RA4CLU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO31

Receiver-side FT8 activity involving RA4CLU, decoded by SO8OO in southeastern Poland. 150 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-07 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 150 FT8 messages attributed to RA4CLU as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (77%), followed by 10 m (23%). Several six-hour UTC windows tied for the largest share (65%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (83%); the estimated median was 0 dB.

Overview

150

Messages attributed

UTC dates decoded

Active 15-min windows

0 dB

Estimated median S/N

Bands

20m · 115 10m · 35

First attributed message: 2026-06-07
Last attributed message: 2026-08-31 06:34 UTC

Observed FT8 message patterns

Attributed sample: 150 messages
Active dates: 6 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -11 to +8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 24, strong (≥ -8 dB) 124.

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 RA4CLU in decoded directed-looking exchanges:

9M8DEN · East Malaysia EA1CQ · Spain R7DX · European Russia RW6HP · European Russia VK3BE · Australia 3B8HK · Mauritius 3B9FR · Rodriguez Island DL2FX · Fed. Rep. of Germany EA7OC · Spain JA3JFT · Japan K2TQC · United States M1WLK · England

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 RA4CLU

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: LO31 · 7 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,774 km (approx.)
Last such locator decoded: 2026-07-17 12:28 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	RA4CLU S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-31 06:34	20m	+13 / -	UA9FLJ	- / -3	2	✓ Closing fragment
08-31 06:32	20m	+11 / -	R9OX	- / -14	2	✓ Closing fragment
08-31 06:28	20m	+5 / -	RI1FJL	- / -15	6	✓ Closing fragment
07-17 13:11	20m	+9 / -	KF0YOB	- / -6	2	Partial capture
07-17 13:09	20m	+2 / -	3B9FR	- / -15	2	✓ Closing fragment
07-17 13:01	20m	+8 / -	3B8HK	- / -13	3	✓ Closing fragment
07-17 12:56	20m	+6 / -	UA3RBM	- / +4	2	✓ Closing fragment
07-17 12:55	20m	+6 / -3	DL9KM	-24 / -16	3	Partial capture
07-17 12:26	20m	-6 / -	RL3QGD	- / -2	2	✓ Closing fragment
07-17 12:26	20m	-7 / -3	F1PBZ	-14 / -17	5	Partial capture
07-17 12:16	20m	+5 / -1	UA7T	-10 / -3	7	✓ Full exchange observed
07-17 12:11	20m	+2 / -	<...>	- / -13	4	Partial capture
07-17 12:08	20m	+1 / -	RX9WM	- / -1	2	✓ Closing fragment
07-17 12:01	20m	-2 / -	R1BED	- / -13	2	✓ Closing fragment
07-17 11:56	20m	0 / -	NY9H	- / -10	2	Partial capture
07-17 11:45	20m	+2 / -	KF0YOB	- / -3	8	Partial capture
07-13 07:47	20m	-12 / -	MM8FKF	- / -10	2	✓ Closing fragment
07-13 07:42	20m	-14 / -	JA3JFT	- / -14	4	✓ Closing fragment
07-13 07:38	20m	- / -	DL1R	-1 / -	8	Partial capture
07-13 07:31	20m	-11 / -	RA6OY	+3 / -6	7	Partial capture
07-13 07:27	20m	- / -1	RX3ASQ	-17 / -	3	✓ Closing fragment
07-13 06:51	20m	-7 / -	ZC4RH	- / -9	2	Partial capture
07-13 06:44	20m	- / -	F4HSB	-22 / -	2	Partial capture
07-13 06:42	20m	-6 / -3	DL2FX	-9 / -14	3	✓ Full exchange observed
07-13 06:39	20m	- / -	EA7OC	-14 / -	2	✓ Closing fragment
07-02 08:41	10m	- / +1	R7DX	-13 / -	5	✓ Closing fragment
07-02 08:31	10m	- / -9	RG7A	-15 / -	2	Partial capture
07-02 08:28	10m	- / +1	RW6HP	-18 / -	3	✓ Closing fragment
06-30 08:14	10m	-9 / -	9M8DEN	- / -6	2	✓ Closing fragment
06-30 07:23	10m	-4 / -	VK3DUT	- / -6	2	Partial capture
06-30 05:41	20m	-2 / -	KA6BIM	- / -10	4	Partial capture
06-30 05:38	20m	+10 / -	KD6KHK	- / -17	3	Partial capture
06-30 05:36	20m	+1 / -11	N9W	-2 / -4	5	✓ Full exchange observed
06-30 05:28	20m	+4 / -	9J2FI	- / -21	2	Partial capture
06-30 05:26	20m	+2 / -	KO3ZDE	- / -16	2	Partial capture
06-30 05:21	20m	+3 / -	W6XK	- / -12	2	Partial capture
06-30 05:19	20m	+2 / -	K2TQC	-11 / -5	3	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
131045  +6  549  3B9FR RA4CLU RR73
131145  +6  549  KF0YOB RA4CLU -06 (x2)
131345  +9  549  VE3XN RA4CLU -16
132400  +0  549  K8A RA4CLU -14
062815  -4  549  RI1FJL RA4CLU -15 (x6)
063245 +10  548  R9OX RA4CLU -14 (x2)
063415  +9  549  UA9FLJ RA4CLU -03 (x2)

10m

UTC    dB Audio  Message
072330  -4  518  VK3DUT RA4CLU -06
081430  -8  552  9M8DEN RA4CLU -06 (x2)
082415  -8  552  8A1WWA RA4CLU -10 (x2)
082800 -18 1659  RA4CLU RW6HP LN14 (x3)
083130 -13 1547  RA4CLU RG7A KN93 (x2)
084100 -15 1816  RA4CLU R7DX R+01 (x5)

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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