RU4AJ — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO00

Receiver-side FT8 activity involving RU4AJ, decoded by SO8OO in southeastern Poland. 550 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 76 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-23.

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 550 FT8 messages attributed to RU4AJ as the transmitting token by decoded message structure across 76 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (39%), followed by 20 m (29%) and 80 m (19%). Most decodes (61%) 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 (72%); the estimated median was -5 dB.

Overview

550

Messages attributed

UTC dates decoded

158

Active 15-min windows

-5 dB

Estimated median S/N

Bands

80m · 107 40m · 212 20m · 160 10m · 71

First attributed message: 2026-06-06
Last attributed message: 2026-10-23 13:48 UTC

Observed FT8 message patterns

Attributed sample: 550 messages
Active dates: 76 UTC dates
Estimated median S/N: -5 dB
Estimated 10th-90th percentile: -12 to +6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 19, moderate (-15 to -9 dB) 134, strong (≥ -8 dB) 397.

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 RU4AJ in decoded directed-looking exchanges:

RA9CUU · Asiatic Russia ×2 LU3HBA · Argentina A41ZZ · Oman EP2AES · Iran ND9M · United States R8CGT · Asiatic Russia RA0CCK · Asiatic Russia RA0S · Asiatic Russia RK0SWA · Asiatic Russia RM5F · European Russia RU6UR · European Russia TA2EE · Asiatic Turkey

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 RU4AJ

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: LO00 · 227 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,364 km (approx.)
Last such locator decoded: 2026-10-23 13:44 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	RU4AJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-23 13:47	40m	-12 / -	RN6DE	-17 / -	2	✓ Closing observed
10-23 13:46	40m	- / -	DK2MAX	-9 / -	9	Partial capture
10-23 13:44	40m	-12 / -	R0BD	- / -7	2	Partial capture
10-22 05:26	40m	-11 / -	TO4A	- / -	2	Partial capture
10-10 17:49	80m	-18 / -6	RT3K	-9 / -4	4	✓ Full exchange observed
10-09 00:58	80m	-2 / -	VU2NKS	- / -20	3	✓ Closing fragment
10-04 14:17	80m	-14 / -	RA9UJ	- / -	2	✓ Closing fragment
10-04 05:03	40m	-10 / -	HK3YL	- / -	3	Partial capture
10-03 15:45	40m	-8 / +4	R7YZ	-10 / -2	6	✓ Full exchange observed
10-03 15:45	40m	-6 / -4	RC6OX	-4 / -4	5	✓ Full exchange observed
10-03 15:44	40m	-8 / +4	R6DZR	-3 / -6	4	✓ Full exchange observed
09-16 20:37	80m	-14 / -	RI1FJZ	- / -	2	Partial capture
09-12 15:55	40m	0 / -5	UB3ADO/P	-10 / -	3	Partial capture
09-12 15:55	40m	+2 / -	R6YG	-4 / -	5	✓ Closing observed
09-12 15:53	40m	0 / -	RW4Z	-14 / -3	3	✓ Closing observed
09-12 15:51	40m	0 / -	UB3ZIL	- / -9	2	✓ Closing fragment
09-12 15:46	40m	-1 / -	RA0AB	- / -18	4	✓ Closing fragment
09-12 15:40	40m	+4 / -	RA9ACA	- / -5	2	✓ Closing fragment
09-12 15:37	40m	+1 / -	R3UCC/P	- / -14	3	✓ Closing fragment
09-12 15:35	40m	-2 / -3	EW8KO	-5 / +1	4	✓ Full exchange observed
09-12 15:33	40m	-2 / -	RA3WEO	+5 / +6	5	✓ Full exchange observed
09-10 16:32	40m	-13 / -	UB0SMX/P	- / -21	3	✓ Closing fragment
09-06 16:31	40m	0 / -	RC2Y	-6 / -3	5	✓ Full exchange observed
09-06 16:30	40m	+6 / -	R2GBR	- / -11	2	✓ Closing fragment
09-06 16:29	40m	+2 / +10	R6ML	+4 / -5	4	✓ Full exchange observed
09-06 16:28	40m	+3 / -	UN9GAM	-12 / -11	4	✓ Closing observed
09-04 20:03	80m	-4 / +2	4L6EZ	-6 / -5	3	Partial capture
09-04 19:13	80m	-13 / -	RA9SOZ	- / -1	2	✓ Closing fragment
09-04 17:15	40m	+4 / -	RI1FJL	- / -17	4	Partial capture
09-03 18:01	80m	+10 / -	UA9LP	- / -	4	Partial capture
09-03 17:52	80m	0 / -	UA9LP	- / -	2	Partial capture
09-03 17:48	80m	+1 / -4	RO7A	+13 / 0	5	✓ Full exchange observed
09-03 17:48	80m	-2 / -1	UA1RC	-19 / -	2	Partial capture
09-02 16:39	40m	-3 / -	RI1FJL	- / -	3	Partial capture
08-31 20:05	40m	-8 / -	R2HB	-14 / -6	4	✓ Closing observed
08-31 04:00	20m	+7 / -	RK0SWA	- / -	4	✓ Closing fragment
08-30 20:00	40m	-2 / -	ER1CW	+5 / -5	4	✓ Closing observed
08-30 19:57	40m	-7 / -5	EW8AAC	-8 / -3	6	✓ Full exchange observed
08-30 19:00	40m	-2 / -	V51WH	- / -	2	Partial capture
08-30 18:58	40m	+2 / -	RA9QBR	- / -3	3	✓ Closing fragment
08-26 05:05	20m	+14 / -	KA3BPN	- / -20	4	Partial capture
08-26 04:55	20m	+15 / -	KD7PCE	- / -	2	Partial capture
08-26 04:53	20m	+14 / -	KM4G	- / -	2	Partial capture
08-26 04:51	20m	+8 / -	AA5GI	- / -	2	Partial capture
08-26 04:48	20m	+8 / -15	EP2AES	-14 / -5	6	✓ Full exchange observed
08-26 04:46	20m	+5 / -	ND9M	- / -16	3	✓ Closing fragment
08-24 12:46	20m	+10 / -	N3NTJ	- / -	2	Partial capture
08-23 19:13	40m	+10 / -	R6UBN	- / -	2	Partial capture
08-23 17:17	40m	+1 / -	RA9DZ	-4 / -	2	✓ Closing observed
08-21 20:28	40m	+7 / -	VK3NX	-16 / -17	5	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
134445 -10  857  R0BD RU4AJ LO00 (x2)
134630  -5 2586  RU4AJ DK2MAX JN58
134645 -14  855  R0AF RU4AJ RR73
134700 -17  821  RU4AJ RN6DE KN96
134700 -15 2586  RU4AJ DK2MAX JN58 (x2)
134745 -12  854  RN6DE RU4AJ RR73
134800 -11 2586  RU4AJ DK2MAX JN58
134815 -11  855  R9FGJ RU4AJ -11
134830 -10 2586  RU4AJ DK2MAX JN58 (x5)

