KJ4YLR — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM77

Receiver-side FT8 activity involving KJ4YLR, decoded by SO8OO in southeastern Poland. 12 FT8 messages attributed to this token as transmitter, on 40m, across 1 UTC dates in the available aggregate history. Last observed 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 12 FT8 messages attributed to KJ4YLR as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -13 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

40m · 12

First attributed message: 2026-09-07
Last attributed message: 2026-09-07 01:12 UTC

Observed FT8 message patterns

Attributed sample: 12 messages
Active dates: 1 UTC dates
Estimated median S/N: -13 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 9, strong (≥ -8 dB) 0.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with KJ4YLR in decoded directed-looking exchanges:

AB2RR · United States DL3MIB · Fed. Rep. of Germany DL3OCF · Fed. Rep. of Germany F4BYA · France F5HNQ · France HB9EFK · Switzerland IQ4JO · Italy IW0RLC · Italy K4NKU · United States KB3Z · United States KJ5IAI · United States RG5A · European Russia

Most frequent locator attributed to KJ4YLR

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: EM77 · 5 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,943 km (approx.)
Last such locator decoded: 2026-09-07 01:12 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	KJ4YLR S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-07 01:10	40m	- / -	F5PBG	+6 / -	3	Partial capture
09-07 01:09	40m	-16 / -	K4NKU	- / +7	2	✓ Closing fragment
09-07 01:07	40m	- / -21	DA1MHH	-3 / -	2	Partial capture
09-07 01:06	40m	-20 / -	AB2RR	- / -8	2	✓ Closing fragment
09-07 01:03	40m	-12 / +6	KB3Z	-6 / +3	6	✓ Full exchange observed
09-07 01:01	40m	-12 / -	KJ5IAI	- / -5	3	✓ Closing fragment
09-03 01:34	40m	- / -	F5PBG	-10 / -	3	Partial capture
09-03 01:30	40m	- / -	F5PBG	-17 / -	4	Partial capture
09-03 01:24	40m	- / -12	F4BYA	+4 / -	6	✓ Closing fragment
08-29 02:53	40m	- / -15	F4IFO	-6 / -	4	Partial capture
08-06 02:33	40m	- / -	F5PBG	-17 / -	3	Partial capture
08-06 02:31	40m	- / -16	RG5A	+1 / -	3	✓ Closing fragment
08-06 02:24	40m	- / -18	DL1USB	-3 / -	2	Partial capture
08-06 02:24	40m	- / -15	DL3MIB	-15 / -	11	✓ Closing fragment
08-06 02:12	40m	- / -	PA1PXL	-5 / -	3	Partial capture
08-06 01:43	40m	- / -	DL1UDO	-12 / -	4	Partial capture
08-06 01:42	40m	- / -	RV6C	-4 / -	4	Partial capture
08-06 01:37	40m	- / -	DL3MIB	-13 / -	6	Partial capture
08-06 01:33	40m	- / -	PD0IFI	-4 / -	3	Partial capture
08-06 01:19	40m	- / -	9A3AUH	-14 / -	4	Partial capture
08-02 18:04	10m	- / -19	PP2RR	-12 / -	4	Partial capture
08-02 00:42	40m	- / -	PD1BER	-14 / -	3	Partial capture
08-02 00:34	40m	- / -	DH5BM	-10 / -	8	Partial capture
08-02 00:34	40m	- / -	PD1BER	-16 / -	7	Partial capture
08-02 00:23	40m	- / -10	IW0RLC	-6 / -	4	✓ Closing fragment
08-02 00:23	40m	- / -	OO0O	-9 / -	2	Partial capture
08-02 00:08	40m	- / -16	OZ5GW	-20 / -	3	Partial capture
08-01 23:56	40m	- / -	DG9FEH	-23 / -	6	Partial capture
08-01 23:53	40m	- / -13	OZ5GW	-20 / -	2	Partial capture
08-01 23:49	40m	- / -	OZ5GW	-14 / -	2	Partial capture
07-14 02:12	40m	- / -	OH1EDK	-1 / -	2	Partial capture
07-14 01:50	40m	- / -	IK4LZH	-3 / -	3	Partial capture
07-14 01:33	40m	- / -	DL1UDO	-6 / -	4	Partial capture
07-14 01:17	40m	- / -24	IQ4JO	+7 / -	3	✓ Closing fragment
07-13 23:58	40m	- / -13	F5HNQ	-7 / -	3	✓ Closing fragment
07-13 23:57	40m	- / -	F1IQH	-17 / -	4	Partial capture
07-05 04:34	40m	- / -14	DL3OCF	-14 / -	2	✓ Closing fragment
07-05 04:34	40m	- / -	IK4DRY	-22 / -	4	Partial capture
07-04 01:45	40m	- / -21	<...>	-20 / -	2	Partial capture
06-26 01:23	40m	- / -8	HB9EFK	-5 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
010500  -6  922  KJ4YLR KB3Z +06
010515 -14  588  KB3Z KJ4YLR R+03
010530  -6  922  KJ4YLR KB3Z RR73
010645 -21  588  AB2RR KJ4YLR -08
010700  -6  264  KJ4YLR DA1MHH -21
010715 -18  588  AB2RR KJ4YLR RR73
010730  +0  264  KJ4YLR DA1MHH -21
010900  -7 2757  KJ4YLR UW5ESX KN67
010915 -19  588  K4NKU KJ4YLR +07 (x2)
011000  +6  639  KJ4YLR F5PBG IN78 (x2)
011100 -11 1473  KJ4YLR CT7AUT IM67
011130  +6  639  KJ4YLR F5PBG IN78
011245 -13  588  SN40KZE KJ4YLR EM77

20m

UTC    dB Audio  Message
000100  -6  324  KJ4YLR 4L7T -07
171000  -2 2046  KJ4YLR NF3R FN20

10m

UTC    dB Audio  Message
180430 -12  902  KJ4YLR PP2RR -19 (x4)

80m

UTC    dB Audio  Message
234800  +2 1249  KJ4YLR <...> -17

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