JH3IVO — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM74

Receiver-side FT8 activity involving JH3IVO, decoded by SO8OO in southeastern Poland. 33 FT8 messages attributed to this token as transmitter, on 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-11 and 2026-08-28.

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 33 FT8 messages attributed to JH3IVO as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (100%) fell within the six-hour window 13:00-19:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (70%); the estimated median was -7 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-7 dB

Estimated median S/N

Bands

20m · 33

First attributed message: 2026-06-11
Last attributed message: 2026-08-28 18:52 UTC

Observed FT8 message patterns

Attributed sample: 33 messages
Active dates: 6 UTC dates
Estimated median S/N: -7 dB
Estimated 10th-90th percentile: -11 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 9, strong (≥ -8 dB) 23.

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 JH3IVO in decoded directed-looking exchanges:

ON4ASV · Belgium ×2 HA7KJ · Hungary ON4IQ · Belgium DF8IU · Fed. Rep. of Germany HB9CZF · Switzerland R6FX · European Russia R7ZY · European Russia

Most frequent locator attributed to JH3IVO

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 · 22 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,565 km (approx.)
Last such locator decoded: 2026-08-28 18:50 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	JH3IVO S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-17 19:51	160m	- / -	RU3DBT	-18 / -	2	Partial capture
09-01 19:29	40m	- / -15	DF8IU	+8 / -	2	✓ Closing fragment
09-01 19:19	40m	- / -15	R7ZY	+7 / -	4	✓ Closing fragment
09-01 19:15	40m	- / -	LB7ZG	+6 / -	3	Partial capture
09-01 19:14	40m	- / -14	ON4ASV	+20 / -	2	✓ Closing fragment
09-01 19:14	40m	- / -	R7ZY	+10 / -	6	Partial capture
08-28 18:51	20m	-13 / -	HA7KJ	- / -6	2	✓ Closing fragment
08-28 18:48	20m	-11 / -	<...>	- / -	4	Partial capture
08-28 18:38	20m	-7 / -	<...>	- / -	4	Partial capture
08-21 13:17	20m	-8 / -	<...>	-8 / -9	5	Partial capture
08-14 13:43	20m	- / -22	ON4IQ	+7 / -	3	✓ Closing fragment
08-04 17:50	40m	- / -24	US3EW	-12 / -	2	Partial capture
08-04 17:48	40m	- / -17	R6FX	-3 / -	4	✓ Closing fragment
08-04 17:46	40m	- / -20	HB9CZF	0 / -	2	✓ Closing fragment
08-04 17:45	40m	- / -	YO8AAZ	-13 / -	4	Partial capture
08-03 12:38	20m	- / -19	ON4ASV	-4 / -	2	✓ Closing fragment
07-24 13:20	10m	- / -7	TK5K	-11 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

160m

UTC    dB Audio  Message
195130 -19 1208  JH3IVO RU3DBT KO95 (x2)

40m

UTC    dB Audio  Message
191430 +12 2590  JH3IVO R7ZY KN98
191430 +23  338  JH3IVO ON4ASV RR73
191500 +13 2590  JH3IVO R7ZY KN98
191500  +1 2945  JH3IVO LB7ZG JP50
191530  +6 2589  JH3IVO R7ZY KN98
191530 +11 2945  JH3IVO LB7ZG JP50
191600  +7 2590  JH3IVO R7ZY KN98
191600  +6 2945  JH3IVO LB7ZG JP50
191630  +7 2590  JH3IVO R7ZY KN98 (x5)
192930  +7 2140  JH3IVO DF8IU -15 (x2)

20m

UTC    dB Audio  Message
131745  -7 2868  <...> JH3IVO PM74 (x3)
131900  -8  453  JH3IVO <...> +11
131915  -8 2868  <...> JH3IVO R-09 (x9)
185115 -10  477  HA7KJ JH3IVO -06 (x2)

10m

UTC    dB Audio  Message
132045 -14  496  JH3IVO TK5K -07 (x2)

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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