R4FDD — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO33

Receiver-side FT8 activity involving R4FDD, decoded by SO8OO in southeastern Poland. 2,693 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 37 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-12.

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 2,693 FT8 messages attributed to R4FDD as the transmitting token by decoded message structure across 37 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (38%), followed by 20 m (35%) and 40 m (14%). The busiest six-hour window was 00:00-06:00 UTC, containing 38% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8.7 dB.

Overview

2,693

Messages attributed

UTC dates decoded

439

Active 15-min windows

-8.7 dB

Estimated median S/N

Bands

160m · 135 80m · 1,032 40m · 364 20m · 936 10m · 226

First attributed message: 2026-06-06
Last attributed message: 2026-09-12 03:19 UTC

Observed FT8 message patterns

Attributed sample: 2,693 messages
Active dates: 37 UTC dates
Estimated median S/N: -8.7 dB
Estimated 10th-90th percentile: -19 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 551, moderate (-15 to -9 dB) 800, strong (≥ -8 dB) 1,342.

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 R4FDD in decoded directed-looking exchanges:

RC6OD · European Russia ×6 RX6DA · European Russia ×5 RA3ZGT · European Russia ×5 RT6Z · European Russia ×4 R6ML · European Russia ×4 R9CA · Asiatic Russia ×4 UN8PC · Kazakhstan ×4 R3OZ · European Russia ×4 UN8DSW · Kazakhstan ×4 RA9LL · Asiatic Russia ×3 R2EA · European Russia ×3 EW8AAC · Belarus ×3

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 R4FDD

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: LO33 · 574 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,771 km (approx.)
Last such locator decoded: 2026-08-29 13:27 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	R4FDD S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-12 03:31	40m	- / +4	SV1ENG	-5 / -	4	Partial capture
09-12 03:28	40m	- / -	R4WZ	-22 / -	2	✓ Closing fragment
09-12 03:21	40m	- / +5	UA6LET	+6 / -	2	✓ Closing fragment
09-12 03:10	40m	-9 / -3	R7HL	-9 / -	2	✓ Closing observed
09-12 03:08	40m	-10 / -	LZ1SJ	- / -6	2	✓ Closing fragment
09-12 03:05	40m	-18 / -	UN3QA	- / -22	2	✓ Closing fragment
09-12 03:00	40m	-10 / -	IZ5HLP	- / -14	3	✓ Closing fragment
09-12 02:59	40m	-2 / -8	CR7BRV	-18 / -15	4	✓ Full exchange observed
09-12 02:56	40m	-9 / -	UI6O	- / -5	2	✓ Closing fragment
09-12 02:54	40m	-11 / -1	RQ6B	-12 / -	2	✓ Closing observed
09-12 02:53	40m	0 / -	EW2GI	- / -11	2	✓ Closing fragment
09-12 02:51	40m	-12 / 0	RA9ACA	-23 / -	2	✓ Closing observed
09-12 02:48	40m	-4 / -	UA9CFH	-14 / -7	4	✓ Full exchange observed
09-12 02:44	40m	-1 / -	UA9XL	- / -3	4	✓ Closing fragment
09-12 02:42	40m	-2 / -	R9CA	- / -7	2	✓ Closing fragment
09-12 02:41	40m	-6 / -	R8QA	- / -7	2	✓ Closing fragment
09-12 02:40	40m	0 / -	SM7TZK	- / -11	2	✓ Closing fragment
09-12 02:38	40m	-2 / -	PY1USK	- / -23	3	✓ Closing fragment
09-12 02:37	40m	0 / -	F4GVO	- / -16	2	✓ Closing fragment
09-12 02:35	40m	0 / -15	EA3IAZ	-6 / -19	5	✓ Full exchange observed
09-12 02:34	40m	-13 / -	DL1SRS	- / -19	2	✓ Closing fragment
09-12 02:33	40m	-14 / -	PY5QW	- / -15	2	✓ Closing fragment
09-12 02:32	40m	-14 / -1	CT7AUT	-18 / -19	4	✓ Full exchange observed
09-12 02:30	40m	-10 / -	DK7UY	- / -17	2	✓ Closing fragment
09-12 02:27	40m	-16 / -	HA1ORA	- / -20	4	✓ Closing fragment
09-12 02:23	40m	-10 / -7	7Z1BQ	-4 / -20	5	✓ Full exchange observed
09-12 02:17	40m	- / -8	GM6URC	-13 / -	2	✓ Closing fragment
09-12 02:10	40m	- / -8	SV9QWC	-12 / -	2	✓ Closing fragment
09-12 02:03	80m	-10 / -	DJ0BS	- / -18	2	Partial capture
09-12 02:02	80m	- / -5	R5ZJ	+5 / -	2	✓ Closing fragment
09-12 01:59	80m	0 / -16	HB9EOT	+8 / -16	4	✓ Full exchange observed
09-12 01:56	80m	-3 / -6	IZ2AMW	+9 / -6	6	✓ Full exchange observed
09-12 01:54	80m	-1 / -2	YO3GNF	+6 / -10	4	✓ Full exchange observed
09-12 01:49	80m	-11 / -	R9FFQ	- / -16	3	Partial capture
09-12 01:46	80m	-11 / -18	ON4MAP	-9 / -22	5	✓ Full exchange observed
09-12 01:45	80m	- / -13	SP2JJ	+7 / -	2	✓ Closing fragment
09-12 01:35	80m	-7 / -12	SP3HGD	-14 / -	4	✓ Closing observed
09-12 01:29	80m	0 / +1	LY2EW	+16 / -10	4	✓ Full exchange observed
09-12 01:27	80m	-12 / 0	RY7F	-1 / +2	4	✓ Full exchange observed
09-12 01:26	80m	+4 / 0	RA6HTU	-2 / -1	4	✓ Full exchange observed
09-12 01:25	80m	-1 / -	TF3VS	- / -14	2	Partial capture
09-12 01:24	80m	+1 / -8	DO4EB	-8 / -	3	✓ Closing observed
09-12 01:19	80m	+2 / -5	R2AKV	-20 / -18	4	✓ Full exchange observed
09-12 01:16	80m	-5 / -17	DL0RDG	-3 / -	3	✓ Closing observed
09-12 01:10	80m	-6 / -8	RW9RR	-19 / -18	3	✓ Full exchange observed
09-12 01:07	80m	-1 / -9	CT7AUT	-20 / -19	3	Partial capture
09-12 01:04	80m	+3 / -	EH3ST	- / -12	3	Partial capture
09-12 00:59	80m	0 / -12	DA6OOM	-12 / -17	7	✓ Full exchange observed
09-12 00:56	80m	-14 / +8	RG7K	-2 / -	3	✓ Closing observed
09-12 00:54	80m	+6 / -1	SP6JIU	+23 / -	3	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
030615 -16 2190  UN3QA R4FDD RR73
030845 -12 1106  LZ1SJ R4FDD -06 (x2)
031015  -9 1910  R4FDD R7HL R-03
031030  -9 1911  R7HL R4FDD RR73
031045  -5 1910  R4FDD QSO B4
031945 -17 2137  YO3SRJ R4FDD RR73
032145  +5  926  R4FDD UA6LET R+05 (x2)
032830 -24 1293  R4FDD R4WZ R+14 (x2)
033100 -13 1887  R4FDD SV1ENG R+04 (x4)

