RD4CAF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Locator transmitted in a decoded message: LO21

Receiver-side FT8 activity involving RD4CAF, decoded by SO8OO in southeastern Poland. 257 related FT8 messages, 1 CQ messages, observed on 80m, 40m, across 14 UTC dates. Heard between 2026-05-17 and 2026-08-15.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

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

Overview

257

Related messages

CQ messages

UTC dates heard

-3 dB

Mean decoder S/N

Bands

80m 40m

First seen: 2026-05-17
Last seen: 2026-08-15 19:49 UTC

Frequent QSO partners observed at SO8OO

Stations RD4CAF worked most often, as logged from our receiver:

RK4HS · European Russia ×2 RW9FZ · European Russia ×2 RW0AE · Asiatic Russia RN2F · Kaliningrad SV8SXD · Greece RZ6ALZ · European Russia DF7GG · Fed. Rep. of Germany EW4DX · Belarus IK1RQX · Italy S56KO · Slovenia PA3FPQ · Netherlands IK8RIK · Italy

Activity Heatmap

Locator transmitted by RD4CAF

Approximate centre of LO21, decoded 2026-08-02 23:45 UTC. A transmitted locator is not proof of the operator's permanent location.

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	RD4CAF S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-15 21:48	80m	-6 / +7	R50RKZ	-2 / +8	3	✓ Full exchange observed
08-15 21:13	40m	-18 / -	RW3C/P	- / -11	2	✓ Closing fragment
08-15 21:11	40m	-9 / -7	S56KO	-2 / -6	6	✓ Full exchange observed
08-15 21:09	40m	-8 / -1	SV2HTW	-4 / +1	2	Partial capture
08-15 21:08	40m	-9 / -	RW9FZ	- / +2	2	✓ Closing fragment
08-02 23:49	80m	-4 / -5	EW2ZC	+5 / -9	3	✓ Full exchange observed
08-02 23:47	80m	-2 / -	RZ6ALZ	- / +4	3	✓ Closing fragment
08-02 23:45	80m	-2 / +1	RW9FZ	0 / -	4	✓ Closing observed
08-02 23:43	80m	+2 / -14	RN3YN	-4 / -6	4	✓ Full exchange observed
06-08 20:35	40m	-12 / -16	S56LKP	+4 / -	14	✓ Closing observed
06-08 20:28	40m	- / 0	EW4DX	+15 / -	3	✓ Closing fragment
06-08 20:18	80m	- / -	RA4Y	-18 / -	2	✓ Closing fragment
06-08 20:06	80m	-24 / -	R6DOB	+9 / -	2	✓ Closing observed
05-30 22:30	80m	-12 / -2	RV3YN	-12 / +5	5	✓ Full exchange observed
05-30 22:07	40m	-13 / -	R95WTA	- / -21	5	Partial capture
05-30 22:03	80m	-9 / -	R2EN	- / +2	4	Partial capture
05-30 21:48	80m	- / -11	PA3FPQ	+14 / -	4	✓ Closing fragment
05-30 21:46	80m	-19 / -8	R1CBK	-5 / -6	5	✓ Full exchange observed
05-30 21:39	80m	- / -15	RN2F	+6 / -	2	✓ Closing fragment
05-29 00:43	40m	-15 / -18	UF1A	+4 / -	3	✓ Closing observed
05-29 00:41	40m	-16 / -10	IK8RIK	-6 / -9	5	✓ Full exchange observed
05-29 00:38	40m	- / -1	SV8SXD	+1 / -	2	✓ Closing fragment
05-29 00:37	40m	- / -	IK8RIK	-4 / -	2	Partial capture
05-29 00:36	40m	- / -20	SV3AUW	-17 / -	3	Partial capture
05-28 19:37	80m	- / 0	R7CD	-4 / -	2	✓ Closing fragment
