KF8EXX — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM98

Receiver-side FT8 activity involving KF8EXX, decoded by SO8OO in southeastern Poland. 550 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 16 UTC dates in the available aggregate history. Observed between 2026-06-30 and 2026-09-15.

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 550 FT8 messages attributed to KF8EXX as the transmitting token by decoded message structure across 16 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (34%), followed by 40 m (33%) and 20 m (32%). Most decodes (93%) fell within the six-hour window 23:00-05:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

550

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 188 40m · 184 20m · 178

First attributed message: 2026-06-30
Last attributed message: 2026-09-15 04:25 UTC

Observed FT8 message patterns

Attributed sample: 550 messages
Active dates: 16 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -19 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 153, moderate (-15 to -9 dB) 272, strong (≥ -8 dB) 125.

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 KF8EXX in decoded directed-looking exchanges:

F1PBZ · France ×3 RA2FCF · Kaliningrad ×3 4X1UF · Israel ×2 CN8NS · Morocco ×2 F5OYA/P · France ×2 R2EC · European Russia ×2 R7DX · European Russia ×2 UT2AU · Ukraine ×2 DG1KPC · Fed. Rep. of Germany ×2 DL1UDO · Fed. Rep. of Germany ×2 DL2RPN · Fed. Rep. of Germany ×2 F5RRS · France ×2

