R2FDU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Kaliningrad Most frequent locator attributed to this token: JO94

Receiver-side FT8 activity involving R2FDU, decoded by SO8OO in southeastern Poland. 1,851 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 52 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-01.

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 1,851 FT8 messages attributed to R2FDU as the transmitting token by decoded message structure across 52 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (53%), followed by 80 m (26%) and 20 m (22%). Most decodes (71%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -6.1 dB.

Overview

1,851

Messages attributed

UTC dates decoded

233

Active 15-min windows

-6.1 dB

Estimated median S/N

Bands

80m · 474 40m · 976 20m · 401

First attributed message: 2026-06-07
Last attributed message: 2026-09-01 07:36 UTC

Observed FT8 message patterns

Attributed sample: 1,851 messages
Active dates: 52 UTC dates
Estimated median S/N: -6.1 dB
Estimated 10th-90th percentile: -17.2 to +10 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 301, moderate (-15 to -9 dB) 500, strong (≥ -8 dB) 1,050.

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 R2FDU in decoded directed-looking exchanges:

R5AV · European Russia ×4 LZ1ZF · Bulgaria ×4 RA4Y · European Russia ×3 R2AKN · European Russia ×3 RX3VF · European Russia ×2 RA3RPW · European Russia ×2 UB4HVA · European Russia ×2 R4SCQ · European Russia ×2 DL9KM · Fed. Rep. of Germany ×2 R9SR · Asiatic Russia ×2 R3ICU · European Russia ×2 DL2VN · Fed. Rep. of Germany ×2

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 R2FDU

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: JO94 · 404 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 542 km (approx.)
Last such locator decoded: 2026-09-01 06:44 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	R2FDU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-01 07:35	40m	-6 / -	<...>	- / -11	2	Partial capture
09-01 07:34	40m	-1 / -	EG42SDC	- / -11	2	Partial capture
09-01 06:47	40m	-2 / -	YU4NMT	- / -19	2	Partial capture
09-01 06:46	40m	-6 / -15	DG9FEH	-11 / -15	7	✓ Full exchange observed
09-01 06:44	40m	-5 / -	LA1SNA	- / -4	4	✓ Closing fragment
09-01 06:44	40m	- / -14	9A60CBM	-8 / -	2	Partial capture
09-01 06:40	40m	- / -	DL6LG	-13 / -	3	Partial capture
09-01 06:40	40m	-6 / -	UT2PC	- / 0	5	Partial capture
09-01 06:38	40m	-6 / -	SP9YGD	- / +1	2	✓ Closing fragment
09-01 06:37	40m	-4 / -	SP5FWT	- / -4	2	✓ Closing fragment
09-01 06:33	40m	-4 / -	LB8TG	- / -18	4	Partial capture
09-01 06:30	40m	-11 / -3	IZ5JNO	-2 / +1	5	✓ Full exchange observed
09-01 06:29	40m	-8 / -2	F4EMG	0 / -2	5	✓ Full exchange observed
09-01 06:28	40m	-5 / -14	YO3GNF	0 / -13	7	✓ Full exchange observed
09-01 06:27	40m	-6 / -	UB3ZKO	- / -17	2	✓ Closing fragment
09-01 06:25	40m	-6 / -	GJ0KYZ	-13 / -4	4	✓ Closing observed
08-31 20:39	40m	-2 / -	SP2ADY	-1 / -9	3	✓ Closing observed
08-31 20:14	40m	-2 / -8	R3LCW	+4 / +2	4	✓ Full exchange observed
08-31 20:09	40m	-2 / -	RZ6ALZ	- / -8	2	✓ Closing fragment
08-31 20:07	40m	-4 / +4	R3KLE	-9 / -5	3	✓ Full exchange observed
08-31 19:45	40m	0 / -	RA3AIW	- / -18	2	✓ Closing fragment
08-28 13:59	20m	- / -4	RZ9A	+10 / -	2	✓ Closing fragment
08-28 13:43	20m	- / -1	F4VTR	+3 / -	6	✓ Closing fragment
08-28 13:40	20m	- / -9	R8HC	-7 / -	2	✓ Closing fragment
08-28 05:23	40m	+3 / -	RA3DRI	- / -13	3	✓ Closing fragment
08-28 05:20	40m	+2 / -	WA2HIP	- / -23	4	Partial capture
08-27 19:42	40m	+4 / -	JE2URF	- / -17	2	Partial capture
08-27 19:38	40m	0 / -	R2FDP	-14 / -13	3	✓ Closing observed
08-27 19:29	40m	+2 / -	R1ZDG	- / -23	2	✓ Closing fragment
08-27 19:27	40m	0 / -	R2BRU	- / -7	2	Partial capture
08-27 19:23	40m	-2 / +2	R1NBG	0 / +1	4	✓ Full exchange observed
08-27 19:14	20m	- / -	IU0VOG	-8 / -	2	Partial capture
08-24 18:53	40m	+2 / -	JA0JWQ	- / -15	3	Partial capture
08-24 18:50	40m	+1 / -	R8LCP	- / -14	2	✓ Closing fragment
08-24 18:48	40m	+1 / -	VJ6X	- / -14	2	✓ Closing fragment
08-24 18:44	40m	+5 / -	RL3K	- / -6	3	Partial capture
08-24 18:42	40m	-2 / -	D2ACE	- / -18	4	✓ Closing fragment
08-24 18:40	40m	-6 / -	UB8FDN	-10 / -7	3	✓ Closing observed
08-24 18:37	40m	-2 / -3	RU3XW	-3 / -5	4	✓ Full exchange observed
08-24 18:36	40m	0 / 0	R1BDX	-8 / -4	4	✓ Full exchange observed
08-24 18:35	40m	0 / 0	R3PJ	-8 / 0	4	✓ Full exchange observed
08-24 18:33	40m	0 / -	UB6LLI	- / -20	2	✓ Closing fragment
08-24 18:31	40m	+5 / -	F4CVT	- / -	2	✓ Closing fragment
08-24 18:29	40m	0 / +3	YL2TM	-7 / -5	3	✓ Full exchange observed
08-22 23:15	40m	-6 / -	K3SWZ	- / -16	6	✓ Closing fragment
08-22 23:13	40m	-5 / -1	RX3DCZ	0 / -	3	✓ Closing observed
08-22 23:09	40m	-4 / -12	EA5HM	-14 / -16	10	✓ Full exchange observed
08-22 23:09	40m	- / -7	F1PBZ	-1 / -	3	Partial capture
08-22 23:08	40m	-6 / -	SP7NC	-7 / -2	4	✓ Full exchange observed
08-22 23:06	40m	-4 / -	NG2O	- / -19	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
064600  -5 2065  LA1SNA R2FDU R-13
064645 -12  964  R2FDU DG9FEH JO40
064700  -2 2065  YU4NMT R2FDU -19
064715 -10  964  R2FDU DG9FEH JO40
064730  -2 2065  YU4NMT R2FDU -19
064745 -11  964  R2FDU DG9FEH JO40
064800  -7 2064  DG9FEH R2FDU -15
064815 -12  963  R2FDU DG9FEH R-15
064830  -5 2064  DG9FEH R2FDU RR73
064845 -16  731  R2FDU DL6LG JO60
064845  -9  964  R2FDU DG9FEH 73
073445  +1 2064  EG42SDC R2FDU -11 (x2)
073545  -5 1943  <...> R2FDU -11 (x2)

