SM7DSZ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO66

Receiver-side FT8 activity involving SM7DSZ, decoded by SO8OO in southeastern Poland. 37 FT8 messages attributed to this token as transmitter, on 40m, 10m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-26 and 2026-09-18.

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 SM7DSZ as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (78%), followed by 10 m (22%). Most decodes (89%) fell within the six-hour window 14:00-20:00 UTC. 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 · 29 10m · 8

First attributed message: 2026-06-26
Last attributed message: 2026-09-18 19:55 UTC

Observed FT8 message patterns

Attributed sample: 37 messages
Active dates: 3 UTC dates
Estimated median S/N: -9 dB
Estimated 10th-90th percentile: -21 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 8, moderate (-15 to -9 dB) 11, strong (≥ -8 dB) 18.

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 SM7DSZ in decoded directed-looking exchanges:

5B4AMX · Cyprus 9A2EY · Croatia IK7YZB · Italy IQ6PE · Italy IZ0EGA · Italy IZ2EID · Italy DL3MIB · Fed. Rep. of Germany IV3FVM · Italy UA4FEN · European Russia DL9KM · Fed. Rep. of Germany ON5RZ · Belgium R8LCA · Asiatic Russia

Most frequent locator attributed to SM7DSZ

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: JO66 · 27 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 934 km (approx.)
Last such locator decoded: 2026-09-18 19:55 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	SM7DSZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-18 19:50	40m	-9 / -	RI1FJZ	- / -	10	Partial capture
09-18 19:48	40m	-8 / -	OZ1NIB	- / -	2	Partial capture
09-18 19:41	40m	-3 / -	YU4OCC	- / -	3	Partial capture
09-18 19:30	40m	-3 / -	RI1FJZ	- / -	3	Partial capture
09-18 19:23	40m	-11 / -	HZ1TT	- / -	3	Partial capture
09-18 19:22	40m	-8 / -7	DL9KM	-1 / -	4	✓ Closing observed
09-18 19:19	40m	-8 / -	IQ4JO	- / 0	2	Partial capture
09-18 19:16	40m	-10 / -	JA0LFV	- / -	2	Partial capture
09-18 19:12	40m	- / -17	RA3ZT	-7 / -	3	✓ Closing fragment
09-18 19:10	40m	- / -13	ON5RZ	+6 / -	4	✓ Closing fragment
08-17 08:35	20m	- / -18	F1HFP	-7 / -	6	Partial capture
08-06 11:13	10m	-21 / -	9A2EY	- / -5	2	✓ Closing fragment
08-06 11:12	10m	-17 / -15	5B4AMX	-18 / -	2	✓ Closing observed
06-26 14:56	10m	-18 / -25	IK7YZB	-13 / -8	5	✓ Full exchange observed
06-26 14:42	10m	- / -20	IQ6PE	-4 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
194130  -4  610  YU4OCC SM7DSZ JO66 (x3)
194845  -8 2599  OZ1NIB SM7DSZ JO66 (x2)
195045 -10  360  RI1FJZ SM7DSZ JO66 (x10)

20m

UTC    dB Audio  Message
142030  -2 2695  SM7DSZ IV3FVM RR73
101430 -19 1217  SM7DSZ UA4FKT LO23
101600  +0 1106  SM7DSZ DL3MIB 73
053715 -24 1492  SM7DSZ UA4FEN RR73
081200 -17 1833  SM7DSZ F4FSY +02
081730 -14 1939  SM7DSZ EI9IB -11
083500  -9 1976  SM7DSZ F1HFP JN28 (x6)

10m

UTC    dB Audio  Message
144215  -5 1452  SM7DSZ IQ6PE -20 (x2)
144445 -20 1938  SM7DSZ IZ2EID RR73
145345 -21 1737  CQ SM7DSZ JO66 (x2)
145630 -13 2569  SM7DSZ IK7YZB JN80
145645 -17 1736  IK7YZB SM7DSZ -08
145700 -12 2569  SM7DSZ IK7YZB R-25
145715 -20 1736  IK7YZB SM7DSZ RR73
145730 -14 2570  SM7DSZ IK7YZB 73
111200 -18 1902  SM7DSZ 5B4AMX -15
111245 -17 1946  5B4AMX SM7DSZ 73
111315 -21 1946  9A2EY SM7DSZ -05 (x2)
111445 -20 1946  IZ0EGA SM7DSZ RR73

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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