F4JDC — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: France Most frequent locator attributed to this token: JO00

Receiver-side FT8 activity involving F4JDC, decoded by SO8OO in southeastern Poland. 29 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-09 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 29 FT8 messages attributed to F4JDC as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (45%), followed by 10 m (34%) and 20 m (21%). Several six-hour UTC windows tied for the largest share (66%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

40m · 13 20m · 6 10m · 10

First attributed message: 2026-06-09
Last attributed message: 2026-09-12 07:04 UTC

Observed FT8 message patterns

Attributed sample: 29 messages
Active dates: 7 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -19 to -1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 8, moderate (-15 to -9 dB) 13, strong (≥ -8 dB) 8.

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 F4JDC in decoded directed-looking exchanges:

DL3KZA · Fed. Rep. of Germany F1PSX · France HA1BF · Hungary OK1DBE · Czech Republic SV5BYP · Dodecanese DL8WEM · Fed. Rep. of Germany F5RRS · France F6BEC · France HA7TM · Hungary SP4GDW · Poland SP9UPH · Poland US8KA · Ukraine

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 F4JDC

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: JO00 · 17 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,476 km (approx.)
Last such locator decoded: 2026-09-12 07:03 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	F4JDC S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 08:53	40m	- / -19	SP4GDW	-13 / -	3	✓ Closing fragment
09-20 08:42	40m	- / -11	DK4RH	-18 / -	2	Partial capture
09-17 08:31	40m	- / -17	HA7TM	+4 / -	3	✓ Closing fragment
09-17 08:31	40m	- / -1	OE8PIT	-6 / -	5	Partial capture
09-12 07:05	40m	- / -22	IK4TVP	-14 / -	4	Partial capture
09-12 07:03	40m	-11 / -	DL8WEM	+2 / -	4	✓ Closing observed
09-12 07:00	40m	-14 / -	DK5EO	- / +5	3	Partial capture
09-12 06:50	40m	- / -19	SP9UPH	-8 / -	3	✓ Closing fragment
09-09 06:31	40m	-18 / -12	F5RRS	-9 / -	4	✓ Closing observed
08-09 07:47	40m	- / -14	US8KA	-22 / -	2	✓ Closing fragment
08-09 06:53	20m	- / -	RX3ASQ	-17 / -	2	Partial capture
07-20 09:45	20m	- / +8	F1PSX	-12 / -	2	✓ Closing fragment
07-20 09:41	20m	- / -1	DL3KZA	-2 / -	4	✓ Closing fragment
07-20 09:22	20m	- / -	DL1UDO	-11 / -	5	Partial capture
07-07 09:06	20m	- / -5	OK1DBE	-10 / -	3	✓ Closing fragment
06-27 09:54	20m	- / -	SV5BYP	-22 / -	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
070645 -14 1870  F4JDC IK4TVP -22
083115  -5  342  F4JDC OE8PIT JN66
083115  +5 1625  F4JDC HA7TM JN97
083145 -10  343  F4JDC OE8PIT JN66
083145  +4 1625  F4JDC HA7TM R-17 (x2)
083245  -2  342  F4JDC OE8PIT R-01 (x3)
084245 -18 1313  F4JDC DK4RH JO31 (x2)
084945 -15 1152  F4JDC F6BEC 73
085315 -13 1833  F4JDC SP4GDW -19 (x3)

20m

UTC    dB Audio  Message
092300 -11 1748  F4JDC DL1UDO JO31 (x3)
094100  -1 2520  F4JDC DL3KZA JO64 (x4)
094530 -12 1371  F4JDC F1PSX R+08 (x2)
091230 -24 2001  F4JDC UR5VPR KN68
105615 -17 1517  HA1BF F4JDC 73
065215 -24 1623  PS8ARP F4JDC JO00
065300 -15 1142  F4JDC RX3ASQ KO95 (x2)
073930  -7  565  F4JDC IU2THY JN45

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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