S57TW — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving S57TW, decoded by SO8OO in southeastern Poland. 6,425 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 15 UTC dates in the available aggregate history. Observed between 2026-08-25 and 2026-09-21.

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 6,425 FT8 messages attributed to S57TW as the transmitting token by decoded message structure across 15 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (46%), followed by 40 m (35%) and 60 m (9%). The busiest six-hour window was 21:00-03:00 UTC, containing 45% of decodes. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (97%); the estimated median was +9.1 dB.

Overview

6,425

Messages attributed

UTC dates decoded

258

Active 15-min windows

+9.1 dB

Estimated median S/N

Bands

160m · 180 80m · 2,932 60m · 596 40m · 2,237 20m · 480

First attributed message: 2026-08-25
Last attributed message: 2026-09-21 05:40 UTC

Observed FT8 message patterns

Attributed sample: 6,425 messages
Active dates: 15 UTC dates
Estimated median S/N: +9.1 dB
Estimated 10th-90th percentile: -3.2 to +17 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 35, moderate (-15 to -9 dB) 179, strong (≥ -8 dB) 6,211.

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 S57TW in decoded directed-looking exchanges:

ON4MAP · Belgium ×6 DL9KM · Fed. Rep. of Germany ×3 F1PBZ · France ×3 DA1ST · Fed. Rep. of Germany ×3 UR4LG · Ukraine ×3 DG7NT · Fed. Rep. of Germany ×2 JA5XAE · Japan ×2 JF1UVJ · Japan ×2 M8JJS · England ×2 M9NTS · England ×2 OE1AVO · Austria ×2 R4HNT · European Russia ×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 S57TW

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 · 4,651 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 708 km (approx.)
Last such locator decoded: 2026-09-21 05:39 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	S57TW S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 05:40	80m	+10 / -11	SQ7RN	+26 / -6	5	✓ Full exchange observed
09-21 05:36	80m	+11 / -	F6FTB	- / -10	2	✓ Closing fragment
09-21 05:35	80m	+9 / -6	SP1ZMO	+7 / -13	3	✓ Full exchange observed
09-21 05:31	80m	+12 / -	EB5AFK	- / -6	2	✓ Closing fragment
09-21 05:30	80m	- / -	SP1ZMO	+9 / -	4	Partial capture
09-21 05:29	80m	+6 / +1	DG0LFG	-2 / 0	5	✓ Full exchange observed
09-21 05:22	80m	+4 / -	N1IWP	- / -	11	Partial capture
09-21 05:09	80m	+4 / -	K5TA	- / -	20	Partial capture
09-21 05:05	80m	+8 / -	K5TA	- / -	2	Partial capture
09-21 05:03	80m	+7 / -10	F4LRA	-9 / -	4	✓ Closing observed
09-21 04:49	80m	+14 / -	K5TA	- / -	12	Partial capture
09-21 04:44	80m	+10 / -	KB3Z	- / -	4	Partial capture
09-21 04:42	80m	+10 / -	K8KWT	- / -	4	Partial capture
09-21 04:35	80m	+8 / -	K0KT	- / -	6	Partial capture
09-21 04:33	80m	+11 / -13	W9JOY	-16 / -16	6	✓ Full exchange observed
09-21 04:31	80m	+10 / -	N1IWP	- / -	4	Partial capture
09-21 04:30	80m	+10 / -	HK4QHD	- / -	2	Partial capture
09-21 04:27	80m	+11 / -	KQ4FMX	- / -19	5	✓ Closing fragment
09-21 04:25	80m	+14 / -	KB3Z	- / -	2	Partial capture
09-21 04:21	80m	+11 / -5	DO5WG	+3 / -3	4	✓ Full exchange observed
09-21 04:19	80m	+11 / -	HK4QHD	- / -	7	Partial capture
09-21 04:15	80m	-4 / -	UA3AGW	- / -3	2	✓ Closing fragment
09-21 04:05	80m	+7 / +2	DL1VVQ	+5 / +2	5	✓ Full exchange observed
09-21 04:01	80m	+6 / -2	F6HAA	-2 / -15	5	✓ Full exchange observed
09-21 04:00	80m	+7 / -	SV1DKR	+2 / +7	3	✓ Closing observed
09-21 03:47	80m	+12 / -3	DK7JR	-18 / -11	4	✓ Full exchange observed
09-21 03:35	80m	+14 / -	LY1DY	+12 / 0	4	✓ Closing observed
09-21 03:33	80m	+14 / +1	YO8RAW	+3 / -	3	✓ Closing observed
09-21 03:19	80m	+16 / -11	UT5MB	+16 / 0	4	✓ Full exchange observed
09-21 03:15	80m	+16 / -3	PA4PA	+8 / +7	5	✓ Full exchange observed
09-21 03:08	80m	+12 / -	EA5IT	- / -7	4	✓ Closing fragment
09-21 03:05	80m	+14 / -5	RK3ZB	+10 / +2	4	✓ Full exchange observed
09-21 03:05	80m	+12 / -	R2PE	+3 / +6	3	✓ Closing observed
09-21 02:59	80m	+12 / -3	EA5HAY	-13 / -20	5	✓ Full exchange observed
09-21 02:56	80m	+18 / -	EA5FQ	- / 0	4	Partial capture
09-21 02:50	80m	+11 / -7	RA6ZS	+3 / -13	5	✓ Full exchange observed
09-21 02:46	80m	+15 / -9	UR5WDI	+2 / -	2	✓ Closing observed
09-21 02:37	80m	+14 / -3	SQ2BXI	-18 / -6	5	✓ Full exchange observed
09-21 02:27	80m	+16 / -8	SP2ZAB	-14 / -22	6	✓ Full exchange observed
09-21 01:51	80m	+8 / -19	K9US	-12 / -17	4	✓ Full exchange observed
09-21 01:34	80m	+18 / -	IU3WIX	-17 / -15	3	✓ Closing observed
09-21 01:13	80m	+2 / -5	G8FAT	-7 / -17	3	✓ Full exchange observed
09-21 01:03	80m	+12 / -	UA9CR	-17 / -22	3	✓ Closing observed
09-21 01:01	80m	+10 / -	KP4AA	- / -10	2	✓ Closing fragment
09-21 00:38	80m	+18 / -10	G1DWG	-5 / -4	5	✓ Full exchange observed
09-21 00:32	80m	+11 / 0	DJ7XY	-10 / -8	4	✓ Full exchange observed
09-21 00:18	80m	+20 / -24	UK8FCM	-13 / -10	5	Partial capture
09-20 23:41	80m	+16 / -	TA2EE	- / -25	4	✓ Closing fragment
09-20 23:31	80m	+20 / -18	R9OAE	-8 / -12	15	✓ Full exchange observed
09-20 23:30	80m	+18 / -1	RZ6ALZ	+2 / +1	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
053545 +12 2592  SP1ZMO S57TW RR73
053615 +11 2592  CQ S57TW JN75
053645 +13 2592  F6FTB S57TW -10 (x2)
053745 +11 2592  CQ S57TW JN75 (x5)
054000 +28 2953  S57TW SQ7RN KO00
054015  +9 2592  SQ7RN S57TW -06
054030 +25 2953  S57TW SQ7RN R-11
054045 +12 2592  SQ7RN S57TW RR73
054100 +24 2953  S57TW SQ7RN 73
054130 -14 2592  S57TW IU1TLG JN35

