RU3XK — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KO73

Receiver-side FT8 activity involving RU3XK, decoded by SO8OO in southeastern Poland. 2,647 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 33 UTC dates in the available aggregate history. Observed between 2026-07-22 and 2026-10-09.

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 2,647 FT8 messages attributed to RU3XK as the transmitting token by decoded message structure across 33 UTC dates in the available aggregate history. The largest monitored-band total was 160 m (49%), followed by 80 m (36%) and 40 m (7%). Most decodes (80%) fell within the six-hour window 16:00-22:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (75%); the estimated median was -3.2 dB.

Overview

2,647

Messages attributed

UTC dates decoded

191

Active 15-min windows

-3.2 dB

Estimated median S/N

Bands

160m · 1,294 80m · 966 40m · 180 20m · 50 10m · 157

First attributed message: 2026-07-22
Last attributed message: 2026-10-09 16:26 UTC

Observed FT8 message patterns

Attributed sample: 2,647 messages
Active dates: 33 UTC dates
Estimated median S/N: -3.2 dB
Estimated 10th-90th percentile: -14.3 to +4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 202, moderate (-15 to -9 dB) 472, strong (≥ -8 dB) 1,973.

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 RU3XK in decoded directed-looking exchanges:

DL9KM · Fed. Rep. of Germany ×3 R5AV · European Russia ×3 RA3X · European Russia ×3 RI1FJZ · Franz Josef Land ×3 R3PLA · European Russia ×2 OM2WW · Slovak Republic ×2 R2DRE · European Russia ×2 R4FDD · European Russia ×2 RD7O · European Russia ×2 RK3YWA · European Russia ×2 RM5F · European Russia ×2 ON1JP · Belgium ×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 RU3XK

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: KO73 · 1,967 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 990 km (approx.)
Last such locator decoded: 2026-10-09 16:26 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	RU3XK S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-09 16:21	80m	+3 / +2	BD8CS	-6 / -	15	✓ Closing observed
10-09 16:09	80m	+4 / -	F5OYA/P	- / -	12	Partial capture
10-09 15:58	80m	- / -5	R6ZB	-7 / -	3	✓ Closing fragment
10-09 15:49	80m	+5 / -15	RK0SC	-15 / -	17	Partial capture
10-09 15:48	80m	- / -	UA3UGW	-2 / -	2	Partial capture
10-09 15:47	80m	+5 / -5	DL5WP	+10 / -10	4	✓ Full exchange observed
10-09 15:39	80m	- / -	F4GVO	-4 / -	4	Partial capture
10-07 18:19	160m	+4 / -24	OM2WW	+8 / -11	5	✓ Full exchange observed
10-07 18:15	160m	-2 / -10	EI8IQ	-12 / -20	10	✓ Full exchange observed
10-07 18:10	160m	-14 / -11	SM2LKW	-14 / -18	5	Partial capture
10-07 18:02	160m	-10 / -19	DA6SHO	+1 / -20	8	✓ Full exchange observed
10-07 17:59	160m	-9 / -	UC1C	- / -22	2	Partial capture
10-07 17:53	160m	-12 / -5	8S2C	-18 / -22	4	✓ Full exchange observed
10-07 17:44	160m	-5 / 0	DL7UKM	-19 / -17	5	✓ Full exchange observed
10-07 17:41	160m	-6 / -1	RY3K	+8 / +5	4	✓ Full exchange observed
10-07 17:38	160m	-4 / -	RA3WPF	- / -13	2	✓ Closing fragment
10-07 17:33	160m	-9 / -	RA3V	- / -8	2	✓ Closing fragment
10-07 17:30	160m	-8 / -1	OM3WBY	+4 / -3	5	✓ Full exchange observed
10-07 17:28	160m	- / -	DL7UKM	-22 / -	2	Partial capture
10-07 17:23	160m	-10 / -	OM7CF	+8 / -1	5	✓ Full exchange observed
10-07 17:21	160m	-8 / -6	DL9FCY	+12 / -12	5	✓ Full exchange observed
10-07 17:18	160m	-6 / -20	SV3GKU	+6 / -2	5	✓ Full exchange observed
10-07 17:14	160m	-1 / -	UN7LAN	- / -19	5	Partial capture
10-07 17:11	160m	-10 / -10	SV8DCY	-10 / -10	5	✓ Full exchange observed
10-07 17:11	160m	-8 / +5	R5AV	-12 / -5	4	✓ Full exchange observed
09-30 19:36	160m	-5 / -	JA7JPZ	- / -	8	Partial capture
09-30 18:32	160m	- / -	IK6GPZ	-6 / -	2	Partial capture
09-30 18:31	160m	-6 / -	C37AC	- / -	5	Partial capture
09-30 18:28	160m	-4 / -8	SP3NGI	-11 / -	3	✓ Closing observed
09-30 18:20	160m	-11 / -13	LA9JKA	-24 / -	4	✓ Closing observed
09-30 18:18	160m	-6 / -	R6OI	- / -6	2	✓ Closing fragment
09-30 18:08	160m	-6 / -	OD5XX	- / -	12	Partial capture
09-30 16:30	80m	-8 / -7	RA3PS	-24 / -14	4	✓ Full exchange observed
09-30 16:12	80m	-6 / -3	R3PY	-10 / -	3	✓ Closing observed
09-30 16:04	80m	-2 / -	BA4RF	- / -16	2	✓ Closing fragment
09-30 16:01	80m	-5 / -1	RW3DBX	-8 / +4	5	✓ Full exchange observed
09-30 15:53	80m	-10 / -	R9MBC	- / -19	3	✓ Closing fragment
09-30 15:47	80m	-4 / -	RA3ZOM	- / +6	2	✓ Closing fragment
09-30 15:43	80m	0 / -4	RG6OR	-17 / -	2	✓ Closing observed
09-30 15:35	80m	-2 / -1	R4HHN	-9 / 0	4	✓ Full exchange observed
09-27 18:23	160m	- / -12	DL5CK	-7 / -	5	Partial capture
09-27 18:15	160m	+6 / -16	IK6GPZ	-1 / -18	7	✓ Full exchange observed
09-27 18:09	160m	-3 / -	R4FDD	-20 / -6	3	✓ Closing observed
09-27 18:07	160m	+2 / -	R3DGH	- / -20	2	✓ Closing fragment
09-27 18:05	160m	- / -	F8IPH	-20 / -	5	Partial capture
09-27 18:02	160m	+2 / -	R2HB	-10 / +2	4	✓ Full exchange observed
09-27 17:59	160m	+1 / -	R70SAB	-11 / -11	4	✓ Closing observed
09-27 17:55	160m	0 / 0	RA3X	-17 / -	5	✓ Full exchange observed
09-27 17:53	160m	+8 / 0	SP4LIN	+9 / -8	6	✓ Full exchange observed
09-27 17:47	160m	+8 / -10	R0QBB/3	-3 / -2	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
162145  +5 1220  BD8CS RU3XK KO73 (x11)
162700  -3 2673  RU3XK BD8CS +02 (x4)

