RU4D — 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: LO21

Receiver-side FT8 activity involving RU4D, decoded by SO8OO in southeastern Poland. 660 FT8 messages attributed to this token as transmitter, on 20m, across 39 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-31.

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 660 FT8 messages attributed to RU4D as the transmitting token by decoded message structure across 39 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (66%) fell within the six-hour window 12:00-18:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8 dB.

Overview

660

Messages attributed

UTC dates decoded

113

Active 15-min windows

-8 dB

Estimated median S/N

Bands

20m · 660

First attributed message: 2026-06-06
Last attributed message: 2026-08-31 13:02 UTC

Observed FT8 message patterns

Attributed sample: 660 messages
Active dates: 39 UTC dates
Estimated median S/N: -8 dB
Estimated 10th-90th percentile: -19 to +1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 140, moderate (-15 to -9 dB) 180, strong (≥ -8 dB) 340.

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 RU4D in decoded directed-looking exchanges:

3B8GL · Mauritius ×2 7Z1AL · Saudi Arabia ×2 EC3A · Spain ×2 EX7CQ · Kyrgyzstan ×2 PD1RMB · Netherlands ×2 2I0WAI · Northern Ireland 4X1UF · Israel 5B4ARQ · Cyprus 5Z4VJ · Kenya 7Z1BM · Saudi Arabia 8S2X · Sweden 9A0W · Croatia

