5B4ALJ — 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: Cyprus Most frequent locator attributed to this token: KM64

Receiver-side FT8 activity involving 5B4ALJ, decoded by SO8OO in southeastern Poland. 857 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 38 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-10-25.

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 857 FT8 messages attributed to 5B4ALJ as the transmitting token by decoded message structure across 38 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (42%), followed by 20 m (19%) and 80 m (16%). Most decodes (67%) fell within the six-hour window 23:00-05:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (64%); the estimated median was -4 dB.

Overview

857

Messages attributed

UTC dates decoded

113

Active 15-min windows

-4 dB

Estimated median S/N

Bands

80m · 140 60m · 127 40m · 361 20m · 163 10m · 66

First attributed message: 2026-06-08
Last attributed message: 2026-10-25 17:53 UTC

Observed FT8 message patterns

Attributed sample: 857 messages
Active dates: 38 UTC dates
Estimated median S/N: -4 dB
Estimated 10th-90th percentile: -14.7 to +5 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 61, moderate (-15 to -9 dB) 246, strong (≥ -8 dB) 550.

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 5B4ALJ in decoded directed-looking exchanges:

N4LR · United States ×3 F5MYK · France HJ4LGH · Colombia R6FMF · European Russia R7DX · European Russia KF9UG · United States RO6G · European Russia W0KNG · United States W7XE · United States 6Y5DH · Jamaica 9A3EYA · Croatia AD0IM · United States

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 5B4ALJ

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: KM64 · 425 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,944 km (approx.)
Last such locator decoded: 2026-10-25 17:53 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	5B4ALJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-25 17:50	60m	-14 / -	S9R	- / -	8	Partial capture
10-20 04:47	40m	+5 / -	YN1ZGN	- / -	4	Partial capture
10-20 04:46	40m	- / -	DL3HN	-8 / -	7	Partial capture
10-20 04:45	40m	+6 / +6	Z34K	+12 / -	5	✓ Closing observed
10-20 04:44	40m	-1 / -6	F4HSB	-15 / -12	4	✓ Full exchange observed
10-20 04:42	40m	0 / -	V31MA	- / -12	4	✓ Closing fragment
10-20 04:40	40m	0 / -	YN1ZGN	- / -	5	Partial capture
10-19 03:54	40m	+1 / -	RK3YWS/P	- / -9	14	Partial capture
10-19 03:36	40m	+1 / -	SQ1EG	- / -11	2	✓ Closing fragment
10-19 03:35	40m	+4 / +5	NF3R	-17 / -19	5	✓ Full exchange observed
10-19 03:32	40m	-1 / -	6Y5DH	- / -15	5	✓ Closing fragment
10-18 19:12	40m	-7 / -	H49A	- / -18	10	Partial capture
10-18 19:06	40m	-11 / -	H49A	- / -	6	Partial capture
10-18 18:55	40m	-6 / -	H49A	- / -	2	Partial capture
09-05 17:56	60m	0 / -	D2ACE	- / -7	3	✓ Closing fragment
09-03 03:54	40m	- / -	ON8EM	-6 / -	4	Partial capture
09-03 03:53	40m	-6 / -	D44TWO	- / -	9	Partial capture
09-03 03:11	40m	- / -	OH4JFN	-4 / -	2	Partial capture
09-03 03:10	40m	-3 / -	HK0RMR	- / -	11	Partial capture
09-03 03:10	40m	- / -	ON8EM	0 / -	4	Partial capture
09-03 03:07	60m	- / +2	I/DH3YAK	-16 / -	3	✓ Closing fragment
09-03 03:07	60m	- / -	OH3GBW	-11 / -	6	Partial capture
09-03 03:06	60m	+2 / -	VE3OU	- / -14	3	✓ Closing fragment
09-03 03:04	60m	+7 / -	D44TWO	- / -17	3	✓ Closing fragment
09-03 03:04	40m	0 / -	HK0RMR	- / -	7	Partial capture
09-01 18:57	40m	- / -	F6FHZ	-15 / -	3	Partial capture
09-01 18:56	40m	+2 / -	R2BQM	-7 / -	2	✓ Closing observed
09-01 18:52	40m	- / -	F5PBG	0 / -	4	Partial capture
09-01 18:50	40m	- / +3	R2BQM	-1 / -	5	Partial capture
09-01 18:49	40m	- / -23	9A3EYA	-4 / -	6	✓ Closing fragment
08-31 18:39	20m	+6 / -	KF9UG	- / -7	4	✓ Closing fragment
08-31 18:34	20m	+2 / -	K8IJ	- / -	3	Partial capture
08-31 18:15	40m	0 / -	RI1FJL	- / -26	7	✓ Closing fragment
08-31 18:12	40m	- / -	DL2VAH	+8 / -	6	Partial capture
08-31 04:53	20m	+8 / -	NC3S	- / -	3	Partial capture
08-23 05:40	20m	- / -9	G5MJF	-11 / -	2	Partial capture
08-23 05:37	20m	+11 / -	W7XE	- / -20	3	✓ Closing fragment
08-23 05:22	20m	+16 / -	WB3JUV	- / -	4	Partial capture
08-23 04:29	20m	+12 / -	RO6G	- / -10	4	✓ Closing fragment
08-23 04:26	20m	+13 / -	W0KNG	- / -15	2	✓ Closing fragment
08-23 04:22	20m	+13 / -	N0VTY	- / -23	2	Partial capture
08-23 04:21	20m	+8 / -	W0KNG	- / -	2	Partial capture
08-16 19:02	60m	- / -	IK4CBO	-10 / -	2	Partial capture
08-16 19:00	60m	-2 / -	9J2FI	- / -6	4	✓ Closing fragment
08-12 08:58	10m	- / -	F4WDL	-11 / -	7	Partial capture
08-12 08:44	10m	- / -	F4WDL	-4 / -	2	Partial capture
08-12 08:44	10m	- / -26	R7DX	-10 / -	5	✓ Closing fragment
08-12 01:38	40m	-10 / -	WB9VGJ	- / -	5	Partial capture
08-12 01:38	80m	+1 / -	W1NB	- / -	3	Partial capture
08-12 01:33	60m	-4 / -	N4LR	- / -12	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
030845 -14 1439  <5B4ALJ> I/DH3YAK 73
030915  -7 1956  5B4ALJ OH3GBW KP21 (x3)
175630  +3  963  D2ACE 5B4ALJ KM64 (x3)
175015  -8 1451  S9R 5B4ALJ KM64 (x8)

