S57UMU — 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 S57UMU, decoded by SO8OO in southeastern Poland. 108 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 15 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-11-05.

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 108 FT8 messages attributed to S57UMU as the transmitting token by decoded message structure across 15 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (90%), followed by 80 m (8%) and 20 m (2%). Several six-hour UTC windows tied for the largest share (78%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -6 dB.

Overview

108

Messages attributed

UTC dates decoded

Active 15-min windows

-6 dB

Estimated median S/N

Bands

80m · 9 40m · 97 20m · 2

First attributed message: 2026-06-11
Last attributed message: 2026-11-05 13:21 UTC

Observed FT8 message patterns

Attributed sample: 108 messages
Active dates: 15 UTC dates
Estimated median S/N: -6 dB
Estimated 10th-90th percentile: -20 to +5 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 23, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 62.

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 S57UMU in decoded directed-looking exchanges:

DL4KAG · Fed. Rep. of Germany ×2 F1PBZ · France ×2 CT7AUT · Portugal DA0M · Fed. Rep. of Germany DL1AG · Fed. Rep. of Germany DM5KM · Fed. Rep. of Germany EA5DKA · Spain MI7XHT · Northern Ireland PC6A · Netherlands S56LKP · Slovenia T77RN · San Marino IK2TPX · Italy

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 S57UMU

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 · 57 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 708 km (approx.)
Last such locator decoded: 2026-11-05 13:19 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	S57UMU S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-05 13:19	40m	+2 / +1	S56LKP	-14 / -	5	✓ Full exchange observed
11-05 13:18	40m	+2 / +1	F1PBZ	-4 / -7	4	✓ Full exchange observed
11-05 13:16	40m	+5 / -	DA0M	- / -19	2	✓ Closing fragment
11-05 13:15	40m	+4 / -4	PC6A	-9 / -3	5	✓ Full exchange observed
09-18 06:26	40m	-3 / -	MI7XHT	- / -8	3	✓ Closing fragment
09-18 06:23	80m	-21 / -	EA1DR	- / -	3	Partial capture
09-18 06:22	80m	-17 / -	MI0NWA	- / -	2	Partial capture
09-18 06:17	40m	+4 / -	II6IGTO	- / -	2	Partial capture
09-01 15:28	40m	-2 / -13	DL4KAG	-12 / 0	6	✓ Full exchange observed
09-01 15:27	40m	0 / -9	DL1AG	-8 / -6	5	✓ Full exchange observed
09-01 15:26	40m	+2 / -	F1PBZ	-13 / +4	3	✓ Closing observed
08-22 06:46	40m	0 / -	GU0SUP	- / -	4	Partial capture
08-22 06:44	40m	-4 / -6	F4AHJ	-20 / +8	5	Partial capture
08-20 06:17	40m	+6 / -9	DM5KM	+2 / +9	6	✓ Full exchange observed
08-20 06:11	40m	+3 / -	OJ0JR	- / -5	7	Partial capture
08-20 06:10	40m	0 / -	CT7AUT	- / 0	2	✓ Closing fragment
08-17 06:03	80m	-10 / -	IK2TPX	-13 / +6	3	✓ Closing observed
08-17 06:00	80m	-15 / -16	IK4LZH	-9 / -	7	Partial capture
08-16 06:49	40m	-22 / -	EA5DKA	- / -	2	✓ Closing fragment
08-16 06:45	40m	-22 / -	YO2LFP	- / +7	4	Partial capture
08-12 05:47	40m	-6 / -	T77RN	- / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
131545  +6  484  PC6A S57UMU RR73
131600 -10 1246  S57UMU PC6A 73
131615  +4  484  DA0M S57UMU -19 (x2)
131715  +1  484  CQ S57UMU JN75 (x2)
131800  -8  639  S57UMU F1PBZ +01
131815  +0  484  F1PBZ S57UMU R-07
131830  +0  639  S57UMU F1PBZ RR73
131845  +3  484  F1PBZ S57UMU 73
131945  +2  484  S56LKP S57UMU JN75
132030 -15 1739  S57UMU S56LKP +01
132045  +2  484  S56LKP S57UMU R+13
132100 -14 1740  S57UMU S56LKP RR73
132115  +2  484  S56LKP S57UMU 73

80m

UTC    dB Audio  Message
060015  -7  403  S57UMU IK4LZH -16 (x2)
060100 -16 2514  IK4LZH S57UMU R+18
060115  -5  403  S57UMU IK4LZH -16 (x2)
060200 -14  349  IK4LZH S57UMU R+18
060245 -14  403  S57UMU IK4LZH -16
060315 -13  605  S57UMU IK2TPX JN45
060400 -10  500  IK2TPX S57UMU +06 (x2)
062245 -17 1206  MI0NWA S57UMU JN75 (x2)
062345 -20 1206  EA1DR S57UMU JN75 (x3)

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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