SM4XDJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO69

Receiver-side FT8 activity involving SM4XDJ, decoded by SO8OO in southeastern Poland. 14 FT8 messages attributed to this token as transmitter, on 60m, 40m, across 1 UTC dates in the available aggregate history. Last observed 2026-09-11.

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 14 FT8 messages attributed to SM4XDJ as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (86%), followed by 40 m (14%). In this small sample, the estimated median decoder S/N was -8 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-8 dB

Estimated median S/N

Bands

60m · 12 40m · 2

First attributed message: 2026-09-11
Last attributed message: 2026-09-11 18:36 UTC

Observed FT8 message patterns

Attributed sample: 14 messages
Active dates: 1 UTC dates
Estimated median S/N: -8 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 8.

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 SM4XDJ in decoded directed-looking exchanges:

DL1UDO · Fed. Rep. of Germany DL8TV · Fed. Rep. of Germany F1PBZ · France 9A4ZM · Croatia DD6ZV · Fed. Rep. of Germany DK1XAM · Fed. Rep. of Germany DK7UY · Fed. Rep. of Germany DL5DQZ · Fed. Rep. of Germany ES5RY · Estonia G4JYU · England PF1B · Netherlands SM6XVI · Sweden

Most frequent locator attributed to SM4XDJ

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: JO69 · 3 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,202 km (approx.)
Last such locator decoded: 2026-09-11 18:34 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	SM4XDJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-11 18:39	80m	- / -5	SM7OYP	+1 / -	3	✓ Closing fragment
09-11 18:35	60m	-11 / +10	SM6XVI	-12 / -	4	✓ Closing observed
09-11 18:34	60m	-8 / -8	G4JYU	-8 / -2	4	✓ Full exchange observed
09-11 18:33	60m	-7 / -4	ES5RY	-10 / +2	4	✓ Full exchange observed
09-11 18:31	60m	-7 / -11	9A4ZM	+9 / +7	5	✓ Full exchange observed
09-11 18:29	60m	- / -7	SM7XON	-9 / -	3	✓ Closing fragment
09-11 18:28	60m	-7 / -7	DL5DQZ	+6 / -	6	✓ Closing observed
09-11 18:28	60m	-8 / -	PF1B	-12 / -	2	✓ Closing observed
09-11 18:26	60m	-8 / -2	DK1XAM	-5 / -	4	✓ Closing observed
09-11 18:23	40m	- / -8	DL8TV	+2 / -	3	✓ Closing fragment
09-11 18:23	40m	-12 / -5	F1PBZ	-7 / -	4	✓ Closing observed
09-11 18:20	40m	- / -	DL1EDR	+12 / -	2	Partial capture
09-11 18:20	40m	-13 / -2	DL1UDO	+2 / -	2	✓ Closing observed
09-09 16:25	60m	- / -4	DK7UY	-7 / -	4	✓ Closing fragment
09-09 16:25	60m	- / -13	DD6ZV	+5 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
183945  +1 2844  SM4XDJ SM7OYP JO66 (x3)

60m

UTC    dB Audio  Message
183300  -9 2788  CQ SM4XDJ JO69                        a1
183330  -7 2787  ES5RY SM4XDJ +02
183345 -11 1932  SM4XDJ ES5RY R-04
183400  -7 2788  ES5RY SM4XDJ RR73
183415  -9 1931  SM4XDJ ES5RY 73
183430 -10 2788  CQ SM4XDJ JO69
183445 -10 1596  SM4XDJ OZ1SMB JO54
183445  -9  730  SM4XDJ G4JYU JO01
183500  -8 2787  G4JYU SM4XDJ -02
183515  -9  731  SM4XDJ G4JYU R-08
183545 -12  996  SM4XDJ SM6XVI JO66
183545  -6  731  SM4XDJ G4JYU 73
183615 -11  996  SM4XDJ SM6XVI R+10
183630 -11 2787  SM6XVI SM4XDJ RR73
183645 -12  996  SM4XDJ SM6XVI 73

40m

UTC    dB Audio  Message
182015  +2 2722  SM4XDJ DL1UDO R-02
182030 -13 2794  DL1UDO SM4XDJ RR73
182045 +10 2793  SM4XDJ DL1EDR JO41 (x2)
182315  -8 2188  SM4XDJ F1PBZ -05
182315  +2 1489  SM4XDJ DL8TV JN49
182345  -7 2188  SM4XDJ F1PBZ -05
182345  +3 1489  SM4XDJ DL8TV R-08 (x2)
182445  -7 2188  SM4XDJ F1PBZ RR73
182500 -12 2843  F1PBZ SM4XDJ 73

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