JH4IFF — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving JH4IFF, decoded by SO8OO in southeastern Poland. 545 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 55 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-10-16.
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 545 FT8 messages attributed to JH4IFF as the transmitting token by decoded message structure across 55 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (44%), followed by 40 m (31%) and 80 m (22%). 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 -12 dB.
Overview
Bands
Last attributed message: 2026-10-16 20:29 UTC
Observed FT8 message patterns
- Attributed sample
- 545 messages
- Active dates
- 55 UTC dates
- Estimated median S/N
- -12 dB
- Estimated 10th-90th percentile
- -19 to -3 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 150, moderate (-15 to -9 dB) 226, strong (≥ -8 dB) 169.
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 JH4IFF 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 JH4IFF
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
- PM74 · 237 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 8,565 km (approx.)
- Last such locator decoded
- 2026-10-16 20:28 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 | JH4IFF S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-16 20:27 | 40m | -18 / -8 | IK5ZPU | +1 / -8 | 8 | ✓ Full exchange observed |
| 10-16 20:26 | 40m | -18 / -16 | F6CCS | +8 / - | 3 | ✓ Closing observed |
| 10-14 21:00 | 80m | - / -15 | IZ8FWN | -6 / - | 2 | ✓ Closing fragment |
| 10-14 20:57 | 80m | -8 / - | IZ8FWN | - / - | 2 | Partial capture |
| 10-14 20:53 | 80m | -5 / -3 | 9A2AJ | -2 / - | 3 | ✓ Closing observed |
| 10-14 20:53 | 80m | -12 / -13 | SP7IWA | -10 / -16 | 5 | ✓ Full exchange observed |
| 10-14 20:50 | 80m | -5 / - | S57UX | - / - | 2 | Partial capture |
| 10-14 20:45 | 160m | - / -19 | E73S | +15 / - | 4 | ✓ Closing fragment |
| 10-13 20:19 | 40m | -20 / - | R6DOB/M | - / - | 3 | Partial capture |
| 10-13 20:14 | 40m | - / -5 | IK4RVY | +2 / - | 5 | ✓ Closing fragment |
| 10-13 20:13 | 40m | - / -15 | IQ3TR | +16 / - | 2 | ✓ Closing fragment |
| 10-12 21:05 | 80m | -3 / -8 | SV2CWV | -8 / - | 4 | ✓ Closing observed |
| 10-12 21:01 | 80m | - / - | SP9FZH | -2 / - | 6 | Partial capture |
| 10-12 21:01 | 80m | -2 / - | OK1DX | - / - | 2 | Partial capture |
| 10-12 21:00 | 80m | -3 / -9 | YO2UKG | -10 / - | 4 | Partial capture |
| 10-12 20:59 | 80m | 0 / - | RC0CD | - / -4 | 2 | ✓ Closing fragment |
| 10-12 20:58 | 80m | -3 / -12 | SQ9BC | -3 / -14 | 4 | ✓ Full exchange observed |
| 10-12 20:20 | 40m | -18 / - | IT9GJK | - / -15 | 2 | Partial capture |
| 10-12 20:13 | 160m | -18 / -20 | EA6Y | +6 / - | 3 | ✓ Closing observed |
| 10-11 21:16 | 80m | - / - | G0IUS | +12 / - | 3 | Partial capture |
| 10-11 21:09 | 80m | - / - | SM3ULU | -12 / - | 2 | Partial capture |
| 10-11 21:07 | 80m | - / - | R6YY | -10 / - | 2 | ✓ Closing fragment |
| 10-11 21:06 | 80m | - / - | SQ9DDY | 0 / - | 6 | Partial capture |
| 10-11 21:05 | 80m | - / - | G0IUS | +6 / - | 2 | Partial capture |
| 10-11 21:05 | 80m | - / -18 | DO1ID | +7 / - | 5 | Partial capture |
| 10-11 21:04 | 80m | -12 / -14 | HB9BLQ | +8 / - | 4 | ✓ Closing observed |
