S57MK — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

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

Receiver-side FT8 activity involving S57MK, decoded by SO8OO in southeastern Poland. 837 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 22 UTC dates in the available aggregate history. Observed between 2026-07-21 and 2026-10-17.

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 837 FT8 messages attributed to S57MK as the transmitting token by decoded message structure across 22 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (62%), followed by 80 m (13%) and 160 m (13%). Several six-hour UTC windows tied for the largest share (52%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

837

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

160m · 106 80m · 107 60m · 516 40m · 105 20m · 3

First attributed message: 2026-07-21
Last attributed message: 2026-10-17 05:36 UTC

Observed FT8 message patterns

Attributed sample: 837 messages
Active dates: 22 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -21 to -7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 327, moderate (-15 to -9 dB) 372, strong (≥ -8 dB) 138.

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 S57MK in decoded directed-looking exchanges:

F1PBZ · France ×4 F4HSB · France ×2 DK1MBY · Fed. Rep. of Germany ×2 DK9RC · Fed. Rep. of Germany ×2 DL4YDR · Fed. Rep. of Germany ×2 ON4MGV · Belgium ×2 ON5PU · Belgium ×2 SP6U · Poland ×2 SQ2NUH · Poland ×2 UR4LL · Ukraine DL4KSD · Fed. Rep. of Germany DL7ULA · Fed. Rep. of Germany

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 S57MK

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 · 490 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 708 km (approx.)
Last such locator decoded: 2026-10-17 05:36 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	S57MK S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-17 05:33	80m	-13 / -9	OM3ZAS	-12 / -10	4	✓ Full exchange observed
10-16 18:21	80m	-6 / -16	DD8BA	-2 / -12	5	✓ Full exchange observed
10-16 18:20	80m	- / -	SP1MGM	+5 / -	3	Partial capture
10-16 18:16	80m	-10 / -22	OK1AY	+8 / -10	4	✓ Full exchange observed
10-16 18:10	80m	- / -	DO1MDO	+3 / -	3	Partial capture
10-16 18:07	80m	- / -10	DA6NEL	+8 / -	2	Partial capture
10-16 18:05	80m	-12 / -10	F4FSY	-9 / -11	4	✓ Full exchange observed
10-16 16:20	40m	- / -16	DK4RH	-9 / -	4	✓ Closing fragment
10-16 16:15	40m	- / -14	ON3MOH	-8 / -	2	✓ Closing fragment
10-16 05:30	40m	- / -17	DJ0MAB	-6 / -	2	Partial capture
10-16 05:28	40m	- / -6	LZ2XF	-11 / -	3	✓ Closing fragment
10-16 05:27	40m	-15 / -	VE2LBI	- / -	3	Partial capture
10-16 05:21	60m	- / -	SP1ZMO	+2 / -	4	Partial capture
10-16 05:17	60m	-12 / -	EG46PPA	- / -	3	Partial capture
10-16 05:14	60m	-19 / -	N8OQ	- / -19	3	✓ Closing fragment
10-16 05:12	60m	-18 / -1	DK9RC	-13 / -12	5	✓ Full exchange observed
10-16 05:08	60m	-12 / 0	SP5EXA	+2 / +10	7	✓ Full exchange observed
10-16 05:06	60m	-12 / -1	YO4BEW	-8 / -15	5	✓ Full exchange observed
10-16 05:05	60m	-11 / -	EG46PPA	- / -	3	Partial capture
10-16 05:03	60m	-16 / -24	VP2MAW	-10 / -13	3	Partial capture
10-16 05:01	80m	-12 / -15	DO1OAS	-15 / -15	4	✓ Full exchange observed
10-16 05:00	80m	-9 / -16	DO5HOK	-12 / -	3	✓ Closing observed
10-16 04:58	80m	-14 / -	HI8R	- / -	3	Partial capture
10-16 04:56	80m	-14 / -	DO1MER	- / -14	3	✓ Closing fragment
10-16 04:53	80m	-8 / -17	SP7SZJ	+1 / 0	5	✓ Full exchange observed
10-14 18:37	80m	- / -21	RX3ASQ	-4 / -	2	Partial capture
10-14 18:22	80m	-8 / -21	R7CD	-2 / -10	4	Partial capture
10-14 18:21	80m	-16 / -	DO2HC	- / +1	2	✓ Closing fragment
10-14 04:45	40m	- / -15	OH3OJ	-2 / -	2	Partial capture
10-14 04:41	40m	- / -14	UA3ZQN	-1 / -	4	✓ Closing fragment
10-14 04:40	40m	- / +2	SV2AOB	-5 / -	3	✓ Closing fragment
10-14 04:31	80m	-7 / -	DK3TNA	-1 / -11	6	Partial capture
10-14 04:30	80m	-10 / -	YO4CPO	- / -6	2	✓ Closing fragment
10-14 04:27	80m	-15 / -19	M9XPN	-15 / -17	7	✓ Full exchange observed
10-14 04:26	80m	-20 / -9	F5HNQ	+3 / 0	5	✓ Full exchange observed
10-14 04:24	80m	-12 / -	SQ9EJ	-3 / -7	3	✓ Closing observed
10-14 04:19	80m	-10 / +3	DK9RC	-6 / -9	7	✓ Full exchange observed
10-14 04:19	80m	-14 / -18	EB3JT	-13 / -	7	✓ Closing observed
10-14 04:17	80m	- / -7	IQ4JO	+12 / -	2	✓ Closing fragment
10-14 03:55	160m	-15 / -16	SP8XGU	+17 / -7	4	✓ Full exchange observed
10-14 03:48	160m	-20 / -17	LZ1ST	-2 / +6	8	✓ Full exchange observed
10-14 03:47	160m	-9 / -	UX7QV	- / -	3	Partial capture
10-13 18:07	160m	-20 / -2	SQ9PBV	+2 / -	4	✓ Closing observed
10-13 18:01	160m	- / -	DL4KSD	-12 / -	2	✓ Closing fragment
10-13 18:01	160m	- / -25	HF5A	+4 / -	3	✓ Closing fragment
10-13 17:56	160m	-18 / -24	SQ8GBG	0 / -4	5	✓ Full exchange observed
10-13 17:52	160m	- / -4	SQ6WA	+8 / -	3	✓ Closing fragment
10-13 04:08	160m	-16 / -	UA3ZUX	- / -	2	Partial capture
10-13 04:01	160m	-23 / -	EA5JK	- / -	2	Partial capture
10-13 03:59	160m	-22 / -16	OK1FAK	+10 / -	4	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
052830  -9 2032  CQ S57MK JN75 (x7)
053345 -11 2033  S57MK OM3ZAS -09
053400 -13 2033  OM3ZAS S57MK R-10
053415 -14 2034  S57MK OM3ZAS RR73
053430 -13 2033  OM3ZAS S57MK 73
053500 -11 2033  CQ S57MK JN75 (x4)

