8B81JB — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Indonesia

Receiver-side FT8 activity involving 8B81JB, decoded by SO8OO in southeastern Poland. 511 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-08-11 and 2026-08-20.

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 511 FT8 messages attributed to 8B81JB as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (88%), followed by 40 m (12%). Most decodes (82%) 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 -14 dB.

Overview

511

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

40m · 61 20m · 450

First attributed message: 2026-08-11
Last attributed message: 2026-08-20 23:55 UTC

Observed FT8 message patterns

Attributed sample: 511 messages
Active dates: 6 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -20 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 201, moderate (-15 to -9 dB) 244, strong (≥ -8 dB) 66.

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 8B81JB in decoded directed-looking exchanges:

EA/SQ1DOZ · Spain ×5 CT1END/P · Portugal ×4 947KIP/R ×4 OZ5ESB/LH · Denmark ×4 DL70ESSEN · Fed. Rep. of Germany ×4 RX3DPK/LH · European Russia ×3 RA3RFT/1 · European Russia ×3 OZ2NYB/LH · Denmark ×3 R2EA/P · European Russia ×3 AO25FDM · Spain ×3 ZL1RPC/P · New Zealand ×3 HA/G4RCR · Hungary ×3

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.

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	8B81JB S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-20 23:55	20m	-19 / -	<...>	-6 / -	2	✓ Closing fragment
08-20 23:26	20m	-12 / -	<...>	+1 / -	2	✓ Closing fragment
08-20 23:18	40m	-18 / -	<...>	+9 / -	3	✓ Closing fragment
08-20 23:16	20m	-13 / -	ER1WK/QRP	- / -	3	✓ Closing fragment
08-20 22:55	40m	-16 / -	<...>	-17 / -	7	✓ Closing fragment
08-20 22:46	40m	- / -	<...>	-6 / -	3	✓ Closing fragment
08-20 22:18	40m	- / -	I3LID	-3 / -	2	Partial capture
08-20 22:17	40m	- / -	EN35UKR	-11 / -	3	✓ Closing fragment
08-20 22:15	40m	- / -	DG9UBF	-14 / -	3	Partial capture
08-20 22:05	40m	- / -	PD2V	+7 / -	4	Partial capture
08-20 22:03	40m	- / -13	G4FAL	-3 / -	4	Partial capture
08-20 22:02	40m	- / -	<...>	+4 / -	3	✓ Closing fragment
08-20 22:02	40m	- / -	DL6RS	+5 / -	5	Partial capture
08-20 22:02	40m	- / -	M0WID	+3 / -	4	Partial capture
08-20 21:59	40m	- / -	SP7NC	-8 / -	2	Partial capture
08-20 21:47	40m	- / -19	DL1ESZ	-3 / -	3	Partial capture
08-20 21:47	40m	- / -15	PD2V	0 / -	3	Partial capture
08-20 20:56	40m	- / -	<...>	-12 / -	2	✓ Closing fragment
08-20 20:46	40m	- / -	<...>	-9 / -	3	✓ Closing fragment
08-20 20:46	40m	- / -15	G0GFC	-7 / -	2	Partial capture
08-20 20:41	40m	- / -	EW8FG	+10 / -	2	Partial capture
08-20 20:41	40m	- / -23	F4ENK	+1 / -	3	Partial capture
08-20 20:41	40m	- / -	G0GFC	-14 / -	2	Partial capture
08-20 20:21	20m	-22 / -	<...>	+1 / -	2	✓ Closing fragment
08-20 20:03	20m	-14 / -	<...>	-5 / -	4	✓ Closing fragment
08-20 19:48	20m	-10 / -	<...>	-5 / -	2	✓ Closing fragment
08-20 19:24	20m	- / -	<...>	+1 / -	2	✓ Closing fragment
08-20 19:20	20m	- / -	RA3RFT/1	-3 / -	3	✓ Closing fragment
08-20 19:10	20m	-12 / -	<...>	+6 / -	5	✓ Closing fragment
08-20 18:41	20m	- / -	F1RAU	+3 / -	3	Partial capture
08-20 18:41	20m	-10 / -	DK3DUA	- / -	3	✓ Closing fragment
08-20 18:35	20m	-10 / -	<...>	- / -	2	✓ Closing fragment
08-20 18:25	20m	- / -7	DL8HXP	-2 / -	2	Partial capture
08-20 18:23	20m	-10 / -	<...>	+4 / -	8	✓ Closing fragment
08-20 18:18	20m	-12 / -	<...>	+6 / -	4	✓ Closing fragment
08-20 18:10	20m	-12 / -	<...>	-9 / -	6	✓ Closing fragment
08-20 18:07	20m	-8 / -	<...>	+11 / -	2	✓ Closing fragment
08-20 18:00	20m	-14 / -	<...>	- / -	2	✓ Closing fragment
08-20 17:45	20m	-9 / -	<...>	- / -	2	✓ Closing fragment
08-20 17:42	20m	-9 / -	<...>	+10 / -	2	✓ Closing fragment
08-20 17:21	20m	-14 / -	<...>	-8 / -	4	✓ Closing fragment
08-20 17:18	20m	-6 / -	<...>	-6 / -	2	✓ Closing fragment
08-20 17:02	20m	- / -	PC5D	-5 / -	8	Partial capture
08-20 17:02	20m	-8 / -	<...>	+2 / -	9	✓ Closing fragment
08-20 16:55	20m	-10 / -	<...>	0 / -	2	✓ Closing fragment
08-20 16:50	20m	-10 / -	<...>	-10 / -	3	✓ Closing fragment
08-20 16:47	20m	- / -14	M8DBS	-12 / -	2	Partial capture
08-20 16:47	20m	-6 / -	<...>	+9 / -	2	✓ Closing fragment
08-20 16:43	20m	-10 / -	<...>	-10 / -	2	✓ Closing fragment
08-20 16:43	20m	- / -	R6TJ	-4 / -	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
233045 -11 1774  CQ 8B81JB (x12)
234945 -19 1771  <...> 8B81JB RR73 (x2)
235600  -6 1148  8B81JB <...> 73

