S51JM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Slovenia Most frequent locator attributed to this token: JN76

Receiver-side FT8 activity involving S51JM, decoded by SO8OO in southeastern Poland. 62 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-08-08 and 2026-09-15.

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 62 FT8 messages attributed to S51JM as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (89%), followed by 20 m (11%). Several six-hour UTC windows tied for the largest share (56%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -9 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-9 dB

Estimated median S/N

Bands

40m · 55 20m · 7

First attributed message: 2026-08-08
Last attributed message: 2026-09-15 06:57 UTC

Observed FT8 message patterns

Attributed sample: 62 messages
Active dates: 8 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -13 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 29, strong (≥ -8 dB) 28.

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 S51JM in decoded directed-looking exchanges:

LA1SNA · Norway DC9GT · Fed. Rep. of Germany DJ0MAB · Fed. Rep. of Germany DL1JEL · Fed. Rep. of Germany DM2HW · Fed. Rep. of Germany EA2KV · Spain OK2VCR · Czech Republic PA3PWY · Netherlands SP7TF · Poland UT0IN · Ukraine

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 S51JM

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: JN76 · 50 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 631 km (approx.)
Last such locator decoded: 2026-09-15 06:57 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	S51JM S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 06:54	40m	-11 / -	ZL3AAU	- / -	7	Partial capture
09-15 06:47	40m	-8 / -	N8HRZ	- / -	6	Partial capture
09-08 19:21	40m	-5 / -	DC9GT	- / -14	2	✓ Closing fragment
09-08 19:19	40m	-6 / -	PA3PWY	- / -3	2	✓ Closing fragment
09-08 19:15	40m	-6 / +1	DL1JEL	+6 / +3	4	✓ Full exchange observed
09-07 06:26	40m	-8 / -16	UT0IN	-5 / -3	4	✓ Full exchange observed
09-07 06:24	40m	-7 / -	J38DX	- / -	4	Partial capture
09-06 06:21	40m	-12 / -	J38DX	- / -	8	Partial capture
08-27 05:56	40m	+3 / -	ZL3GK	- / -	3	Partial capture
08-27 05:55	40m	-9 / -	ZL3GAV	- / -	2	Partial capture
08-26 20:33	40m	-6 / -	EA2KV	-7 / -	2	✓ Closing observed
08-26 20:31	40m	-6 / -17	SP7TF	-14 / -1	4	✓ Full exchange observed
08-26 20:30	40m	- / -	DM2HW	+5 / -	3	✓ Closing fragment
08-26 20:24	40m	-10 / -	VJ6X	- / -	5	Partial capture
08-26 20:21	40m	-9 / +3	DJ0MAB	-4 / -	4	✓ Closing observed
08-26 20:21	40m	- / +1	OK2VCR	+5 / -	3	✓ Closing fragment
08-24 08:18	20m	- / -19	TI5RR	-18 / -	4	Partial capture
08-24 08:12	20m	-10 / -	TI5RR	- / -	3	Partial capture
08-08 14:41	20m	-22 / -	K6ND	- / -	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
192330  -5 1718  CQ S51JM JN76 (x2)
064715  -8 1910  N8HRZ S51JM JN76 (x6)
065400  -9 1905  ZL3AAU S51JM JN76 (x7)

20m

UTC    dB Audio  Message
144100 -20 1910  K6ND S51JM JN76 (x4)
081230 -11 2313  TI5RR S51JM JN76 (x3)
081815 -19  908  S51JM TI5RR -19 (x5)
055915  -9 1407  S51JM LA1SNA 73
055945  -8 1251  S51JM EA5HM IM99

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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