KR4FK — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM85

Receiver-side FT8 activity involving KR4FK, decoded by SO8OO in southeastern Poland. 59 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-06 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 59 FT8 messages attributed to KR4FK as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (46%), followed by 40 m (29%) and 80 m (25%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -17 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-17 dB

Estimated median S/N

Bands

80m · 15 40m · 17 20m · 27

First attributed message: 2026-06-06
Last attributed message: 2026-09-15 01:10 UTC

Observed FT8 message patterns

Attributed sample: 59 messages
Active dates: 8 UTC dates
Estimated median S/N: -17 dB
Estimated 10th-90th percentile: -20 to -10 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 35, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 1.

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 KR4FK in decoded directed-looking exchanges:

DL3MIB · Fed. Rep. of Germany ES2AJ · Estonia K2F · United States 9A2AJ · Croatia HB9CXZ · Switzerland J88IH · St. Vincent

Most frequent locator attributed to KR4FK

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 · 39 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,995 km (approx.)
Last such locator decoded: 2026-09-15 01:09 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	KR4FK S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 01:11	40m	- / -10	MI7XHT	-10 / -	2	Partial capture
09-15 01:09	40m	-11 / -	W6R	- / -3	2	Partial capture
08-29 16:08	20m	- / -11	DK9NP	+2 / -	2	Partial capture
08-29 16:01	20m	- / -5	DL3MIB	-18 / -	2	✓ Closing fragment
08-15 01:31	20m	- / -15	9K2OW	-5 / -	2	Partial capture
08-11 02:02	80m	- / -	DO1ID	-1 / -	4	Partial capture
08-11 01:48	80m	- / -	DO1ID	+4 / -	2	Partial capture
08-11 01:46	80m	-15 / -	<...>	- / -	3	Partial capture
08-10 22:13	20m	- / -	WV2B	-10 / -	2	Partial capture
08-06 02:43	80m	- / -	CT7AUT	-19 / -	3	Partial capture
08-06 02:42	80m	- / -	5B4ALJ	-2 / -	2	Partial capture
08-06 02:40	80m	- / +1	HB9CXZ	+1 / -	5	✓ Closing fragment
07-28 08:24	20m	- / -	DL9IQ	-3 / -	2	Partial capture
07-28 08:15	20m	- / -19	IZ8EYN	-8 / -	5	Partial capture
07-09 01:28	80m	- / -	DO1ID	0 / -	3	Partial capture
07-09 01:28	80m	- / -7	SQ9DJQ	+6 / -	6	Partial capture
07-09 01:27	80m	-13 / -	J88IH	- / -18	2	✓ Closing fragment
07-09 01:24	80m	-18 / -	R98PGJ	- / -	2	Partial capture
07-09 01:18	80m	- / -10	9A2AJ	+17 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
011530  -4 2228  KR4FK YO6LM -14
010645 -13  583  W6R KR4FK EM85 (x3)
011130  -6 2299  KR4FK MI7XHT IO64 (x2)

20m

UTC    dB Audio  Message
082315 -10  663  KR4FK MW7IHR IO73
082415  -3  313  KR4FK DL9IQ JO40 (x2)
082445 -15  983  KR4FK DL1YS JO40
202700 -15 1580  KR4FK IU8WQA JN70
221315 -11  517  KR4FK WV2B FM05 (x2)
013100  -4 2464  KR4FK 9K2OW -15 (x2)
154745 -10  767  KR4FK EA4HOT IM78
160115 -14 1679  KR4FK DL3MIB R-05 (x2)
160815  +1  800  KR4FK DK9NP -11 (x2)
161515 -24 1845  KR4FK ES2AJ RR73

80m

UTC    dB Audio  Message
024245  -2  814  KR4FK 5B4ALJ KM64
024345 -18 1443  KR4FK CT7AUT IM67 (x3)
014645 -15  599  <...> KR4FK EM85 (x3)
014830  +5  382  KR4FK DO1ID JO41 (x2)
015215 -20  599  <...> KR4FK EM85 (x2)
020230  -1  382  KR4FK DO1ID JO41 (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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