F5SJF — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: JN08

Receiver-side FT8 activity involving F5SJF, decoded by SO8OO in southeastern Poland. 3,012 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 66 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-21.

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 3,012 FT8 messages attributed to F5SJF as the transmitting token by decoded message structure across 66 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (83%), followed by 20 m (10%) and 40 m (6%). Most decodes (75%) fell within the six-hour window 23:00-05:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

3,012

Messages attributed

UTC dates decoded

394

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 2,509 40m · 191 20m · 295 10m · 17

First attributed message: 2026-06-06
Last attributed message: 2026-10-21 04:13 UTC

Observed FT8 message patterns

Attributed sample: 3,012 messages
Active dates: 66 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -22 to -4 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 949, moderate (-15 to -9 dB) 1,149, strong (≥ -8 dB) 914.

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 F5SJF in decoded directed-looking exchanges:

A9QHE/R · Bahrain ×12 N1WI · United States ×8 KE4EB · United States ×2 KF4CCG · United States ×2 ON1BH · Belgium ×2 ON4MAP · Belgium ×2 K1IP · United States K5WVF · United States KB1HY · United States KC1OWD · United States KT4DZ · United States LZ1GC · Bulgaria

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 F5SJF

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: JN08 · 2,261 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,514 km (approx.)
Last such locator decoded: 2026-10-21 04:13 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	F5SJF S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-21 04:12	80m	-7 / -	<...>	- / -	3	Partial capture
10-21 03:48	80m	0 / -	<...>	- / -	3	Partial capture
10-21 02:30	80m	-6 / -	BN9DCM	- / -	2	Partial capture
10-21 01:58	80m	0 / -	ZK3DAG	- / -	3	Partial capture
10-21 00:55	80m	-4 / -	HP2PVR	- / -	3	Partial capture
10-20 23:25	80m	-18 / -17	SV5DZR	-20 / -	4	✓ Closing observed
10-20 23:18	80m	-13 / -16	SV5DZR	-14 / -	2	Partial capture
10-17 21:06	80m	-17 / -	W4YHD	- / -	2	Partial capture
10-17 21:01	80m	-24 / -	W4YHD	- / -	2	Partial capture
10-12 03:19	80m	-14 / -	P61JZC	- / -	3	Partial capture
10-12 02:08	80m	-14 / -	VP2MAW	- / -	2	Partial capture
10-12 01:49	80m	-10 / -	VP2MAW	- / -	18	Partial capture
10-12 01:30	80m	-7 / -	VP2MAW	- / -	14	Partial capture
10-12 01:14	80m	-3 / -	PJ4/DH8BQA	- / -	3	Partial capture
10-11 01:58	80m	-7 / -	FH1RSA	- / -	3	Partial capture
10-10 18:19	80m	- / -	SP5ALV	-4 / -	8	Partial capture
10-10 18:18	80m	-9 / -	PE1LDS	- / -	3	Partial capture
10-10 05:35	80m	-21 / -16	DO1ANB	-24 / -12	3	Partial capture
10-10 04:18	80m	- / -	DO1OAS	-1 / -	3	Partial capture
10-10 04:17	80m	- / -17	EI4JFB	-16 / -	3	✓ Closing fragment
10-10 02:15	80m	-15 / -	H82WAZ	- / -	3	Partial capture
10-10 00:11	80m	-4 / -	DV9KFV/R	- / -	3	Partial capture
10-09 23:40	80m	-10 / -	S67TNL	- / -	3	Partial capture
10-09 22:57	80m	-7 / -	S67TNL	- / -	3	Partial capture
10-09 22:39	80m	-11 / -	S67TNL	- / -	2	Partial capture
10-09 20:49	80m	-16 / -	S67TNL	- / -	2	Partial capture
10-09 19:09	80m	-6 / -	5W7DUG	- / -	5	Partial capture
10-09 01:17	80m	-2 / -	8V9UNL	- / -	3	Partial capture
10-09 00:00	80m	-8 / -	OL900CO	- / -	62	Partial capture
10-08 22:39	80m	-6 / -	8O9ZHC/R	- / -	3	Partial capture
10-08 21:45	80m	-10 / -	RA6FCU/P	- / -	3	Partial capture
10-07 03:22	80m	-7 / -13	SV5/TF1OL	-9 / -	3	Partial capture
10-07 03:04	80m	-18 / -	WH7MFI	- / -	3	Partial capture
10-07 02:50	80m	-20 / -	HF1Z	- / -	13	Partial capture
10-07 02:37	80m	-13 / -	HF1Z	- / -	11	Partial capture
10-06 23:54	80m	-16 / -	D61ZGH	- / -	2	✓ Closing fragment
10-04 03:34	80m	-5 / -	WF7I	- / -17	3	Partial capture
10-04 03:24	80m	-6 / -	WF7I	- / -	3	Partial capture
10-04 02:03	80m	-4 / -	C5R	- / -	2	Partial capture
10-04 00:16	80m	-9 / -	K6UFO	- / -	4	✓ Closing fragment
10-03 23:22	80m	-9 / -	TT9OFR	- / -	4	Partial capture
10-03 03:09	80m	-8 / -	D37OHH/R	- / -	2	Partial capture
10-03 02:22	80m	-7 / -	W4TV	- / -	3	Partial capture
10-03 01:47	80m	-8 / -	V26K	- / -	4	Partial capture
10-03 01:43	80m	- / -15	V26K	-4 / -	2	✓ Closing fragment
10-03 01:16	80m	-5 / -	V26K	- / -	2	Partial capture
10-03 00:56	80m	-10 / -	V26K	- / -	2	Partial capture
10-03 00:41	80m	-8 / -	V26K	- / -	2	Partial capture
10-03 00:37	80m	-12 / -	V26K	- / -	2	Partial capture
10-03 00:29	80m	-12 / -	V26K	- / -	5	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
232615 -17 1510  SV5DZR F5SJF RR73
005500  -2 2382  HP2PVR F5SJF JN08 (x3)
015845  +3 1302  ZK3DAG F5SJF JN08 (x3)
023015  -6 1503  BN9DCM F5SJF JN08 (x2)
034815  -3  788  <...> F5SJF JN08 (x6)

60m

UTC    dB Audio  Message
060245 -17 1008  F5SJF SP3IPA JO82 (x2)
201315 -23 1884  F5SJF OH2DOF KP20

40m

UTC    dB Audio  Message
033330  -3 1866  WD4SRC F5SJF JN08 (x4)
033545  -1 1865  Z34K F5SJF JN08 (x7)
034030  +3 1865  F5SJF Z34K -04
034045  -4 1865  Z34K F5SJF R-06
034100  -5 1865  F5SJF Z34K RR73
034115  +0 1865  Z34K F5SJF 73

20m

UTC    dB Audio  Message
032200 -18 1435  YV5AEZ F5SJF RR73
034500 -21 1674  KT4DZ F5SJF JN08 (x4)
054315  -2 1856  VK7DG F5SJF JN08 (x3)
080645  -9 2071  VK6BAD F5SJF JN08 (x2)
142345  +8  525  RI1FJL F5SJF JN08 (x5)

10m

UTC    dB Audio  Message
082600 -23 1742  R2FDS F5SJF R-10
153945  -9  388  T77RN F5SJF JN08

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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