05-28 16:19	40m	- / -15	EW4DX	+8 / -	4	Partial capture
05-28 09:24	20m	0 / -	SV1EKI	- / -7	2	Partial capture
05-28 09:19	20m	+2 / -	SX20RCK	- / -10	8	Partial capture
05-28 09:17	20m	-5 / -	<...>	- / -10	3	Partial capture
05-28 09:02	20m	-6 / -	SV1MOZ	- / -11	2	Partial capture
05-28 08:57	20m	-8 / -	SV2PII	- / -14	3	Partial capture
05-27 23:31	40m	-8 / -	RW0AE	- / -13	3	✓ Closing fragment
05-27 23:01	40m	- / -13	PD0LBY	-4 / -	2	Partial capture
05-27 22:57	40m	-20 / -13	RD6OB	0 / -	3	✓ Closing observed
05-27 22:45	40m	-10 / 0	E70A	-8 / -10	4	✓ Full exchange observed
05-27 22:43	40m	-5 / -8	IK1RQX	+18 / +2	7	✓ Full exchange observed
05-27 22:42	40m	-8 / -16	R3DLZ	-12 / -19	4	✓ Full exchange observed
05-27 22:36	80m	-18 / -	RX3ASQ	- / +3	3	Partial capture
05-27 20:09	80m	- / -14	UA3QQG	-16 / -	2	✓ Closing fragment
05-27 19:49	20m	-4 / -	SV1MOZ	- / -3	2	Partial capture
05-27 19:42	40m	- / -22	LX1RFJ	-3 / -	2	✓ Closing fragment
05-27 19:18	80m	-18 / -10	UA1AEL	+6 / +1	4	✓ Full exchange observed
05-27 19:17	80m	-13 / -	RX3ASQ	- / -1	2	Partial capture
05-27 19:11	80m	-14 / -	RX3ASQ	- / -3	3	Partial capture
05-27 08:47	20m	-10 / -	SV1EKI	- / -18	3	Partial capture
05-27 00:30	40m	-19 / -	RU3DBT	-18 / -15	3	✓ Closing observed
05-27 00:27	40m	-20 / -7	SV3AUW	-24 / -10	2	Partial capture
05-26 21:11	40m	- / -24	DF7GG	-1 / -	3	✓ Closing fragment
05-26 20:52	80m	- / +8	US1EA	-4 / -	2	✓ Closing fragment
05-26 20:48	80m	-20 / -2	RK4HS	-18 / +7	4	✓ 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
234400  -4  653  RD4CAF RN3YN 73
234530  -3 2589  RW9FZ RD4CAF LO21
234545  -1 2583  RD4CAF RW9FZ +01
234600  -1 2589  RW9FZ RD4CAF RR73
234615  +0 2583  RD4CAF RW9FZ 73
234745  -1 1764  RZ6ALZ RD4CAF +04 (x3)
234915  -6 2076  EW2ZC RD4CAF -09
234930  +5 2071  RD4CAF EW2ZC R-05
234945  -2 2076  EW2ZC RD4CAF RR73
214845  -5 1612  R50RKZ RD4CAF +08
214900  -2 1609  RD4CAF R50RKZ R+07
214915  -6 1612  R50RKZ RD4CAF RR73
214930  -5 1609  RD4CAF RR73; DD7EE <...> +00

40m

UTC    dB Audio  Message
204045  +2 2448  RD4CAF S56LKP R-16
210800  -8 2646  RW9FZ RD4CAF +02 (x2)
210930  -8  927  SV2HTW RD4CAF +01
210945  -4  923  RD4CAF SV2HTW R-01
211015 -12 1466  RD4CAF IU2HUQ -11
211100  +0  731  RD4CAF S56KO R-07
211115  -9  734  S56KO RD4CAF -06 (x2)
211200  -9  731  RD4CAF S56KO R-07
211215  -9  734  S56KO RD4CAF RR73
211230  +3  731  RD4CAF S56KO 73
211315 -18 1750  RW3C/P RD4CAF -11 (x2)
211645 -11  496  GW4HZA RD4CAF -19

20m

UTC    dB Audio  Message
090315  -5 1127  SV1MOZ RD4CAF -11
091715  -6 1687  <...> RD4CAF -10 (x3)
091915  +4 2774  SX20RCK RD4CAF -10 (x2)
092045  +4 2772  <...> RD4CAF -10
092115  +3 2772  SX20RCK RD4CAF -10 (x6)
092445  -1 2715  SV1EKI RD4CAF -07 (x2)

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.