R3UDU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO07

Receiver-side FT8 activity involving R3UDU, decoded by SO8OO in southeastern Poland. 528 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 22 UTC dates in the available aggregate history. Observed between 2026-08-16 and 2026-09-15.

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 528 FT8 messages attributed to R3UDU as the transmitting token by decoded message structure across 22 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (65%), followed by 20 m (35%). Most decodes (72%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

528

Messages attributed

UTC dates decoded

109

Active 15-min windows

-14 dB

Estimated median S/N

Bands

40m · 342 20m · 186

First attributed message: 2026-08-16
Last attributed message: 2026-09-15 17:15 UTC

Observed FT8 message patterns

Attributed sample: 528 messages
Active dates: 22 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -21 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 207, moderate (-15 to -9 dB) 188, strong (≥ -8 dB) 133.

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 R3UDU in decoded directed-looking exchanges:

R6ZB · European Russia ×3 F5RRS · France ×2 ON1AJ · Belgium ×2 ON4AOI · Belgium ×2 OZ9FF · Denmark ×2 R7CD · European Russia ×2 EW8AAC · Belarus ×2 G6LEE · England ×2 PA3EWP · Netherlands ×2 RM6OS · European Russia ×2 RV3OC · European Russia ×2 UB1CBC · European Russia ×2

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 R3UDU

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: LO07 · 322 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,510 km (approx.)
Last such locator decoded: 2026-09-15 17:15 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	R3UDU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 17:15	40m	- / -16	EU6AV	-8 / -	7	✓ Closing fragment
09-15 17:09	40m	-20 / -	R6ZB	- / -9	3	✓ Closing fragment
09-15 16:57	40m	-14 / -	YO4AAC	- / -13	2	Partial capture
09-15 16:52	40m	-14 / -8	ER1CW	-1 / -	4	Partial capture
09-15 16:49	40m	- / -1	YO4AAC	-5 / -	7	✓ Closing fragment
09-15 16:43	40m	- / -14	LZ936BA	0 / -	3	Partial capture
09-15 16:34	40m	- / -4	UD8D	-14 / -	2	✓ Closing fragment
09-14 17:25	40m	-16 / -1	RU3QR	-4 / -	4	✓ Closing observed
09-14 16:50	40m	-11 / -	SN40KZE	+7 / -	2	Partial capture
09-14 16:30	40m	- / -13	R9OOF	-1 / -	2	✓ Closing fragment
09-14 16:24	40m	-18 / -11	LZ1FBI	-1 / -	10	✓ Closing observed
09-14 16:13	40m	-14 / -10	RQ6B	-10 / -	2	Partial capture
09-14 16:06	40m	- / -	R4ML	+2 / -	3	Partial capture
09-14 16:05	40m	- / -	DL7ACA	-2 / -	2	Partial capture
09-14 16:03	40m	- / -	DL6UM	+6 / -	3	Partial capture
09-14 16:01	40m	-22 / -	R3RB	- / +4	2	✓ Closing fragment
09-14 15:25	40m	-21 / -	UN3P	- / -	2	Partial capture
09-14 15:23	40m	-9 / 0	RW6AU	-8 / -	5	✓ Closing observed
09-14 15:18	40m	-14 / +2	R4CGS	-15 / +2	5	✓ Full exchange observed
09-14 15:14	40m	-19 / -	RT1I	- / -2	2	Partial capture
09-14 15:04	40m	- / +8	RW3PI	-6 / -	2	Partial capture
09-14 14:59	40m	- / -3	RA6AR	-10 / -	2	Partial capture
09-14 14:55	40m	-21 / 0	RZ9A	-19 / -2	4	✓ Full exchange observed
09-14 14:45	40m	- / +1	RA3DFQ	-2 / -	2	✓ Closing fragment
09-14 14:42	40m	-19 / -	UB4HVI	- / -12	2	Partial capture
09-13 18:49	40m	- / -	DL7UKM	-2 / -	4	Partial capture
09-13 18:38	40m	-7 / -	OZ1A	-8 / -15	5	✓ Closing observed
09-13 18:30	40m	- / -5	DF9HT/P	-9 / -	10	Partial capture
09-12 20:20	40m	-8 / -6	E75C	-3 / -	7	✓ Closing observed
09-12 20:17	40m	-12 / -	TA2EE	- / -11	2	Partial capture
09-12 20:13	40m	-13 / -9	F4JDM	-2 / -14	6	✓ Full exchange observed
09-12 20:04	40m	-14 / -7	PA4CC	+11 / +3	3	✓ Full exchange observed
09-12 16:54	40m	- / -	DJ0MAB	-5 / -	3	Partial capture
09-12 16:53	40m	-24 / +4	RG6ZF	-14 / -3	3	✓ Full exchange observed
09-12 16:37	40m	-12 / 0	PA3EWP	-5 / -11	8	✓ Full exchange observed
09-11 21:16	40m	-14 / -	F4JDM	- / -	2	Partial capture
09-11 18:07	40m	-14 / -	R2YW	-7 / -14	2	✓ Closing observed
09-11 18:01	40m	- / +8	OH5KNL	-8 / -	2	Partial capture
09-11 17:53	40m	- / -7	DK0ND	+1 / -	5	Partial capture
09-11 17:49	40m	- / -16	RA3LBW	+3 / -	3	✓ Closing fragment
09-11 17:46	40m	-11 / -	HG8LXL	-22 / +5	2	Partial capture
09-11 17:42	40m	- / -17	E70SZ	+1 / -	8	Partial capture
09-11 17:33	40m	- / -9	RA4AID	-12 / -	3	✓ Closing fragment
09-11 17:28	40m	- / +2	SQ2GXO	-4 / -	2	✓ Closing fragment
09-10 17:36	40m	-13 / -5	RX9ABI	-2 / -	3	✓ Closing observed
09-10 17:23	40m	-11 / -18	R3UCQ	-4 / -13	4	✓ Full exchange observed
09-10 17:12	40m	- / -10	UB0AMB	-10 / -	2	✓ Closing fragment
09-10 17:07	40m	-7 / -10	DL6NDN	+5 / -9	3	✓ Full exchange observed
09-10 17:04	40m	- / -9	2E0FHM	-8 / -	2	Partial capture
09-10 16:59	40m	- / -10	DL4ME	+12 / -	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
165345  -4 2097  R3UDU YO4AAC RR73
165345  +1 2167  R3UDU ER1CW -08
165700 -15 2095  YO4AAC R3UDU LO07 (x2)
170930 -20 1641  R6ZB R3UDU LO07 (x3)
171530  -7 1675  R3UDU EU6AV -16
171545  -5 2716  EM90ZMV R3UDU LO07
171600 -10 1675  R3UDU EU6AV -16 (x6)

20m

UTC    dB Audio  Message
155730 -15 1807  R3UDU TA3STR KM39
155745  -4 1807  TA3STR R3UDU -17 (x2)
155830 -16 1805  R3UDU TA3STR -16
155845 -11 1806  TA3STR R3UDU R-14
155900 -18 1807  R3UDU TA3STR RR73
155915  -7 1807  CQ R3UDU LO07
155930  -3 2215  R3UDU IQ4JO JN63
155945 -10 1806  IQ4JO R3UDU -14
160000  +7 2215  R3UDU IQ4JO R-09
160015  -6 1806  CQ R3UDU LO07 (x2)
160100  +4 2215  R3UDU IQ4JO R-09
160115  -3 1806  CQ R3UDU LO07 (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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