DK4FJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO40

Receiver-side FT8 activity involving DK4FJ, decoded by SO8OO in southeastern Poland. 66 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-15 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 66 FT8 messages attributed to DK4FJ as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (39%), followed by 40 m (36%) and 80 m (17%). Most decodes (62%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -16 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-16 dB

Estimated median S/N

Bands

160m · 5 80m · 11 40m · 24 20m · 26

First attributed message: 2026-06-15
Last attributed message: 2026-09-12 06:28 UTC

Observed FT8 message patterns

Attributed sample: 66 messages
Active dates: 13 UTC dates
Estimated median S/N: -16 dB
Estimated 10th-90th percentile: -18 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 36, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 7.

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 DK4FJ in decoded directed-looking exchanges:

DO2RG · Fed. Rep. of Germany ×2 PA3FR · Netherlands CT3MD · Madeira Islands EB5DFU · Spain IU5TPM · Italy ON1JP · Belgium R0AX · Asiatic Russia DF9DL · Fed. Rep. of Germany DH5BM · Fed. Rep. of Germany DK0KG · Fed. Rep. of Germany DL6UCK · Fed. Rep. of Germany DL6UM · Fed. Rep. of Germany

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 DK4FJ

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: JO40 · 36 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 911 km (approx.)
Last such locator decoded: 2026-09-12 06:28 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	DK4FJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-18 05:55	80m	- / -7	DO1FZL	-8 / -	4	Partial capture
09-17 14:23	40m	- / -15	DF9DL	-18 / -	3	✓ Closing fragment
09-12 06:30	40m	- / -13	EA3AKY	-16 / -	2	Partial capture
09-12 06:25	40m	- / -19	EA2DYB	-12 / -	3	✓ Closing fragment
09-11 19:58	160m	-16 / -8	DO2RG	-6 / -	11	✓ Closing observed
09-11 17:48	80m	- / -15	DL2YBG	-6 / -	5	✓ Closing fragment
09-11 17:44	80m	- / -	DO2KMB	-2 / -	2	Partial capture
09-11 16:16	40m	- / -	DL9KM	-5 / -	7	Partial capture
09-11 16:15	40m	- / -	DJ0MAB	0 / -	2	Partial capture
09-11 16:14	40m	-7 / -6	ON4AOI	+12 / +5	5	✓ Full exchange observed
09-11 16:12	40m	-10 / -	UB3BDJ/6	- / -10	2	Partial capture
09-11 14:11	40m	-19 / -	F1PBZ	- / +4	2	✓ Closing fragment
09-10 09:22	40m	- / -	SH7MEM	-7 / -	5	Partial capture
09-10 09:18	40m	- / -	DG9ZL	-11 / -	2	Partial capture
09-07 19:38	160m	- / -18	PA3FR	-2 / -	3	✓ Closing fragment
09-07 19:34	160m	- / -	UT4WT	+12 / -	10	Partial capture
09-07 19:31	80m	- / -	DK0KG	-7 / -	3	Partial capture
09-07 19:11	40m	- / -7	F6BEC	-3 / -	3	✓ Closing fragment
09-07 18:58	40m	- / -	PA1RGX	0 / -	3	Partial capture
09-07 18:57	40m	-15 / +1	OE8PIT	+3 / -9	4	✓ Full exchange observed
09-07 17:42	40m	- / -2	DK0KG	-9 / -	3	✓ Closing fragment
08-28 17:47	40m	- / -9	PA3GAE	-7 / -	3	✓ Closing fragment
08-28 17:18	40m	- / -3	DM2CNE	-4 / -	2	✓ Closing fragment
08-26 10:10	20m	- / -13	CT3MD	-5 / -	4	✓ Closing fragment
08-22 17:54	40m	- / -	DL1GLO	-2 / -	4	Partial capture
08-22 17:30	40m	- / -19	DM5JBN	0 / -	3	✓ Closing fragment
08-22 17:28	40m	- / -13	F1PBZ	-7 / -	3	Partial capture
08-20 14:28	20m	-8 / -	R0AX	-13 / 0	4	✓ Closing observed
08-20 06:01	20m	-9 / -	K4YT	- / -5	2	Partial capture
08-19 06:22	40m	- / -13	RN2F	-11 / -	4	✓ Closing fragment
08-19 05:38	40m	- / -11	OK1WCF	-10 / -	2	Partial capture
08-19 05:35	40m	- / -	DH5BM	-14 / -	2	✓ Closing fragment
08-19 05:31	40m	- / -10	DL6UM	-11 / -	5	✓ Closing fragment
08-19 05:26	40m	- / -	DL8WEM	-5 / -	3	✓ Closing fragment
08-17 20:01	80m	-17 / -	DH5BO	-1 / -18	3	Partial capture
08-17 18:33	40m	-18 / -	PA3DRQ	- / -	2	Partial capture
08-17 18:30	40m	-18 / -	PA3DRQ	- / -	2	Partial capture
07-29 16:44	20m	-16 / -10	R7MP	-7 / +9	5	Partial capture
07-29 16:03	20m	- / -4	F1PBZ	-9 / -	2	Partial capture
07-28 19:43	20m	-17 / +7	ON1JP	-8 / -	3	✓ Closing observed
07-28 08:56	20m	-14 / -	RU3QR	- / -6	5	Partial capture
07-28 08:31	20m	- / -	IU5TPM	-6 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
193100  -8 1401  DK4FJ DK0KG JN49 (x3)
174415  -2 1077  DK4FJ DO2KMB JO42 (x2)
174815  -3 1304  DK4FJ DL2YBG R-15 (x2)
174915 +14  976  DK4FJ DO9SAM JO61
174915  -4 1304  DK4FJ DL2YBG R-15 (x3)
055515 -10 2368  DK4FJ DO1FZL JO50 (x4)

40m

UTC    dB Audio  Message
161630 -11 1351  DK4FJ DL9KM JN68 (x6)
062515 -12  701  DK4FJ EA2DYB IN83 (x3)
062800 -16  700  CQ DK4FJ JO40
063045 -18 2071  DK4FJ EA3AKY JN01 (x2)
142315 -14 2405  DK4FJ DF9DL JO30 (x3)

160m

UTC    dB Audio  Message
193800  -1 1711  DK4FJ PA3FR JO33
193830 +12 1096  DK4FJ UT4WT KO20
193830  -2 1711  DK4FJ PA3FR R-18 (x2)
195815  -3 1456  DK4FJ DO2RG JO52 (x4)
200000 -16  970  DO2RG DK4FJ RRR
200015  -3 1456  DK4FJ DO2RG 73
200030 -17  970  DO2RG DK4FJ RRR
200045  -6 1456  DK4FJ DO2RG 73 (x4)

20m

UTC    dB Audio  Message
060200  -9 1187  K4YT DK4FJ -05
064515 -21 1187  DK4FJ IU0SIB R-01
085945 -10 1187  DK4FJ IZ4AIF JN54
142800 -10 2182  R0AX DK4FJ JO40 (x3)
142900 -11 2339  <DK4FJ> EA1/PE5X
142915 -13 2182  DK4FJ R0AX RR73
161230 -12 1596  CQ DK4FJ JO40 (x3)
101015  -7  991  DK4FJ CT3MD IM13 (x4)

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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