40m

UTC    dB Audio  Message
052830 -12 1797  S57MK LZ2XF KN33 (x3)
053030  -6 2067  S57MK DJ0MAB JN49 (x2)
161045  +0 2065  S57MK DL1NRC JN39
161200 -22 2064  UA4CGR S57MK JN75
161300 -20 2064  UA9LKL S57MK JN75
161545 -11 1301  S57MK ON3MOH -14 (x2)
162000 -18 2066  CQ S57MK JN75
162015  -8 2065  S57MK DK4RH JO31 (x4)

160m

UTC    dB Audio  Message
035915 -15 1338  CQ S57MK JN75 (x14)
152830 -18 1487  S57MK YU1EW RR73

60m

UTC    dB Audio  Message
051230 -14  929  S57MK DK9RC JN58
051245 -18 2057  DK9RC S57MK -12
051300 -14  929  S57MK DK9RC R-01
051315 -19 2057  DK9RC S57MK RR73
051330 -10  929  S57MK DK9RC 73
051415 -23 2057  N8OQ S57MK JN75 (x3)
051715 -12 2056  EG46PPA S57MK JN75 (x3)
052130  -1 2058  S57MK SP1ZMO JO73 (x4)

20m

UTC    dB Audio  Message
164430 -24 1374  S57MK F1PPH JN07 (x5)

10m

UTC    dB Audio  Message
100045  -6 2642  S57MK F1PBZ -10 (x2)
075600 -19 1566  S57MK UR4LL 73

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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