JH0HZO — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM97

Receiver-side FT8 activity involving JH0HZO, decoded by SO8OO in southeastern Poland. 40 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-31.

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 40 FT8 messages attributed to JH0HZO as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (58%), followed by 40 m (43%). 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

Messages attributed

UTC dates decoded

Active 15-min windows

-10 dB

Estimated median S/N

Bands

40m · 17 20m · 23

First attributed message: 2026-06-06
Last attributed message: 2026-08-31 20:05 UTC

Observed FT8 message patterns

Attributed sample: 40 messages
Active dates: 5 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -17 to +4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 16.

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 JH0HZO in decoded directed-looking exchanges:

CQ0ODX · Portugal R50RKZ · European Russia 4K6FO · Azerbaijan AP2N · Pakistan IS0LAY · Sardinia R7ZY · European Russia SV9QWC · Crete YT7TZ · Serbia

Most frequent locator attributed to JH0HZO

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: PM97 · 25 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,513 km (approx.)
Last such locator decoded: 2026-08-30 21:10 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	JH0HZO S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-30 21:15	40m	- / -	UX1VT	+6 / -	2	Partial capture
08-30 20:26	40m	- / -	YO9BGU	-10 / -	3	Partial capture
08-30 20:25	40m	- / -23	G4DBW	-8 / -	2	Partial capture
08-30 20:20	40m	- / -	OM7TJ	+10 / -	9	Partial capture
08-30 20:13	40m	- / -	IU5HIU	-6 / -	2	Partial capture
08-30 20:13	40m	- / -	HA9PP	+1 / -	5	Partial capture
08-30 20:12	40m	- / -	SP8ONV	-1 / -	2	Partial capture
08-30 20:11	40m	-20 / -16	SV9QWC	-11 / -18	4	✓ Full exchange observed
08-30 20:05	40m	- / -	YO9BGU	+6 / -	5	Partial capture
08-28 20:25	40m	-12 / -	II7MGBR	- / -	2	Partial capture
08-28 20:24	40m	-11 / -	RA3ZT/QRP	- / -	2	Partial capture
08-28 20:22	40m	- / -21	DK7ZT	-6 / -	3	Partial capture
08-28 20:22	40m	- / -16	IS0LAY	-11 / -	3	✓ Closing fragment
08-28 20:20	40m	-12 / -6	4K6FO	-16 / -	5	✓ Closing observed
08-28 20:18	40m	- / -6	R7ZY	+9 / -	3	✓ Closing fragment
08-28 20:16	40m	- / -	EA3EDU	-7 / -	7	Partial capture
08-28 20:16	40m	- / -	UW5KW	-10 / -	8	Partial capture
08-28 20:15	40m	-9 / -9	YT7TZ	+6 / -11	9	✓ Full exchange observed
08-15 07:26	20m	- / -	MI9PBM	+5 / -	7	Partial capture
08-15 07:25	20m	- / -3	R50RKZ	-11 / -	2	✓ Closing fragment
06-23 00:14	20m	- / -17	CQ0ODX	-5 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
202515  -8 2189  JH0HZO G4DBW -23 (x2)
202615 -11 1076  JH0HZO YO9BGU KN34 (x3)
202715  -7 2713  JH0HZO IU5HIU JN53
202930 -18  231  G4DBW JH0HZO PM97
203245 -21  231  LX9UN JH0HZO PM97
203615 -13 2459  JH0HZO HA9PP KN07
211045 -15  298  <...> JH0HZO PM97
211400  -5  542  JH0HZO ZA/IK3BNO -17
211500  +3  298  JH0HZO UX1VT KN68 (x2)
200545 -13 2824  <...> JH0HZO R-18
200730 -10 1395  JH0HZO UR9QQ KN77

20m

UTC    dB Audio  Message
001430  -4 1271  JH0HZO CQ0ODX -17 (x2)
054745  -5 1762  JH0HZO <...> -01 (x2)
072530 -13 2181  JH0HZO R50RKZ -03 (x2)
072630  +9  751  JH0HZO MI9PBM IO64 (x7)

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.

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