60m

UTC    dB Audio  Message
212300  -3 2603  CQ S57TW JN75 (x3)
212415  -4 2490  S57TW F1PBZ +05
212430  -2 2603  F1PBZ S57TW R+01
212445  -5 2490  S57TW F1PBZ RR73
212500  -2 2603  F1PBZ S57TW RR73
212530  -3 2603  CQ S57TW JN75 (x2)
212630  -2 2603  OM0CS S57TW R-12 (x2)
212730  +0 2603  CQ S57TW JN75 (x4)

40m

UTC    dB Audio  Message
072030 +13 2858  HB9HYO S57TW RR73
072100 +10 2858  CQ S57TW JN75 (x5)
072315  -2 1343  S57TW HA1ZW JN86 (x2)
072400 +11 2857  HA1ZW S57TW -15
072415  -2 1343  S57TW HA1ZW R-15 (x3)
072530 +11 2857  HA1ZW S57TW RR73
072545  +4 1343  S57TW HA1ZW 73
022245  +2 2627  S57TW RU3GF -17

10m

UTC    dB Audio  Message
085345 -22 2215  S57TW RA9J RR73

160m

UTC    dB Audio  Message
025200  +2 2373  CQ S57TW JN75 (x6)
040430  +0 2130  SP9RPW S57TW JN75 (x2)
040515  +9 1877  S57TW SP9RPW +00
040530  -1 2130  SP9RPW S57TW R-08
040545  +8 1877  S57TW SP9RPW RR73
040815  +1 2130  EA5KA S57TW JN75 (x4)

20m

UTC    dB Audio  Message
065100  +4 2393  CQ S57TW JN75 (x3)
065215  +0 2394  S57TW IZ6BZQ JN63
065230  +8 2393  CQ S57TW JN75
065245  +1 2395  S57TW IZ6BZQ JN63
065300  +9 2394  CQ S57TW JN75
065315  +0 2395  S57TW IZ6BZQ JN63
065330  +0 2394  CQ S57TW JN75 (x7)

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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