K4FS — 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: United States Most frequent locator attributed to this token: EM85

Receiver-side FT8 activity involving K4FS, decoded by SO8OO in southeastern Poland. 63 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 5 UTC dates in the available aggregate history. Observed between 2026-07-24 and 2026-10-27.

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 63 FT8 messages attributed to K4FS as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (54%), followed by 40 m (46%). Most decodes (98%) fell within the six-hour window 00:00-06:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's weak S/N range (68%); the estimated median was -17 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-17 dB

Estimated median S/N

Bands

80m · 34 40m · 29

First attributed message: 2026-07-24
Last attributed message: 2026-10-27 05:03 UTC

Observed FT8 message patterns

Attributed sample: 63 messages
Active dates: 5 UTC dates
Estimated median S/N: -17 dB
Estimated 10th-90th percentile: -24 to -11 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 43, moderate (-15 to -9 dB) 16, strong (≥ -8 dB) 4.

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 K4FS in decoded directed-looking exchanges:

DL3MIB · Fed. Rep. of Germany EI9KF · Ireland G5STU · England SV9AUP · Crete TA2NEH · Asiatic Turkey US0QV · Ukraine US8UX · Ukraine UW4SU · Ukraine UX1VT · Ukraine YO9IAB · Romania Z34K · North Macedonia DC8SM · Fed. Rep. of Germany

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 K4FS

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: EM85 · 11 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,995 km (approx.)
Last such locator decoded: 2026-10-27 05:03 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	K4FS S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-28 23:06	80m	- / -14	MD0CCE	+9 / -	3	✓ Closing fragment
10-27 05:11	80m	- / -9	GU4WRP	-14 / -	2	✓ Closing fragment
10-27 05:10	80m	- / -	OH1TSM	0 / -	2	Partial capture
10-27 05:08	80m	- / -11	LY1G	+5 / -	2	✓ Closing fragment
10-27 05:02	80m	-14 / -	LY5A	- / -11	2	Partial capture
10-27 04:57	40m	- / -5	IZ8NON	-2 / -	2	Partial capture
10-27 04:56	40m	-20 / -	SV9AUP	-14 / -	2	✓ Closing observed
10-27 04:56	40m	-16 / -1	Z34K	0 / -3	7	✓ Full exchange observed
10-27 04:52	40m	-18 / -15	US0QV	-4 / -16	4	✓ Full exchange observed
10-27 04:51	40m	-18 / -	UW4SU	- / -8	2	✓ Closing fragment
10-27 04:51	40m	- / -	UR9QQ	-8 / -	9	Partial capture
10-27 04:49	40m	-14 / -	F5PBG	-3 / -3	4	Partial capture
10-27 04:48	40m	-16 / -	US8UX	- / -1	2	✓ Closing fragment
10-27 04:47	40m	-12 / -	IT9ODQ	-16 / -5	3	Partial capture
10-27 04:47	40m	- / -	RU3SD	-14 / -	2	Partial capture
10-27 04:46	40m	-10 / -15	EA5JHD	-18 / -15	3	Partial capture
10-27 04:45	40m	- / -	UB3ZKO	-12 / -	2	Partial capture
10-27 04:44	40m	- / -	R6HW	-3 / -	5	Partial capture
10-27 04:43	40m	-16 / -	HB9TIH	- / -1	2	Partial capture
10-27 04:43	40m	- / -	IT9ODQ	-19 / -	2	Partial capture
10-27 04:43	40m	- / -2	IZ8EYN	-16 / -	4	Partial capture
10-27 04:43	40m	- / -	RQ7R	-18 / -	2	Partial capture
10-27 04:42	40m	- / -	RA3YAO	-17 / -	15	Partial capture
10-27 04:41	40m	-12 / -	YO9IAB	- / -2	2	✓ Closing fragment
10-27 04:41	40m	- / -	IU8RFW	-5 / -	4	Partial capture
10-27 04:41	40m	-10 / -10	UX1VT	-3 / -9	8	✓ Full exchange observed
10-27 04:38	40m	-16 / -	TL8GD	- / -	2	Partial capture
10-27 04:18	80m	- / -25	OH5BM	+4 / -	7	Partial capture
10-27 04:10	80m	- / -9	EC3A	-12 / -	2	✓ Closing fragment
10-27 04:07	80m	- / -11	DO1FHQ	0 / -	6	✓ Closing fragment
10-27 04:05	80m	-24 / -	N7ENS	- / -12	2	✓ Closing fragment
10-27 04:04	80m	-24 / -	ES2AJ	- / -15	4	Partial capture
10-27 04:03	80m	- / -16	DL8TV	+10 / -	2	✓ Closing fragment
10-27 03:59	80m	- / -	DL8TV	+10 / -	4	Partial capture
10-27 03:55	80m	-23 / -18	OM5KM	+15 / -20	6	✓ Full exchange observed
10-27 03:55	80m	-23 / -	OH5BM	- / -17	3	Partial capture
10-27 03:53	80m	-20 / -11	DC8SM	-4 / -18	6	✓ Full exchange observed
10-27 03:50	80m	-19 / -14	OM2WQ	+10 / -10	6	✓ Full exchange observed
10-27 03:50	80m	-21 / -9	F4EGM	-3 / -14	3	✓ Full exchange observed
10-27 03:49	80m	- / -	DL9KM	-19 / -	3	Partial capture
10-27 03:49	80m	-18 / -5	IZ8VYU	-5 / -3	6	✓ Full exchange observed
10-27 03:43	80m	-18 / -16	RA2FCF	-7 / -18	4	✓ Full exchange observed
10-27 03:38	80m	-20 / -17	RA2FCF	-6 / -	4	Partial capture
10-24 03:57	80m	- / -	DO1FHQ	+1 / -	9	Partial capture
10-24 03:56	80m	- / -	DC5PPM	+8 / -	7	Partial capture
10-24 03:55	80m	- / -	F4EGM	+1 / -	3	Partial capture
09-09 23:59	40m	-22 / +1	G5STU	-1 / -	4	✓ Closing observed
09-09 23:54	80m	- / -14	EA1AUO	-8 / -	3	✓ Closing fragment
09-09 23:53	80m	- / -	DD6WF	+14 / -	2	Partial capture
08-28 00:54	40m	-5 / +2	EI9KF	-13 / -3	6	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
042030  +1 1733  K4FS OH5BM -25 (x2)
050215 -16 1731  LY5A K4FS -11
050330 -22 2629  K4FS HB9TKB JN36
050345 -13 1732  LY5A K4FS EM85
050645 -12 2082  K4FS E75W -15
050845  +5  750  K4FS LY1G -11 (x2)
051045  +0  939  K4FS OH1TSM KP11 (x2)
051130 -15 1653  K4FS GU4WRP -09 (x2)
230615  +8 2326  K4FS MD0CCE -14 (x3)

40m

UTC    dB Audio  Message
045400  -5 1165  K4FS UR9QQ KN77 (x4)
045630  -3 1665  K4FS Z34K KN01
045645 -20 1164  SV9AUP K4FS RR73
045700  -7 1665  K4FS Z34K KN01
045700 -14 1043  K4FS SV9AUP 73
045700  -3 1183  K4FS IZ8NON JN71
045715 -17 1164  Z34K K4FS -03
045730  -1 1664  K4FS Z34K KN01
045730  -1 1183  K4FS IZ8NON R-05
045800  +5 1164  K4FS Z34K R-01
045815 -14 1164  Z34K K4FS RR73
045830  +6 1165  K4FS Z34K 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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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