ON4BMA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Belgium Most frequent locator attributed to this token: JO21

Receiver-side FT8 activity involving ON4BMA, decoded by SO8OO in southeastern Poland. 60 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-09.

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 60 FT8 messages attributed to ON4BMA as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (53%), followed by 20 m (23%) and 10 m (23%). Most decodes (63%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

40m · 32 20m · 14 10m · 14

First attributed message: 2026-06-08
Last attributed message: 2026-09-09 18:46 UTC

Observed FT8 message patterns

Attributed sample: 60 messages
Active dates: 8 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -16 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 6, moderate (-15 to -9 dB) 35, strong (≥ -8 dB) 19.

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 ON4BMA in decoded directed-looking exchanges:

LZ4VR · Bulgaria ON1CH · Belgium DH0GBC · Fed. Rep. of Germany OZ3TT · Denmark PV8AJ · Brazil

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 ON4BMA

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: JO21 · 45 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,192 km (approx.)
Last such locator decoded: 2026-09-09 18:46 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	ON4BMA S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-08 18:12	40m	-7 / -	HB9TLL	- / -	3	Partial capture
09-08 06:42	40m	- / -	DL3MIB	+8 / -	7	Partial capture
09-08 06:41	40m	- / -14	OZ3TT	+8 / -	2	✓ Closing fragment
09-07 16:14	40m	- / -	IK2ZJR	+1 / -	3	Partial capture
09-07 16:08	40m	-14 / -	DK3WL	- / -	14	Partial capture
08-11 07:32	40m	- / -	SP3IPA	-12 / -	4	Partial capture
08-11 07:26	20m	- / -	ON1CH	-16 / -	2	Partial capture
08-11 06:57	10m	-12 / -	ON1CH	-16 / -	7	✓ Full exchange observed
08-11 06:57	10m	-14 / -	LZ4VR	- / -10	2	✓ Closing fragment
08-02 19:26	40m	-11 / +5	DH0GBC	+4 / +4	3	✓ Full exchange observed
08-02 19:25	40m	- / -15	F1PBZ	-8 / -	2	Partial capture
07-21 03:28	40m	-13 / -	VP5G	- / -	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
064115  +6  468  ON4BMA OZ3TT -14 (x2)
064215  +8 1070  ON4BMA DL3MIB JN57 (x7)
181215  -9  877  HB9TLL ON4BMA JO21 (x3)
184630  -8  877  OZ/DL3KWF ON4BMA JO21
184715  -8  487  ON4BMA DK5CR/QRP -01
184745  -7  470  ON4BMA OZ/OO4O -01

20m

UTC    dB Audio  Message
072600 -13 1049  ON4BMA ON1CH JO21 (x2)

10m

UTC    dB Audio  Message
065600  -9  794  CQ ON4BMA JO21
065700 -13  794  LZ4VR ON4BMA -10
065715 -24 1538  ON4BMA ON1CH JO21
065730 -15  794  LZ4VR ON4BMA RR73
065745 -18 1538  ON4BMA ON1CH JO21 (x2)
065830  -9  794  ON1CH ON4BMA +24
065845 -11 1538  ON4BMA ON1CH R+12
065900 -14  794  ON1CH ON4BMA RR73
065915 -13 1538  ON4BMA ON1CH 73

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee