YL4U — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Latvia Most frequent locator attributed to this token: KO06

Receiver-side FT8 activity involving YL4U, decoded by SO8OO in southeastern Poland. 550 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-08-29 and 2026-08-30.

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 550 FT8 messages attributed to YL4U as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (54%), followed by 160 m (43%) and 40 m (3%). In this small sample, the estimated median decoder S/N was +6 dB; no usual signal pattern is inferred.

Overview

550

Messages attributed

UTC dates decoded

Active 15-min windows

+6 dB

Estimated median S/N

Bands

160m · 239 80m · 297 40m · 14

First attributed message: 2026-08-29
Last attributed message: 2026-08-30 03:37 UTC

Observed FT8 message patterns

Attributed sample: 550 messages
Active dates: 2 UTC dates
Estimated median S/N: +6 dB
Estimated 10th-90th percentile: -4 to +14 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 13, moderate (-15 to -9 dB) 10, strong (≥ -8 dB) 527.

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 YL4U in decoded directed-looking exchanges:

9A4ZM · Croatia ×2 DL9KM · Fed. Rep. of Germany ×2 EA3ZD · Spain ×2 F5RRS · France ×2 G8OO · England ×2 RA3WY · European Russia ×2 SP1ZMO · Poland ×2 SV1EKI · Greece ×2 UA3GX · European Russia ×2 US2YW · Ukraine ×2 PE1NPS · Netherlands ×2 DO5HB · Fed. Rep. of Germany ×2

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 YL4U

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: KO06 · 230 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 732 km (approx.)
Last such locator decoded: 2026-08-30 03:37 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	YL4U S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-30 10:21	10m	- / -	IZ2CPP	-8 / -	3	✓ Closing fragment
08-30 04:50	20m	- / -1	UA4FEN	+6 / -	2	✓ Closing fragment
08-30 04:46	20m	- / 0	RM8W	-19 / -	2	Partial capture
08-30 04:25	20m	- / +3	R9FDE	0 / -	3	✓ Closing fragment
08-30 04:21	20m	- / -9	RO6G	-6 / -	3	✓ Closing fragment
08-30 04:20	20m	- / -12	RZ4AZ	-15 / -	2	✓ Closing fragment
08-30 04:08	20m	- / -	UA9ZCC	-18 / -	2	✓ Closing fragment
08-30 04:02	20m	- / -12	RK4H	-2 / -	3	✓ Closing fragment
08-30 03:37	40m	- / +2	RT4A	-11 / -	2	✓ Closing fragment
08-30 03:36	80m	-4 / -	HI8R	- / -	3	Partial capture
08-30 03:36	80m	- / -	DO/PD1WD	+2 / -	4	Partial capture
08-30 03:36	40m	- / -13	RO6OP	0 / -	2	✓ Closing fragment
08-30 03:34	80m	-3 / -	M0LOW	- / -24	3	✓ Closing fragment
08-30 03:33	40m	- / -21	RZ4FWA	-22 / -	3	Partial capture
08-30 03:33	80m	-2 / -10	SP1ZMO	+3 / 0	4	✓ Full exchange observed
08-30 03:32	80m	-17 / -	OE5DML	+4 / -	2	✓ Closing observed
08-30 03:29	80m	+2 / -	F5PRH	- / -	2	Partial capture
08-30 03:28	40m	- / -1	YO4GIY	-16 / -	2	✓ Closing fragment
08-30 03:27	40m	- / -	PT7BR	-13 / -	3	Partial capture
08-30 03:25	80m	+1 / -7	MI0OBC	-9 / -5	7	✓ Full exchange observed
08-30 03:25	80m	0 / -	SP3HIF	- / -20	3	✓ Closing fragment
08-30 03:22	40m	- / -	R5DT	+4 / -	2	✓ Closing fragment
08-30 03:21	80m	0 / -	KF4JHG	- / -19	3	✓ Closing fragment
08-30 03:21	80m	-3 / -	RQ6B	-5 / -8	6	Partial capture
08-30 03:19	80m	+4 / +10	DO1ID	+6 / +9	2	Partial capture
08-30 03:18	80m	0 / -7	IK5CHL	+6 / -3	6	✓ Full exchange observed
08-30 03:17	160m	+8 / -5	SP3IOE	-8 / -	5	✓ Full exchange observed
08-30 03:15	160m	+2 / +1	G7RAU	-3 / +2	6	✓ Full exchange observed
08-30 03:14	160m	+5 / -	LX7I	+8 / -	5	✓ Full exchange observed
08-30 03:12	160m	+2 / -	SM3LBN	-7 / -	5	✓ Full exchange observed
08-30 03:05	160m	+2 / -	M7VIC	- / -13	2	✓ Closing fragment
08-30 03:04	160m	+4 / -	K1SFA	- / -	2	Partial capture
08-30 02:59	160m	+5 / -	K1SFA	- / -	3	Partial capture
08-30 02:57	160m	+4 / -7	F5RRS	-16 / -10	5	✓ Full exchange observed
08-30 02:55	160m	+9 / -	GM0OPS	0 / -	5	✓ Closing observed
08-30 02:53	160m	+7 / -	EA1FAW	- / -13	2	✓ Closing fragment
08-30 02:52	160m	+3 / -3	EA3EDU	-15 / -1	5	✓ Full exchange observed
08-30 02:51	160m	+10 / +5	PC1JB	-2 / +3	5	✓ Full exchange observed
08-30 02:46	160m	+10 / -	R1BED	- / -15	2	✓ Closing fragment
08-30 02:43	160m	+10 / -	OH3EVO	- / +2	2	✓ Closing fragment
08-30 02:43	160m	+10 / +4	DL9KM	-13 / 0	7	✓ Full exchange observed
08-30 02:42	80m	- / -	IK5CHL	-3 / -	2	Partial capture
08-30 02:41	160m	+12 / -4	F4PCM	-13 / -11	5	✓ Full exchange observed
08-30 02:38	160m	+8 / -	PY9MP	- / -	2	Partial capture
08-30 02:38	80m	+12 / -	ON1JP	- / -17	4	✓ Closing fragment
08-30 02:37	160m	+6 / -2	RA3WY	-4 / +8	6	✓ Full exchange observed
08-30 02:36	160m	+8 / -12	R7DX	+10 / -	5	✓ Full exchange observed
08-30 02:36	80m	+15 / -7	YO8XFU	+6 / -2	5	✓ Full exchange observed
08-30 02:34	160m	+7 / -1	DK3HV	-4 / +6	5	✓ Full exchange observed
08-30 02:33	80m	+9 / -	EA5HM	- / -9	4	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

