SI9YL — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JP82

Receiver-side FT8 activity involving SI9YL, decoded by SO8OO in southeastern Poland. 143 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-08-27.

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 143 FT8 messages attributed to SI9YL as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (85%), followed by 10 m (15%). Most decodes (88%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

143

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

20m · 122 10m · 21

First attributed message: 2026-06-07
Last attributed message: 2026-08-27 14:12 UTC

Observed FT8 message patterns

Attributed sample: 143 messages
Active dates: 7 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -20 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 46, moderate (-15 to -9 dB) 54, strong (≥ -8 dB) 43.

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 SI9YL in decoded directed-looking exchanges:

DJ0QO · Fed. Rep. of Germany DL8NW · Fed. Rep. of Germany DO9BAU · Fed. Rep. of Germany F4FTV · France IK2XYI · Italy ON7DE · Belgium ON7EH · Belgium OZ9WRH · Denmark PD0HLA · Netherlands PD1ROS · Netherlands BA3NZ · China BG7BVI · China

Most frequent locator attributed to SI9YL

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: JP82 · 76 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,427 km (approx.)
Last such locator decoded: 2026-08-27 14:12 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	SI9YL S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-27 14:01	20m	0 / -	RI1FJL	- / -16	24	Partial capture
08-27 13:42	20m	-7 / -	RI1FJL	- / -	17	Partial capture
08-20 15:56	20m	- / -10	PA1PXL	-7 / -	3	✓ Closing fragment
08-20 15:50	20m	- / -18	RN6MA	+8 / -	3	Partial capture
08-19 18:07	20m	- / -	F5PMF	+1 / -	3	Partial capture
08-15 19:21	20m	-16 / -	F4HTA	- / -	3	Partial capture
08-15 19:12	20m	-10 / -	XU7O	- / -15	2	Partial capture
08-15 19:10	20m	-10 / -	BG7BVI	- / -17	4	✓ Closing fragment
08-15 19:08	20m	-7 / -	BA3NZ	- / -5	3	✓ Closing fragment
08-15 19:07	20m	-10 / -	M0CAT	- / -7	2	Partial capture
08-15 19:06	20m	-10 / -	BG7BMG	- / -22	2	Partial capture
08-15 19:03	20m	-12 / -	BH2WTV	- / -	2	✓ Closing fragment
08-15 19:00	20m	-12 / -	<...>	- / -	2	Partial capture
08-11 18:59	40m	- / -	YO7ARZ	-14 / -	4	Partial capture
08-11 18:57	40m	- / -16	OZ/DG1ATN	-20 / -	2	Partial capture
08-11 18:54	40m	- / -12	SP7CKU	-11 / -	2	Partial capture
08-11 18:01	10m	- / +8	IK2XYI	-14 / -	2	✓ Closing fragment
08-09 09:59	20m	- / -	IU3GPT	-20 / -	3	Partial capture
08-09 09:56	20m	- / -10	PD3LKN	-12 / -	3	✓ Closing fragment
07-30 19:09	10m	- / -3	DJ0QO	-14 / -	3	✓ Closing fragment
07-30 18:59	10m	- / -6	PD1ROS	-18 / -	6	✓ Closing fragment
07-30 18:57	10m	- / -	DK6AH	-8 / -	2	Partial capture
07-30 18:54	10m	- / -	DL8NW	-10 / -	4	✓ Closing fragment
07-29 17:05	20m	- / -13	RZ4FWA	-13 / -	3	Partial capture
07-23 18:18	20m	- / +1	G3BAM	-6 / -	2	✓ Closing fragment
07-23 18:12	20m	- / -3	F4IIX	+2 / -	2	Partial capture
07-20 20:02	40m	- / -	SV5BYP	-18 / -	3	Partial capture
07-20 19:54	40m	- / -	SA3LEN	-3 / -	4	✓ Closing fragment
07-20 19:46	40m	- / -14	UT3UY	-9 / -	3	✓ Closing fragment
07-20 19:45	40m	- / -8	R4FDQ	-16 / -	2	✓ Closing fragment
07-20 19:43	40m	- / -	DK0RST	-16 / -	2	✓ Closing fragment
07-19 19:28	40m	- / -15	IQ4JO	-1 / -	3	✓ Closing fragment
07-15 18:49	20m	- / +1	RZ4FWA	-21 / -	3	Partial capture
07-13 20:39	20m	- / -13	TN8GD	-4 / -	2	✓ Closing fragment
06-26 17:09	10m	- / -	IK1RQX	-4 / -	2	Partial capture
06-26 17:08	10m	- / -4	UA9AX	0 / -	3	Partial capture
06-26 17:03	10m	- / -13	DO9BAU	-4 / -	3	✓ Closing fragment
06-26 16:48	10m	- / +4	ON7DE	-10 / -	2	✓ Closing fragment
06-26 16:46	10m	- / -13	DN9RP	-12 / -	11	Partial capture
06-26 12:36	10m	- / -	RN1CW	-16 / -	3	Partial capture
06-26 11:51	10m	- / +10	OZ9WRH	-15 / -	3	✓ Closing fragment
06-25 19:39	10m	- / -	DJ0MAB	-14 / -	4	Partial capture
06-25 19:28	10m	- / -3	F4FTV	+8 / -	2	✓ Closing fragment
06-25 19:17	10m	- / +1	PD0HLA	-4 / -	2	✓ Closing fragment
06-23 17:33	20m	- / -4	RU4SS	-7 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
140545  -1 1293  RI1FJL SI9YL JP82 (x15)

40m

UTC    dB Audio  Message
200045  -7 1734  SI9YL SN1A JO73
200215 -19 1800  SI9YL SV5BYP KM46 (x2)
200315 -10 1734  SI9YL SN1A JO73
200345 -17 1800  SI9YL SV5BYP KM46
175715 -18 1395  SI9YL R3LC KO64
183615 -22 1312  SI9YL SA3YTA JP82
185415 -12 1995  SI9YL SP7CKU -12 (x2)
185715 -21 1532  SI9YL OZ/DG1ATN -16 (x2)
185915 -10 1300  SI9YL YO7ARZ KN14 (x4)

10m

UTC    dB Audio  Message
185500  -9  838  SI9YL DL8NW R+21 (x2)
185730  -8 2090  SI9YL DK6AH JN48 (x2)
185900 -23 1335  SI9YL PD1ROS JO22 (x6)
190915 -19 1938  SI9YL DJ0QO -03 (x3)
180100 -14 1722  SI9YL IK2XYI +08 (x2)

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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