DM4JU — 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: 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 F8FUA · France DJ3HW · Fed. Rep. of Germany DL7EDU · Fed. Rep. of Germany HA1PB · Hungary HB9ELE · Switzerland OK1MAT · Czech Republic OU7M/P · Denmark PD1RP · Netherlands R2FEA · Kaliningrad R6DZR · European Russia S57MPU · Slovenia

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
10-05 16:30	40m	- / -16	HB9ELE	+9 / -	2	✓ Closing fragment
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

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
182715 -13 1042  OK1MAT DM4JU R-04 (x6)
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)
163030  +8  743  DM4JU HB9ELE -16 (x2)

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)

80m

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

20m

UTC    dB Audio  Message
112615 -15 3087  UB8CPH DM4JU JO62 (x2)
170615 +14  982  DM4JU F8FUA -12 (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.

CW

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

Explore CW reception at SO8OO

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee