure across 30 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (39%), followed by 40 m (37%) and 80 m (12%). Most decodes (79%) fell within the six-hour window 15:00-21:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (70%); the estimated median was -4 dB.

Overview

365

Messages attributed

UTC dates decoded

Active 15-min windows

-4 dB

Estimated median S/N

Bands

80m · 44 60m · 32 40m · 136 20m · 142 10m · 11

First attributed message: 2026-06-06
Last attributed message: 2026-11-04 16:15 UTC

Observed FT8 message patterns

Attributed sample: 365 messages
Active dates: 30 UTC dates
Estimated median S/N: -4 dB
Estimated 10th-90th percentile: -14 to +9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 23, moderate (-15 to -9 dB) 87, strong (≥ -8 dB) 255.

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 ON4APU in decoded directed-looking exchanges:

G0JDK · England ×2 GE3TXA · England ×2 BA8BLK · China BD6IIC · China DS2MGT · Republic of Korea 8S2A · Sweden DA0M · Fed. Rep. of Germany EB3JT · Spain EJ8JCB · Ireland MI7RDK · Northern Ireland YO4NT · Romania DK4RH · Fed. Rep. of Germany

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 ON4APU

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: JO11 · 219 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,331 km (approx.)
Last such locator decoded: 2026-11-04 16:15 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	ON4APU S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-04 16:12	60m	-11 / -7	DK4RH	-9 / -	3	✓ Closing observed
11-04 16:12	60m	-12 / +2	IK4CBO	-7 / -2	6	✓ Full exchange observed
11-04 16:11	60m	-10 / -	F5OYA/P	- / -3	2	Partial capture
11-03 19:12	40m	+3 / -	RD0L/M	- / -5	3	Partial capture
11-03 19:11	40m	0 / -	VI40EUDXF	- / -	2	Partial capture
11-03 19:10	40m	-4 / -	PD40EUDXF	- / -	2	Partial capture
11-03 17:17	80m	-6 / -	LZ911TD	-6 / -13	2	Partial capture
11-03 17:15	40m	-12 / -4	EB3JT	-6 / -7	5	✓ Full exchange observed
11-03 17:08	40m	-14 / -	YP40CSM	- / -	2	Partial capture
11-01 17:12	60m	-4 / -	SQ4PKO	- / -9	2	✓ Closing fragment
11-01 17:10	60m	-6 / +6	OE6NIG	+2 / +2	7	✓ Full exchange observed
11-01 17:09	60m	-6 / -	G0JDK	-10 / +6	5	✓ Full exchange observed
11-01 17:08	60m	-4 / -9	DM3XD	-13 / -6	7	✓ Full exchange observed
11-01 17:08	60m	-12 / 0	DL8HOT	-22 / -8	5	✓ Full exchange observed
11-01 17:02	60m	-6 / -	6W/IK2HKT	- / 0	3	Partial capture
11-01 17:01	60m	-5 / -	T77RN	- / -	2	Partial capture
11-01 16:59	60m	-6 / -	GE3TXA	-17 / -	2	✓ Closing observed
11-01 16:54	40m	-4 / -	DA0M	- / -8	2	✓ Closing fragment
11-01 16:48	40m	+2 / -	PF40EUDXF	+4 / +4	13	Partial capture
11-01 16:43	40m	-3 / -	RU4CK/P	- / -	8	Partial capture
11-01 16:32	40m	- / +9	PF40EUDXF	-2 / -	2	Partial capture
11-01 16:24	40m	+1 / -	PA40EUDXF	- / -	3	Partial capture
10-12 18:43	40m	+4 / -	MI7RDK	- / -9	2	✓ Closing fragment
10-08 18:18	80m	+3 / -	DO5UH/P	- / -10	2	Partial capture
09-04 15:01	40m	-6 / -	<...>	- / -13	2	Partial capture
09-03 19:25	80m	-4 / -	R3ZBY	-10 / -	2	✓ Closing observed
09-03 19:20	80m	-11 / +1	R3YAU	-1 / -	3	✓ Closing observed
09-03 19:17	80m	0 / -	<...>	- / 0	3	Partial capture
09-03 19:14	80m	0 / -6	R6KX	0 / -11	6	✓ Full exchange observed
09-03 19:11	80m	- / +4	DK7TX	-7 / -	2	✓ Closing fragment
09-03 19:10	80m	0 / -17	<...>	-6 / -5	6	Partial capture
09-02 18:08	40m	+6 / -5	YO4NT	+6 / -1	4	✓ Full exchange observed
09-02 18:07	40m	+4 / -	SQ100PKP	- / -8	2	Partial capture
09-02 18:04	40m	-7 / 0	3Z100PKP	-8 / -2	3	Partial capture
09-02 18:03	40m	+4 / -	EJ8JCB	- / -7	2	✓ Closing fragment
09-02 18:00	40m	0 / -21	EG42SDC	-8 / -	6	Partial capture
09-02 17:59	40m	-8 / -	<...>	- / -	2	Partial capture
08-29 19:29	80m	- / -13	UR3HC	+7 / -	2	Partial capture
08-29 19:29	80m	- / -15	SP5FWT	+2 / -	3	Partial capture
08-29 19:19	80m	+4 / -4	SP9WAZ	+3 / -5	5	✓ Full exchange observed
08-29 19:18	80m	+2 / -3	DO2BBC	-2 / -5	4	✓ Full exchange observed
08-29 19:15	80m	-1 / -	SP1905MFK	- / -18	4	Partial capture
08-26 08:00	40m	-14 / -	ON6CQ	- / -	4	Partial capture
08-26 07:48	40m	-21 / -4	SN40KZE	-12 / -	3	Partial capture
08-25 14:44	20m	+8 / -	<...>	- / -10	4	Partial capture
08-21 20:24	80m	-10 / -12	SV8TCK	+11 / -8	6	Partial capture
08-21 20:22	80m	-6 / +1	<...>	-11 / -2	5	Partial capture
08-21 20:12	20m	+2 / -	BA8BLK	- / -10	2	✓ Closing fragment
08-21 20:10	20m	+5 / -	DS2MGT	- / -15	2	✓ Closing fragment
08-21 20:08	20m	+12 / -	UA0LQE	- / -16	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
171245  -4  804  SQ4PKO ON4APU RR73
173615  -5  881  OI6C ON4APU 73
161100 -10  837  F5OYA/P ON4APU JO11
161115  -5 1315  ON4APU LZ911TD -11
161130  -9  837  F5OYA/P ON4APU R-03
161245  -9 1918  ON4APU IK4CBO JN54
161245  -8 1027  ON4APU DK4RH -07
161315  -5 1918  ON4APU IK4CBO JN54
161315 -10 1027  ON4APU DK4RH RR73
161330 -11  837  DK4RH ON4APU 73
161345  -7 1918  ON4APU IK4CBO JN54
161400 -12  837  IK4CBO ON4APU -02
161415  -8 1918  ON4APU IK4CBO R+02 (x2)
161545 -11  837  DH3KR ON4APU JO11

