S57BTI — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Slovenia Most frequent locator attributed to this token: JN75

Receiver-side FT8 activity involving S57BTI, decoded by SO8OO in southeastern Poland. 957 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 35 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-19.

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 957 FT8 messages attributed to S57BTI as the transmitting token by decoded message structure across 35 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (58%), followed by 20 m (30%) and 60 m (6%). Most decodes (62%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (81%); the estimated median was 0 dB.

Overview

957

Messages attributed

UTC dates decoded

158

Active 15-min windows

0 dB

Estimated median S/N

Bands

80m · 45 60m · 57 40m · 558 20m · 291 10m · 6

First attributed message: 2026-06-07
Last attributed message: 2026-09-19 22:22 UTC

Observed FT8 message patterns

Attributed sample: 957 messages
Active dates: 35 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -11.8 to +12 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 23, moderate (-15 to -9 dB) 159, strong (≥ -8 dB) 775.

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 S57BTI in decoded directed-looking exchanges:

PD1DRE · Netherlands ×2 RW1CW · European Russia ×2 DL3BH · Fed. Rep. of Germany ×2 PG9S · Netherlands SP9OJ · Poland TM2WWA · France 2E0FHM · England AA2T · United States CN2DX · Morocco CR7BUJ · Portugal CT1BFP · Portugal CT3MD · Madeira Islands

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 S57BTI

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: JN75 · 585 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 708 km (approx.)
Last such locator decoded: 2026-09-19 22:21 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	S57BTI S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 22:21	60m	+1 / +10	DL5ASK	0 / -3	5	✓ Full exchange observed
09-19 22:15	60m	-6 / +2	F1PBZ	+3 / -1	5	✓ Full exchange observed
09-19 21:53	60m	0 / -7	J48S	+8 / -8	4	✓ Full exchange observed
09-19 21:51	60m	-2 / -	YT5DEY	- / -	3	Partial capture
09-19 21:49	60m	-2 / -	J48S	- / -	2	Partial capture
09-19 21:46	60m	- / -22	G4FHL	-6 / -	3	✓ Closing fragment
09-19 21:28	80m	- / -15	DO9POL	-8 / -	9	Partial capture
09-19 21:14	80m	+2 / -2	F5OYC	-9 / 0	5	✓ Full exchange observed
09-19 21:12	80m	+3 / -12	IU1VQG	-11 / -1	5	✓ Full exchange observed
09-19 21:11	80m	+4 / -	RW1CW	-4 / -8	5	✓ Closing observed
09-19 21:08	80m	+5 / -	RA0AF	- / -	2	Partial capture
09-19 21:05	80m	+1 / -2	9A3EYA	+12 / +1	5	✓ Full exchange observed
09-19 21:03	80m	+2 / +2	9A3QO	+1 / 0	6	✓ Full exchange observed
09-19 20:58	80m	-3 / -	M9OOS	-3 / -2	4	Partial capture
09-19 20:57	80m	-2 / -	IZ8KVW	- / -6	2	✓ Closing fragment
09-19 20:55	80m	-2 / -	R4HHN	- / -	2	Partial capture
09-19 20:49	80m	0 / -10	SQ2HEB	+8 / -13	6	✓ Full exchange observed
09-19 20:47	80m	-5 / -	RK0SC	- / -	2	Partial capture
09-19 20:44	80m	-6 / -	R3RRC/P	- / -	2	Partial capture
09-19 20:27	80m	+1 / -8	9A9N	0 / +3	5	✓ Full exchange observed
09-19 20:13	80m	- / -3	DK3ASE	+12 / -	2	✓ Closing fragment
09-19 20:07	80m	+12 / -12	DO1BJF	-16 / -12	3	Partial capture
09-18 19:53	40m	+16 / -	SQ3SWJ	- / -2	3	✓ Closing fragment
09-18 19:15	40m	+10 / -	RI1FJZ	- / -17	6	Partial capture
09-18 19:12	40m	+14 / -	UB8AHK	- / -	3	Partial capture
09-18 19:06	40m	+10 / -	3Z100PKP	- / 0	2	Partial capture
09-18 19:04	40m	+12 / -	G3EFG	- / -18	3	✓ Closing fragment
09-18 19:03	40m	+16 / -	JS2TFX	- / -	2	Partial capture
09-18 18:57	40m	+10 / -	DH0GBC	- / -	2	Partial capture
09-18 18:55	40m	+7 / -8	ON1DGN	-14 / -12	5	✓ Full exchange observed
09-18 18:26	40m	+8 / -	EU6UE	- / -16	3	✓ Closing fragment
09-18 18:10	40m	+9 / -	RI1FJZ	- / -	4	Partial capture
09-18 14:18	40m	+6 / -	PD1RGW	- / -17	2	Partial capture
09-18 14:16	40m	+16 / -	UG4L	- / -	2	Partial capture
09-18 14:14	40m	+11 / -	SQ100PKP	- / -	2	Partial capture
09-18 14:05	40m	+10 / -	F4FSY	- / -9	2	✓ Closing fragment
09-18 14:03	40m	+8 / -	SQ100PKP	- / -9	2	Partial capture
09-18 14:01	40m	+12 / -	UA1ZQN	- / -	2	Partial capture
09-18 13:58	40m	+14 / -	DG7EAO	- / -	2	Partial capture
09-18 13:55	40m	+14 / -	SP9TEX	+4 / 0	6	✓ Full exchange observed
09-18 13:54	40m	+10 / -	OK3MB	- / -1	2	✓ Closing fragment
09-18 13:53	40m	+12 / -	W1AW/1	- / +1	2	Partial capture
09-12 21:23	40m	+5 / -	OH5KNL	- / -15	3	✓ Closing fragment
09-12 21:21	40m	+6 / -	F4MCJ	- / -	2	Partial capture
09-12 21:19	40m	+2 / -	JA2IQV	- / -	2	Partial capture
09-12 21:10	40m	+11 / -	JA9CWJ	- / -	3	Partial capture
09-12 21:09	40m	+15 / -	LB5AK	- / -4	3	✓ Closing fragment
09-12 21:04	40m	+5 / -	JF0CSK	- / -15	2	✓ Closing fragment
09-12 21:02	40m	+8 / -8	SM0JSG	-12 / -1	7	✓ Full exchange observed
09-12 20:57	40m	+9 / -	SV1SSL	-6 / -11	4	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
215300  +7  583  S57BTI J48S -07
215315  +0 2797  J48S S57BTI R-08
215330 +10  584  S57BTI J48S RR73
215345  +1 2797  J48S S57BTI 73
221530  -9 2797  F1PBZ S57BTI JN75
221545  +5 2737  S57BTI F1PBZ +02
221600  -2 2797  F1PBZ S57BTI R-01
221615  +1 2737  S57BTI F1PBZ RR73
221630  -7 2798  F1PBZ S57BTI 73
221830  -4 2797  DG0JK S57BTI JN75
222100  -1 2797  DL5ASK S57BTI JN75
222115  +0  811  S57BTI DL5ASK +10
222130  -1 2797  DL5ASK S57BTI R-03
222145  -1  811  S57BTI DL5ASK RR73
222200  +4 2797  DL5ASK S57BTI 73

