YO3DIU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Romania Most frequent locator attributed to this token: KN34

Receiver-side FT8 activity involving YO3DIU, decoded by SO8OO in southeastern Poland. 215 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-18.

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 215 FT8 messages attributed to YO3DIU 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 (56%), followed by 80 m (39%) and 40 m (5%). Most decodes (52%) fell within the six-hour window 07:00-13:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (64%); the estimated median was +2.9 dB.

Overview

215

Messages attributed

UTC dates decoded

Active 15-min windows

+2.9 dB

Estimated median S/N

Bands

80m · 83 40m · 11 20m · 121

First attributed message: 2026-06-08
Last attributed message: 2026-09-18 00:44 UTC

Observed FT8 message patterns

Attributed sample: 215 messages
Active dates: 5 UTC dates
Estimated median S/N: +2.9 dB
Estimated 10th-90th percentile: -21 to +13 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 63, moderate (-15 to -9 dB) 14, strong (≥ -8 dB) 138.

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 YO3DIU in decoded directed-looking exchanges:

F1PBZ · France ×2 R2BMP · European Russia ×2 F5LPL · France IK1AQI · Italy OS4K · Belgium PA2PAT · Netherlands PD0HLA · Netherlands PH7KLM · Netherlands RY9W · Asiatic Russia UA4FFZ · European Russia UA6HRB · European Russia UR7VU · Ukraine