40m

UTC    dB Audio  Message
171415 -11 2462  YP40CSM ON4APU R-13
171430  +4  441  ON4APU RR73; OK1UVJ <...> -22
171500  -6 2462  ON4APU EB3JT JN01
171515 -11 2463  EB3JT ON4APU -07
171530  -4 2462  ON4APU EB3JT R-04
171545 -12 2463  EB3JT ON4APU RR73
171600  -7 2462  ON4APU EB3JT 73
191000  -4  375  PD40EUDXF ON4APU JO11 (x2)
191100  -4  376  <VI40EUDXF> ON4APU JO11 (x2)
191245  +4 2778  RD0L/M ON4APU JO11 (x3)
191530  +2 2900  ON4APU RR73; 9A2EU <...> +18

80m

UTC    dB Audio  Message
191715  +0  800  <...> ON4APU JO11 (x2)
191800 +15 2625  ON4APU SP100PKP +10
191815  -1  799  <...> ON4APU R+00
191830 +17 2625  ON4APU RR73; UR5TMT <...> -06
192000 -11  799  R3YAU ON4APU JO11
192015  +2 1733  ON4APU R3YAU +01 (x2)
192115 -12  226  ON4APU R3ZBY -10 (x2)
192530  -4  800  R3ZBY ON4APU 73
181830  +0 2557  DO5UH/P ON4APU JO11 (x2)
171745  -6 1284  ON4APU LZ911TD +13
171800  -6 2430  LZ911TD ON4APU R-13

20m

UTC    dB Audio  Message
200915 +11 2656  ON4APU DL1R JN58
200930 +10  779  CQ ON4APU JO11
200945 +10 2656  ON4APU DL1R JN58
201000  +3  779  CQ ON4APU JO11
201015 +11 2656  ON4APU DL1R JN58
201015  +0  834  ON4APU DB9LG JO40
201030  +2  779  DS2MGT ON4APU R-15
201045 +12 2656  ON4APU DL1R JN58
201100  +8  779  DS2MGT ON4APU 73
201200  +4  779  BA8BLK ON4APU R-10 (x2)
144415 +14 2463  <...> ON4APU JO11 (x4)

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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