20m

UTC    dB Audio  Message
120615 -17 1966  R2FDU R7ZY 73
120815 -10 1259  R2FDU RG6S RR73 (x2)
191400 -14 2619  R2FDU IU0VOG JN61 (x2)
134015  -9 2097  R2FDU R8HC R-09 (x2)
134330  +2 1769  R2FDU F4VTR JN25 (x6)
135930 +10 1527  R2FDU RZ9A R-04 (x2)

80m

UTC    dB Audio  Message
204615 +18  878  IK0HBN R2FDU -03
204630  +6 2163  R2FDU IK0HBN R-02
204645 +10  878  IK0HBN R2FDU RR73
204700  +6 2163  R2FDU IK0HBN 73
205215 +15  878  R7CD R2FDU -10
205230  +3 1425  R2FDU R7CD R+00
205245 +13  878  R7CD R2FDU RR73
205300  +2 1425  R2FDU R7CD 73
213530 +14  878  RY2B R2FDU -07
213545  -3 1253  R2FDU RY2B R+01
213600 +17  878  RY2B R2FDU RR73
213615  -1 1253  R2FDU RY2B 73
213745 +19  878  UA0TP R2FDU -20 (x3)

10m

UTC    dB Audio  Message
114700 -15  977  R2FDU RX6LQH -05
120130 -16 1978  R2FDU RZ6L 73
120630  -8 2595  R2FDU RX7O +01 (x2)
081800 -18 1547  R2FDU R7NO R-20 (x2)
081930  +6 2110  R2FDU IK2XYA JN45 (x2)
082300  -8 1278  R2FDU IZ6ENY JN62 (x2)
083830 -15 2484  R2FDU RV9CX -08
083900  -2  718  R2FDU IK2SND JN45 (x3)
110200 -21 1850  R2FDU RK4F R-03

60m

UTC    dB Audio  Message
183430  -5 2790  R2FDU LA4GHA JO59 (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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