JA4HEU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan

Receiver-side FT8 activity involving JA4HEU, decoded by SO8OO in southeastern Poland. 23 related FT8 messages, observed on 20m, 10m, across 9 UTC dates. Heard between 2026-06-01 and 2026-08-19.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

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

Overview

Related messages

CQ messages

UTC dates heard

-11 dB

Mean decoder S/N

Bands

20m 10m

First seen: 2026-06-01
Last seen: 2026-08-19 21:12 UTC

Frequent QSO partners observed at SO8OO

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

EA3NG · Spain HB9OAB · Switzerland R8PD · Asiatic Russia F8FUA · France CR7BRV · Portugal UF4S · European Russia TI5RR · Costa Rica

Activity Heatmap

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	JA4HEU S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-19 23:10	20m	- / -	F8FUA	-15 / -	2	✓ Closing fragment
07-23 06:44	20m	- / -24	EA3NG	-8 / -	2	✓ Closing fragment
07-21 00:20	20m	- / -16	CR7BRV	-8 / -	2	✓ Closing fragment
06-12 23:53	20m	- / -11	R8PD	-10 / -	2	✓ Closing fragment
06-12 23:27	20m	- / -22	R4HFX	-14 / -	3	Partial capture
06-12 23:11	20m	- / -10	<...>	-9 / -	2	Partial capture
06-12 22:57	20m	- / -12	HB9OAB	-11 / -	2	✓ Closing fragment
06-06 12:44	20m	- / -15	UF4S	-6 / -	2	✓ Closing fragment
06-01 07:22	20m	- / -7	TI5RR	-18 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

20m

UTC    dB Audio  Message
231130  -9 1933  JA4HEU <...> -10 (x2)
232745 -13 1586  JA4HEU R4HFX -22 (x3)
235330 -13 1473  JA4HEU R8PD -11 (x2)
053645 -13 1762  JA4HEU <...> -03 (x2)
002045  -8  631  JA4HEU CR7BRV -16 (x2)
064430  -8 1645  JA4HEU EA3NG -24 (x2)
231045 -17 1526  JA4HEU F8FUA RR73 (x2)

10m

UTC    dB Audio  Message
092300  -1  820  JA4HEU 9X5KM +01

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.