SM5TJH — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving SM5TJH, decoded by SO8OO in southeastern Poland. 29 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-30 and 2026-09-17.
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 29 FT8 messages attributed to SM5TJH as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (55%), followed by 80 m (38%) and 20 m (3%). Several six-hour UTC windows tied for the largest share (66%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (66%); the estimated median was -1 dB.
Overview
Bands
Last attributed message: 2026-09-17 19:02 UTC
Observed FT8 message patterns
- Attributed sample
- 29 messages
- Active dates
- 4 UTC dates
- Estimated median S/N
- -1 dB
- Estimated 10th-90th percentile
- -19 to +13 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 5, strong (≥ -8 dB) 19.
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 SM5TJH in decoded directed-looking exchanges:
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 SM5TJH
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 · 13 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,048 km (approx.)
- Last such locator decoded
- 2026-09-17 18:50 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 | SM5TJH S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-17 19:02 | 40m | 0 / - | OZ1GXW | - / +8 | 2 | Partial capture |
| 09-17 18:52 | 40m | - / -13 | OZ1GXW | 0 / - | 2 | Partial capture |
| 09-17 18:50 | 40m | -4 / -6 | LX1GG | +1 / -9 | 5 | ✓ Full exchange observed |
| 09-17 18:46 | 40m | 0 / - | LX1GG | - / - | 3 | Partial capture |
| 07-04 01:24 | 40m | -11 / - | KQ4ZAX | - / - | 2 | Partial capture |
| 07-04 01:19 | 80m | - / - | UA4FKT | -4 / - | 2 | Partial capture |
| 07-04 01:18 | 80m | +12 / +10 | CR2WWA | -18 / -6 | 4 | ✓ Full exchange observed |
| 07-04 01:13 | 80m | +14 / +6 | DL9KM | -11 / -8 | 6 | ✓ Full exchange observed |
| 07-04 01:13 | 80m | +8 / - | UA4FKT | -14 / -19 | 5 | Partial capture |
| 07-04 01:11 | 80m | +3 / - | SK3WWA | -17 / -3 | 5 | ✓ Full exchange observed |
| 07-04 01:05 | 40m | -18 / - | HJ4FLO | - / - | 4 | Partial capture |
| 07-04 01:03 | 40m | -17 / - | OA4ENG | - / -12 | 2 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 010815 -12 955 HJ4FLO SM5TJH JO78 012430 -10 791 KQ4ZAX SM5TJH JO78 (x2) 184600 +2 2607 LX1GG SM5TJH JO78 (x4) 185045 -1 2618 SM5TJH LX1GG -06 185100 -4 1272 LX1GG SM5TJH R-09 185115 +3 2618 SM5TJH LX1GG RR73 185130 -4 1272 LX1GG SM5TJH 73 185215 +3 2224 SM5TJH OZ1GXW -13 (x2) 190200 +2 1272 OZ1GXW SM5TJH R+08 (x2)
UTC dB Audio Message 084500 -14 2210 NL8F SM5TJH JO78
UTC dB Audio Message 011330 -15 1170 SM5TJH DL9KM JN68 011345 +13 747 DL9KM SM5TJH -08 011400 -5 1170 SM5TJH DL9KM R+06 011415 +15 825 DL9KM SM5TJH RRR 011430 -8 1170 SM5TJH DL9KM 73 011515 +6 825 UA4FKT SM5TJH -19 (x3) 011745 +16 364 IR0WWA SM5TJH JO78 011830 -19 968 SM5TJH CR2WWA +10 011845 +13 753 CR2WWA SM5TJH R-06 011900 -17 969 SM5TJH CR2WWA RR73 011915 +12 753 CR2WWA SM5TJH 73 011930 -3 755 SM5TJH UA4FKT LO23 (x2)
UTC dB Audio Message 093715 -19 1885 CR2WWA SM5TJH R+04
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.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee