SK5SM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO78

Receiver-side FT8 activity involving SK5SM, decoded by SO8OO in southeastern Poland. 37 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-07-19 and 2026-07-25.

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 37 FT8 messages attributed to SK5SM as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

20m · 37

First attributed message: 2026-07-19
Last attributed message: 2026-07-25 12:04 UTC

Observed FT8 message patterns

Attributed sample: 37 messages
Active dates: 2 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -21 to -4 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 14, strong (≥ -8 dB) 6.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with SK5SM in decoded directed-looking exchanges:

EA3EDU · Spain DF3JO · Fed. Rep. of Germany DK8HC · Fed. Rep. of Germany DL5DQZ · Fed. Rep. of Germany F3PI · France GJ0KYZ · Jersey IU8UHK · Italy LZ1ZF · Bulgaria OK4RQ · Czech Republic OZ0HC · Denmark PA7FB · Netherlands PA8S · Netherlands

Most frequent locator attributed to SK5SM

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: JO78 · 16 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,048 km (approx.)
Last such locator decoded: 2026-07-25 12:04 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	SK5SM S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-01 10:51	20m	- / -11	GJ0KYZ	-8 / -	2	✓ Closing fragment
07-25 12:06	20m	- / -	F3PI	-16 / -	3	✓ Closing fragment
07-25 12:04	20m	- / -	DL1HQN	-1 / -	2	Partial capture
07-25 11:57	20m	- / -	RW6HP	-24 / -	2	Partial capture
07-25 11:56	20m	- / -	DL1FLW	-15 / -	2	Partial capture
07-25 11:56	20m	- / -	PD1ADA	-20 / -	4	Partial capture
07-25 11:53	20m	-15 / -	OZ0HC	- / +10	2	✓ Closing fragment
07-19 10:59	20m	-18 / -	PA7FB	- / -8	2	✓ Closing fragment
07-19 10:57	20m	-12 / -	DF3JO	- / -14	2	✓ Closing fragment
07-19 10:55	20m	-18 / -	DB1EF	- / +1	2	Partial capture
07-19 10:52	20m	-17 / -	F5PBG	- / -11	3	Partial capture
07-19 10:48	20m	- / +9	UT7UJ	+3 / -	5	Partial capture
07-19 10:43	20m	- / -	F4BJN	-10 / -	2	Partial capture
07-19 10:41	20m	-18 / -	IU8UHK	- / -19	2	✓ Closing fragment
07-19 10:38	20m	-14 / -	DL5DQZ	- / +4	2	✓ Closing fragment
07-19 10:35	20m	-18 / -	YL3MJ	- / -	4	Partial capture
07-19 10:31	20m	-7 / -	CR7BRV	- / -	2	Partial capture
07-19 10:27	20m	-2 / -	CR7BRV	- / -	4	Partial capture
07-12 11:50	10m	- / -23	EA3EDU	-20 / -	2	✓ Closing fragment
07-04 11:37	20m	- / -18	LZ1ZF	-5 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
115715 -23 1582  SK5SM RW6HP LN14
115715 -13  864  SK5SM DL1FLW JO61
115730 -18 2035  SK5SM PD1ADA JO21
115745 -24 1582  SK5SM RW6HP LN14
115800 -24 2035  SK5SM PD1ADA JO21
115930 -14  864  SM5MEK SK5SM +07
120100 -15  864  SP9DAT SK5SM RRR
120400  -6  864  CQ SK5SM JO78
120415  -4  864  SK5SM DL1HQN JO61 (x2)
120615 -17  865  SK5SM F3PI JN25 (x3)
105100  -9  888  SK5SM GJ0KYZ -11 (x2)

10m

UTC    dB Audio  Message
115045 -18 1666  SK5SM EA3EDU R-23 (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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