KJ4YLR — 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: EM77

Receiver-side FT8 activity involving KJ4YLR, decoded by SO8OO in southeastern Poland. 14 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-07 and 2026-10-24.

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 14 FT8 messages attributed to KJ4YLR as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (86%), followed by 80 m (14%). 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

80m · 2 40m · 12

First attributed message: 2026-09-07
Last attributed message: 2026-10-24 05:00 UTC

Observed FT8 message patterns

Attributed sample: 14 messages
Active dates: 2 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) 5, 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 EA3NE · Spain F4BYA · France K4NKU · United States KB3Z · United States KJ5IAI · United States G0BLB · England

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
11-02 02:33	40m	- / -15	EA3NE	-9 / -	4	✓ Closing fragment
11-02 02:21	40m	- / -19	EA3NE	-4 / -	2	Partial capture
11-02 02:21	40m	- / -	EA5FD	-15 / -	5	Partial capture
11-02 02:20	40m	- / -	EA5HM	-7 / -	9	Partial capture
11-02 02:15	40m	- / -	LZ2PAJ	-10 / -	2	Partial capture
11-02 02:10	40m	- / -14	F1PBZ	-10 / -	2	Partial capture
11-02 01:48	40m	- / -	MI7XHT	-14 / -	3	Partial capture
11-02 01:43	40m	- / -	MI7XHT	-17 / -	2	Partial capture
11-02 01:38	40m	- / -15	PE40EUDXF	+11 / -	3	Partial capture
10-29 23:23	40m	- / -	F5PBG	-5 / -	4	Partial capture
10-29 15:21	10m	- / -11	CR7BUW	-22 / -	2	Partial capture
10-29 02:59	40m	- / -15	F8MRQ	+3 / -	6	Partial capture
10-24 04:59	80m	-23 / -20	G0BLB	+4 / -7	5	✓ Full exchange observed
10-19 02:38	40m	- / -	CT2HEX	-14 / -	2	Partial capture
10-19 02:29	40m	- / -	IW0HAC	-4 / -	3	Partial capture
10-19 02:26	40m	- / -	ON8WR	0 / -	3	Partial capture
10-19 01:57	40m	- / -	DG4SCG	-19 / -	5	Partial capture
10-19 01:33	40m	- / +3	F1PBZ	+6 / -	4	Partial capture
10-19 01:33	40m	- / -22	S55DX	-7 / -	5	Partial 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

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
022145  -6 1200  KJ4YLR EA3NE -19
022215  -5  974  KJ4YLR EA5HM IM99
022215 -13 1406  KJ4YLR EA5FD IM99
022215  -3 1200  KJ4YLR EA3NE -19
022245  -8  974  KJ4YLR EA5HM IM99
022245 -16 1406  KJ4YLR EA5FD IM99
022315 -14  973  KJ4YLR EA5HM IM99
022315 -16 1406  KJ4YLR EA5FD IM99
022345  -4  973  KJ4YLR EA5HM IM99
022345 -16 1406  KJ4YLR EA5FD IM99
022415 -10  973  KJ4YLR EA5HM IM99
023315  -7 1200  KJ4YLR EA3NE -15 (x4)

10m

UTC    dB Audio  Message
151715 -16 1186  KJ4YLR EA7Z IM67
152145 -20 1593  KJ4YLR CR7BUW IM58 (x2)

80m

UTC    dB Audio  Message
045915  +6 1994  KJ4YLR G0BLB -20
045930 -23  479  G0BLB KJ4YLR R-07
045945  +0 1994  KJ4YLR G0BLB -20
050000 -23  479  G0BLB KJ4YLR R-07
050015  +5 1994  KJ4YLR G0BLB RR73

20m

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

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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