KB1EFS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: FN14

Receiver-side FT8 activity involving KB1EFS, decoded by SO8OO in southeastern Poland. 987 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 27 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-09-07.

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 987 FT8 messages attributed to KB1EFS as the transmitting token by decoded message structure across 27 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (38%), followed by 80 m (36%) and 20 m (25%). Most decodes (87%) fell within the six-hour window 22:00-04:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12.9 dB.

Overview

987

Messages attributed

UTC dates decoded

114

Active 15-min windows

-12.9 dB

Estimated median S/N

Bands

80m · 359 40m · 378 20m · 250

First attributed message: 2026-06-11
Last attributed message: 2026-09-07 02:03 UTC

Observed FT8 message patterns

Attributed sample: 987 messages
Active dates: 27 UTC dates
Estimated median S/N: -12.9 dB
Estimated 10th-90th percentile: -21 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 311, moderate (-15 to -9 dB) 373, strong (≥ -8 dB) 303.

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 KB1EFS in decoded directed-looking exchanges:

F1PBZ · France ×4 PA2EW · Netherlands ×3 HI8JCD · Dominican Republic ×2 MM0KQC · Scotland ×2 EA8AR · Canary Islands ×2 W3HVG · United States ×2 N0XRG · United States ×2 IN3IZQ · Italy ×2 LY7M · Lithuania ×2 LB5JK · Norway ×2 KA3PMW · United States ×2 UA2KU · Kaliningrad

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 KB1EFS

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: FN14 · 553 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 6,917 km (approx.)
Last such locator decoded: 2026-08-31 02:59 UTC

Other locator fields attributed to this token: FN41 (26).

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	KB1EFS S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-07 22:11	40m	- / -17	DL5YAS	-6 / -	3	Partial capture
09-07 21:57	40m	- / -	EA5JLN	-10 / -	6	Partial capture
09-07 21:51	40m	- / -	DG5PW	-10 / -	5	Partial capture
09-07 21:34	40m	- / -15	M0THH	-21 / -	4	Partial capture
09-07 21:25	40m	- / -19	SP6CA	-5 / -	3	✓ Closing fragment
09-07 21:21	40m	- / -13	HB9FUR	-2 / -	2	✓ Closing fragment
09-06 02:22	40m	- / -	F4HQB	-4 / -	2	Partial capture
09-06 01:47	40m	- / -20	EG3PDA	-2 / -	3	✓ Closing fragment
09-05 23:41	40m	- / +7	K2SAB	-15 / -	2	Partial capture
09-05 23:25	40m	- / 0	GW4NOO	-10 / -	4	✓ Closing fragment
09-05 23:13	40m	- / -	MW7PPO	-16 / -	2	Partial capture
09-05 22:57	40m	- / -2	OZ2NYB/P	-7 / -	8	✓ Closing fragment
09-05 22:10	40m	- / -	OZ2NYB/P	-5 / -	2	Partial capture
09-05 21:59	40m	- / -8	OZ2NYB/P	-10 / -	2	Partial capture
09-04 02:37	40m	- / -19	R3PK	-4 / -	2	Partial capture
08-31 17:24	20m	- / -	DL5ALF	-13 / -	2	Partial capture
08-31 17:21	20m	- / -14	PD5DSL	-8 / -	3	✓ Closing fragment
08-31 16:59	20m	- / -	PD3FR	+5 / -	2	Partial capture
08-31 16:50	20m	- / -23	PD0RDD	-6 / -	3	✓ Closing fragment
08-31 16:49	20m	- / -	IK2LRF	-10 / -	4	Partial capture
08-31 16:46	20m	- / -22	PD0WL	-14 / -	4	✓ Closing fragment
08-31 16:23	20m	- / -	M9LHX	-1 / -	3	Partial capture
08-31 16:18	20m	- / -	M9LHX	-1 / -	4	Partial capture
08-31 15:15	20m	- / -25	DF8DR	+1 / -	17	Partial capture
08-31 14:54	20m	- / -16	DG1KFR	-2 / -	6	Partial capture
08-31 14:43	20m	- / -19	G7SQC	-4 / -	3	Partial capture
08-31 14:36	20m	- / -5	GM0DYU	-4 / -	3	✓ Closing fragment
08-31 14:13	20m	- / -	M9TMC	-11 / -	3	Partial capture
08-31 13:51	20m	- / -13	ON2AJ	-4 / -	4	Partial capture
08-31 12:41	20m	- / -	PA4RFS	-5 / -	3	Partial capture
08-31 12:41	20m	- / -	M0LAD	+3 / -	6	Partial capture
08-31 12:37	20m	- / -	IK4LZH	-8 / -	2	Partial capture
08-31 12:36	20m	- / -17	PD0PET	-2 / -	6	Partial capture
08-31 12:36	20m	- / 0	OO0O	+7 / -	13	Partial capture
08-31 12:26	20m	- / -	PD3LKN	-8 / -	2	Partial capture
08-31 12:25	20m	- / -	RA9UO	-16 / -	4	Partial capture
08-31 12:20	20m	- / -11	DL4JG	-14 / -	2	Partial capture
08-31 12:17	20m	- / -17	F5IXN	+6 / -	3	✓ Closing fragment
08-31 12:10	20m	- / -16	IU1CYA	+8 / -	2	Partial capture
08-31 02:59	80m	- / -16	DO1OAS	0 / -	2	Partial capture
08-31 02:53	80m	- / -20	DO1OAS	-2 / -	8	Partial capture
08-31 02:51	80m	- / -13	F4EZJ	+16 / -	5	✓ Closing fragment
08-31 02:45	80m	-24 / -13	DJ1OJ	+14 / -12	13	Partial capture
08-31 02:45	80m	- / -20	EW6BZ	+2 / -	2	Partial capture
08-31 02:41	80m	- / -16	DO1OAS	-6 / -	5	Partial capture
08-31 02:41	80m	- / -	SM7XON	+2 / -	2	Partial capture
08-31 02:40	80m	- / -16	UR5SG	+14 / -	2	Partial capture
08-31 02:38	80m	-24 / -	KD8TO	- / -13	2	✓ Closing fragment
08-31 02:35	80m	- / -	IK6QRE	+2 / -	2	Partial capture
08-31 02:30	80m	- / -13	DD7EE	+6 / -	10	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
213730 -18 1135  KB1EFS M0THH R-15
215130 -10 1980  KB1EFS DG5PW JO30 (x5)
215700  -9 1736  KB1EFS EA5JLN IM99 (x6)
221100  -7 1980  KB1EFS DL5YAS JO31 (x3)

