OK1SI — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Czech Republic Most frequent locator attributed to this token: JO70

Receiver-side FT8 activity involving OK1SI, decoded by SO8OO in southeastern Poland. 3,339 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 50 UTC dates in the available aggregate history. Observed between 2026-06-14 and 2026-10-10.

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 3,339 FT8 messages attributed to OK1SI as the transmitting token by decoded message structure across 50 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (86%), followed by 40 m (12%) and 20 m (2%). Most decodes (87%) fell within the six-hour window 19:00-01:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (96%); the estimated median was +12 dB.

Overview

3,339

Messages attributed

UTC dates decoded

221

Active 15-min windows

+12 dB

Estimated median S/N

Bands

80m · 2,873 40m · 386 20m · 80

First attributed message: 2026-06-14
Last attributed message: 2026-10-10 22:38 UTC

Observed FT8 message patterns

Attributed sample: 3,339 messages
Active dates: 50 UTC dates
Estimated median S/N: +12 dB
Estimated 10th-90th percentile: -3 to +20 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 28, moderate (-15 to -9 dB) 100, strong (≥ -8 dB) 3,211.

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 OK1SI in decoded directed-looking exchanges:

ON4MAP · Belgium ×6 F1PBZ · France ×3 TA3NK · Asiatic Turkey ×3 YU7AS · Serbia ×3 DO9POL · Fed. Rep. of Germany ×3 TA7ARH · Asiatic Turkey ×2 G8OO · England ×2 RI1FJL · Franz Josef Land ×2 SA4AGM · Sweden ×2 SX2LGT · Greece ×2 9K2HN · Kuwait ×2 DL4DP · 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 OK1SI