80m

UTC    dB Audio  Message
211400  +3 2767  F5OYC S57BTI JN75
211415 -12 2450  S57BTI F5OYC -02
211430  +5 2767  F5OYC S57BTI R+00
211445  -6 2450  S57BTI F5OYC RR73
211500  -1 2767  F5OYC S57BTI 73
211600  +1 2766  DO9POL S57BTI JN75
212815 -11  805  S57BTI DO9POL -15 (x9)

40m

UTC    dB Audio  Message
191645 +15 2780  RI1FJZ S57BTI JN75 (x5)
192100 +14 2794  OM2WW S57BTI JN75
192545 +14 2793  IT9KXK S57BTI 73
192615 +12 2793  I1YGQ S57BTI JN75
194130 +16 2793  T77R S57BTI JN75
195015 +16 2793  SQ6JFJ S57BTI JN75
195200  +9 2793  S57MPU S57BTI JN75
195330 +12 2793  SQ3SWJ S57BTI JN75 (x3)
223130 -22 1940  S57BTI K4JKB RR73

20m

UTC    dB Audio  Message
125845  +1 2776  S57BTI M0SSV RR73
132545  -4  866  S57BTI F4NKF 73
133130  -8  335  S57BTI EX7DY -20 (x2)
140345 -15 2166  S57BTI UT2UCI RR73
150130  -6  823  S57BTI MW7MCX -14
153145  +4  497  S57BTI YO3GNU -15 (x2)
200630  +9 1026  S57BTI YT7TZ +01 (x2)
201615 -13  866  UA4FQO S57BTI R-12
202400 -13 1161  K4YT S57BTI JN75 (x2)
202700 -13 1161  K1VVM S57BTI RR73
203030  -8 1160  WV5A S57BTI JN75

10m

UTC    dB Audio  Message
114145 -24 1745  S57BTI ON7EH JO20 (x2)
124115 -11 2349  S57BTI LZ1SGS -06 (x2)
122745  +0 2680  S57BTI TM2WWA -16 (x2)
170245  -4 2580  S57BTI PG9S JO32 (x3)
095115  -7  399  <...> S57BTI JN75 (x2)
095300 -10  400  SP9OJ S57BTI JN75 (x2)
132045 -10  610  E75W S57BTI JN75
132145  -8  610  ER3CT S57BTI JN75

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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