JF4HDR — FT8 station from Japan
Amateur radio station JF4HDR operating from Japan (grid square JN88). 722 FT8 spots received at SO8OO WebSDR, 4 CQ calls, active on 160m, 60m, 40m, 20m, 10m, over 37 days, best SNR +26 dB. Heard between 2026-04-21 and 2026-06-25.
FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee
Overview
722
Total spots
4
CQ calls
37
Days active
-1 dB
Avg SNR
Bands
20m
40m
60m
10m
160m
First seen: 2026-04-21
Last seen: 2026-06-25 19:36 UTC
Last seen: 2026-06-25 19:36 UTC
Frequent QSO partners observed at SO8OO
Stations JF4HDR worked most often, as logged from our receiver:
Activity Heatmap
Location
QSO Logbook (as observed from SO8OO)
Format: our rx / partner reports
| Time | Band | JF4HDR | Partner | Partner SNR | Msgs | |
|---|---|---|---|---|---|---|
| 06-25 21:22 | 20m | -16 / - | HB9TIH | - / -19 | 4 | ✓ Confirmed |
| 06-25 21:15 | 20m | -11 / - | EA7BD | - / -20 | 4 | ✓ Confirmed |
| 06-25 20:56 | 40m | -10 / - | EA8UP | - / -17 | 7 | ✓ Confirmed |
| 06-23 20:00 | 40m | -8 / - | YO8RQP | - / - | 2 | Partial |
| 06-23 19:59 | 40m | -7 / - | UR5ZHJ | - / -11 | 2 | ✓ Confirmed |
| 06-23 19:46 | 40m | +5 / - | UA3GU | - / -2 | 2 | ✓ Confirmed |
| 06-23 19:45 | 40m | -14 / - | YL3CU | - / -8 | 2 | ✓ Confirmed |
| 06-16 21:00 | 20m | - / - | F1PAR | -13 / - | 2 | Partial |
| 06-16 20:34 | 20m | -7 / - | F1HFP | - / - | 3 | Partial |
| 06-16 20:33 | 20m | - / - | OZ7CL | -6 / - | 2 | Partial |
| 06-16 20:32 | 20m | - / - | DK8RE | -6 / - | 2 | ✓ Confirmed |
| 06-16 20:29 | 20m | -8 / -3 | RI0SP | -5 / -10 | 4 | ✓ Complete |
| 06-16 20:28 | 20m | - / -16 | PD0IFI | -3 / - | 2 | ✓ Confirmed |
| 06-16 20:27 | 20m | - / -18 | BG5FRH | -3 / - | 5 | Partial |
| 06-16 20:25 | 20m | - / -11 | IZ7XNB | -2 / - | 2 | ✓ Confirmed |
| 06-16 20:23 | 20m | - / -20 | LU1EAF | -1 / - | 4 | ✓ Confirmed |
| 06-16 20:21 | 20m | - / - | OK1ZJK | +1 / - | 3 | Partial |
| 06-16 20:20 | 20m | +8 / - | F1POK | +2 / - | 2 | ✓ Verified |
| 06-16 20:18 | 20m | - / -21 | YO5IM | -1 / - | 3 | ✓ Confirmed |
| 06-16 20:16 | 20m | - / -17 | DJ0VOG | +2 / - | 4 | ✓ Confirmed |
| 06-16 20:14 | 20m | - / -19 | IZ4JMA | +2 / - | 2 | ✓ Confirmed |
| 06-16 20:13 | 20m | +3 / - | EA1IOK | - / - | 3 | Partial |
| 06-16 20:12 | 20m | -13 / - | R1BEO | +4 / -3 | 2 | ✓ Verified |
| 06-16 20:09 | 20m | -20 / -6 | R1BEO | +7 / -3 | 2 | Partial |
| 06-16 20:09 | 20m | +4 / - | F1HFP | - / - | 10 | Partial |
| 06-16 20:08 | 20m | - / -11 | HB9TIH | +4 / - | 2 | ✓ Confirmed |