10m

UTC    dB Audio  Message
102130  -8 1415  YL4U IZ2CPP JN45 (x3)
103245 -24 1656  YL4U DO1SHK JO31
103745 -24 2018  YL4U ON3BEN -18

20m

UTC    dB Audio  Message
040800 -17 2034  YL4U UA9ZCC NO21 (x2)
042045 -17 1802  YL4U RZ4AZ R-12 (x2)
042115  -6 2090  YL4U RO6G -09 (x3)
042530  +0  835  YL4U R9FDE LO88 (x3)
042930 -14 1027  YL4U UA9OBN NO15
044600 -21 2366  YL4U RM8W LO75 (x2)
045030  +6 1801  YL4U UA4FEN -01 (x2)

40m

UTC    dB Audio  Message
032215  +2 1451  YL4U R5DT +18 (x2)
032715 -15 1134  YL4U PT7BR HI06 (x2)
032815 -17 1391  YL4U YO4GIY -01 (x2)
032945 -10 1134  YL4U PT7BR HI06
033345 -21 2043  YL4U RZ4FWA R-21 (x3)
033600  +2 1097  YL4U RO6OP -13 (x2)
033730 -10 2063  YL4U RT4A +02 (x2)
034215  -7 1978  YL4U R2ZCA RR73

80m

UTC    dB Audio  Message
033230  -1 1409  CQ YL4U KO06
033300  -2 1409  SP1ZMO YL4U KO06
033315  +2 1410  YL4U SP1ZMO -10
033330  -2 1409  SP1ZMO YL4U R+00
033345  +4 1410  YL4U SP1ZMO RR73
033430  -2 1409  M0LOW YL4U KO06 (x3)
033615  +6  701  YL4U DO/PD1WD +13
033630  -5 1409  HI8R YL4U KO06 (x2)
033715  +0  701  YL4U DO/PD1WD +13
033730  -5 1409  HI8R YL4U KO06
033745  +0  701  YL4U DO/PD1WD +13 (x2)

160m

UTC    dB Audio  Message
031530  +2 1159  G7RAU YL4U KO06 (x2)
031615  -5 1158  YL4U G7RAU +01
031630  +5 1158  G7RAU YL4U R+02
031645  -1 1158  YL4U G7RAU RR73
031700  +3 1159  G7RAU YL4U 73
031730  +8  753  CQ YL4U KO06
031745  -8  986  YL4U SP3IOE JO72
031800  +7  753  SP3IOE YL4U +16
031815  -5  986  YL4U SP3IOE R-05
031830  +9  753  SP3IOE YL4U RR73
031845 -11  987  YL4U SP3IOE 73
031900  +7  753  CQ YL4U KO06 (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.

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