F5SJC — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: JN05

Receiver-side FT8 activity involving F5SJC, decoded by SO8OO in southeastern Poland. 2,302 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 55 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-09-15.

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 2,302 FT8 messages attributed to F5SJC as the transmitting token by decoded message structure across 55 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (50%), followed by 20 m (46%) and 10 m (4%). Most decodes (54%) fell within the six-hour window 16:00-22:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (68%); the estimated median was -5 dB.

Overview

2,302

Messages attributed

UTC dates decoded

280

Active 15-min windows

-5 dB

Estimated median S/N

Bands

40m · 1,152 20m · 1,064 10m · 86

First attributed message: 2026-06-09
Last attributed message: 2026-09-15 21:36 UTC

Observed FT8 message patterns

Attributed sample: 2,302 messages
Active dates: 55 UTC dates
Estimated median S/N: -5 dB
Estimated 10th-90th percentile: -15 to +5 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 225, moderate (-15 to -9 dB) 521, strong (≥ -8 dB) 1,556.

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 F5SJC in decoded directed-looking exchanges:

DF2RG · Fed. Rep. of Germany ×2 DL9KM · Fed. Rep. of Germany ×2 AO5FSB · Spain ×2 CN2DX · Morocco ×2 EA4D · Spain ×2 F1PBZ · France ×2 IK4LZH · Italy ×2 M0LHJ · England ×2 M7INZ · England ×2 R3ZBY · European Russia ×2 R4CHN · European Russia ×2 RL2F · Kaliningrad ×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 F5SJC

