DM4JU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO62

Receiver-side FT8 activity involving DM4JU, decoded by SO8OO in southeastern Poland. 84 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-07-12 and 2026-09-05.

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 84 FT8 messages attributed to DM4JU as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 60 m (63%), followed by 40 m (21%) and 20 m (15%). Most decodes (83%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

60m · 53 40m · 18 20m · 13

First attributed message: 2026-07-12
Last attributed message: 2026-09-05 18:13 UTC

Observed FT8 message patterns

Attributed sample: 84 messages
Active dates: 8 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -20 to -9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 35, moderate (-15 to -9 dB) 41, 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 DM4JU in decoded directed-looking exchanges:

LY8O · Lithuania ×2 F4LZK · France IK2DDR · Italy IU7VOL · Italy OH3OJ · Finland S51DM · Slovenia SV2HTW · Greece YO3OBB · Romania 9A5WA · Croatia F8FUA · France PD0WL · Netherlands RA3P · European Russia

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 DM4JU

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: JO62 · 33 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 675 km (approx.)
Last such locator decoded: 2026-08-26 18:26 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	DM4JU S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-14 17:32	60m	- / -21	SP9UPH	+10 / -	3	✓ Closing fragment
09-13 18:55	60m	- / -20	OZ1AXG	+10 / -	3	✓ Closing fragment
09-13 18:38	60m	- / -20	SP4WRI	-5 / -	3	✓ Closing fragment
09-13 18:37	60m	- / +3	LY8O	-5 / -	2	✓ Closing fragment
09-13 18:36	60m	- / -20	DK7ZT	-11 / -	4	Partial capture
09-13 18:34	60m	- / -25	OH5D	+1 / -	3	✓ Closing fragment
09-13 18:30	60m	- / -10	OZ9FF	0 / -	2	✓ Closing fragment
09-05 18:12	40m	-14 / -	HA1PB	- / -4	2	✓ Closing fragment
09-05 18:10	40m	-15 / -15	OU7M/P	0 / -3	3	✓ Full exchange observed
08-27 20:38	80m	- / -22	DL6MRM	-16 / -	3	✓ Closing fragment
08-26 18:26	40m	-12 / -	OK1MAT	-3 / -4	9	✓ Closing observed
08-26 18:21	40m	- / -6	S57MPU	+14 / -	2	✓ Closing fragment
08-26 17:53	40m	- / -15	SV7BAY	+4 / -	3	✓ Closing fragment
08-23 18:00	40m	-14 / -12	GB64MOD	+7 / -	3	Partial capture
08-23 17:57	40m	- / 0	DG6ITP	-11 / -	3	Partial capture
08-23 17:53	40m	-6 / -17	R6DZR	-8 / -4	5	✓ Full exchange observed
08-23 17:52	40m	- / -15	DJ3HW	-5 / -	2	✓ Closing fragment
08-23 17:06	20m	- / -12	F8FUA	+14 / -	2	✓ Closing fragment
08-23 11:26	20m	-15 / -	UB8CPH	- / -	2	Partial capture
08-11 08:52	40m	- / -14	DL7EDU	-18 / -	2	✓ Closing fragment
08-10 18:42	40m	- / -23	R2FEA	-4 / -	3	✓ Closing fragment
08-10 18:39	40m	- / -9	LY8O	-11 / -	2	✓ Closing fragment
08-10 18:33	40m	- / -11	PD1RP	-10 / -	2	✓ Closing fragment
08-10 15:34	40m	- / -13	SQ3TR	-16 / -	2	✓ Closing fragment
08-08 20:42	40m	- / -	SV1DKR	-18 / -	4	✓ Closing fragment
08-01 19:43	40m	- / -	SP8NI	-18 / -	4	Partial capture
07-29 20:53	60m	- / -6	SO3O	+2 / -	2	✓ Closing fragment
07-29 20:48	60m	- / -18	DK3ME	-4 / -	4	✓ Closing fragment
07-29 20:47	60m	- / -16	OK2EA	+8 / -	2	✓ Closing fragment
07-28 23:13	60m	-19 / -21	G0AZH	0 / -2	15	✓ Full exchange observed
07-28 23:13	60m	- / -15	PA0RF	-6 / -	3	Partial capture
07-28 20:33	60m	-17 / +6	LA4GHA	-5 / 0	4	✓ Full exchange observed
07-28 20:30	60m	- / -5	8S7DL	-2 / -	3	✓ Closing fragment
07-28 19:58	60m	-12 / -	PA3DII	- / -13	3	✓ Closing fragment
07-28 19:57	60m	- / -9	SQ2BXI	-9 / -	3	✓ Closing fragment
07-28 19:55	60m	-14 / -10	DD6ZV	-4 / -1	6	✓ Full exchange observed
07-28 19:50	60m	- / -4	OM1AGE	+2 / -	4	✓ Closing fragment
07-28 19:49	60m	- / -12	SN1A	-1 / -	3	✓ Closing fragment
07-28 19:47	60m	-12 / -1	ES8JX	+4 / -	4	✓ Closing observed
07-28 19:43	60m	-12 / -4	SQ2BXI	-7 / -12	7	Partial capture
07-28 19:41	60m	-16 / -1	DL9NEI	+5 / +2	3	✓ Full exchange observed
07-28 19:38	60m	-20 / -	IU3TAI	-20 / -11	4	✓ Closing observed
07-28 19:35	60m	-16 / -5	DL9OE	-8 / +3	6	✓ Full exchange observed
07-28 19:32	60m	- / -	DL9OE	-12 / -	3	Partial capture
07-28 19:32	60m	-15 / -17	SM2OTU	-11 / -12	5	✓ Full exchange observed
07-28 19:30	60m	-14 / 0	LA2FCA	-18 / -9	4	✓ Full exchange observed
07-28 19:23	60m	-8 / +2	HA7TM	+13 / -	4	✓ Closing observed
07-28 19:23	60m	-13 / -21	ON7KEI	-18 / -1	6	✓ Full exchange observed
07-28 19:16	60m	-19 / -	SP6TRK	-14 / -	4	✓ Closing observed
07-28 19:13	60m	-12 / -14	G4HUE	-4 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
183615 -10 1901  DM4JU DK7ZT -20 (x3)
183745  -8 1383  DM4JU LY8O +03
183745  -8 1900  DM4JU DK7ZT -20
183815  -4 1051  DM4JU SP4WRI -20
183815  -2 1383  DM4JU LY8O RR73
183845  -5 1051  DM4JU SP4WRI -20 (x2)
185530 +10 2436  DM4JU OZ1AXG -20 (x3)
173245  +8 2505  DM4JU SP9UPH JO90 (x3)

