W5CJF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM25

Receiver-side FT8 activity involving W5CJF, decoded by SO8OO in southeastern Poland. 35 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-08-06 and 2026-08-27.

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 35 FT8 messages attributed to W5CJF as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -12 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

20m · 35

First attributed message: 2026-08-06
Last attributed message: 2026-08-27 23:06 UTC

Observed FT8 message patterns

Attributed sample: 35 messages
Active dates: 2 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -21 to -5 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 10, moderate (-15 to -9 dB) 16, strong (≥ -8 dB) 9.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with W5CJF in decoded directed-looking exchanges:

4X5MZ · Israel CN8NS · Morocco EA5D · Spain EI9KF · Ireland G8OO · England R1CAT · European Russia SP6AXW · Poland SV5BYP · Dodecanese YO6LM · Romania Z62NS · Republic of Kosovo

Most frequent locator attributed to W5CJF

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: EM25 · 11 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,671 km (approx.)
Last such locator decoded: 2026-08-27 23:06 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	W5CJF S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-27 23:04	20m	-8 / -	RI1FJL	- / -	4	Partial capture
08-27 01:49	20m	-4 / -	RI1FJL	- / -	2	Partial capture
08-06 04:16	20m	-12 / -	RA3FY	- / -12	2	Partial capture
08-06 04:14	20m	- / -	R7WA	-5 / -	2	Partial capture
08-06 04:14	20m	-10 / -	PJ2VR	- / +4	2	Partial capture
08-06 04:11	20m	-18 / -14	4X5MZ	+4 / -	3	✓ Closing observed
08-06 04:09	20m	- / -	R7WA	-12 / -	2	Partial capture
08-06 04:08	20m	-16 / -	YO6LM	- / -12	2	✓ Closing fragment
08-06 04:07	20m	-15 / -	SP6AXW	- / -6	2	✓ Closing fragment
08-06 04:06	20m	- / -	RM6LW	+16 / -	8	Partial capture
08-06 03:58	20m	-12 / -	CN8NS	- / -21	2	✓ Closing fragment
08-06 03:56	20m	-5 / -	EA5D	- / -11	2	✓ Closing fragment
08-06 03:53	20m	-13 / -	NL8F	- / -18	2	Partial capture
08-06 03:48	20m	-21 / -	EI9KF	- / -16	3	✓ Closing fragment
08-06 03:46	20m	-20 / -	UB8CPH	- / -12	2	Partial capture
08-03 19:47	20m	- / -24	Z62NS	-12 / -	4	✓ Closing fragment
07-13 02:23	20m	- / -12	UA6HBJ	-12 / -	3	Partial capture
07-13 02:18	20m	- / -2	SV5BYP	-14 / -	2	✓ Closing fragment
07-13 02:17	20m	- / -	R2AL	+3 / -	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
041430 -10 2537  PJ2VR W5CJF R+04
041445  -5 1942  W5CJF R7WA LN32
041545  -1 2536  W5CJF UA4FKT LO23
041600 -12 2538  RA3FY W5CJF -12 (x2)
041845 -10 2634  UN7EAX W5CJF R-12
042045 -12 2634  Z34K W5CJF -15
042330  -1 2634  W5CJF UA4FKT LO23
014115  -7  664  RI1FJL W5CJF R-13 (x7)

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