ES4TRI — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Estonia Most frequent locator attributed to this token: KO39

Receiver-side FT8 activity involving ES4TRI, decoded by SO8OO in southeastern Poland. 453 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 28 UTC dates in the available aggregate history. Observed between 2026-08-13 and 2026-10-07.

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 453 FT8 messages attributed to ES4TRI as the transmitting token by decoded message structure across 28 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (47%), followed by 80 m (40%) and 60 m (10%). Most decodes (71%) fell within the six-hour window 17:00-23:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

453

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

160m · 13 80m · 182 60m · 44 40m · 213 20m · 1

First attributed message: 2026-08-13
Last attributed message: 2026-10-07 22:14 UTC

Observed FT8 message patterns

Attributed sample: 453 messages
Active dates: 28 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -20 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 136, moderate (-15 to -9 dB) 189, strong (≥ -8 dB) 128.

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 ES4TRI in decoded directed-looking exchanges:

HA7TM · Hungary ×3 DK7ZT · Fed. Rep. of Germany ×3 CT7AUT · Portugal ×2 DL1UDO · Fed. Rep. of Germany ×2 DL7ACA · Fed. Rep. of Germany ×2 EC3A · Spain ×2 F5PBG · France ×2 LZ2VQ · Bulgaria ×2 ON7DE · Belgium ×2 OS4K · Belgium ×2 R3SN · European Russia ×2 RD7O · 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 ES4TRI

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: KO39 · 168 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,114 km (approx.)
Last such locator decoded: 2026-10-07 21:52 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	ES4TRI S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-07 22:13	40m	-24 / -14	EA8UP	-4 / -1	5	✓ Full exchange observed
10-07 21:54	40m	-19 / -12	EW8DU	-9 / -6	5	✓ Full exchange observed
10-07 21:21	40m	- / -13	G0KEE	-14 / -	2	Partial capture
10-07 21:14	40m	- / -10	M7SZB	-12 / -	2	Partial capture
10-07 21:13	40m	- / -18	EA8BIA	-17 / -	2	Partial capture
10-07 19:55	80m	- / -	OM1FED	+3 / -	4	Partial capture
10-07 19:53	80m	-11 / -8	DC0GL	+4 / 0	5	✓ Full exchange observed
10-07 18:54	40m	-2 / -	G7COU	- / -3	3	Partial capture
10-07 18:49	40m	-4 / -	SP3MJK	- / -15	2	Partial capture
10-07 18:47	40m	-10 / -8	PA3BMB	-9 / -	4	✓ Closing observed
10-07 18:43	40m	-2 / -	DL2AOM	- / -19	4	✓ Closing fragment
10-06 19:42	40m	-18 / -	OM3TWM	- / +9	2	✓ Closing fragment
10-06 19:36	80m	0 / -16	RC6OU	+4 / +3	4	✓ Full exchange observed
10-06 19:33	80m	-6 / -	R2AL	+5 / -	6	✓ Full exchange observed
10-06 19:28	80m	-12 / -11	DO5OT	+10 / -5	14	✓ Full exchange observed
10-06 19:23	60m	- / -	DK4RH	-1 / -	4	Partial capture
10-06 19:18	60m	- / -18	PC2J	-6 / -	4	✓ Closing fragment
10-06 19:18	60m	- / -	SM3ULU	-11 / -	2	Partial capture
10-06 19:18	60m	- / -	YO4BEW	-16 / -	2	Partial capture
10-06 19:15	60m	- / -18	DK7UY	+12 / -	2	Partial capture
10-06 19:14	60m	- / -15	DH3YAK	-8 / -	2	✓ Closing fragment
10-06 19:12	60m	- / -2	SM3ULU	-17 / -	2	Partial capture
10-06 19:12	60m	- / -18	SP3CUG	-10 / -	4	Partial capture
10-06 19:01	160m	-12 / -8	YL2EA	-8 / -	4	✓ Closing observed
10-06 18:59	160m	-8 / -	SP4LIN	+12 / -15	3	✓ Closing observed
10-06 18:57	160m	- / -	SN6P	+3 / -	12	Partial capture
10-06 18:56	160m	-17 / -20	RU3VT	-21 / -14	4	Partial capture
10-06 18:55	160m	-17 / -12	RU6CH	-16 / -12	5	✓ Full exchange observed
10-06 18:55	160m	- / -11	SP4LIN	+7 / -	2	Partial capture
10-06 03:56	80m	-12 / -	YO8RAW	- / -3	2	✓ Closing fragment
10-06 03:54	80m	-11 / -16	R1AV	-4 / -11	5	✓ Full exchange observed
10-04 17:48	40m	-4 / -8	E75BO	-6 / -13	5	✓ Full exchange observed
10-03 23:27	80m	-14 / -11	SP9TBT	+5 / -6	6	✓ Full exchange observed
10-03 23:27	80m	-10 / -	M0MLS	-6 / -10	3	✓ Closing observed
10-03 22:25	40m	- / -	IS0KNY	+2 / -	3	Partial capture
10-03 22:12	40m	- / 0	IU4WSH	-6 / -	3	✓ Closing fragment
10-03 22:11	40m	- / -9	YO9JS	-1 / -	2	✓ Closing fragment
10-03 22:04	40m	- / -5	2E0MRK	-14 / -	2	Partial capture
10-03 22:03	40m	- / -10	G0ANS	+4 / -	3	✓ Closing fragment
10-03 20:51	40m	-8 / -	JR3NZC	- / -3	4	✓ Closing fragment
10-03 20:16	40m	-2 / -	EA4HWT	- / -	2	Partial capture
10-03 20:11	40m	-10 / -29	CT7AUT	-19 / -	5	✓ Closing observed
10-03 19:08	40m	- / -	R3BCK	-2 / -	2	Partial capture
10-03 19:07	40m	-9 / -	G5MJF	- / -16	4	Partial capture
10-03 19:06	40m	- / -11	M0PPT	-11 / -	2	Partial capture
10-03 18:59	40m	-10 / +5	DK3RV	+7 / -6	4	✓ Full exchange observed
10-03 18:58	40m	-11 / -9	DJ1TU	-2 / -11	12	✓ Full exchange observed
10-03 18:51	40m	-5 / -19	II5GG	+2 / -8	11	✓ Full exchange observed
10-03 18:49	40m	-4 / 0	R3LDK	-4 / -11	6	✓ Full exchange observed
10-03 18:48	40m	-7 / -1	ON4CFC	-4 / -8	4	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
211445 -11  637  ES4TRI M7SZB -10
212145 -13 2146  ES4TRI G0KEE IO84 (x2)
215230 -23 1117  CQ ES4TRI KO39                        a1
215330 -21 1118  DL6RS ES4TRI -08
215415  -7 1117  ES4TRI EW8DU KO52
215430 -17 1117  EW8DU ES4TRI -06
215445  -7 1117  ES4TRI EW8DU R-12
215500 -21 1117  EW8DU ES4TRI RR73
215515 -12 1117  ES4TRI EW8DU 73
221330  -6 2133  ES4TRI EA8UP -14 (x2)
221415 -24 2133  EA8UP ES4TRI R-01
221430  -3 2133  ES4TRI EA8UP -14 (x2)

