UA4SJB — 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: LO36

Receiver-side FT8 activity involving UA4SJB, decoded by SO8OO in southeastern Poland. 438 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 47 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-11-04.

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 438 FT8 messages attributed to UA4SJB as the transmitting token by decoded message structure across 47 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (46%), followed by 20 m (34%) and 40 m (17%). Most decodes (62%) 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 -15 dB.

Overview

438

Messages attributed

UTC dates decoded

134

Active 15-min windows

-15 dB

Estimated median S/N

Bands

160m · 13 80m · 203 40m · 75 20m · 147

First attributed message: 2026-06-07
Last attributed message: 2026-11-04 19:19 UTC

Observed FT8 message patterns

Attributed sample: 438 messages
Active dates: 47 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -22 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 202, moderate (-15 to -9 dB) 137, strong (≥ -8 dB) 99.

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 UA4SJB in decoded directed-looking exchanges:

R8QA · Asiatic Russia ×3 UB1Q · European Russia ×2 UG4L · European Russia ×2 RA1TR · European Russia ×2 ES2AJ · Estonia R1BQW · European Russia R2FC · Kaliningrad R3EDX · European Russia R3ZMM · European Russia R3ZP · European Russia R4FDD · European Russia R4LQ · 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 UA4SJB

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: LO36 · 108 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,817 km (approx.)
Last such locator decoded: 2026-11-01 03:39 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	UA4SJB S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-04 19:10	80m	-17 / 0	UA3UCS	-6 / -7	4	✓ Full exchange observed
11-04 15:30	40m	- / -4	RA1N	+2 / -	3	✓ Closing fragment
11-04 15:29	40m	- / -8	RX9WM	-14 / -	3	✓ Closing fragment
11-03 15:52	80m	- / -12	RZ3ZY	-12 / -	3	✓ Closing fragment
11-03 15:51	80m	- / -17	RZ6HTP	-2 / -	2	✓ Closing fragment
11-01 16:18	160m	- / -	R6ML	-18 / -	2	Partial capture
11-01 16:15	160m	- / -13	RL3DI	-18 / -	3	✓ Closing fragment
11-01 14:58	80m	-24 / -	RA6FCU/P	- / -14	2	Partial capture
11-01 14:54	80m	-22 / -	RA6FCU/P	- / -18	3	Partial capture
11-01 03:35	80m	- / -	F4FLF	-6 / -	2	Partial capture
11-01 03:31	80m	-16 / -	RA3RPW	-13 / -12	3	✓ Closing observed
11-01 03:30	80m	-16 / -	RA6FCU/P	- / -17	2	✓ Closing fragment
10-31 02:40	40m	-16 / -	PV8AJ	- / -19	2	Partial capture
10-31 02:39	40m	-20 / -	EY7BP	- / -18	2	Partial capture
10-31 02:35	40m	-20 / -	R4ADE	- / -9	2	✓ Closing fragment
10-30 05:27	40m	- / -	DL8WEM	+10 / -	2	Partial capture
10-29 19:23	160m	- / -9	RN1ON	-11 / -	2	✓ Closing fragment
10-29 19:16	160m	- / -15	R7OF	-18 / -	2	✓ Closing fragment
10-29 19:13	160m	- / -22	R6OD	-11 / -	3	✓ Closing fragment
10-29 19:09	160m	- / -25	DK7ZT	-10 / -	5	Partial capture
10-29 19:08	160m	- / -7	UB1Q	-22 / -	2	✓ Closing fragment
10-29 17:56	160m	- / -19	R7AW	-18 / -	2	Partial capture
10-29 17:41	80m	-18 / -	UA4NIA	- / -2	2	Partial capture
10-28 17:19	40m	- / -6	RA6OD	-12 / -	3	✓ Closing fragment
10-27 20:08	160m	- / -23	DK7ZT	-4 / -	5	Partial capture
10-27 20:05	160m	- / -	IK6GPZ	-6 / -	3	Partial capture
10-27 18:05	160m	- / -	RO7A	-12 / -	2	Partial capture
10-27 18:02	160m	- / 0	UA3EDQ	-8 / -	2	✓ Closing fragment
10-27 17:23	160m	- / -20	RJ3DC	-18 / -	3	✓ Closing fragment
10-27 17:15	80m	-14 / -	RA0SCA	- / -24	2	Partial capture
10-27 17:11	80m	-14 / -	R8QA	- / -14	2	✓ Closing fragment
10-27 16:17	40m	- / -9	OM2IB	-20 / -	2	✓ Closing fragment
10-27 16:09	40m	-12 / -	UA9UFJ	- / -11	2	✓ Closing fragment
10-27 15:33	40m	- / -10	R8QA	-18 / -	2	✓ Closing fragment
10-26 19:17	80m	-20 / -	UF2F	- / -13	2	✓ Closing fragment
10-26 19:08	80m	- / -	DF8RU	-5 / -	4	Partial capture
10-26 19:07	80m	- / +1	R5BS	-8 / -	2	✓ Closing fragment
10-26 19:01	80m	- / -	DL6UM	+4 / -	7	Partial capture
10-26 17:42	80m	- / -13	R6ZAS	-18 / -	2	Partial capture
10-24 20:03	160m	- / -8	R6FX	-18 / -	2	✓ Closing fragment
10-24 19:11	160m	- / -10	R7OF	-11 / -	2	Partial capture
10-24 19:08	160m	- / -9	R5AV	0 / -	2	✓ Closing fragment
10-24 18:18	160m	- / -14	R3ZMM	-19 / -	3	✓ Closing fragment
10-24 18:18	160m	- / -24	RN7T	-10 / -	3	✓ Closing fragment
10-24 18:08	160m	- / -9	R2DRE	-19 / -	4	Partial capture
10-24 17:33	160m	- / +1	RN1NEB	-13 / -	3	✓ Closing fragment
10-24 17:20	160m	- / +3	RA3UEV	-8 / -	2	✓ Closing fragment
10-24 16:55	160m	- / -23	RA3LBW	-3 / -	5	✓ Closing fragment
10-24 16:41	80m	- / -13	EU1AFX	+8 / -	2	✓ Closing fragment
10-24 15:52	80m	-16 / -	UB3BDB	- / -24	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
191115  -3 1757  UA4SJB DK7ZT -25
191330 -11  981  UA4SJB R6OD R-22 (x3)
191630 -19 1590  UA4SJB R7OF R-15 (x2)
192330 -13 1307  UA4SJB RN1ON R-09 (x2)
161500 -19 1594  UA4SJB RL3DI R-13 (x3)
161730 -11 1556  UA4SJB R4LQ 73
161830 -18 1048  UA4SJB R6ML LN17 (x2)
203500 -12 2102  UA4SJB RK3BM 73

