UB3DUW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KO85

Receiver-side FT8 activity involving UB3DUW, decoded by SO8OO in southeastern Poland. 40 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-28.

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 40 FT8 messages attributed to UB3DUW as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (68%), followed by 10 m (33%). Several six-hour UTC windows tied for the largest share (70%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

20m · 27 10m · 13

First attributed message: 2026-06-06
Last attributed message: 2026-08-28 18:55 UTC

Observed FT8 message patterns

Attributed sample: 40 messages
Active dates: 9 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -22 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 12, strong (≥ -8 dB) 11.

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 UB3DUW in decoded directed-looking exchanges:

SV2AEL · Greece BH3CFN · China DH1FA · Fed. Rep. of Germany DL7GW · Fed. Rep. of Germany IQ4JO · Italy R3KCW · European Russia R6DVV · European Russia RA0SCZ · Asiatic Russia RD0L · Asiatic Russia RJ3DC · European Russia UB8CSJ · Asiatic Russia

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 UB3DUW

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: KO85 · 23 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,193 km (approx.)
Last such locator decoded: 2026-08-28 18:55 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	UB3DUW S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 18:29	20m	- / -	F4ACR	+3 / -	5	Partial capture
08-28 18:21	20m	- / -	BG8HNC	-20 / -	2	Partial capture
08-28 18:21	20m	-18 / -	YC9GBQ	-3 / -22	13	Partial capture
08-28 18:19	20m	- / -	PD3LKN	+9 / -	11	Partial capture
08-28 18:13	20m	-8 / -	RD0L	-12 / -24	10	✓ Closing observed
08-13 10:15	10m	- / -16	SV2AEL	-10 / -	2	✓ Closing fragment
08-12 09:43	10m	- / -	R7DX	-15 / -	3	Partial capture
08-12 02:38	20m	- / -7	IQ4JO	-9 / -	3	✓ Closing fragment
08-12 02:35	20m	- / -4	R6DVV	-20 / -	2	✓ Closing fragment
08-12 02:33	20m	- / -10	R3KCW	-11 / -	3	✓ Closing fragment
08-11 19:14	20m	- / -3	DL9KM	-14 / -	3	Partial capture
07-24 18:35	20m	-15 / -10	EA8RCC	-6 / -	6	Partial capture
07-20 18:47	20m	- / -15	ER3RR	-22 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
182345  +3 1184  UB3DUW PD3LKN JO22
182415  -5 2383  UB3DUW YC9GBQ OI81
182415 +10 1184  UB3DUW PD3LKN JO22
182445  -4 2382  UB3DUW YC9GBQ OI81
182445  +9 1184  UB3DUW PD3LKN JO22
182515  -2 2382  UB3DUW YC9GBQ OI81 (x2)
182630 -12 1335  CQ UB3DUW KO85
182645 -11 1027  UB3DUW G6MTI IO81
182915 -10 1335  UB3DUW F4ACR IN96 (x5)
185545 -17 1540  <...> UB3DUW KO85

10m

UTC    dB Audio  Message
103930 -17 1952  UB3DUW PD2MN -12
094330 -15 1968  UB3DUW R7DX KN84 (x3)
101545  -9 2148  UB3DUW SV2AEL R-16 (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.

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