40m

UTC    dB Audio  Message
231030 -16 1734  <...> 8B81JB RR73
231100 -20 1733  CQ 8B81JB (x2)
231215 -21 1734  8B81JB DL8HXP
231500 -18 1734  CQ 8B81JB (x3)
231830 -19 1734  <...> 8B81JB RR73
231845  +1 2285  8B81JB II7MGXX 73
231845  -5 2731  <8B81JB> UR9QQ KN77
231900 -16 1734  <...> 8B81JB RR73
231945  +9  838  8B81JB <...> 73
231945  +3  651  <8B81JB> M0HJJ IO91
232100 -16 1734  CQ 8B81JB (x2)

10m

UTC    dB Audio  Message
144445 -11  840  <8B81JB> DK7ZT -12 (x3)
092245  -5 2272  8B81JB <...> 73 (x6)
141330  -9  720  <8B81JB> IK5PWQ R-10
141330 -17 1758  8B81JB <...> 73 (x5)

80m

UTC    dB Audio  Message
181815 +21 1756  8B81JB <...> 73
181845 +24 3004  8B81JB SQ9LOJ JO90 (x3)
182445 +15 2797  8B81JB OH5LF (x2)
182615 +20 2502  8B81JB <...> RR73 (x3)
190415  -2  398  8B81JB UW5KW/QRP 73
191045  +4  987  8B81JB <...> 73
193215  +3 1054  <8B81JB> IK0SHH JN62
193215  +9 1552  8B81JB YO1BRANCUSI 73
193415  +7 1054  <8B81JB> IK0SHH JN62
193415 +14 2405  8B81JB OH/SM5MRW 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.

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