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: JO70 · 2,021 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 487 km (approx.)
Last such locator decoded: 2026-10-10 22:38 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	OK1SI S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-10 22:37	80m	-16 / -	HF40BLP	- / -	3	Partial capture
10-10 22:34	80m	-4 / -	SP5PKS	- / -1	3	✓ Closing fragment
10-10 22:32	80m	-1 / -3	DO6MFD	+1 / 0	5	✓ Full exchange observed
10-07 22:20	80m	+16 / -	ON4CJK	- / -	10	Partial capture
10-07 22:18	80m	+18 / -2	OH3CYT	0 / +4	5	✓ Full exchange observed
10-07 22:16	80m	+16 / -20	M7GOA	-20 / -16	3	✓ Full exchange observed
10-07 22:13	80m	+18 / -5	G0FYD	-16 / -7	5	✓ Full exchange observed
10-07 22:10	80m	+18 / -7	SP4WJ	-6 / -3	7	✓ Full exchange observed
10-07 22:10	80m	+17 / -	R8KAW/P	- / -	3	Partial capture
10-07 22:08	80m	+18 / +7	DL6LAY	-14 / -2	5	✓ Full exchange observed
10-07 22:05	80m	+16 / -	R2BPS	-13 / -15	5	✓ Closing observed
10-07 22:05	80m	+16 / -	I1WXY	- / -	2	Partial capture
10-07 22:03	80m	+21 / -	DL4DP	- / -8	2	✓ Closing fragment
10-07 21:59	80m	+23 / -14	II5GG	+4 / -17	7	✓ Full exchange observed
10-07 21:58	80m	+18 / -	DL5YAS	- / -	2	Partial capture
10-07 21:54	80m	+14 / -14	IQ8DO	-12 / -6	7	✓ Full exchange observed
10-07 21:50	80m	+17 / -	DF4WC	-3 / +3	5	✓ Full exchange observed
10-07 21:49	80m	+16 / -	SQ2RAD	-9 / 0	3	✓ Full exchange observed
10-07 21:47	80m	+18 / -18	ON3VZ	-14 / 0	5	Partial capture
10-07 21:46	80m	+14 / -	EA4DM	- / -	2	Partial capture
10-07 21:44	80m	+14 / -	ON7PR	-6 / 0	5	✓ Full exchange observed
10-07 21:43	80m	+20 / -	DF4WC	- / -	2	Partial capture
10-07 21:41	80m	+14 / +9	SP2ADI	+8 / -6	7	✓ Full exchange observed
10-07 21:39	80m	+14 / -2	IU3FVJ	-4 / -9	5	✓ Full exchange observed
10-07 21:35	80m	+14 / +2	SP6GCU	+22 / +1	4	Partial capture
10-07 21:34	80m	+14 / -	DL7PIA	+5 / +1	8	✓ Full exchange observed
10-07 21:33	80m	+20 / -7	M0EBM	-6 / -8	4	✓ Full exchange observed
10-07 21:31	80m	+18 / +2	SQ5ANT	-2 / -1	5	✓ Full exchange observed
10-07 21:29	80m	+20 / -8	G0BKC	-10 / -8	5	✓ Full exchange observed
10-07 21:27	80m	+15 / -	YT2FA	-10 / -4	4	✓ Closing observed
10-07 21:25	80m	+10 / -	DO9JTR	-2 / -5	4	✓ Full exchange observed
10-07 21:24	80m	+10 / -	SP4BB	- / -6	2	✓ Closing fragment
10-07 21:20	80m	+9 / -	ON1BH	- / -2	2	✓ Closing fragment
10-07 21:19	80m	+16 / -	PD3LR	- / -15	2	✓ Closing fragment
10-07 21:19	80m	+7 / -	OE9RWH	-6 / +1	5	Partial capture
10-07 21:16	80m	+15 / -	TM47CDXC	- / -17	3	✓ Closing fragment
10-07 21:15	80m	+16 / -	SP3HGD	-9 / 0	5	✓ Full exchange observed
10-07 21:12	80m	+15 / -14	E79KO	+6 / 0	6	✓ Full exchange observed
10-07 21:10	80m	+19 / -	OE1PHS	-8 / -3	15	Partial capture
10-07 21:08	80m	+19 / 0	S57BTI	+4 / -9	5	✓ Full exchange observed
10-07 21:08	80m	+21 / -20	UA4CKN	-13 / -5	4	✓ Full exchange observed
10-07 21:05	80m	+19 / -	GM4JKZ	- / -9	2	✓ Closing fragment
10-07 21:05	80m	+23 / -	OK2VCR	+1 / +2	6	✓ Full exchange observed
10-06 21:22	40m	- / +1	PH0RON	-8 / -	2	✓ Closing fragment
10-06 21:14	40m	-8 / -	JF4VZT	- / -	7	Partial capture
10-06 20:43	40m	-5 / -	PH9OY	- / -13	5	Partial capture
10-06 20:35	40m	- / -	DL9KM	-18 / -	3	Partial capture
10-06 20:32	40m	-8 / -	HB9FLH	- / -21	2	Partial capture
10-06 20:29	40m	+1 / -7	OE1PHS	-8 / -15	5	✓ Full exchange observed
10-06 20:26	40m	+5 / -2	G5NGL	-5 / -9	5	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
222300 +15  335  ON4CJK OK1SI JO70 (x4)
223245  -1  458  DO6MFD OK1SI JO70
223300  +2  457  OK1SI DO6MFD -03
223315  -2  458  DO6MFD OK1SI R+00
223330  +0  458  OK1SI DO6MFD RR73
223345  +0  458  DO6MFD OK1SI 73
223415  -6 2585  SP5PKS OK1SI R-01 (x3)
223700 -11 1892  HF40BLP OK1SI JO70 (x3)

40m

UTC    dB Audio  Message
204445 -10  329  PH9OY OK1SI -13 (x4)
211300  -9  329  CQ DX OK1SI JO70
211430  -3  329  JF4VZT OK1SI JO70 (x7)
212215  -5  329  OK1SI PH0RON R+01 (x2)
202230 -18 1732  OK1SI IZ8DFO +03

20m

UTC    dB Audio  Message
210200 +15  449  CQ OK1SI JO70
210315  +7  448  JK1PCP OK1SI JO70 (x2)
213500 -16 2459  OK1SI JF1UVJ PM95 (x4)
215915  -1 1755  OK1SI IR7MGGC +09
184830  +8  353  OK1SI TA2EE KM69 (x2)
184930 +12  352  OK1SI TA3NK KM39 (x3)
185200  -9 1068  OK1SI II7MGML +10
224915  -6 1373  OK1SI HB10GBT -07

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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