JH4ADV — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving JH4ADV, decoded by SO8OO in southeastern Poland. 131 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 25 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-10-12.
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 131 FT8 messages attributed to JH4ADV as the transmitting token by decoded message structure across 25 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (66%), followed by 40 m (23%) and 20 m (9%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.
Overview
Bands
Last attributed message: 2026-10-12 21:19 UTC
Observed FT8 message patterns
- Attributed sample
- 131 messages
- Active dates
- 25 UTC dates
- Estimated median S/N
- -10 dB
- Estimated 10th-90th percentile
- -16 to +1 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 16, moderate (-15 to -9 dB) 58, strong (≥ -8 dB) 57.
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 JH4ADV 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 JH4ADV
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
- PM64 · 45 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,453 km (approx.)
- Last such locator decoded
- 2026-10-12 20:07 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 | JH4ADV S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-14 21:42 | 40m | - / -9 | IZ8CLM | -10 / - | 2 | ✓ Closing fragment |
| 10-14 21:39 | 40m | - / - | K2ZJ | -10 / - | 2 | Partial capture |
| 10-14 20:23 | 80m | - / -16 | F6CTT | +5 / - | 3 | ✓ Closing fragment |
| 10-14 20:22 | 80m | - / - | IK2CMN | -9 / - | 7 | Partial capture |
| 10-14 20:21 | 80m | - / -13 | ON4IQ | +8 / - | 2 | ✓ Closing fragment |
| 10-12 21:19 | 80m | -14 / - | PY5XT | - / -16 | 2 | ✓ Closing fragment |
| 10-12 21:08 | 80m | - / - | DO9BLX | +6 / - | 2 | Partial capture |
| 10-12 21:08 | 80m | - / - | S57MPU | -5 / - | 2 | Partial capture |
| 10-12 21:08 | 80m | - / - | SP9FZH | -6 / - | 2 | Partial capture |
| 10-12 20:18 | 80m | - / - | SP2BOT | -12 / - | 4 | Partial capture |
| 10-12 20:16 | 80m | - / - | G0HVQ | -1 / - | 2 | Partial capture |
| 10-12 20:16 | 80m | - / - | S57MPU | +1 / - | 4 | Partial capture |
| 10-12 20:16 | 80m | - / - | SP9FZH | +11 / - | 6 | Partial capture |
| 10-12 20:15 | 80m | +4 / -17 | SQ9BC | +6 / -15 | 4 | ✓ Full exchange observed |
| 10-12 20:08 | 80m | -2 / -4 | OH5KNL | +8 / -12 | 4 | ✓ Full exchange observed |
| 10-12 20:07 | 80m | +2 / - | YO2UKG | - / - | 2 | Partial capture |
| 10-12 20:05 | 80m | -2 / - | HB9GNH | - / - | 2 | Partial capture |
| 10-08 20:23 | 80m | - / - | DK1MCS | +5 / - | 7 | Partial capture |
| 10-08 20:22 | 80m | -10 / -12 | HA8AR | -13 / -15 | 4 | ✓ Full exchange observed |
| 10-08 20:18 | 80m | - / - | IZ5NRF | +6 / - | 6 | Partial capture |
| 10-08 20:18 | 80m | -18 / -11 | OK2SFP | +16 / -15 | 6 | ✓ Full exchange observed |
| 10-08 20:17 | 80m | - / -14 | OT7K | +14 / - | 2 | ✓ Closing fragment |
| 10-08 20:08 | 80m | - / -16 | IK0PHY | +4 / - | 3 | ✓ Closing fragment |
| 10-08 20:05 | 80m | - / - | DO2ANW | -10 / - | 7 | Partial capture |
| 10-08 20:04 | 80m | - / -17 | RK6OQ | -10 / - | 3 | ✓ Closing fragment |
