DO4UM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO63

Receiver-side FT8 activity involving DO4UM, decoded by SO8OO in southeastern Poland. 146 FT8 messages attributed to this token as transmitter, on 160m, 80m, across 6 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-13.

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 146 FT8 messages attributed to DO4UM as the transmitting token by decoded message structure across 6 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (59%), followed by 160 m (41%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (86%); the estimated median was 0 dB.

Overview

146

Messages attributed

UTC dates decoded

Active 15-min windows

0 dB

Estimated median S/N

Bands

160m · 60 80m · 86

First attributed message: 2026-06-07
Last attributed message: 2026-09-13 20:12 UTC

Observed FT8 message patterns

Attributed sample: 146 messages
Active dates: 6 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -10 to +13 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 4, moderate (-15 to -9 dB) 17, strong (≥ -8 dB) 125.

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 DO4UM in decoded directed-looking exchanges:

DG4BZ · Fed. Rep. of Germany DJ3JD · Fed. Rep. of Germany DL4ABN · Fed. Rep. of Germany DO8XC · Fed. Rep. of Germany G4IRN · England LA1UW · Norway PA3DUU · Netherlands DA6IT · Fed. Rep. of Germany DJ4CH · Fed. Rep. of Germany DK7AC · Fed. Rep. of Germany EI4JFB · Ireland HB3YPJ · Switzerland

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 DO4UM

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: JO63 · 103 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 723 km (approx.)
Last such locator decoded: 2026-09-13 20:11 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	DO4UM S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-13 20:12	80m	- / -	DK7ZT	-8 / -	4	Partial capture
09-13 20:10	80m	+5 / -	HB3YPJ	- / -23	5	✓ Closing fragment
09-13 20:03	160m	-4 / -	M3ZZF	- / -	4	Partial capture
09-13 20:01	160m	-5 / -	DG4BZ	- / -8	3	✓ Closing fragment
09-13 19:58	160m	- / -	SP9UPH	+10 / -	2	Partial capture
09-13 19:56	160m	-6 / +2	DJ3JD	-11 / +5	5	✓ Full exchange observed
09-13 19:51	160m	0 / -	II0CDS	- / -	3	Partial capture
09-13 19:50	160m	+4 / -	EB3GHN	- / -	2	Partial capture
09-13 19:47	160m	-4 / -5	PA3DUU	-3 / -1	5	✓ Full exchange observed
09-13 19:44	160m	-10 / -	DL7MDX	- / -	2	Partial capture
09-13 19:42	160m	-4 / -	LA1UW	- / -12	3	✓ Closing fragment
09-13 19:40	160m	+7 / -	DL1RWN	- / -	2	Partial capture
09-13 19:37	160m	-5 / -	DO8XC	- / -6	5	✓ Closing fragment
09-13 19:35	160m	-3 / -	DL1RWN	- / -	4	Partial capture
09-13 19:30	160m	-7 / -	MW7GQB	- / -	3	Partial capture
09-13 19:28	160m	+3 / -1	G4IRN	-4 / +8	5	✓ Full exchange observed
09-13 19:26	80m	+15 / -	DJ7M	- / -	3	Partial capture
07-13 19:34	160m	-13 / -	JR3UIC	- / -	3	Partial capture
07-13 19:22	160m	-10 / -	JR3UIC	- / -	6	Partial capture
07-13 18:57	80m	+9 / -	<...>	- / -	3	Partial capture
07-13 18:52	80m	-5 / -	VU3CAU	- / -	5	Partial capture
07-13 18:41	80m	+2 / -	CX2CRV	- / -	4	Partial capture
07-13 18:38	80m	+5 / -	VK6ABC	- / -11	4	✓ Closing fragment
07-13 18:35	80m	-1 / -	CX2CRV	- / -	5	Partial capture
07-12 18:34	80m	-1 / -	DH8KAM	- / -	7	Partial capture
07-12 18:33	80m	+3 / +2	YT3BL	+10 / -	4	Partial capture
06-28 21:19	80m	+10 / +3	SP1EG	+11 / +2	3	✓ Full exchange observed
06-28 21:19	80m	- / -	DK7ZT	+6 / -	3	Partial capture
06-28 21:18	80m	+12 / +1	DJ4CH	+3 / +5	5	✓ Full exchange observed
06-28 21:09	80m	+15 / -17	RC6OD	+13 / 0	5	✓ Full exchange observed
06-28 21:06	80m	- / +9	DK7ZT	+2 / -	3	Partial capture
06-28 21:06	80m	- / -	UA4FKT	+12 / -	3	Partial capture
06-28 21:05	80m	+8 / +3	EI4JFB	-4 / -7	5	✓ Full exchange observed
06-22 21:01	80m	+13 / -	DA6IT	0 / +3	4	✓ Closing observed
06-22 20:58	80m	- / -	DL4KSD	+4 / -	2	Partial capture
06-22 20:58	80m	+4 / -5	DK7AC	-10 / -1	5	✓ Full exchange observed
06-22 20:50	160m	+7 / -	DL1RWN	- / -	6	Partial capture
06-22 20:49	160m	- / -	9A4ZM	-1 / -	3	Partial capture
06-22 20:47	160m	-3 / -6	DL4ABN	-15 / -3	4	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
185745 +10 1189  <...> DO4UM JO63 (x3)
192600 +12  329  DJ7M DO4UM JO63 (x3)
201030  +7 1929  HB3YPJ DO4UM JO63 (x5)
201245  -1 1115  DO4UM DK7ZT +12 (x4)

160m

UTC    dB Audio  Message
195445  +4  552  RU6C DO4UM JO63
195615  -7 1794  DJ3JD DO4UM JO63
195630 -11 1615  DO4UM DJ3JD +02
195645  -5 1794  DJ3JD DO4UM R+05
195700 -11 1615  DO4UM DJ3JD RR73
195715  -7 1794  DJ3JD DO4UM 73
195800  +8 2318  DO4UM SP9UPH JO90 (x2)
200100  -4 1102  DG4BZ DO4UM JO63 (x3)
200345  -7 1710  M3ZZF DO4UM JO63 (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.

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