DO4UM — 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: JO63

Receiver-side FT8 activity involving DO4UM, decoded by SO8OO in southeastern Poland. 214 FT8 messages attributed to this token as transmitter, on 160m, 80m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-07 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 214 FT8 messages attributed to DO4UM as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (68%), followed by 160 m (32%). Several six-hour UTC windows tied for the largest share (68%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (89%); the estimated median was +2 dB.

Overview

214

Messages attributed

UTC dates decoded

Active 15-min windows

+2 dB

Estimated median S/N

Bands

160m · 68 80m · 146

First attributed message: 2026-06-07
Last attributed message: 2026-10-21 06:23 UTC

Observed FT8 message patterns

Attributed sample: 214 messages
Active dates: 8 UTC dates
Estimated median S/N: +2 dB
Estimated 10th-90th percentile: -9 to +13 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 190.

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 DO8XC · Fed. Rep. of Germany F4GGS · France G4IRN · England LA1UW · Norway PA3DUU · Netherlands 2W0YOX · Wales DG1FK · Fed. Rep. of Germany DL/AD2LX · Fed. Rep. of Germany DL2YBG · Fed. Rep. of Germany DO7RMS · 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 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 · 149 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 723 km (approx.)
Last such locator decoded: 2026-10-21 06:23 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
10-21 06:22	80m	+4 / -	K0KP	- / -	4	Partial capture
10-21 06:21	80m	- / -	DK7ZT	+5 / -	5	Partial capture
10-21 06:19	80m	+12 / -	N1WI	- / -22	5	✓ Closing fragment
10-21 06:18	80m	+14 / -	KD4EBL	- / -	2	Partial capture
10-21 05:56	80m	0 / -	DA125RH	+2 / +4	3	Partial capture
10-21 05:55	80m	- / -	DO5AX	-21 / -	2	Partial capture
10-21 05:51	80m	-3 / -	KF8EXX	- / -	7	Partial capture
10-21 05:49	80m	+7 / -	2W0YOX	- / -13	3	✓ Closing fragment
10-21 05:46	80m	+8 / -	ES5PC	-5 / -12	3	✓ Closing observed
10-21 05:44	80m	+6 / -	DL2YBG	-4 / +3	3	✓ Closing observed
10-21 05:43	80m	- / -	DK7ZT	+13 / -	5	Partial capture
10-21 05:40	80m	+15 / -	P4/WE9V	- / -17	5	Partial capture
10-21 05:38	80m	+5 / -	DJ7M	- / -	3	Partial capture
09-29 06:43	80m	- / -	DM2GG	-2 / -	6	Partial capture
09-29 06:41	80m	+19 / -	MW0DNF	- / -	3	Partial capture
09-29 06:39	80m	+2 / -	OZ1KHA	- / -	2	Partial capture
09-29 06:12	80m	+5 / -	M9HEB	- / -6	3	✓ Closing fragment
09-29 06:11	80m	+9 / -2	DO7RMS	-1 / -	4	✓ Closing observed
09-29 06:09	80m	+8 / -	DG1FK	-6 / -7	4	✓ Full exchange observed
09-29 06:08	80m	- / -	DK7ZT	+2 / -	5	Partial capture
09-29 06:05	80m	-1 / +7	DL/AD2LX	-12 / -5	8	✓ Full exchange observed
09-29 06:02	80m	+12 / -	SP5DFK/QRP	- / -	4	Partial capture
09-29 06:00	80m	+5 / -	OZ1KHA	- / -	2	Partial capture
09-29 05:58	160m	-6 / -	DH8KAM	- / -	2	Partial capture
09-29 05:56	160m	-7 / -17	F4GGS	-12 / 0	5	✓ Full exchange observed
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

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
061830 +14  442  KD4EBL DO4UM JO63
061900 +15  442  N1WI DO4UM JO63 (x5)
062115  +4  826  DO4UM DK7ZT +17 (x2)
062215  +4 1292  K0KP DO4UM JO63
062215  +7  826  DO4UM DK7ZT +17
062245  +5 2251  K0KP DO4UM JO63
062245  +6  826  DO4UM DK7ZT +17
062315  +3 2251  K0KP DO4UM JO63
062315  +5  826  DO4UM DK7ZT +17
062345  +4 2251  K0KP DO4UM JO63

160m

UTC    dB Audio  Message
200200  -5 1102  DG4BZ DO4UM 73
200345  -7 1710  M3ZZF DO4UM JO63 (x4)
055400  -6 2208  CQ DO4UM JO63 (x3)
055600 -10 2208  F4GGS DO4UM JO63
055615 -11  920  DO4UM F4GGS -17
055630  -7 1139  F4GGS DO4UM R+00
055645 -12  920  DO4UM F4GGS RR73
055700  -4 1171  F4GGS DO4UM 73
055800  -7 1171  DH8KAM DO4UM JO63 (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