80m

UTC    dB Audio  Message
193600  +1 2758  CQ ES4TRI KO39
193630  -1 2757  RC6OU ES4TRI +03
193645  +3 2756  ES4TRI RC6OU R-16
193700  +2 2758  RC6OU ES4TRI RR73
193715  +4 2757  ES4TRI RC6OU 73
195300  -7  941  CQ ES4TRI KO39
195315  +1 2261  ES4TRI DC0GL JO52
195330  -7  941  DC0GL ES4TRI +00
195345  +4 2261  ES4TRI DC0GL R-08
195400 -15 2258  DC0GL ES4TRI RR73
195415  +8 2261  ES4TRI DC0GL 73
195515  -6  716  ES4TRI OM1FED JN88 (x4)

60m

UTC    dB Audio  Message
191615 +13  393  ES4TRI DK7UY R-18
191815 -19 1553  ES4TRI YO4BEW KN35
191815 -13 2693  ES4TRI SM3ULU JP81
191815 -12 2196  ES4TRI PC2J JO22
191845 -12 1553  ES4TRI YO4BEW KN35
191845  -9 2692  ES4TRI SM3ULU JP81
191845  -5 2196  ES4TRI PC2J JO22 (x3)
192215 -21 1553  ES4TRI YO4BEW KN35
192315  -2 2693  ES4TRI DK4RH JO31
192345 -21 1692  ES4TRI SM3ULU JP81
192345  -1 2692  ES4TRI DK4RH JO31 (x3)

160m

UTC    dB Audio  Message
185930  -6  754  SP4LIN ES4TRI R-15
185945 +10 2460  ES4TRI SN6P JO80
190000 -10  754  SP4LIN ES4TRI R-15
190015 +12  754  ES4TRI SP4LIN RR73
190015  +2 2460  ES4TRI SN6P JO80 (x2)
190115  -7 2219  ES4TRI YL2EA KO26
190115  +6 2460  ES4TRI SN6P JO80
190145  -8 2219  ES4TRI YL2EA R-08
190145  -3 2460  ES4TRI SN6P JO80
190200 -12 2219  YL2EA ES4TRI RR73
190215 -10 2219  ES4TRI YL2EA 73
190215  +5 2460  ES4TRI SN6P JO80 (x3)

10m

UTC    dB Audio  Message
150415  -7 1592  ES4TRI PA1GLD JO21
150415  -7  776  ES4TRI DN9DKN R-13
150445  -6 1592  ES4TRI PA1GLD JO21
150445 -12  775  ES4TRI DN9DKN R-13
150515  -8 1592  ES4TRI PA1GLD JO21
150515  -5  775  ES4TRI DN9DKN 73
150615 -12 1592  ES4TRI PA1GLD RR73
150645 +13 2710  ES4TRI DF6QN JO41 (x2)
125130  -8 1491  ES4TRI CT7AUT IM67 (x3)
122500  -7 2291  ES4TRI EA7ATM -23 (x2)
123015  -2 2977  ES4TRI EA7LPL IM86

20m

UTC    dB Audio  Message
191045  +4  903  ES4TRI EA1FRP IN81 (x2)
191115 -10  327  ES4TRI DL6RS JN48
191145  +1  903  ES4TRI EA1FRP R-08
191145  -4  327  ES4TRI DL6RS JN48
191215  +4  903  ES4TRI EA1FRP R-08
191215  -4  327  ES4TRI DL6RS JN48
191245  +6  903  ES4TRI EA1FRP R-08
191315  -1  377  ES4TRI OO0O JO11
191315  +6  903  ES4TRI EA1FRP R-08
191345  -8  378  ES4TRI OO0O JO11
191345  +1  903  ES4TRI EA1FRP R-08 (x2)
191445  -9  377  ES4TRI OO0O JO11 (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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