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to YO3DIU

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: KN34 · 121 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 721 km (approx.)
Last such locator decoded: 2026-09-18 00:43 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	YO3DIU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-18 00:43	80m	+14 / -1	RA3ZGT	+2 / +5	5	✓ Full exchange observed
09-18 00:39	80m	+14 / -	DO5PY	-9 / -16	11	✓ Closing observed
09-18 00:36	80m	+14 / -	AP2HA	- / -	4	Partial capture
09-18 00:34	80m	+14 / -6	F1PBZ	+6 / -3	7	✓ Full exchange observed
09-18 00:34	80m	+6 / +2	US1EA	+8 / +1	7	✓ Full exchange observed
09-18 00:31	80m	+3 / -20	EX7DY	-8 / -8	7	✓ Full exchange observed
09-18 00:26	80m	+12 / -	ON4MAP	- / -19	2	✓ Closing fragment
09-18 00:26	80m	+5 / -	DL9KM	-1 / -7	10	Partial capture
09-18 00:25	80m	+12 / -8	ON1JP	-10 / -20	4	✓ Full exchange observed
09-18 00:18	80m	+12 / -11	9A2TN	+14 / 0	5	✓ Full exchange observed
09-18 00:14	80m	+10 / -10	UA3ATQ	-3 / -7	6	✓ Full exchange observed
09-18 00:13	80m	+9 / -8	ON3MOH	-4 / -13	4	✓ Full exchange observed
09-18 00:12	80m	+14 / -	EX7DY	- / -	2	Partial capture
09-18 00:11	80m	- / -	F1IQH	-14 / -	3	Partial capture
09-18 00:07	80m	+13 / -	DL4KSD	-6 / -2	6	✓ Closing observed
09-18 00:07	80m	+12 / -	EX7DY	- / -	2	Partial capture
09-18 00:07	80m	+13 / -16	DO8JB	-15 / -17	7	✓ Full exchange observed
09-18 00:04	80m	+11 / -5	IQ0AAI	-6 / -14	6	✓ Full exchange observed
09-08 22:59	80m	+6 / -14	M0IOY	-5 / -13	4	✓ Full exchange observed
09-08 22:58	80m	- / -4	R5AV	+7 / -	3	Partial capture
09-08 22:58	80m	- / -10	F1PBZ	+8 / -	2	Partial capture
09-08 22:56	80m	+7 / -	SP7ENZ	- / -14	2	✓ Closing fragment
09-08 22:56	80m	- / -	DL9KM	-10 / -	5	Partial capture
09-08 22:54	80m	+10 / -	UA4FKT	- / -2	3	Partial capture
09-08 22:52	80m	+10 / -9	UN9LEI	-12 / -15	4	✓ Full exchange observed
09-08 22:50	80m	+8 / -8	DA6OOM	-8 / -	4	✓ Closing observed
09-08 22:50	80m	+10 / -	G8OO	-1 / -7	10	✓ Closing observed
09-08 22:48	80m	+13 / -	Z62NS	+18 / -	3	✓ Closing observed
09-08 18:20	40m	- / -	M9PCA	-6 / -	4	Partial capture
09-08 18:18	40m	- / -15	F1PBZ	-5 / -	3	Partial capture
07-31 17:10	20m	- / +8	DL6KA	-5 / -	5	Partial capture
07-31 17:09	20m	- / -14	F1PBZ	-4 / -	2	✓ Closing fragment
07-02 12:37	20m	-14 / -	OS4K	- / -4	2	✓ Closing fragment
07-02 12:36	20m	-16 / -	PH7KLM	- / -	2	✓ Closing fragment
07-02 12:32	20m	-18 / -	DG7CF	- / -15	2	Partial capture
07-02 12:29	20m	-19 / -	UA4FFZ	- / -18	2	✓ Closing fragment
07-02 09:34	20m	- / -15	DK5UP	-9 / -	2	Partial capture
07-02 09:19	20m	-22 / -	R2BMP	- / -13	4	✓ Closing fragment
07-02 09:18	20m	- / +5	UA6HRB	-14 / -	2	✓ Closing fragment
07-02 09:08	20m	-23 / -	F5DGQ	- / -19	2	Partial capture
07-02 09:00	20m	-16 / -	YO8RSL	- / -16	3	✓ Closing fragment
07-02 08:59	20m	-19 / -2	TM2WWA	-20 / -3	2	Partial capture
07-02 08:56	20m	-16 / -19	PA2PAT	-23 / -12	6	✓ Full exchange observed
07-02 08:51	20m	-19 / -	UR7VU	- / -11	2	✓ Closing fragment
07-02 08:50	20m	-21 / -	IK1AQI	-14 / -	2	✓ Closing observed
07-02 08:36	20m	-18 / -	9Y4C	- / -	17	Partial capture
07-02 08:26	20m	-22 / -	RY9W	- / -16	2	✓ Closing fragment
07-02 08:11	20m	-24 / -	ON1JP	- / -16	2	Partial capture
07-02 08:07	20m	-21 / -	R3KJF	- / -4	3	Partial capture
07-02 08:01	20m	- / -18	F5LPL	-13 / -	7	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
004000 -10  984  YO3DIU DO5PY JN49
004015 +15  984  DO5PY YO3DIU -17
004030 -11  984  YO3DIU DO5PY JN49
004045 +15  984  DO5PY YO3DIU -16
004100  -6  984  YO3DIU DO5PY JN49
004115 +15  984  DO5PY YO3DIU -17
004130  -5  984  YO3DIU DO5PY JN49
004145 +11  985  DO5PY YO3DIU -16 (x2)
004315 +14  985  CQ YO3DIU KN34
004330  +5  985  YO3DIU RA3ZGT KO81
004345 +13  984  RA3ZGT YO3DIU +05
004400  +0  984  YO3DIU RA3ZGT R-01
004415 +16  985  RA3ZGT YO3DIU RR73
004430  +0  985  YO3DIU RA3ZGT 73

40m

UTC    dB Audio  Message
181845  -6 2689  YO3DIU F1PBZ -15
181900  +6  881  CQ YO3DIU KN34
181915  -4 2689  YO3DIU F1PBZ -15
181930 +11  881  CQ YO3DIU KN34 (x3)
182045  -6  881  YO3DIU M9PCA JO02
182100  +0  881  CQ YO3DIU KN34
182115  -8  881  YO3DIU M9PCA JO02
182130  +4  881  CQ YO3DIU KN34
182145  -2  881  YO3DIU M9PCA JO02
182200  +1  881  CQ YO3DIU KN34
182215  -6  881  YO3DIU M9PCA JO02
182230  +4  881  CQ YO3DIU KN34 (x2)

20m

UTC    dB Audio  Message
123715 -13 1830  OS4K YO3DIU R-04 (x2)
123915 -15 1830  CQ YO3DIU KN34 (x5)
170930  -4 2671  YO3DIU F1PBZ -14
170945 -18 1830  CQ YO3DIU KN34
171030  -4 2671  YO3DIU F1PBZ RR73
171030  -5  630  YO3DIU DL6KA +08 (x5)

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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