R4FBJ — 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: KO84

Receiver-side FT8 activity involving R4FBJ, decoded by SO8OO in southeastern Poland. 384 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 12 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-11-05.

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 384 FT8 messages attributed to R4FBJ as the transmitting token by decoded message structure across 12 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (96%), followed by 80 m (4%). Most decodes (70%) fell within the six-hour window 07:00-13:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

384

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 16 20m · 368

First attributed message: 2026-06-09
Last attributed message: 2026-11-05 05:23 UTC

Observed FT8 message patterns

Attributed sample: 384 messages
Active dates: 12 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -20 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 114, moderate (-15 to -9 dB) 172, strong (≥ -8 dB) 98.

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 R4FBJ in decoded directed-looking exchanges:

DK6JT · Fed. Rep. of Germany DL3RN · Fed. Rep. of Germany DL4ME · Fed. Rep. of Germany IU4QQE · Italy ON4ASV · Belgium R3DFE/M · European Russia R6YG · European Russia R9TS · Asiatic Russia SP6EFY · Poland TA2ED · Asiatic Turkey R1AV · European Russia R5DT · European 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 R4FBJ

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: KO84 · 275 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,150 km (approx.)
Last such locator decoded: 2026-11-05 05:23 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	R4FBJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-06 05:20	80m	- / -6	R5DT	-22 / -	2	✓ Closing fragment
11-05 05:20	80m	- / -	EU2ABM	-4 / -	2	Partial capture
11-05 05:13	80m	- / -	EU2ABM	+9 / -	3	Partial capture
11-05 05:10	80m	- / -	RA3DAD	-6 / -	2	Partial capture
11-05 05:04	80m	- / -	SP8HDC	-13 / -	3	Partial capture
11-05 04:59	80m	- / -14	RW1AI	-12 / -	2	✓ Closing fragment
11-05 04:58	80m	- / -	S50XX	+8 / -	4	Partial capture
11-03 07:53	20m	- / -	IK5PWQ	-17 / -	4	Partial capture
08-23 08:20	20m	- / -	IV3APC	0 / -	2	Partial capture
08-21 19:38	20m	- / -11	SP6EFY	+3 / -	7	✓ Closing fragment
08-21 19:26	20m	- / -	IK0XFD	+7 / -	3	Partial capture
08-21 19:25	20m	- / -	DF6QN	+16 / -	5	Partial capture
08-21 19:21	20m	- / -	DF6QN	+20 / -	2	Partial capture
08-21 19:11	20m	- / -	IV3IUM	+10 / -	4	Partial capture
08-21 19:07	20m	- / -10	PD2WL	-2 / -	7	Partial capture
08-21 19:06	20m	- / -	IV3IUM	+6 / -	5	Partial capture
08-21 18:53	20m	- / +3	OE9RRI	-18 / -	4	Partial capture
08-21 18:47	20m	- / -15	PD2WL	-4 / -	8	Partial capture
08-21 18:41	20m	- / -	PD4RJ	-6 / -	4	Partial capture
08-21 18:37	20m	- / -	PC9K	-14 / -	2	Partial capture
08-21 18:35	20m	- / -	PA3GAE	-8 / -	4	Partial capture
08-21 18:33	20m	- / -	PD4RJ	-10 / -	4	Partial capture
08-21 18:27	20m	- / -	PD4RJ	-8 / -	4	Partial capture
08-21 18:24	20m	- / -	PD4RJ	-12 / -	2	Partial capture
08-21 17:49	20m	- / -	PD4RJ	-11 / -	4	Partial capture
08-21 17:48	20m	- / -	IV3KON	0 / -	2	Partial capture
08-21 17:37	20m	- / -	PD4RJ	-18 / -	3	Partial capture
08-21 17:37	20m	- / -	R6DZR	-10 / -	2	Partial capture
08-21 17:33	20m	- / -	SV2AEL	-1 / -	2	Partial capture
08-21 17:27	20m	- / -9	ON4ASV	+9 / -	3	✓ Closing fragment
08-21 16:47	20m	- / -	PD4RJ	-15 / -	3	Partial capture
08-21 16:39	20m	- / -	SV1EKI	-12 / -	2	Partial capture
08-21 16:23	20m	- / -20	TA2ED	-6 / -	2	✓ Closing fragment
08-21 16:17	20m	- / -	OO0O	-20 / -	2	Partial capture
08-21 16:17	20m	- / -	PD4RJ	-14 / -	3	Partial capture
08-21 16:12	20m	- / -	PD4RJ	-12 / -	4	Partial capture
08-21 16:08	20m	- / -	PD4RJ	-9 / -	2	Partial capture
08-21 16:00	20m	- / -	DL5MO	-8 / -	2	Partial capture
08-21 15:52	20m	- / -	PD4RJ	-10 / -	2	Partial capture
08-21 15:47	20m	- / -	PD4RJ	-18 / -	2	Partial capture
08-21 15:46	20m	- / +1	DL4ME	+15 / -	6	✓ Closing fragment
08-21 15:43	20m	- / -	PD4RJ	-14 / -	3	Partial capture
08-21 15:41	20m	- / -2	DK6JT	-14 / -	2	✓ Closing fragment
08-21 15:32	20m	- / -	DB1AD	-8 / -	2	Partial capture
08-21 15:32	20m	- / -	PD4RJ	-17 / -	4	Partial capture
08-21 15:31	20m	- / -	CT1BFP	-17 / -	5	Partial capture
08-21 15:26	20m	- / -	PD4RJ	-15 / -	3	Partial capture
08-21 15:11	20m	- / -	PD4RJ	-17 / -	2	Partial capture
08-21 15:05	20m	- / -12	DL3RN	-4 / -	4	✓ Closing fragment
08-21 14:47	20m	- / -	DL0GEO	-3 / -	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
050100  +4  989  R4FBJ S50XX JN65
050430  -7 1319  R4FBJ SP8HDC KO00 (x3)
051000  -7 1026  R4FBJ RA3DAD KO95 (x3)
051330  +6 2117  R4FBJ EU2ABM KO43 (x5)
052315 -18 1100  CQ R4FBJ KO84
052000 -22 1900  R4FBJ R5DT -06 (x2)

20m

UTC    dB Audio  Message
193845 -18 2105  R4FBJ SP6EFY JO72 (x2)
193915  -9 1423  R4FBJ PD4RJ JO33
194015  +6 2105  R4FBJ SP6EFY JO72 (x5)
194945 -11 1423  R4FBJ PD4RJ JO33
082030  +0 1641  R4FBJ IV3APC JN66 (x2)
075315 -18 2412  R4FBJ IK5PWQ JN53 (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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