40m

UTC    dB Audio  Message
044545 -16 1576  5B4ALJ F4HSB 73
044615 +12  735  5B4ALJ Z34K R+06
044615 -11 1789  5B4ALJ DL3HN JN49
044630  +6  736  Z34K 5B4ALJ RR73
044645  +9  735  5B4ALJ Z34K 73
044645 -11 1789  5B4ALJ DL3HN JN49
044700  +6  736  YN1ZGN 5B4ALJ KM64
044715  -7 1789  5B4ALJ DL3HN JN49
044730  +7  736  YN1ZGN 5B4ALJ KM64
044745 -12 1789  5B4ALJ DL3HN JN49
044800  +4  736  YN1ZGN 5B4ALJ KM64
044815  -9 1789  5B4ALJ DL3HN JN49
044830  +2  736  YN1ZGN 5B4ALJ KM64
044915  -5  809  5B4ALJ DL3HN JN49 (x2)

20m

UTC    dB Audio  Message
053730 +16  796  W7XE 5B4ALJ KM64 (x3)
054015 -12 2079  5B4ALJ G5MJF -09 (x2)
045315  +6 1683  NC3S 5B4ALJ KM64 (x3)
183445  +2 1682  K8IJ 5B4ALJ KM64 (x3)
183900 +11 1682  KF9UG 5B4ALJ KM64 (x4)

10m

UTC    dB Audio  Message
083400 -13  990  5B4ALJ R6FMF 73
084400 -11 1522  5B4ALJ R7DX KN84
084400  -3  874  5B4ALJ F4WDL IN94
084430  -7 1522  5B4ALJ R7DX KN84
084430  -6  874  5B4ALJ F4WDL IN94
084600  -8 1522  5B4ALJ R7DX R-26 (x3)
085800  -4  874  5B4ALJ F4WDL IN94 (x7)

80m

UTC    dB Audio  Message
012830  +4 1765  W1MLT 5B4ALJ 73
012945  +6  900  5B4ALJ RA4FP -11
013030  +0 1765  RA4FP 5B4ALJ R-01 (x2)
013145  +7  900  5B4ALJ RA4FP RR73
013200  -7 1786  RA4FP 5B4ALJ 73
013215  +3 1787  5B4ALJ DK1MCS JN57 (x6)
013815  +1 1786  W1NB 5B4ALJ KM64 (x3)

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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