RU4F — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO23

Receiver-side FT8 activity involving RU4F, decoded by SO8OO in southeastern Poland. 535 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 28 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-09-14.

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 535 FT8 messages attributed to RU4F as the transmitting token by decoded message structure across 28 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (66%), followed by 20 m (19%) and 40 m (15%). Most decodes (93%) fell within the six-hour window 15:00-21:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (76%); the estimated median was -2 dB.

Overview

535

Messages attributed

UTC dates decoded

Active 15-min windows

-2 dB

Estimated median S/N

Bands

80m · 352 40m · 80 20m · 103

First attributed message: 2026-06-17
Last attributed message: 2026-09-14 16:18 UTC

Observed FT8 message patterns

Attributed sample: 535 messages
Active dates: 28 UTC dates
Estimated median S/N: -2 dB
Estimated 10th-90th percentile: -13 to +7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 22, moderate (-15 to -9 dB) 107, strong (≥ -8 dB) 406.

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 RU4F in decoded directed-looking exchanges:

RX7O · European Russia ×2 R9TS · Asiatic Russia ×2 TN8GD · Republic of the Congo ×2 R4PFY · European Russia ×2 RI1PC · European Russia ×2 S59A · Slovenia ×2 SV2AEL · Greece ×2 T22TT · Tuvalu ×2 RD7X · European Russia ×2 RI0FA · Asiatic Russia ×2 R6JY · European Russia A61QQ · United Arab Emirates

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 RU4F

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: LO23 · 190 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,639 km (approx.)
Last such locator decoded: 2026-09-14 16:18 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	RU4F S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-14 16:15	80m	-15 / -	KH8WW	- / -	4	Partial capture
09-14 16:08	80m	-10 / -	KH8WW	- / -	5	Partial capture
09-14 15:55	80m	-10 / -	KH8WW	- / -	9	Partial capture
09-14 15:36	80m	+1 / -	KH8WW	- / -	20	Partial capture
09-14 15:32	80m	0 / -	KH8WW	- / -	2	Partial capture
09-14 15:14	80m	-7 / -	KH8WW	- / -	8	Partial capture
09-14 15:06	80m	-16 / -	KH8WW	- / -4	8	Partial capture
09-11 18:45	80m	-12 / -6	RC2Y	+3 / -6	6	✓ Full exchange observed
09-11 18:42	80m	-7 / -	R0QBB/3	- / -8	3	Partial capture
09-06 16:24	80m	- / -10	UI4I	-12 / -	4	✓ Closing fragment
09-06 16:21	80m	-8 / -	UA4QK	-12 / -8	4	✓ Closing observed
09-06 16:14	80m	-2 / -7	R3YK	-1 / -13	3	✓ Full exchange observed
09-06 16:12	80m	-7 / -3	R6ZCE	-5 / -	3	✓ Closing observed
09-06 16:08	80m	- / 0	RM3ZR	-2 / -	3	✓ Closing fragment
09-06 16:05	80m	-6 / -	RA4FP	+2 / +1	5	✓ Full exchange observed
09-01 17:55	80m	-2 / -	P29YY	- / -	2	Partial capture
09-01 17:43	80m	-10 / -	5W1SA	- / -7	4	✓ Closing fragment
08-30 18:22	80m	+8 / -11	HB0WR	-5 / -19	4	✓ Full exchange observed
08-30 18:20	80m	-2 / -	RQ3D	-20 / -9	3	✓ Closing observed
08-30 18:18	80m	+5 / -	RW0LT	-24 / -9	4	✓ Closing observed
08-30 18:16	80m	+4 / -	EX8BT	- / -4	2	✓ Closing fragment
08-30 18:13	80m	+10 / -	F4GTB	- / -13	2	Partial capture
08-30 18:10	80m	+3 / -	RM6OS	+9 / -3	4	✓ Full exchange observed
08-30 18:03	80m	+4 / -	9V1YC	- / -	2	Partial capture
08-28 16:38	40m	-12 / -7	II7MGXX	-6 / -10	2	Partial capture
08-28 16:35	40m	-12 / -	UA9FLJ	- / -10	2	Partial capture
08-28 16:29	40m	-12 / +8	RU6FS	-11 / -3	3	✓ Full exchange observed
08-28 16:28	40m	-10 / -5	RA3WEO	-2 / -9	4	✓ Full exchange observed
08-28 16:28	40m	-12 / -3	RO7F	-5 / -2	2	Partial capture
08-28 16:26	40m	-10 / -16	UA9FMT	-10 / -3	3	✓ Full exchange observed
08-28 16:25	40m	-6 / -	BG0HP	-16 / -11	3	✓ Closing observed
08-28 16:24	40m	-13 / -6	OH2ZZ	-10 / -	3	✓ Closing observed
08-28 16:23	40m	-12 / -2	R2APC	-8 / -1	4	✓ Full exchange observed
08-28 16:21	40m	-14 / -6	R3WDW	+1 / -3	4	✓ Full exchange observed
08-28 16:20	40m	-14 / -11	R4PFY	-12 / -9	4	✓ Full exchange observed
08-27 19:28	80m	+7 / -	RD0L	- / -15	3	✓ Closing fragment
08-27 19:18	80m	+6 / -	RA9SBN	- / -8	2	✓ Closing fragment
08-27 19:17	80m	- / -5	UN8DSW	-18 / -	2	✓ Closing fragment
08-27 19:14	80m	-4 / -5	UA3RCW	-3 / -9	3	✓ Full exchange observed
08-27 19:13	80m	- / -7	R7CD	+12 / -	2	✓ Closing fragment
08-27 19:06	80m	+4 / -	RI1FJL	- / -14	2	Partial capture
08-26 18:30	80m	-12 / -	RI1FJL	- / -	2	Partial capture
08-26 18:15	80m	+1 / -	RI1FJL	- / -12	10	Partial capture
08-25 18:09	80m	0 / -	RA9CUU	- / -7	2	✓ Closing fragment
08-25 18:08	80m	-2 / +1	RC6OZ	-9 / -9	5	✓ Full exchange observed
08-25 18:07	80m	-2 / -	RA4FHO	-1 / +1	3	✓ Closing observed
08-25 18:04	80m	-5 / -3	RA3M	-10 / 0	5	✓ Full exchange observed
08-25 18:03	80m	-6 / -11	OK1FRG	+11 / -19	15	Partial capture
08-25 18:02	80m	-8 / +7	R5KH	-20 / -6	7	✓ Full exchange observed
08-25 17:59	80m	-4 / -	R7LB	-6 / -18	8	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
155715  -7  872  KH8WW RU4F LO23 (x15)