80m

UTC    dB Audio  Message
015700  -7 1903  IZ2AMW R4FDD -06
015745 +11 2613  R4FDD IZ2AMW R-06 (x2)
015830  +8 2613  IZ2AMW R4FDD RR73
015845  +7 2613  R4FDD IZ2AMW 73
015900  -5  645  HB9EOT R4FDD -16
015915  +8  645  R4FDD HB9EOT R-16
015930  +4  646  HB9EOT R4FDD RR73
015945  +8  645  R4FDD HB9EOT 73
020130  -8 2261  EA3AKY R4FDD -09
020245  +3 2163  R4FDD R5ZJ R-05 (x2)
020330  -9 1417  DJ0BS R4FDD -18 (x2)
020530  -9 2077  OH7FES R4FDD RR73

160m

UTC    dB Audio  Message
013045 -10 1503  CQ R4FDD LO33 (x13)
172715  -7 2589  R4FDD OM3SX R-11 (x2)

20m

UTC    dB Audio  Message
101100 -14 2451  R4FDD PD4KK -13
101145 -11 2304  UN0PA R4FDD LO33
101200 -15 2451  R4FDD PD4KK -13
101215 -10 2303  UN0PA R4FDD LO33 (x2)
101415  -1  589  I0KJX R4FDD LO33 (x2)
130415 -24 1721  BI1OBD R4FDD LO33 (x3)
130545 -24 1722  UA9UDO R4FDD LO33 (x2)
130745 -24 1722  G8IXM R4FDD LO33
132630 -22 1620  7E3E R4FDD LO33 (x2)

10m

UTC    dB Audio  Message
093345 -15 1425  R4FDD IK6GPZ JN62 (x3)
093830 -24 1682  HA1DAE R4FDD RR73
095200 -20 1497  R4FDD RV6F R+07
100145 -15 1647  R4FDD SV1CQN R-15 (x2)
101045 -17 1800  R4FDD RA6ATZ 73
101415 -18 1380  R4FDD IK7MIY R-08 (x2)
102300 -15 2106  R4FDD EA3AKY R-19 (x2)
140445 +11  626  R4FDD OZ0A -10 (x3)

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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