SM4DDS — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving SM4DDS, decoded by SO8OO in southeastern Poland. 8 FT8 messages attributed to this token as transmitter, on 80m, across 3 UTC dates in the available aggregate history. Observed between 2026-09-03 and 2026-09-19.
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 8 FT8 messages attributed to SM4DDS as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (100%). In this small sample, the estimated median decoder S/N was -13 dB; no usual signal pattern is inferred.
Overview
Observed FT8 message patterns
- Attributed sample
- 8 messages
- Active dates
- 3 UTC dates
- Estimated median S/N
- -13 dB
- S/N percentile sample
- Too small
- Recurring-pattern threshold
- Not met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 5, strong (≥ -8 dB) 2.
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 SM4DDS in decoded directed-looking exchanges:
Most frequent locator attributed to SM4DDS
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
- JO79 · 3 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,148 km (approx.)
- Last such locator decoded
- 2026-09-19 20:06 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 | SM4DDS S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-19 20:06 | 80m | -11 / - | RI1FJZ | - / - | 2 | Partial capture |
| 09-15 19:35 | 80m | -16 / - | OH6NIO | -6 / +5 | 4 | ✓ Closing observed |
| 09-03 01:56 | 80m | -6 / -5 | IQ4JO | -9 / +2 | 5 | ✓ Full exchange observed |
| 08-27 07:29 | 40m | - / -8 | DJ0MAB | -13 / - | 3 | ✓ Closing fragment |
| 08-20 15:03 | 20m | - / - | F4LHZ | -8 / - | 3 | Partial capture |
| 07-13 12:51 | 10m | - / -19 | F1PBZ | +9 / - | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 015600 -8 1897 SM4DDS IQ4JO JN63 015615 -5 1134 IQ4JO SM4DDS +02 015630 -8 1897 SM4DDS IQ4JO R-05 015645 -7 1134 IQ4JO SM4DDS RR73 015700 -12 1896 SM4DDS IQ4JO 73 193545 -10 2751 SM4DDS OH6NIO KP12 193600 -17 1600 OH6NIO SM4DDS +05 (x2) 193645 -3 2751 SM4DDS OH6NIO 73 155600 -14 1408 CQ SM4DDS JO79 155630 -13 1408 DO1MER SM4DDS -03 200615 -12 916 RI1FJZ SM4DDS JO79 (x2)
UTC dB Audio Message 072915 -10 1500 SM4DDS DJ0MAB JN49 (x3)
UTC dB Audio Message 150045 -11 2051 SM4DDS M7TUP IO90 150300 -9 1309 SM4DDS PD3LKN JO22 150330 -15 2051 SM4DDS M7TUP IO90 150330 -9 2426 SM4DDS F4LHZ JN18 150400 -10 1309 SM4DDS R9FDE/P 73 150400 -10 2426 SM4DDS F4LHZ JN18 (x2)
UTC dB Audio Message 125100 +9 2740 SM4DDS F1PBZ -19 (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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