80m

UTC    dB Audio  Message
200345  -3  861  4L6EZ RU4AJ LO00
200400  -6  592  RU4AJ 4L6EZ +02
200415  -5  861  4L6EZ RU4AJ R-05
203745 -18 1435  RI1FJZ RU4AJ LO00 (x2)
141715 -15  932  RA9UJ RU4AJ LO00 (x2)
192115 -10  735  SP5DFK/QRP RU4AJ LO00
005830  -4 1079  VU2NKS RU4AJ LO00 (x3)
174930 -19  735  RT3K RU4AJ LO00
174945  -9 2603  RU4AJ RT3K -06
175000 -19  734  RT3K RU4AJ R-04 (x2)

20m

UTC    dB Audio  Message
045315 +13  363  KM4G RU4AJ LO00 (x2)
045515 +15  363  KD7PCE RU4AJ LO00 (x2)
050230 +10  364  K9OM RU4AJ LO00
050500 +14  364  KA3BPN RU4AJ LO00 (x4)
040000  +2 1221  RK0SWA RU4AJ LO00 (x4)
040615 +12 1031  VK3GZY RU4AJ LO00
040815  +7 1031  RZ9AO RU4AJ LO00

10m

UTC    dB Audio  Message
174800  -5  333  R1BPZ RU4AJ R-07
070145  -9  352  VK3OE RU4AJ LO00 (x4)
200500  -6  445  PR7KH RU4AJ LO00
200615  -6  446  LU3HBA RU4AJ R-12 (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.

CW

CW history is temporarily unavailable.

Explore CW reception at SO8OO

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee