R4UBL — 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: European Russia Most frequent locator attributed to this token: LO14

Receiver-side FT8 activity involving R4UBL, decoded by SO8OO in southeastern Poland. 28 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-10-09.

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 28 FT8 messages attributed to R4UBL as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (75%), followed by 20 m (14%) and 10 m (11%). Several six-hour UTC windows tied for the largest share (75%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

40m · 21 20m · 4 10m · 3

First attributed message: 2026-06-07
Last attributed message: 2026-10-09 18:50 UTC

Observed FT8 message patterns

Attributed sample: 28 messages
Active dates: 4 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -17 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 10, moderate (-15 to -9 dB) 8, strong (≥ -8 dB) 10.

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 R4UBL in decoded directed-looking exchanges:

4Z5AV · Israel CR7BRV · Portugal EA7R · Spain EX7CQ · Kyrgyzstan IK6GPZ · Italy OE2CAL · Austria PD9HIX · Netherlands SP4BB · Poland

Most frequent locator attributed to R4UBL

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: LO14 · 9 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,524 km (approx.)
Last such locator decoded: 2026-10-09 18:50 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	R4UBL S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-18 10:48	10m	- / +4	EA7R	+10 / -	2	✓ Closing fragment
10-17 12:12	10m	- / -16	CR7BRV	+6 / -	2	✓ Closing fragment
10-13 15:53	40m	- / -9	RA3M	-9 / -	5	Partial capture
10-10 13:22	10m	- / +5	4Z5AV	+1 / -	2	✓ Closing fragment
10-09 18:49	40m	-7 / -	JE2URF	- / -	2	Partial capture
10-09 18:44	40m	- / -1	SP4BB	-2 / -	3	✓ Closing fragment
10-09 18:39	40m	-8 / -16	PD9HIX	+2 / -14	7	✓ Full exchange observed
10-09 18:34	40m	-16 / -13	TA3ZZ	-11 / -13	5	Partial capture
10-09 18:30	40m	-16 / -14	IK6GPZ	+4 / -	8	✓ Closing observed
10-09 18:28	40m	-14 / -13	OE2CAL	+20 / -1	4	✓ Full exchange observed
10-09 18:22	40m	-14 / +3	EX7CQ	-6 / +7	4	✓ Full exchange observed
10-06 17:38	40m	- / -	PE1NPS	-6 / -	3	Partial capture
10-06 17:31	40m	- / -11	IW8BZE	-22 / -	2	Partial capture
10-06 17:19	40m	- / -	R3LDK	+1 / -	4	Partial capture
10-06 17:13	40m	-15 / -	UA3UBV	- / -11	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

10m

UTC    dB Audio  Message
132230  -3 1688  R4UBL 4Z5AV +05 (x2)
121200  +7  851  R4UBL CR7BRV -16 (x2)
104800  +9  637  R4UBL EA7R +04 (x2)

40m

UTC    dB Audio  Message
184000  +5  992  R4UBL PD9HIX -16
184015 -11  990  PD9HIX R4UBL R-11
184030  +1  992  R4UBL PD9HIX RR73
184045  -7  990  PD9HIX R4UBL 73
184400  +3 1168  R4UBL SP4BB -01 (x3)
184715  -6 1385  OM7AMA R4UBL LO14
184900  -5 1248  JE2URF R4UBL LO14 (x2)
155345 -10 2178  R4UBL RA3M -09 (x5)

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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