JA5ICH — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving JA5ICH, decoded by SO8OO in southeastern Poland. 35 FT8 messages attributed to this token as transmitter, on 20m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-07-21.

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 35 FT8 messages attributed to JA5ICH 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%). 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 -8 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-8 dB

Estimated median S/N

Bands

20m · 35

First attributed message: 2026-06-09
Last attributed message: 2026-07-21 20:17 UTC

Observed FT8 message patterns

Attributed sample: 35 messages
Active dates: 6 UTC dates
Estimated median S/N: -8 dB
Estimated 10th-90th percentile: -20 to +1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 10, moderate (-15 to -9 dB) 7, strong (≥ -8 dB) 18.

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 JA5ICH in decoded directed-looking exchanges:

CR7BRV · Portugal CT7AGM · Portugal EA1B · Spain SQ8M · Poland RW4F · European Russia UA3PY · European Russia UB0SMX · Asiatic Russia UD7G · European Russia YL3CW · Latvia

Most frequent locator attributed to JA5ICH

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 · 17 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,565 km (approx.)
Last such locator decoded: 2026-07-21 20:17 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	JA5ICH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 19:55	80m	- / -13	YL3CW	-5 / -	2	✓ Closing fragment
09-20 19:48	80m	- / -18	OZ1ADL	+4 / -	3	Partial capture
08-17 20:28	20m	- / -	EI9IB	-5 / -	3	Partial capture
08-11 19:56	20m	- / -14	EA1B	+2 / -	2	✓ Closing fragment
08-04 20:01	60m	- / -	DM2RM	-6 / -	4	Partial capture
07-26 20:33	20m	- / -	IW9FRA	-18 / -	6	Partial capture
07-26 20:30	20m	- / -16	CR7BRV	-4 / -	2	✓ Closing fragment
07-26 20:08	20m	- / -	IZ2MZL	+3 / -	2	Partial capture
07-21 20:17	20m	-13 / -	TU5MM	- / -	2	Partial capture
07-13 19:51	80m	- / -	RO2X	0 / -	2	Partial capture
07-13 19:43	80m	- / -17	UD7G	+1 / -	4	✓ Closing fragment
07-13 19:39	80m	- / -	RO2X	-8 / -	2	Partial capture
07-13 19:26	80m	- / -24	RW4F	-3 / -	3	✓ Closing fragment
07-13 19:25	80m	- / -22	UA3PY	+13 / -	2	✓ Closing fragment
07-13 19:23	80m	- / -4	UB0SMX	-10 / -	2	✓ Closing fragment
06-29 19:38	20m	- / -20	<...>	+7 / -	3	✓ Closing fragment
06-29 19:30	20m	- / -15	DF7BN	-4 / -	3	Partial capture
06-29 19:24	20m	- / -	G4DBW	+1 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
192700  -5 1637  JA5ICH RW4F R-24 (x2)
193900  -8 2441  JA5ICH RO2X KO74 (x2)
194345  +0  577  JA5ICH UD7G -17 (x4)
195100  +0 2443  JA5ICH RO2X KO74 (x2)
194845  +3  955  JA5ICH OZ1ADL -18 (x3)
195515  -5 2398  JA5ICH YL3CW -13 (x2)

20m

UTC    dB Audio  Message
200900  +5 2678  JA5ICH IZ2MZL JN45
203045  -4  663  JA5ICH CR7BRV -16 (x2)
203315 -21 2064  JA5ICH IW9FRA JM68 (x6)
195615  +0 2564  JA5ICH EA1B -14 (x2)
202830  -2 1793  JA5ICH EI9IB IO63
202830 -12 2060  JA5ICH CT7AGM 73
202900  -6 1793  JA5ICH EI9IB IO63 (x2)

60m

UTC    dB Audio  Message
200100  -7 2147  JA5ICH DM2RM JO63 (x4)

40m

UTC    dB Audio  Message
190245 -18 1827  JA5ICH G4DBW JO01

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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