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: JN05 · 1,047 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,626 km (approx.)
Last such locator decoded: 2026-09-15 21:34 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	F5SJC S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 21:34	40m	-14 / -	9A5MP	- / -23	6	Partial capture
09-15 21:28	40m	-11 / -	PZ5RA	- / -12	3	Partial capture
09-15 21:27	40m	-4 / -	OS9T	- / -	2	Partial capture
09-15 21:22	40m	-9 / -11	M0BEW	-11 / -11	6	✓ Full exchange observed
09-15 21:20	40m	-10 / -	EA5JQE	- / -10	2	Partial capture
09-15 21:13	40m	-10 / -	EA5RI	- / -1	2	✓ Closing fragment
09-15 21:11	40m	- / -	IW0RGU	-10 / -	2	✓ Closing fragment
09-15 21:08	40m	-18 / -9	TA7MMI	-16 / -	3	✓ Closing observed
09-15 21:04	40m	-21 / -3	EB7FSB	-18 / +1	4	✓ Full exchange observed
09-15 21:02	40m	-12 / -	EA4HUQ	- / 0	2	Partial capture
09-15 21:00	40m	-20 / -	S51WX	- / -1	2	✓ Closing fragment
09-15 20:52	40m	-12 / +5	PE1PBQ	-9 / -	4	✓ Closing observed
09-15 20:47	40m	-7 / -	EA6AJT	-16 / -	4	✓ Closing observed
09-15 20:46	40m	-6 / -	CT1ETX	- / -1	2	✓ Closing fragment
09-15 20:37	40m	-22 / -	EA4IXY	- / -5	2	Partial capture
09-15 20:32	40m	-4 / -	S55A	- / -	2	✓ Closing fragment
09-15 20:28	40m	-1 / -	M0CTI	-3 / +6	2	✓ Closing observed
09-15 20:26	40m	-8 / -	M7NGJ	- / -13	3	✓ Closing fragment
09-15 20:23	40m	-7 / -3	LB5AK	-18 / +3	4	✓ Full exchange observed
09-15 20:04	40m	+4 / -13	R5AV	+13 / -9	4	✓ Full exchange observed
09-15 03:58	40m	-11 / -13	SM7TZK	-7 / -1	10	✓ Full exchange observed
09-15 03:54	40m	0 / -	UR5ZGY	- / +3	3	✓ Closing fragment
09-15 03:52	40m	-7 / -	W4WFC	- / -	2	Partial capture
09-15 03:51	40m	-8 / -	SQ3LMR	- / -	2	Partial capture
09-15 01:43	40m	-5 / -	AA6AA	- / -	6	Partial capture
09-15 01:42	40m	-2 / -	EI4GAB	- / -	2	Partial capture
09-13 21:04	40m	-7 / -11	M0XUE	-4 / -4	3	✓ Full exchange observed
09-13 21:03	40m	- / -7	CT2HEX	-8 / -	3	✓ Closing fragment
09-13 21:02	40m	-4 / -	K4RUM	- / -2	2	Partial capture
09-13 21:00	40m	-6 / -	IK0MIB	- / -	4	✓ Closing fragment
09-13 20:54	40m	0 / -	R5QO/QRP	- / +3	2	Partial capture
09-13 20:50	40m	-2 / -	OZ7CL	- / -15	4	✓ Closing fragment
09-13 20:09	40m	-8 / -17	OZ/DG4BRT	-23 / -7	3	Partial capture
09-13 20:07	40m	-9 / -	PA0RDT	- / +3	3	✓ Closing fragment
09-13 20:06	40m	-4 / -	R8OAE	- / -	2	Partial capture
09-13 20:03	40m	-4 / -	M1EAG	-5 / -	5	✓ Closing observed
09-13 20:01	40m	-10 / -	EA5BF	-9 / -4	4	✓ Closing observed
09-13 19:57	40m	-8 / 0	IV3BHD	+9 / +3	5	✓ Full exchange observed
09-13 19:55	40m	-9 / -	EA5GQB	- / +7	2	✓ Closing fragment
09-13 19:53	40m	-7 / -	MW6YPO	- / -2	4	✓ Closing fragment
09-13 19:51	40m	-8 / -	G0LZX	- / +3	2	✓ Closing fragment
09-13 19:44	40m	-2 / -12	RA1TI	-1 / -11	11	✓ Full exchange observed
09-13 19:42	40m	0 / +5	SV8/F6BLP	-12 / +7	3	Partial capture
09-13 19:40	40m	-2 / -	DL4VBU	+3 / -	2	✓ Closing observed
09-13 19:36	40m	-10 / -	M8NMK	- / +10	3	Partial capture
09-13 19:28	40m	-4 / -	II0CDS	- / +9	2	✓ Closing fragment
09-13 19:27	40m	+1 / -	M8NMK	- / -	2	Partial capture
09-13 19:25	40m	+4 / -	9A2AJ	+1 / -9	5	✓ Full exchange observed
09-13 19:23	40m	-2 / -12	IK5DET	0 / -5	4	✓ Full exchange observed
09-13 08:53	40m	- / -	DC7MA	-10 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
212415 -13 2178  M0BEW F5SJC R-11
212430 -11 2178  F5SJC M0BEW RR73
212445  -9 2179  M0BEW F5SJC 73
212715  -6  527  OS9T F5SJC JN05 (x2)
212815 -11 1102  PZ5RA F5SJC JN05 (x3)
213130  -9 2039  OR0A F5SJC JN05
213415 -16 1180  9A5MP F5SJC JN05 (x6)

20m

UTC    dB Audio  Message
163700  +2  558  CQ F5SJC JN05
163830  +6  558  HF5A F5SJC 73
164130  +7  556  CQ F5SJC JN05 (x5)
164430  -4  557  WV2B F5SJC -17 (x2)
164600  -1  558  CQ F5SJC JN05 (x5)
184200 -19 2280  SH7DEK F5SJC R+01

10m

UTC    dB Audio  Message
091645  -8  605  DH6DAO F5SJC R+19
091745 -13  605  SP4TZ F5SJC JN05 (x3)
093945  -9  398  OE5WRO F5SJC R+07 (x2)
100745 -15 1270  DM2DXA F5SJC JN05 (x2)
101315 -19 1270  SQ5WBW F5SJC -21
101345 -20 1270  OE5HHR F5SJC R+23 (x2)
112100 -21 1480  PD0MNF F5SJC R-09 (x2)
094415  -6 2326  F5SJC <...> -20 (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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