| 06-16 20:05 | 20m | - / +6 | RW3ATR | +4 / - | 3 | Partial |
| 06-16 20:04 | 20m | +25 / +8 | IW9HPG | -1 / - | 3 | ✓ Complete |
| 06-16 20:03 | 20m | -3 / - | F4NGC | - / - | 3 | Partial |
| 06-16 20:03 | 20m | - / -12 | DK3TNA | +2 / - | 2 | ✓ Confirmed |
| 06-16 20:02 | 20m | - / +6 | LA2JKA | +2 / - | 2 | ✓ Confirmed |
| 06-16 20:01 | 20m | +2 / - | ON3AVT | - / - | 13 | Partial |
| 06-16 20:01 | 20m | -2 / - | F4AMF | - / - | 2 | Partial |
| 06-16 20:00 | 20m | 0 / - | F4NJB | - / - | 5 | Partial |
| 06-16 20:00 | 20m | +6 / - | G7FSI | - / -14 | 2 | Partial |
| 06-15 20:32 | 40m | -2 / - | Z62NS | - / -9 | 5 | ✓ Confirmed |
| 06-14 20:17 | 40m | -10 / - | YT2FA | - / -18 | 4 | ✓ Confirmed |
| 06-14 20:17 | 40m | -3 / - | R4FV | - / - | 3 | Partial |
| 06-14 20:16 | 40m | -5 / - | IQ0VT | - / -13 | 3 | ✓ Confirmed |
| 06-13 20:34 | 20m | - / - | T88RR | 0 / - | 7 | Partial |
| 06-13 20:28 | 20m | -3 / - | IK5EEA | +1 / -13 | 14 | ✓ Complete |
| 06-13 20:23 | 20m | - / - | HA2AI | -2 / - | 2 | Partial |
| 06-13 20:20 | 20m | - / - | EA1DMB | +2 / - | 4 | Partial |
| 06-13 20:18 | 20m | - / -21 | 9W2XUT | +4 / - | 3 | ✓ Confirmed |
| 06-13 20:09 | 40m | 0 / - | IZ0JSE | - / -13 | 3 | ✓ Confirmed |
| 06-13 20:08 | 40m | +18 / - | 9A1CCB | - / -15 | 2 | ✓ Confirmed |
| 06-13 19:44 | 40m | +12 / - | SP9LCW | - / -13 | 8 | ✓ Confirmed |
| 06-13 19:39 | 40m | -5 / - | UA3PHB | - / -8 | 8 | ✓ Confirmed |
| 06-13 19:23 | 20m | -9 / - | LZ1BT | +3 / -12 | 5 | Partial |
| 06-13 19:15 | 20m | - / -15 | LY4AA | -3 / - | 2 | ✓ Confirmed |
Station Log
20m
UTC dB Freq Message 203430 -5 2661 OZ7CL JF4HDR PM64 203445 -8 2154 JF4HDR F1HFP JN28 (x2) 203830 -9 764 <...> JF4HDR PM64 210000 -14 1126 F1PAR JF4HDR PM64 (x2) 211500 -10 1918 JF4HDR EA7BD IM77 (x4) 212215 -17 1481 JF4HDR HB9TIH JN36 (x4) 213645 -18 1652 JF4HDR OM0RX JN88
40m
UTC dB Freq Message 195315 -22 1735 JF4HDR OT8T JO21 195915 -8 2209 JF4HDR UR5ZHJ -11 (x2) 200015 -9 2682 JF4HDR YO8RQP KN37 (x2) 200145 -24 1736 JF4HDR OT8T JO21 200830 -7 577 JF4HDR R6FX R-12 201945 -4 2743 JF4HDR 9A2AJ -10 205615 -10 1723 JF4HDR EA8UP -17 (x7)
160m
UTC dB Freq Message 213800 -16 1388 JF4HDR S50PV JN76
10m
UTC dB Freq Message 090300 -5 1096 JF4HDR 9K2MP -13 (x3) 090900 -20 1828 JF4HDR YE3AOV OI62 (x3) 104245 -14 2285 JF4HDR 5Z4VJ -08 (x4) 080145 -20 2096 JF4HDR HA9PP KN07 083645 -13 2495 JF4HDR ZS4JAN RR73 103900 +9 2088 JF4HDR SK0TM -08
60m
UTC dB Freq Message 200615 -17 1532 JF4HDR DK7ZT +00 (x4)