SP4MCH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Poland Most frequent locator attributed to this token: KO03

Receiver-side FT8 activity involving SP4MCH, decoded by SO8OO in southeastern Poland. 57 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-12 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 57 FT8 messages attributed to SP4MCH as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (81%), followed by 20 m (11%) and 80 m (9%). Several six-hour UTC windows tied for the largest share (72%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (84%); the estimated median was -4 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-4 dB

Estimated median S/N

Bands

80m · 5 40m · 46 20m · 6

First attributed message: 2026-06-12
Last attributed message: 2026-09-21 16:38 UTC

Observed FT8 message patterns

Attributed sample: 57 messages
Active dates: 5 UTC dates
Estimated median S/N: -4 dB
Estimated 10th-90th percentile: -12 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 7, strong (≥ -8 dB) 48.

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 SP4MCH in decoded directed-looking exchanges:

R9FE · European Russia TF5B · Iceland UA4FET · European Russia EV1R · Belarus

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 SP4MCH

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: KO03 · 46 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 400 km (approx.)
Last such locator decoded: 2026-09-21 16:38 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	SP4MCH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 16:40	80m	- / 0	EV1R	+10 / -	2	✓ Closing fragment
09-21 16:38	80m	-10 / -	MM0TBH	- / -	2	Partial capture
09-21 16:29	40m	-4 / -	RY9W	- / -	3	Partial capture
09-20 07:18	40m	-12 / -13	TF5B	-19 / -	4	✓ Closing observed
09-20 07:14	40m	-4 / -	KQ4FMX	- / -	2	Partial capture
09-20 07:12	40m	-6 / -	N1IWP	- / -	6	Partial capture
09-20 06:15	40m	-2 / -	N1IWP	- / -	3	Partial capture
09-12 19:27	40m	-2 / -	RU3NCW	- / -	8	Partial capture
09-12 19:24	40m	-4 / -	R1QF	- / -	4	Partial capture
09-12 19:22	40m	-5 / -	UA4FET	-10 / -14	3	✓ Closing observed
09-12 19:20	40m	-7 / -9	R9FE	-8 / +5	5	✓ Full exchange observed
09-12 19:19	40m	-6 / +2	SP9ENV	-4 / -	2	Partial capture
09-12 19:18	40m	-5 / -	RU3NCW	- / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
190345 -12 1258  EH3ST SP4MCH KO03
164030 -24 1528  EA4IJS SP4MCH KO03
164200  -2 1956  SM2OTU SP4MCH KO03
163815  -5  829  MM0TBH SP4MCH KO03 (x2)
164030  +9 1473  SP4MCH EV1R +00 (x2)

40m

UTC    dB Audio  Message
071315  -8 1183  N1IWP SP4MCH KO03 (x2)
071415  -6 1183  KQ4FMX SP4MCH KO03 (x2)
071515  -3 1183  N1IWP SP4MCH KO03 (x3)
071800  -8 2021  TF5B SP4MCH KO03 (x2)
071845 -22 1800  SP4MCH TF5B -13 (x2)
072145 -10  741  N1IWP SP4MCH KO03
162945  -9 1140  RY9W SP4MCH KO03 (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.

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