DM4SB — 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: JN58

Receiver-side FT8 activity involving DM4SB, decoded by SO8OO in southeastern Poland. 93 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-24 and 2026-10-21.

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 93 FT8 messages attributed to DM4SB as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (98%), followed by 20 m (2%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. 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

80m · 91 20m · 2

First attributed message: 2026-06-24
Last attributed message: 2026-10-21 21:09 UTC

Observed FT8 message patterns

Attributed sample: 93 messages
Active dates: 9 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -22 to -6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 33, moderate (-15 to -9 dB) 44, strong (≥ -8 dB) 16.

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 DM4SB in decoded directed-looking exchanges:

9A3AUH · Croatia CN8NS · Morocco F4DIA · France F4HPW · France G3VCQ · England IK2JYT · Italy IK5IVP · Italy LA1K · Norway UA3SNB · European Russia DA6LRW · Fed. Rep. of Germany DF2JK · Fed. Rep. of Germany DK0ACI · 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 DM4SB

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: JN58 · 46 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 799 km (approx.)
Last such locator decoded: 2026-10-21 21:09 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	DM4SB S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-21 21:09	80m	-12 / -16	T77RN	-2 / -	2	Partial capture
10-21 21:06	80m	-10 / -11	HA1SU	+18 / +4	4	✓ Full exchange observed
10-21 20:59	80m	-15 / -	DL2FM	- / -	2	Partial capture
10-21 20:55	80m	-14 / -14	ON4DXL	+9 / -5	3	✓ Full exchange observed
10-21 20:50	80m	- / -7	LA4NM	0 / -	2	Partial capture
10-21 20:43	80m	-8 / -13	SP5BB	+10 / -10	5	✓ Full exchange observed
10-14 17:11	80m	-11 / +3	DL8NW	+5 / 0	4	Partial capture
10-14 17:09	80m	-10 / -8	DO2NM	+11 / -1	5	✓ Full exchange observed
10-07 20:17	80m	- / -12	SP9UPV	-5 / -	2	✓ Closing fragment
10-07 20:13	80m	-6 / -9	SQ5ANT	+5 / -	3	✓ Closing observed
10-07 20:06	80m	-14 / -	ON5YT	-1 / -4	4	✓ Closing observed
10-07 20:01	80m	-10 / -12	IN3IBW	+9 / -3	3	Partial capture
10-07 19:58	80m	-18 / -	TF4M	- / -	2	✓ Closing fragment
10-07 19:55	80m	+1 / -14	YO2UKG	+12 / -5	3	✓ Full exchange observed
10-07 19:53	80m	-13 / -16	IQ9SZ/7	+2 / -9	4	Partial capture
09-09 20:08	80m	-18 / -3	SQ100PKP	+19 / +3	3	Partial capture
09-09 20:07	80m	-14 / -	OZ7CL	-9 / -8	3	✓ Closing observed
09-09 19:58	80m	-21 / -	DA6LRW	- / -10	3	✓ Closing fragment
09-09 19:54	80m	-20 / -11	4U1A	-8 / -22	4	Partial capture
09-09 19:41	80m	-10 / -6	SM7/DL5BTE	+7 / -3	3	Partial capture
09-09 19:08	80m	-8 / -20	RK2A	+12 / -5	8	✓ Full exchange observed
08-20 21:36	80m	-13 / -3	DO4LC	-10 / +5	5	✓ Full exchange observed
08-20 19:29	80m	-19 / -10	DL5VEN	-8 / -	2	✓ Closing observed
08-20 19:27	80m	- / -16	DF2JK	-16 / -	2	✓ Closing fragment
08-20 19:24	80m	-14 / -14	HA3GO	+1 / -1	5	✓ Full exchange observed
08-20 19:21	80m	-24 / -17	OL900CO	+7 / -	2	Partial capture
08-20 19:06	80m	-13 / -19	DK0ACI	-7 / -7	4	✓ Full exchange observed
08-15 15:03	20m	- / -11	<...>	-7 / -	2	Partial capture
08-12 20:48	80m	+2 / 0	DR800WE	+10 / +8	3	Partial capture
08-12 20:46	80m	-8 / -	LZ1GC	- / -	3	Partial capture
08-12 19:50	20m	- / -15	HB9EKJ	-18 / -	4	Partial capture
08-12 19:45	20m	- / -7	IK2JYT	-10 / -	2	✓ Closing fragment
08-10 21:06	20m	- / -9	IK5IVP	-7 / -	2	✓ Closing fragment
08-10 20:06	20m	- / -8	9A3AUH	0 / -	2	✓ Closing fragment
08-10 19:37	20m	- / -12	UA3SNB	-18 / -	2	✓ Closing fragment
08-10 18:20	20m	- / -15	F4HPW	-12 / -	2	✓ Closing fragment
08-10 18:11	20m	- / -15	CN8NS	-16 / -	4	✓ Closing fragment
08-10 18:06	20m	- / -13	G3VCQ	-10 / -	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
204415  +9 2610  DM4SB SP5BB RR73
204430  -8 2610  SP5BB DM4SB 73
205015  -2 2038  DM4SB LA4NM -07 (x2)
205530  +9 2528  DM4SB ON4DXL -14
205545 -17 2528  ON4DXL DM4SB R-05 (x2)
205915 -18 1319  DL2FM DM4SB JN58 (x2)
210630 -10  754  HA1SU DM4SB JN58
210645 +18  754  DM4SB HA1SU -11
210700  -9  755  HA1SU DM4SB R+04
210715 +19  754  DM4SB HA1SU RR73
210945 -12  656  T77RN DM4SB JN58
211130  -2  656  DM4SB T77RN -16

20m

UTC    dB Audio  Message
185200 -12  901  GM3AND DM4SB JN58
185300 -14 1473  LA7DMA DM4SB JN58
190630 -15 1366  DM4SB OZ7CL -12
192015 -21  982  DM4SB F4DIA RR73
194530 -11 1024  DM4SB IK2JYT -07 (x2)
195015 -19 1564  DM4SB HB9EKJ -15 (x4)
200000 +11 2809  DM4SB DG2BWG -12
150330  -7 2896  DM4SB <...> -11 (x2)
183930  +1 2153  DM4SB LA1K RR73
190115  -8  882  DM4SB MM0TBH -04

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

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