160m

UTC    dB Audio  Message
181600  -4 1848  EI8IQ RU3XK KO73 (x3)
181715 -11  331  RU3XK EI8IQ -10
181730  +1 1848  EI8IQ RU3XK R-13
181745 -14  331  RU3XK EI8IQ RR73
181800  -2 1848  EI8IQ RU3XK R-13 (x2)
181915  +4 1156  RU3XK OM2WW JN88
181930  +4 1848  OM2WW RU3XK -11
181945  +9 1156  RU3XK OM2WW R-24
182000  +3 1848  OM2WW RU3XK RR73
182115 +11 1156  RU3XK OM2WW 73
182130  -3 1848  CQ RU3XK KO73 (x2)

40m

UTC    dB Audio  Message
053845  -9 2279  RI1FJZ RU3XK KO73 (x15)

20m

UTC    dB Audio  Message
040630  +4 1769  RU3XK RV6F LN14 (x3)
040745 -17 1200  RU3XK K2TQC +00
040800  -3 1769  RU3XK RV6F LN14
040815 -15 1200  RU3XK K2TQC RR73
040830  -2 1769  RU3XK RV6F LN14
041245 +11 1014  RU3XK RA6FC LN13 (x4)
042245  -8 2879  RU3XK RO6G -07 (x3)
183115  -7 2245  RI1FJL RU3XK R-04

10m

UTC    dB Audio  Message
190615 -15 2152  RU3XK HG1DRC JN86 (x2)
190715  -4  660  RU3XK DH6DAO JO41
190815 -15 2153  RU3XK HG1DRC R-07
190845  +1 2152  RU3XK DH6DAO JO41
190845 -17 1277  RU3XK DF7EE JO40
190915  -1 2152  RU3XK DH6DAO JO41
190915 -12 1277  RU3XK DF7EE JO40
190945  +0 2153  RU3XK DH6DAO R+19
190945 -12 1277  RU3XK DF7EE JO40
191015  +2 2153  RU3XK DH6DAO 73
191045 -17 1276  RU3XK DF7EE JO40
160100 -11  647  RU3XK R6DWD -22 (x3)

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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