IU4DBU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Italy Most frequent locator attributed to this token: JN64

Receiver-side FT8 activity involving IU4DBU, decoded by SO8OO in southeastern Poland. 38 FT8 messages attributed to this token as transmitter, on 40m, across 1 UTC dates in the available aggregate history. Last observed 2026-08-26.

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 38 FT8 messages attributed to IU4DBU as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -5 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-5 dB

Estimated median S/N

Bands

40m · 38

First attributed message: 2026-08-26
Last attributed message: 2026-08-26 16:34 UTC

Observed FT8 message patterns

Attributed sample: 38 messages
Active dates: 1 UTC dates
Estimated median S/N: -5 dB
Estimated 10th-90th percentile: -12 to +1 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 6, strong (≥ -8 dB) 32.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with IU4DBU in decoded directed-looking exchanges:

9A4ZM · Croatia DL3KVR · Fed. Rep. of Germany F5PAC · France F5SYF · France HB9HKJ · Switzerland PD2MAC · Netherlands SP2SGZ · Poland UI6O · European Russia

Most frequent locator attributed to IU4DBU

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: JN64 · 14 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 897 km (approx.)
Last such locator decoded: 2026-08-26 16:29 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	IU4DBU S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-26 16:33	40m	-9 / -9	F5PAC	-6 / -	3	✓ Closing observed
08-26 16:29	40m	-8 / -	UI6O	- / -3	4	✓ Closing fragment
08-26 16:27	40m	-1 / -	PD7PIN	- / -	3	Partial capture
08-26 16:21	40m	-8 / -	HA3FIC	-2 / -	3	Partial capture
08-26 16:17	40m	-4 / +4	9A4ZM	-1 / -4	7	✓ Full exchange observed
08-26 16:15	40m	-9 / -	PA3AGN	- / -	2	Partial capture
08-26 16:11	40m	-11 / -	F5SYF	- / -	3	✓ Closing fragment
08-26 16:04	40m	-6 / -	9A4ZM	+9 / -	9	Partial capture
08-26 16:02	40m	0 / -6	PD2MAC	-13 / -6	4	✓ Full exchange observed
08-26 15:54	40m	-5 / -	HB9HKJ	- / -	4	Partial capture
08-26 15:50	40m	-3 / -	EA4GA	- / +10	4	Partial capture
08-26 15:46	40m	0 / -	EA4GA	- / -	2	Partial capture
08-26 15:31	40m	- / -24	SP2SGZ	+1 / -	3	✓ Closing fragment
08-26 15:27	40m	- / -	DL3KVR	0 / -	2	✓ Closing fragment
08-26 15:24	40m	- / -19	DL3KVR	+4 / -	2	Partial capture
08-26 15:17	20m	- / -	F1PPH	+1 / -	2	Partial capture
08-26 15:07	20m	- / -	F4JZW	+4 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
161930  +0 1290  IU4DBU 9A4ZM 73
162130  -8 1303  HA3FIC IU4DBU JN64 (x2)
162245  -2 1304  IU4DBU HA3FIC JN96
162700  +0  937  PD7PIN IU4DBU JN64 (x3)
162945  -5 1139  UI6O IU4DBU JN64 (x4)
163300  -7 1702  IU4DBU LY2KM -03
163315  -7 1050  IU4DBU F5PAC -09 (x2)
163400  -9 1049  F5PAC IU4DBU 73

20m

UTC    dB Audio  Message
150745  +8 1978  IU4DBU F4JZW JN08 (x2)
151715  +4  281  IU4DBU F1PPH JN07 (x3)

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