80m

UTC    dB Audio  Message
145815 -23 1937  RA6FCU/P UA4SJB -14 (x2)
155115  -3  723  UA4SJB RZ6HTP R-17 (x2)
155215 -12 1428  UA4SJB RZ3ZY KO90 (x3)
185045 -14 1855  UA4SJB RZ3DAB R-11
190145 -17  856  ON3MOH/P UA4SJB -18
191045 -17  900  UA3UCS UA4SJB -07 (x2)
191200 -10 1500  UA4SJB UA3UCS R+00 (x2)
191345 -15  900  RD7LO UA4SJB RR73
191915 -16  922  R3XBB UA4SJB -12

40m

UTC    dB Audio  Message
024045 -17 2044  PV8AJ UA4SJB -19 (x2)
024215  -8 2362  CQ UA4SJB LO36 (x2)
024415 -17 1183  PV8AJ UA4SJB -19 (x2)
025945 -19 1181  EY7BP UA4SJB -18
031230 -14  540  ZP5DBC UA4SJB -13
152900 -14 1997  UA4SJB RX9WM LO74 (x3)
153030  +4  381  UA4SJB RA1N KP71 (x3)
153300 -20 1508  UA4SJB UB3FBD R-13

10m

UTC    dB Audio  Message
090700 -17 1221  UA4SJB R7LB LN17

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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