JA4HEU — FT8 station from Japan

Japan Grid: ?

Amateur radio station JA4HEU operating from Japan. 24 FT8 spots received at SO8OO WebSDR, active on 20m, 10m, over 8 days, best SNR +2 dB. Heard between 2026-04-27 and 2026-06-12.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee

Overview

Total spots

CQ calls

Days active

-9 dB

Avg SNR

Bands

20m 10m

First seen: 2026-04-27
Last seen: 2026-06-12 21:54 UTC

Frequent QSO partners observed at SO8OO

Stations JA4HEU worked most often, as logged from our receiver:

HB9OAB · Switzerland R8PD · Asiatic Russia RL6MT · European Russia UF4S · European Russia TI5RR · Costa Rica

Activity Heatmap

Location

QSO Logbook (as observed from SO8OO)

Format: our rx / partner reports

Time	Band	JA4HEU	Partner	Partner SNR	Msgs
06-12 23:53	20m	-10 / -	R8PD	- / -11	2	✓ Confirmed
06-12 23:27	20m	-14 / -	R4HFX	- / -22	3	Partial
06-12 23:11	20m	-9 / -	<...>	- / -10	2	Partial
06-12 22:57	20m	-11 / -	HB9OAB	- / -12	2	✓ Confirmed
06-06 12:44	20m	-6 / -	UF4S	- / -15	2	✓ Confirmed
06-01 07:22	20m	-18 / -	TI5RR	- / -7	2	✓ Confirmed
04-27 09:25	20m	-5 / -	ON6AA	- / -	5	Partial

Station Log

20m

UTC    dB  Freq  Message
045345 -17 2552  RL6MT JA4HEU 73
072230 -16  890  JA4HEU TI5RR -07 (x2)
124400  -9 1504  JA4HEU UF4S -15 (x2)
225730 -11 2294  JA4HEU HB9OAB -12 (x2)
225930  -3  651  JA4HEU IU2VBP -14
231130  -9 1933  JA4HEU <...> -10 (x2)
232745 -13 1586  JA4HEU R4HFX -22 (x3)
235330 -13 1473  JA4HEU R8PD -11 (x2)

10m

UTC    dB  Freq  Message
115330  +2 2304  JA4HEU RR73; PA4X <...> +06
092300  -1  820  JA4HEU 9X5KM +01