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 RU4D

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: LO21 · 37 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,636 km (approx.)
Last such locator decoded: 2026-08-30 15:27 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	RU4D S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-31 15:03	40m	- / -4	RA6OD	-12 / -	3	Partial capture
10-31 14:52	40m	- / -19	UD3T	-4 / -	2	✓ Closing fragment
10-31 14:42	40m	- / -3	R3MW	-21 / -	2	✓ Closing fragment
10-31 14:42	40m	- / 0	UA5D	-15 / -	2	✓ Closing fragment
10-31 14:37	40m	- / -6	R3UCQ	-12 / -	3	✓ Closing fragment
10-29 15:15	80m	- / -12	RY7F	-4 / -	2	✓ Closing fragment
10-29 15:13	80m	- / -11	R7DX	-2 / -	4	Partial capture
10-29 15:11	80m	- / -15	RO5A	-10 / -	3	✓ Closing fragment
10-29 15:05	80m	- / -14	R6FMK	-17 / -	3	✓ Closing fragment
10-28 15:20	40m	- / -15	RA7Z	-6 / -	4	Partial capture
10-28 15:18	40m	- / +4	RL3QGD	-7 / -	3	✓ Closing fragment
10-28 15:13	40m	- / -6	EX7CQ	-16 / -	2	✓ Closing fragment
10-26 17:02	40m	- / -4	R6YG	-8 / -	2	✓ Closing fragment
09-26 04:27	40m	- / -1	RO3ZR	-12 / -	2	✓ Closing fragment
09-19 05:41	40m	- / -13	EU4U	-8 / -	2	✓ Closing fragment
09-12 05:30	40m	- / -	RA6OD	-9 / -	2	✓ Closing fragment
09-12 05:29	40m	- / -8	R2EA	-12 / -	2	✓ Closing fragment
08-31 13:01	20m	-9 / -	JJ5NFT	- / -13	2	Partial capture
08-31 12:59	20m	-10 / -	BG0FQU	- / -8	4	Partial capture
08-31 12:57	20m	-10 / -	JH8SIT	- / +3	2	✓ Closing fragment
08-31 12:34	20m	-6 / -10	PA1GUZ	+4 / -8	2	Partial capture
08-31 03:48	20m	0 / -	SM7TZK	- / -3	2	✓ Closing fragment
08-31 03:42	20m	+2 / -	IU5AWQ	- / -12	6	✓ Closing fragment
08-31 03:39	20m	0 / -	A41ZZ	- / -11	2	✓ Closing fragment
08-30 15:40	20m	+2 / -	EC3A	0 / -8	3	✓ Closing observed
08-30 15:38	20m	-1 / -	RI1FJL	- / -6	2	Partial capture
08-30 15:34	20m	-10 / -2	2I0WAI	-11 / -1	6	✓ Full exchange observed
08-30 15:31	20m	-1 / -	BG2ATH	- / -6	2	Partial capture
08-30 15:28	20m	0 / -	PD1RMB	- / -13	5	✓ Closing fragment
08-30 15:23	20m	0 / -	DL1HDL	- / -9	4	Partial capture
08-28 15:47	20m	-8 / -17	3B8GL	-12 / -10	12	✓ Full exchange observed
08-28 15:46	20m	-5 / -3	F5DAN	-17 / -9	3	✓ Full exchange observed
08-28 15:45	20m	-4 / -	BG8HNC	- / -15	2	Partial capture
08-28 15:43	20m	-4 / -	VR2VOG	- / -17	3	Partial capture
08-28 04:02	20m	-2 / -	XE2KBR	- / -16	2	Partial capture
08-28 04:00	20m	-4 / -	KB2ELA	- / -9	2	✓ Closing fragment
08-28 03:59	20m	+1 / -	A99AA	- / 0	2	Partial capture
08-28 03:57	20m	-2 / -12	NG7M	-2 / -8	5	✓ Full exchange observed
08-28 03:56	20m	-4 / -	K2KDX	- / -10	2	Partial capture
08-28 03:52	20m	+4 / -	ZL2BX	- / -10	2	Partial capture
08-28 03:50	20m	0 / -	ZL1BQD	- / -16	2	Partial capture
08-28 03:47	20m	+9 / -	KJ5PTH	- / -13	3	✓ Closing fragment
08-28 03:45	20m	+4 / -3	5Z4VJ	-7 / -1	4	✓ Full exchange observed
08-28 03:43	20m	-10 / -	N4RLS	- / -6	2	Partial capture
08-28 03:40	20m	-12 / -	W6GIG	- / -14	3	Partial capture
08-28 03:37	20m	-15 / -	N4RLS	- / -11	3	Partial capture
08-28 03:33	20m	- / -12	VK2PV	-15 / -	2	✓ Closing fragment
08-28 03:22	20m	- / -10	XQ1KK	-8 / -	2	✓ Closing fragment
08-27 16:49	20m	+2 / -	CN8NS	- / -13	3	Partial capture
08-27 06:47	20m	- / -15	DB7GE	-1 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
150445 -11  851  RU4D UB4FGK R-06
150515 -17 1868  RU4D R6FMK LN05 (x3)
151115 -12 1225  RU4D RO5A KO85 (x3)
151315  -4 1574  RU4D R7DX KN84 (x4)
151545  -5 2494  RU4D RY7F R-12 (x2)
102430 -20 2008  RU4D SP9KW JN99

40m

UTC    dB Audio  Message
152130  -5 2529  RU4D RA7Z R-15
152200 -16 1914  RU4D YO1BRANCUSI R-12
152200  -6 2529  RU4D RA7Z R-15
143700  -9 1852  RU4D R3UCQ R-06 (x3)
144200 -16 1874  RU4D UA5D R+00 (x2)
144230 -23 1648  RU4D R3MW R-03 (x2)
145245  -6 2350  RU4D UD3T R-19 (x2)
150300 -13 1813  RU4D RA6OD KN97 (x3)

20m

UTC    dB Audio  Message
034915  -2 2211  SM7TZK RU4D RR73
122445  -3 2208  II7MGBT RU4D -14
122615  -8 2208  PA4AV RU4D -11
123400  -6 2208  PA1GUZ RU4D -08
123415  +4 2225  RU4D PA1GUZ R-10
124400  -2  952  RU4D DL3EBJ 73
125400  -3 2209  JH8SIT RU4D -03 (x3)
125945 -10 2165  BG0FQU RU4D -08 (x4)
130145  -8 2164  JJ5NFT RU4D -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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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