160m

UTC    dB Audio  Message
025830 -14  825  RU4F UA4FKT LO23

40m

UTC    dB Audio  Message
162900  -1 2529  RU4F RA3WEO R-05
162915 -11 2467  RA3WEO RU4F RR73
162930  -4 2528  RU4F RA3WEO 73
162945 -12 2467  RU6FS RU4F -03
163000 -11 1887  RU4F RU6FS R+08
163015 -12 2467  RU6FS RU4F RR73
163115 -15 2467  R3PA RU4F RR73
163530 -15 2467  UA9FLJ RU4F -10 (x2)
163700  -9 2467  R6DZD RU4F -03
163730 -13 2467  UB0SMX/P RU4F -08
163800 -14 2467  RA9FUE RU4F -06
163830 -12 2467  <II7MGXX> RU4F -10
163930 -10 2467  UN2NC RU4F RR73
163945  -6 1154  RU4F II7MGXX R-07

20m

UTC    dB Audio  Message
192345 -11 2443  DL70ESSEN RU4F -07
192445 -12 2443  TM0BSM RU4F -16
192515 -10 2443  BG7BMG RU4F -11 (x4)
192915 -10 2443  BG7BVI RU4F 73
193100  -9 2443  JI4POR RU4F RR73
165045  -6 2544  RA3RFT/1 RU4F -14
165115  -5 2544  C91RU RU4F LO23 (x6)

10m

UTC    dB Audio  Message
182900  +2 2871  RU4F D44EC -17 (x2)
183200  -1 2872  RU4F RR73; R3HH <...> -12 (x2)
190345 -14 1068  RU4F UI6L KN97 (x2)
190800  -2 2962  RU4F RX7O R-16 (x2)
191600  -2 2035  RU4F R6JY R-13 (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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