80m

UTC    dB Audio  Message
025445 +19 2334  KB1EFS F4EZJ 73
025445  -4 1600  KB1EFS DO1OAS -20 (x5)
025700 -24 1601  CQ KB1EFS FN14 (x4)
025945  +1 1601  KB1EFS DO1OAS -16 (x2)
015830 +17 2725  KB1EFS SO100PKP -21
015900 +23 2725  KB1EFS RR73; R3LDK <...> +04
020330 -24  984  CQ KB1EFS FN41                        a1

20m

UTC    dB Audio  Message
165045  -4 2021  KB1EFS PD0RDD JO22 (x3)
165245  -7 2124  KB1EFS IK2LRF JN45
165945  +7 2021  KB1EFS PD3FR JO22 (x2)
170315  +5 2021  KB1EFS OE5NVL JN67
170745  +6 2021  KB1EFS HB9BXS R-13
171915  +3 2021  KB1EFS PD8XXX JO22
172115  -8 2021  KB1EFS PD5DSL JO22 (x3)
172415 -12 1722  KB1EFS DL5ALF JN48 (x2)
173315 -14  777  KB1EFS EA4HHN -13

10m

UTC    dB Audio  Message
182130 -20 1903  KB1EFS PU2XEE -18
201300 -17 2278  KB1EFS DN9OPA JN38 (x5)
131445 +10  628  KB1EFS HB9CTU JN47 (x3)
145100 -21 1341  KB1EFS F4LWD RR73
150115 -22 1654  KB1EFS SV0LS KN00

160m

UTC    dB Audio  Message
015145 -18 1097  KB1EFS DO8DL JO40

60m

UTC    dB Audio  Message
020530  -1 2133  KB1EFS ER3UA KN37
020530  +1 1992  KB1EFS DL3VZL R-11
020700 -24 1886  KB1EFS W1ARY FN31
020700 -10  625  KB1EFS G0AZH IO83 (x2)
020730 -23 1886  KB1EFS W1ARY R+03
020830  -8 2321  KB1EFS HB9DGR JN47
022030 -17 2057  KB1EFS IW0HAC JN61 (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.

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