| 10-08 20:03 | 80m | -8 / - | US5EDZ | - / - | 3 | Partial capture |
| 10-07 20:19 | 80m | - / -10 | OM3TWM | +4 / - | 2 | ✓ Closing fragment |
| 10-07 20:14 | 80m | - / - | IK0PHY | +6 / - | 2 | Partial capture |
| 10-01 20:42 | 80m | - / -14 | R7CD | -1 / - | 3 | ✓ Closing fragment |
| 09-30 21:43 | 40m | -10 / -10 | G8KHF | -1 / -19 | 4 | ✓ Full exchange observed |
| 09-30 21:39 | 40m | - / 0 | LA9GX | +2 / - | 2 | ✓ Closing fragment |
| 09-30 21:38 | 40m | - / -11 | M9DNC | -7 / - | 10 | Partial capture |
| 09-30 21:35 | 40m | -11 / - | ZS1BHJ | - / - | 2 | Partial capture |
| 09-28 20:26 | 80m | - / - | SQ2PQ | +16 / - | 2 | Partial capture |
| 09-28 20:24 | 80m | - / -11 | SQ2HEB | +12 / - | 2 | ✓ Closing fragment |
| 09-28 20:11 | 80m | -7 / - | 7Z1DH | - / - | 6 | Partial capture |
| 09-27 20:30 | 40m | - / - | SV1MOZ | -9 / - | 2 | Partial capture |
| 09-27 20:27 | 40m | - / -11 | F4EQA | -16 / - | 2 | ✓ Closing fragment |
| 09-27 20:27 | 40m | - / +3 | M6RTA | -5 / - | 4 | Partial capture |
| 09-27 20:27 | 40m | - / - | DL7KB | +6 / - | 2 | Partial capture |
| 09-27 20:27 | 40m | - / - | EA3AAY | -14 / - | 2 | ✓ Closing fragment |
| 09-27 20:27 | 40m | - / -7 | F5LQ | -4 / - | 4 | Partial capture |
| 09-27 20:27 | 40m | - / - | YO2UKG | -16 / - | 4 | Partial capture |
| 09-27 20:24 | 40m | - / -7 | PA3AGN | -6 / - | 5 | Partial capture |
| 09-27 20:22 | 40m | - / -9 | CT1FIU | -10 / - | 3 | Partial capture |
| 09-27 20:22 | 40m | - / - | G1ROK | -5 / - | 4 | Partial capture |
| 09-27 20:21 | 40m | - / -14 | M6RTA | -3 / - | 2 | Partial capture |
| 09-27 20:19 | 40m | -13 / - | BA8BLK | - / -16 | 2 | ✓ Closing fragment |
| 09-27 20:18 | 40m | - / -17 | PA0ABM | +4 / - | 9 | ✓ Closing fragment |
| 09-27 20:12 | 40m | -12 / -7 | EA7LZ | -6 / -16 | 3 | ✓ Full exchange observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 213945 +1 2301 JH4ADV LA9GX RR73 214045 -13 519 JH4ADV M9DNC -05 (x3) 214300 -1 805 JH4ADV G8KHF -10 214315 -8 519 JH4ADV M9DNC -07 214315 -10 406 G8KHF JH4ADV R-19 214330 -1 805 JH4ADV G8KHF RR73 214345 -8 519 JH4ADV M9DNC -07 214345 -9 406 G8KHF JH4ADV 73 214415 -5 519 JH4ADV M9DNC -07 213900 -10 283 JH4ADV K2ZJ FN13 (x2) 214200 -11 2142 JH4ADV IZ8CLM -09 (x2)
UTC dB Audio Message 211915 -11 2106 PY5XT JH4ADV R-16 (x2) 202130 +6 1945 JH4ADV ON4IQ -13 (x2) 202230 -3 2299 JH4ADV IK2CMN JN45 (x2) 202300 +4 2479 JH4ADV F6CTT IN97 202330 -9 2299 JH4ADV IK2CMN JN45 202330 +4 2479 JH4ADV F6CTT R-16 202400 -8 2298 JH4ADV IK2CMN JN45 202400 +7 2480 JH4ADV F6CTT 73 202430 -9 2298 JH4ADV IK2CMN JN45 (x2) 202530 -17 1661 JH4ADV SP5HZM JO92 202530 -10 2299 JH4ADV IK2CMN JN45
UTC dB Audio Message 204215 -1 2751 JH4ADV DM1KM JO71 204215 -5 2097 JH4ADV DJ3JD JO52 204245 +5 946 JH4ADV SP5GW KO12 204245 -6 2536 JH4ADV ON7NQ JO21 204245 -22 1408 JH4ADV F8IPH JN05 204245 +17 2880 JH4ADV F5IDJ -10 204245 +9 2751 JH4ADV DM1KM JO71 204245 -6 2097 JH4ADV DJ3JD JO52 204315 +10 946 JH4ADV SP5GW KO12 (x2) 204345 -6 729 JH4ADV DK6XY JO53 (x4) 194300 -20 1596 JH4ADV GM4YXI -14
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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