40m

UTC    dB Audio  Message
182515 -17 1042  DL7HS DM4JU JO62
182645 -11 1042  OK1MAT DM4JU JO62 (x7)
183200  -5 1742  DM4JU OK1MAT RR73 (x2)
181015  +1  856  DM4JU OU7M/P -15
181030 -15  857  OU7M/P DM4JU R-03
181045  -2  856  DM4JU OU7M/P RR73
181230 -16 2440  HA1PB DM4JU R-04 (x2)

80m

UTC    dB Audio  Message
203815 -15 1190  DM4JU DL6MRM -22 (x3)

20m

UTC    dB Audio  Message
164945 -12 1037  DM4JU F4LER -19 (x3)
170230  +2  778  DM4JU RA3P -08 (x3)
170915  +3 2559  DM4JU 9A5WA -15 (x2)
085300  -6  824  DM4JU Z62NS +14 (x2)
085415 -16  824  Z62NS DM4JU 73
112615 -15 3087  UB8CPH DM4JU JO62 (x2)
170615 +14  982  DM4JU F8FUA -12 (x2)

10m

UTC    dB Audio  Message
100800 -18 1529  DM4JU RC5F KO85
120545  -6 1720  DM4JU <...> +17
161045  -9 2466  DM4JU IU7VOL -01 (x2)
161215 -14 1377  DM4JU F4LZK +04 (x2)
164745 -18  700  DM4JU S51DM RR73
114045  -6  728  DM4JU SV2HTW RR73
192745 -17 1549  DM4JU YO3OBB +01 (x2)
090830  -3  494  DM4JU OH3OJ -11 (x2)
073800  -5 1341  DM4JU IK2DDR -06 (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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