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 KF8EXX

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: EM98 · 217 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,628 km (approx.)
Last such locator decoded: 2026-09-15 04:05 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	KF8EXX S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 05:53	80m	- / -11	F4GUK	-8 / -	3	✓ Closing fragment
09-15 05:30	80m	- / -17	ON7DJ	-2 / -	3	✓ Closing fragment
09-15 05:26	80m	- / -17	HB3YFC	-8 / -	5	✓ Closing fragment
09-15 05:24	80m	- / -3	ON7HM	-17 / -	3	✓ Closing fragment
09-15 05:24	80m	- / -12	PA3CPS	+3 / -	3	✓ Closing fragment
09-15 05:16	80m	- / -19	G8OO	-11 / -	5	✓ Closing fragment
09-15 05:13	80m	- / -2	F5BZB	0 / -	2	✓ Closing fragment
09-15 05:00	80m	- / -4	F6FTB	-6 / -	3	✓ Closing fragment
09-15 04:56	80m	- / -	IZ2ACM	-17 / -	3	Partial capture
09-15 04:54	80m	- / -	OZ1BLP	-9 / -	5	Partial capture
09-15 04:49	80m	- / -14	F5NNN	-12 / -	2	✓ Closing fragment
09-15 04:47	80m	- / -17	DL2HUC	-3 / -	4	✓ Closing fragment
09-15 04:46	80m	- / -	PE1NMM	-12 / -	2	Partial capture
09-15 04:45	80m	- / -	HB9ALO	-14 / -	2	Partial capture
09-15 04:42	80m	- / -12	DJ1NE	-7 / -	3	✓ Closing fragment
09-15 04:38	80m	- / -12	G4ZAM	-11 / -	2	Partial capture
09-15 04:30	80m	- / -20	IN3WZS	-3 / -	3	✓ Closing fragment
09-15 04:24	80m	-16 / -6	IV3GHY	+11 / -11	4	✓ Full exchange observed
09-15 04:24	80m	-19 / -13	DL2RPN	-6 / -14	6	✓ Full exchange observed
09-15 04:24	80m	- / -25	DO1ID	+10 / -	6	✓ Closing fragment
09-15 04:20	80m	-22 / -13	G4ZAM	-16 / -19	6	Partial capture
09-15 04:17	80m	- / -15	YO8RAW	-3 / -	6	Partial capture
09-15 04:12	80m	- / -	HB9ALO	-12 / -	11	Partial capture
09-15 04:12	80m	-24 / -19	LY7T	+7 / -8	9	Partial capture
09-15 04:11	80m	- / -13	SP6JIU	+16 / -	3	✓ Closing fragment
09-15 04:11	80m	- / -	YO8RAW	-6 / -	4	Partial capture
09-15 04:10	80m	- / -	DL1UDO	-1 / -	3	Partial capture
09-15 04:08	80m	- / -16	ON1JP	-10 / -	5	Partial capture
09-15 03:50	40m	- / -	R2BT	+8 / -	3	Partial capture
09-15 03:46	40m	- / -	R2BT	+5 / -	3	Partial capture
09-15 03:40	40m	- / -24	RA6OY	+2 / -	7	✓ Closing fragment
09-15 03:38	40m	- / -	R2BT	+6 / -	5	Partial capture
09-15 03:32	40m	- / -11	RK6A	+10 / -	6	✓ Closing fragment
09-15 03:32	40m	- / -3	F5UOU	-2 / -	2	Partial capture
09-15 03:23	40m	-14 / -15	SV1MOZ	0 / -25	5	✓ Full exchange observed
09-15 03:17	40m	-6 / -	US1VM	- / -12	3	Partial capture
09-15 03:13	40m	-9 / -2	TA2EE	-16 / -21	9	✓ Full exchange observed
09-15 03:07	40m	- / -	UA6AKW	-4 / -	2	Partial capture
09-15 02:43	40m	- / -	SV1MOZ	-13 / -	5	Partial capture
09-15 02:22	80m	- / -19	E75C	+1 / -	3	Partial capture
09-15 02:18	80m	- / -14	PA4PA	-6 / -	2	✓ Closing fragment
09-15 02:10	80m	- / -18	E75C	-1 / -	2	Partial capture
09-13 05:43	80m	- / -25	F6FTB	-22 / -	2	✓ Closing fragment
09-13 05:29	80m	- / -	LA4JGA	-11 / -	5	Partial capture
09-13 05:20	80m	- / -4	ON7GB	0 / -	5	✓ Closing fragment
09-13 05:16	80m	- / -	EA5RD	-18 / -	2	Partial capture
09-12 03:05	80m	- / -	EA1IOK	-8 / -	2	Partial capture
09-12 02:44	80m	- / -	IZ2AMW	-8 / -	3	Partial capture
09-10 03:05	40m	- / -8	EA3AKY	-3 / -	3	✓ Closing fragment
09-09 05:13	40m	- / -19	F4HUN	-19 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
052430 -16 2269  KF8EXX ON7HM JO10
052500  +4  399  KF8EXX PA3CPS 73
052630 -16 2269  KF8EXX ON7HM R-03
052630  -8 1872  KF8EXX HB3YFC JN37
052700 -18 2269  KF8EXX ON7HM 73
052700  -7 1767  KF8EXX HB3YFC JN37 (x4)
053030  -3  417  KF8EXX ON7DJ JO21 (x3)
055300  -6  543  KF8EXX F4GUK JN18 (x3)

40m

UTC    dB Audio  Message
034000  +9 3016  KF8EXX R2BT KO85
034030  -3 1102  KF8EXX RA6OY KN88 (x7)
034600  +3 3015  KF8EXX R2BT KO85 (x6)
035745 -14 2588  W1AW/4 KF8EXX EM98

20m

UTC    dB Audio  Message
212430 -19 2213  KC3BTV KF8EXX R-15 (x2)
212515 -16 1198  KF8EXX AB3JS FM29
212600 -13 2214  CQ KF8EXX EM98 (x2)
212700 -12 2214  UW5KW KF8EXX -04 (x2)
212800 -13 2213  CQ KF8EXX EM98
213100  -8 2214  PA2SVD KF8EXX -24 (x3)
023630  -1 2477  KF8EXX IK2ZJR JN45 (x3)
060745 -17 2574  J88IH KF8EXX EM98

60m

UTC    dB Audio  Message
043645 -17 2132  KF8EXX PE1NPS R-21 (x2)
043730  -7 1210  KF8EXX OZ1HYM JO44
043745 -17 2132  KF8EXX PE1NPS R-21
043800  -5 1209  KF8EXX OZ1HYM JO44 (x3)

10m

UTC    dB Audio  Message
213230 -18 1193  KF8EXX EA5ET IM99 (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.

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