YB0KEM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Indonesia Most frequent locator attributed to this token: OI33

Receiver-side FT8 activity involving YB0KEM, decoded by SO8OO in southeastern Poland. 179 FT8 messages attributed to this token as transmitter, on 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-08-20 and 2026-08-31.

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 179 FT8 messages attributed to YB0KEM as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (97%) fell within the six-hour window 13:00-19:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

179

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

20m · 179

First attributed message: 2026-08-20
Last attributed message: 2026-08-31 15:15 UTC

Observed FT8 message patterns

Attributed sample: 179 messages
Active dates: 10 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -18 to -6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 37, moderate (-15 to -9 dB) 97, strong (≥ -8 dB) 45.

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 YB0KEM in decoded directed-looking exchanges:

EA2EWL · Spain ×2 UA9TO · Asiatic Russia ×2 4S6YRW · Sri Lanka 9K2YM · Kuwait A61DD · United Arab Emirates EA3EQS · Spain EA5ISM · Spain EC5M · Spain ES2AJ · Estonia F6DZU · France HB9ACA · Switzerland IK2JYT · Italy

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 YB0KEM

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: OI33 · 118 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 10,219 km (approx.)
Last such locator decoded: 2026-08-31 14:45 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	YB0KEM S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-31 15:15	20m	- / -	F4LQJ	+4 / -	2	Partial capture
08-31 15:12	20m	-14 / -	LA2GCA	- / -8	3	Partial capture
08-31 15:10	20m	- / -	EI4JFB	-6 / -	2	Partial capture
08-31 15:09	20m	- / -4	PA5KK	-7 / -	10	Partial capture
08-31 15:09	20m	- / -	ON6AA	+30 / -	4	Partial capture
08-31 15:08	20m	- / -	PD0RDD	-2 / -	4	Partial capture
08-31 14:41	20m	- / -	M0RJV	0 / -	2	Partial capture
08-31 14:41	20m	-9 / -	KS4OT	- / -	7	Partial capture
08-31 14:36	20m	- / -	M7PHE	-9 / -	2	Partial capture
08-31 14:36	20m	- / -21	PD8RUK	+2 / -	8	Partial capture
08-31 14:36	20m	-6 / -	OH3MB	- / +3	2	Partial capture
08-31 14:36	20m	- / -	R7IW	-14 / -	4	Partial capture
08-31 14:27	20m	- / -	DL9MCS	+12 / -	2	Partial capture
08-31 14:23	20m	- / -21	PD8RUK	+3 / -	6	Partial capture
08-31 14:21	20m	-11 / -	4S6YRW	- / -4	5	✓ Closing fragment
08-31 14:18	20m	- / -14	LX1JH	+7 / -	4	Partial capture
08-31 14:07	20m	-18 / -	KS4OT	- / -	3	Partial capture
08-31 13:46	20m	-14 / -	KS4OT	- / -	2	Partial capture
08-31 13:42	20m	- / -	ON2AJ	+4 / -	12	Partial capture
08-31 13:39	20m	-17 / -12	LX1TI	+5 / -16	6	✓ Full exchange observed
08-31 13:37	20m	-17 / -	KS4OT	- / -	3	Partial capture
08-30 19:15	20m	- / -	F4MZO	-18 / -	3	Partial capture
08-30 19:14	20m	- / -	M7NXS	-12 / -	4	Partial capture
08-30 19:13	20m	-16 / -3	IU2NBZ	0 / -22	5	✓ Full exchange observed
08-30 18:58	20m	- / -	CT1FIU	-2 / -	4	Partial capture
08-30 18:55	20m	- / -	G1BJC	-1 / -	9	Partial capture
08-30 18:55	20m	- / -	G4SJG	-6 / -	4	Partial capture
08-30 18:52	20m	- / -11	EA7L	-8 / -	3	Partial capture
08-30 18:48	20m	- / -	IN3EJX	-10 / -	6	Partial capture
08-30 18:46	20m	- / -	EA2BHE	-12 / -	2	Partial capture
08-30 18:46	20m	-10 / +8	SM6UQL	-12 / -	3	Partial capture
08-30 18:45	20m	- / -	RC5F	-3 / -	3	Partial capture
08-30 18:45	20m	- / -	EA7L	+4 / -	5	Partial capture
08-30 18:45	20m	- / -7	IZ2ACM	+14 / -	4	✓ Closing fragment
08-30 18:44	20m	- / -8	EA1AUO	+14 / -	2	Partial capture
08-30 18:41	20m	- / -13	IZ2PRI	-8 / -	2	Partial capture
08-30 18:34	20m	-13 / -	IU3MAG	-1 / -10	5	Partial capture
08-30 18:33	20m	- / -	M0BOV	-17 / -	3	Partial capture
08-30 18:30	20m	- / -	EA1EMO	-2 / -	4	Partial capture
08-30 18:30	20m	- / -16	EA3EQS	+9 / -	3	✓ Closing fragment
08-30 18:30	20m	- / -	M0LAD	-4 / -	5	Partial capture
08-30 18:27	20m	-14 / -	DL2TM	- / -14	2	Partial capture
08-30 18:21	20m	- / -	DJ9NY	-2 / -	2	Partial capture
08-30 18:21	20m	- / -	PD0OKP	-17 / -	2	Partial capture
08-30 18:21	20m	- / -	M0LAD	-16 / -	2	Partial capture
08-30 18:20	20m	- / -17	PD0JOY	-11 / -	17	✓ Closing fragment
08-30 18:20	20m	- / -	IK1EVX	-1 / -	3	Partial capture
08-30 18:19	20m	- / -	TA4SSK	-11 / -	3	Partial capture
08-30 18:18	20m	- / -	HA7XL	-18 / -	3	Partial capture
08-30 18:16	20m	- / -	RW9WC	-16 / -	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
151115  -5 1777  YB0KEM PA5KK -04
151115  -3 1001  YB0KEM EI4JFB IO63
151145  -4 1471  YB0KEM R7IW LN35
151145  -5 1778  YB0KEM PA5KK -04 (x2)
151230 -15 1411  LA2GCA YB0KEM -08
151245  -2 1777  YB0KEM PA5KK -04 (x2)
151330 -11 1412  LA2GCA YB0KEM -08
151345 -10 1777  YB0KEM PA5KK -04 (x2)
151530 -15 1412  LA2GCA YB0KEM -08
151545  +4 1412  YB0KEM F4LQJ JN23 (x2)
164200 -24 1829  YB0KEM PA5VL -03

10m

UTC    dB Audio  Message
110730 -16 1066  YB0KEM DN9SHA JO31
110730 -13 1417  YB0KEM 9A4ZM JN86
110830 -15 1066  YB0KEM DN9SHA JO31
110900  -5 1124  YB0KEM DL3MIB JN57
110900  -6 1421  YB0KEM DG2SAT JN48
110930  -8 1125  YB0KEM DL3MIB JN57
110930  -9 1421  YB0KEM DG2SAT JN48
111000  -4 1124  YB0KEM DL3MIB JN57
111000  -8 1421  YB0KEM DG2SAT JN48
111030  -3 1124  YB0KEM DL3MIB JN57
111030 -10 1420  YB0KEM DG2SAT JN48
111100  -3 1124  YB0KEM DL3MIB JN57 (x3)
112800  -9 1399  YB0KEM LZ4VR KN13

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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