| 10-11 21:00 | 80m | -8 / - | SP6BS | - / - | 2 | Partial capture |
| 10-11 20:59 | 80m | -18 / - | SP9TBT | -9 / -22 | 3 | ✓ Closing observed |
| 10-11 20:56 | 80m | - / -22 | DO1ID | +6 / - | 8 | Partial capture |
| 10-11 20:55 | 80m | -7 / -17 | IZ8XQC | +5 / -21 | 6 | ✓ Full exchange observed |
| 10-11 20:52 | 80m | -9 / -12 | HA1YN | +3 / - | 4 | ✓ Closing observed |
| 10-11 20:52 | 80m | - / - | SP6JIU | +22 / - | 3 | Partial capture |
| 10-11 20:52 | 80m | -11 / -12 | R3HH | -2 / - | 3 | ✓ Closing observed |
| 10-11 20:49 | 80m | - / -17 | DO2GGH | +3 / - | 5 | Partial capture |
| 10-11 20:49 | 80m | - / - | ER5GB | +4 / - | 3 | Partial capture |
| 10-11 20:48 | 80m | -12 / -6 | SP7CMW | +9 / -13 | 5 | ✓ Full exchange observed |
| 10-11 20:40 | 80m | - / -14 | SQ8AZT | +2 / - | 2 | ✓ Closing fragment |
| 10-11 20:39 | 80m | - / - | G0HVQ | +8 / - | 2 | Partial capture |
| 10-11 20:35 | 80m | - / - | G0HVQ | +3 / - | 3 | Partial capture |
| 10-11 20:28 | 80m | - / -24 | YO5ODL | +1 / - | 3 | ✓ Closing fragment |
| 10-09 20:34 | 40m | - / -14 | F6KFT | +7 / - | 4 | ✓ Closing fragment |
| 10-08 20:40 | 80m | -18 / - | YO3AI | -12 / - | 3 | ✓ Closing observed |
| 10-08 20:17 | 80m | - / -13 | YO3AI | -6 / - | 3 | Partial capture |
| 10-08 20:14 | 80m | - / - | DK1MCS | +4 / - | 6 | Partial capture |
| 10-08 20:13 | 80m | - / - | DO2ANW | -8 / - | 9 | Partial capture |
| 10-08 20:12 | 80m | -14 / -18 | OK2SFP | +15 / -19 | 6 | ✓ Full exchange observed |
| 10-07 20:09 | 80m | - / -8 | OM3TWM | +2 / - | 2 | ✓ Closing fragment |
| 10-06 20:27 | 80m | - / - | OM2WW | +16 / - | 2 | Partial capture |
| 10-06 20:26 | 80m | - / -6 | SQ8T | +6 / - | 6 | Partial capture |
| 10-06 20:22 | 80m | - / - | OM2WW | +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 201915 -20 1330 R6DOB/M JH4IFF PM74 (x3) 202245 -10 2118 JH4IFF IW0BSQ +01 202600 +9 2454 JH4IFF F6CCS -16 (x2) 202645 -18 1345 F6CCS JH4IFF 73 202715 -18 1345 IK5ZPU JH4IFF PM74 (x4) 202900 +1 790 JH4IFF IK5ZPU -08 202915 -18 1345 IK5ZPU JH4IFF R-08 202930 +1 790 JH4IFF IK5ZPU RR73 202945 -18 1345 IK5ZPU JH4IFF 73
UTC dB Audio Message 205245 -5 2364 S57UX JH4IFF PM74 205330 -8 1719 JH4IFF SP7IWA KO02 205330 -5 2656 JH4IFF 9A2AJ -03 (x2) 205415 -5 2657 9A2AJ JH4IFF 73 205430 -11 1719 JH4IFF SP7IWA KO02 205445 -12 1720 SP7IWA JH4IFF -16 205500 -15 1719 JH4IFF SP7IWA R-13 (x2) 205700 +11 1966 JH4IFF S57UX -11 205715 -8 2020 IZ8FWN JH4IFF PM74 (x2) 210030 -6 2019 JH4IFF IZ8FWN -15 (x2) 210130 -13 324 JH4IFF Z33PB -16
UTC dB Audio Message 200700 -20 2001 JH4IFF R8LCA MO27 200700 +31 2597 JH4IFF OK2BUZ R-20 (x4) 195930 +13 1401 JH4IFF LZ2IP -13 (x3) 201300 +4 655 JH4IFF EA6Y -20 (x2) 201345 -18 656 EA6Y JH4IFF 73 204515 +12 2495 JH4IFF E73S JN92 (x4)
UTC dB Audio Message 060500 -14 2072 JH4IFF DL9KM JN68 (x6)
UTC dB Audio Message 081045 -19 1590 JH4IFF A71DA -13 (x2) 082200 -4 1252 JH4IFF II7MGXX -12 082230 +8 1252 JH4IFF RR73; F4LZZ <...> +00 082600 -7 1787 JH4IFF TA6B -15
UTC dB Audio Message 200430 -10 1030 SP5MXZ JH4IFF R-10 (x2) 200530 -10 1029 ON1JP JH4IFF R-14 (x4) 205200 -15 1991 JH4IFF OZ2SPACE -20 (x6) 202245 -20 1419 OJ0YL JH4IFF PM74 (x2) 202715 -9 509 <...> JH4IFF PM74
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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