ON4DCU — 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: JO20

Receiver-side FT8 activity involving ON4DCU, decoded by SO8OO in southeastern Poland. 68 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-29 and 2026-10-02.

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 68 FT8 messages attributed to ON4DCU as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (85%), followed by 80 m (15%). In this small sample, the estimated median decoder S/N was -10 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-10 dB

Estimated median S/N

Bands

80m · 10 40m · 58

First attributed message: 2026-09-29
Last attributed message: 2026-10-02 20:23 UTC

Observed FT8 message patterns

Attributed sample: 68 messages
Active dates: 2 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -18 to -4 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 12, moderate (-15 to -9 dB) 28, strong (≥ -8 dB) 28.

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 ON4DCU in decoded directed-looking exchanges:

BI4IWL · China EA3AVS · Spain EB3JT · Spain F5PBG · France LY5J · Lithuania RN2F · Kaliningrad RX3ASQ · European Russia SP5MIG · Poland UX7QV · Ukraine DO1FZL · Fed. Rep. of Germany DO2DH · 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 ON4DCU

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: JO20 · 38 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,194 km (approx.)
Last such locator decoded: 2026-10-02 20:20 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	ON4DCU S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-02 20:24	40m	- / -	RZ4FWA	-18 / -	3	Partial capture
10-02 20:21	40m	-12 / -	UX7QV	- / -8	5	✓ Closing fragment
10-02 20:16	40m	-12 / -	RN2F	- / +5	2	✓ Closing fragment
10-02 20:11	40m	-16 / -	LY5J	- / +6	2	✓ Closing fragment
10-02 20:02	40m	-8 / -	TJ1GD	- / -25	12	Partial capture
10-02 19:54	40m	-8 / -	BI4IWL	- / -24	6	✓ Closing fragment
10-02 19:36	40m	-5 / -	RX3ASQ	- / -9	3	✓ Closing fragment
10-02 19:35	40m	-2 / -	SP5MIG	- / -2	2	✓ Closing fragment
10-02 19:33	40m	-4 / -2	F5PBG	-6 / -	5	✓ Full exchange observed
10-02 19:25	40m	-12 / -	J48S	- / -	2	Partial capture
10-02 19:22	40m	-12 / -	BI4IWL	- / -	3	Partial capture
10-02 17:15	80m	- / -	UA4FKT	-1 / -	4	Partial capture
10-02 17:14	80m	-24 / +6	DO1FZL	-3 / +9	4	✓ Full exchange observed
10-02 17:08	80m	- / -	9A4ZM	0 / -	2	Partial capture
10-02 17:08	80m	- / -	OH3EX	+2 / -	2	Partial capture
10-02 17:05	80m	-16 / -	DO2DH	-24 / -5	3	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
201615 -19 2216  RN2F ON4DCU +05 (x2)
201815 -11 2216  CQ ON4DCU JO20 (x2)
201945 -10 2216  EB3JT ON4DCU RR73
202015  -9 2216  CQ ON4DCU JO20 (x2)
202115 -10 2216  UX7QV ON4DCU -08 (x5)
202430 -22 2027  ON4DCU RZ4FWA LO23 (x3)

80m

UTC    dB Audio  Message
170815  +2 1826  ON4DCU 9A4ZM JN86
170845  +2 2763  ON4DCU OH3EX KP20
170845  +0 1247  ON4DCU EU1AFX KO43
170845  -2 1825  ON4DCU 9A4ZM JN86
171415  -1 1830  ON4DCU DO1FZL JO50
171430 -24 1830  DO1FZL ON4DCU +09
171445  -5 1830  ON4DCU DO1FZL R+06
171500 -23 1830  DO1FZL ON4DCU RR73
171515  -1 1830  ON4DCU UA4FKT LO23
171530 -24 1830  CQ ON4DCU JO20
171545  +3 1830  ON4DCU UA4FKT LO23 (x3)
191900 -17 1830  YO4GIY ON4DCU JO20
192030 -18 1829  S55X ON4DCU JO20

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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