F4LDC — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: JN23

Receiver-side FT8 activity involving F4LDC, decoded by SO8OO in southeastern Poland. 265 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 19 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-08-16.

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 265 FT8 messages attributed to F4LDC as the transmitting token by decoded message structure across 19 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (78%), followed by 10 m (12%) and 40 m (8%). The busiest six-hour window was 15:00-21:00 UTC, containing 49% of decodes. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (74%); the estimated median was -5 dB.

Overview

265

Messages attributed

UTC dates decoded

Active 15-min windows

-5 dB

Estimated median S/N

Bands

80m · 2 40m · 22 20m · 208 10m · 33

First attributed message: 2026-06-09
Last attributed message: 2026-08-16 15:41 UTC

Observed FT8 message patterns

Attributed sample: 265 messages
Active dates: 19 UTC dates
Estimated median S/N: -5 dB
Estimated 10th-90th percentile: -12 to +4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 66, strong (≥ -8 dB) 197.

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 F4LDC in decoded directed-looking exchanges:

PD0HLA · Netherlands ×2 3G0YM · Easter Island OH0ERF · Aland Islands C91RU · Mozambique DJ1TU · Fed. Rep. of Germany DL1R · Fed. Rep. of Germany EW7DDR · Belarus HL2CFY · Republic of Korea IU8JLX · Italy J40GAY · Greece JA4FKX · Japan KF9UG · United States

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 F4LDC

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: JN23 · 148 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,462 km (approx.)
Last such locator decoded: 2026-08-16 15:41 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	F4LDC S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-16 15:38	20m	+1 / 0	<...>	-5 / -5	9	Partial capture
08-12 16:06	20m	-14 / -	ON5VN/P	- / -	3	Partial capture
08-11 18:06	10m	-5 / -	OH0ERF	- / -8	3	✓ Closing fragment
08-11 17:55	20m	-5 / -	TT1GD	- / -9	3	✓ Closing fragment
08-11 17:45	20m	+6 / -	XU7O	- / -8	4	✓ Closing fragment
08-05 04:58	80m	-10 / -	HI8UD	- / -	2	Partial capture
07-20 05:26	20m	-14 / -	KK5JY	- / -13	2	✓ Closing fragment
07-20 05:24	20m	-4 / -	UA3POG	- / -17	2	Partial capture
07-20 05:22	20m	-8 / -	SP8NFO	- / -4	2	✓ Closing fragment
07-20 05:15	20m	-14 / -25	TK5K	-4 / -16	4	✓ Full exchange observed
07-11 10:40	20m	-6 / -	PD1HBL	- / -3	2	✓ Closing fragment
07-11 10:38	20m	-6 / -	IU8JLX	- / -10	2	✓ Closing fragment
07-11 10:36	20m	-12 / +1	DJ1TU	-12 / -	5	✓ Closing observed
07-11 10:33	20m	- / -1	LB2YJ	-22 / -	2	✓ Closing fragment
07-11 10:13	10m	-8 / -	<...>	- / -	2	Partial capture
07-08 17:23	20m	-2 / -	RN6MA	- / -2	2	✓ Closing fragment
07-08 17:21	20m	-4 / -	RX3VF	- / -4	2	✓ Closing fragment
07-08 05:12	20m	-1 / -	SP5EXA	- / -2	5	✓ Closing fragment
07-05 18:19	40m	-5 / -	ZS6KBS	- / -	3	Partial capture
07-05 18:07	20m	-8 / -	BY6SX	- / -24	3	Partial capture
07-05 18:03	20m	-8 / -	M0SCK	- / -14	2	✓ Closing fragment
07-05 18:00	20m	-9 / -	JA4FKX	-13 / -9	3	✓ Closing observed
07-04 15:54	20m	-3 / -	UK7AL	- / -12	7	Partial capture
07-04 15:43	20m	-10 / -	UK7AL	- / -	4	Partial capture
07-04 09:38	10m	-10 / -	9H4JX	- / -	2	Partial capture
06-29 20:27	20m	0 / -	6K5EKI	- / -	2	Partial capture
06-29 20:18	20m	0 / -	J40GAY	- / -14	3	✓ Closing fragment
06-29 20:14	20m	+2 / -	HL2CFY	- / -13	4	✓ Closing fragment
06-28 10:44	10m	-6 / -	7Q3WS	- / -10	3	Partial capture
06-26 05:10	20m	-3 / -4	DL1R	-3 / -10	8	✓ Full exchange observed
06-26 05:09	20m	-4 / -	XE2EJ	- / -10	2	✓ Closing fragment
06-26 05:00	20m	-6 / -	C91RU	- / -14	4	✓ Closing fragment
06-25 16:28	20m	-9 / -	R5AV	-15 / -18	3	✓ Closing observed
06-25 16:26	20m	-10 / -	UA4AFY	- / -6	2	✓ Closing fragment
06-25 16:24	20m	-9 / -7	S55A	-3 / -10	2	Partial capture
06-25 16:23	20m	-8 / -	EW7DDR	- / -19	2	✓ Closing fragment
06-25 16:22	20m	-12 / -	PD9JPV	- / -9	2	✓ Closing fragment
06-25 16:21	20m	-7 / -	RK3AQ	- / -15	2	✓ Closing fragment
06-25 16:16	20m	-9 / -8	LZ1BT	-9 / -14	8	✓ Full exchange observed
06-25 16:14	20m	-5 / -	BI8SCC	- / -	2	Partial capture
06-25 16:11	20m	-9 / -	EX8ABR	- / -	3	Partial capture
06-24 17:27	10m	+6 / -	PD0HLA	- / -12	2	✓ Closing fragment
06-24 17:17	10m	+1 / -	3G0YM	- / -16	18	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
175545  -4 2498  TT1GD F4LDC R-09 (x2)
160530  -2 2762  BU2FW F4LDC JN23
160630 -14 2442  ON5VN/P F4LDC JN23 (x3)
153815  +4 2818  <...> F4LDC JN23 (x7)
154130  -5  452  F4LDC <...> +00
154145  +3 2818  <...> F4LDC R-05

10m

UTC    dB Audio  Message
172715  +8 2672  PD0HLA F4LDC R-12 (x2)
083815  -5 2731  VU2RS F4LDC JN23
104415  -8 2805  7Q3WS F4LDC JN23 (x3)
093845 -11 2558  9H4JX F4LDC JN23 (x2)
183445  +0 2678  <...> F4LDC JN23 (x3)
101715 -13 2628  PE1NPS F4LDC -02
180600 -10 2584  OH0ERF F4LDC JN23 (x3)

80m

UTC    dB Audio  Message
045830 -13 2626  HI8UD F4LDC JN23 (x2)

40m

UTC    dB Audio  Message
181930  -4 2943  ZS6KBS F4LDC JN23 (x3)
182415  -6 2942  <...> F4LDC JN23

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.

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