DD4JK — 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: JO31

Receiver-side FT8 activity involving DD4JK, decoded by SO8OO in southeastern Poland. 23 FT8 messages attributed to this token as transmitter, on 40m, 10m, across 4 UTC dates in the available aggregate history. Observed between 2026-07-05 and 2026-10-30.

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 23 FT8 messages attributed to DD4JK as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (87%), followed by 10 m (13%). Several six-hour UTC windows tied for the largest share (57%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -16 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-16 dB

Estimated median S/N

Bands

40m · 20 10m · 3

First attributed message: 2026-07-05
Last attributed message: 2026-10-30 06:19 UTC

Observed FT8 message patterns

Attributed sample: 23 messages
Active dates: 4 UTC dates
Estimated median S/N: -16 dB
Estimated 10th-90th percentile: -23 to -12 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 12, moderate (-15 to -9 dB) 11, strong (≥ -8 dB) 0.

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 DD4JK in decoded directed-looking exchanges:

EX7CQ · Kyrgyzstan ×2 DL8NW · Fed. Rep. of Germany CR5VP · Portugal LZ1ZF · Bulgaria 9A5E · Croatia DL5AWR · Fed. Rep. of Germany F5RRS · France IU2HUQ · Italy N8HRZ · United States S56KO · Slovenia DK3JW · Fed. Rep. of Germany F5RMK · France

Most frequent locator attributed to DD4JK

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: JO31 · 12 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,054 km (approx.)
Last such locator decoded: 2026-10-30 06:19 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	DD4JK S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-05 17:06	60m	- / -	SP2EWQ	+1 / -	3	Partial capture
11-05 17:01	60m	- / -	SP2EWQ	-12 / -	2	Partial capture
11-05 16:55	60m	- / -9	DK3JW	+4 / -	8	✓ Closing fragment
11-05 16:54	60m	- / +6	F5RMK	-5 / -	2	✓ Closing fragment
10-30 06:07	40m	-16 / -5	9A5E	0 / -	4	✓ Closing observed
10-30 06:03	40m	-12 / -	PV8AJ	- / -17	4	Partial capture
10-19 19:23	40m	-23 / -23	EX7CQ	-12 / -15	7	✓ Full exchange observed
09-19 23:11	40m	-20 / -19	EX7CQ	0 / -9	6	✓ Full exchange observed
09-19 22:37	40m	-15 / -	EX7CQ	- / -	2	Partial capture
08-15 21:13	40m	- / -2	DL5AWR	-8 / -	3	✓ Closing fragment
08-15 21:11	40m	- / -1	IU2HUQ	-14 / -	2	✓ Closing fragment
08-15 21:07	40m	- / -	F5RRS	-12 / -	2	✓ Closing fragment
08-15 21:05	40m	- / -	S56KO	+1 / -	2	✓ Closing fragment
08-15 20:47	160m	- / -17	DL8NW	+5 / -	3	✓ Closing fragment
08-15 20:35	60m	- / -3	G3UHU	-8 / -	4	✓ Closing fragment
08-15 20:34	60m	- / -9	LY8O	-2 / -	3	✓ Closing fragment
08-14 17:08	20m	- / -1	CR5VP	-13 / -	2	✓ Closing fragment
08-14 14:49	20m	- / -9	LZ1ZF	-14 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
165515  -5 2285  DD4JK F5RMK RR73
165545  +2 2285  DD4JK DK3JW JN67 (x8)
170145 -11 1403  DD4JK SP2EWQ JO93 (x2)
170615  +2 2540  DD4JK SP3EPK RR73
170645  +0 2540  DD4JK SP2EWQ JO93 (x3)

40m

UTC    dB Audio  Message
192545 -24 1756  EX7CQ DD4JK R-15 (x2)
192700 -12 1757  DD4JK EX7CQ RR73 (x2)
060300 -12 1445  PV8AJ DD4JK R-17 (x4)
060715 -18  707  9A5E DD4JK JO31
060730  -1  706  DD4JK 9A5E -05 (x2)
060815 -15  706  9A5E DD4JK 73
061615 -19 1445  DD4JK PV8AJ -15
061930 -11  511  W4VPK DD4JK JO31
062800 -12 1072  DD4JK ZL4AS -12

160m

UTC    dB Audio  Message
204715  +0  838  DD4JK DL8NW -17 (x3)

20m

UTC    dB Audio  Message
103530 -19 1177  DD4JK CR7BUJ -15
144945 -16 1218  DD4JK LZ1ZF -09 (x2)
170845 -13  731  DD4JK CR5VP -01 (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

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