DD5SI — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO52

Receiver-side FT8 activity involving DD5SI, decoded by SO8OO in southeastern Poland. 321 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 16 UTC dates in the available aggregate history. Observed between 2026-06-19 and 2026-09-21.

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 321 FT8 messages attributed to DD5SI as the transmitting token by decoded message structure across 16 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (64%), followed by 20 m (17%) and 40 m (14%). Most decodes (77%) fell within the six-hour window 16:00-22:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (69%); the estimated median was -6 dB.

Overview

321

Messages attributed

UTC dates decoded

Active 15-min windows

-6 dB

Estimated median S/N

Bands

80m · 206 40m · 45 20m · 56 10m · 14

First attributed message: 2026-06-19
Last attributed message: 2026-09-21 17:00 UTC

Observed FT8 message patterns

Attributed sample: 321 messages
Active dates: 16 UTC dates
Estimated median S/N: -6 dB
Estimated 10th-90th percentile: -14 to +5 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 18, moderate (-15 to -9 dB) 82, strong (≥ -8 dB) 221.

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 DD5SI in decoded directed-looking exchanges:

IQ4JO · Italy ×2 RN6MA · European Russia ×2 9A4ZM · Croatia ×2 DL3MIB · Fed. Rep. of Germany ×2 LZ2VQ · Bulgaria ×2 OE6TNO · Austria ×2 DO5OT · Fed. Rep. of Germany ×2 SV7BAY · Greece YO9HP · Romania CT1BFP · Portugal EA2BHE · Spain EA5DQW · Spain

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 DD5SI

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: JO52 · 140 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 803 km (approx.)
Last such locator decoded: 2026-09-21 16:59 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	DD5SI S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 16:59	40m	-1 / -2	LA2GCA	+2 / -4	3	Partial capture
09-21 16:59	40m	- / -	HA7TM	+23 / -	2	Partial capture
09-21 16:57	40m	-6 / -15	DL9NO	+3 / -3	6	✓ Full exchange observed
09-21 16:56	40m	-9 / -16	UX7QV	-4 / -6	4	✓ Full exchange observed
08-29 21:51	80m	+4 / -9	CT3MD	-8 / -5	7	✓ Full exchange observed
08-29 21:31	20m	- / -4	NU1T	-3 / -	2	✓ Closing fragment
08-29 21:25	20m	- / -13	KS4OT	-10 / -	4	✓ Closing fragment
08-29 21:15	80m	-4 / -	OE2AGZ	- / -11	5	Partial capture
08-29 21:12	80m	-6 / -	DO9FSE	- / -16	5	Partial capture
08-29 21:11	80m	+1 / -	OE2AGZ	- / -	3	Partial capture
08-29 21:07	80m	+2 / -	DO1TEM	- / -7	3	✓ Closing fragment
08-29 21:03	80m	-8 / -3	LZ2VQ	-1 / -8	5	✓ Full exchange observed
08-29 21:02	80m	-1 / -	G8BCG	-11 / -9	4	✓ Closing observed
08-29 10:02	20m	-6 / -	RO6OP	- / -	7	Partial capture
08-29 09:58	20m	-7 / -	SV5BYP	- / -10	3	✓ Closing fragment
08-29 09:57	20m	-7 / -	TF5B	- / -	3	Partial capture
08-29 09:55	20m	-8 / -	F1PSX	- / -8	2	✓ Closing fragment
08-29 09:54	20m	-8 / -	UT7UJ	- / -14	2	✓ Closing fragment
08-29 09:51	20m	- / -	F5RRS	+4 / -	4	Partial capture
08-29 09:50	20m	-10 / -11	UA6YW	-11 / -4	7	✓ Full exchange observed
08-29 09:49	20m	-7 / -	US2YW	- / +7	2	✓ Closing fragment
08-29 09:43	20m	-5 / -	TF5B	- / -	7	Partial capture
08-29 09:38	20m	-10 / -	RI1FJL	- / -	4	Partial capture
08-28 19:35	20m	- / -2	LZ1ZF	0 / -	2	✓ Closing fragment
08-27 21:28	40m	-15 / -	YO4NF	-3 / -2	2	✓ Closing observed
08-27 21:27	40m	-16 / -	EB2EMZ	- / -9	2	✓ Closing fragment
08-27 21:22	20m	- / +2	F5PBG	-10 / -	3	✓ Closing fragment
08-27 21:13	20m	-13 / -	VE3ARF	-5 / -1	4	✓ Closing observed
08-26 21:42	40m	-4 / -7	OE6TNO	-10 / -5	5	✓ Full exchange observed
08-26 21:42	40m	-2 / -9	R2EA/P	0 / +4	5	✓ Full exchange observed
08-26 21:37	40m	- / -7	UW5IM	+17 / -	3	✓ Closing fragment
08-26 21:34	40m	-2 / -17	PA1AA	-7 / +4	5	✓ Full exchange observed
08-26 21:32	40m	-5 / -9	LZ2VQ	+4 / -12	4	✓ Full exchange observed
08-26 21:30	40m	- / -	DJ0MAB	+1 / -	4	Partial capture
08-26 21:29	40m	- / -	PD0IFI	+2 / -	10	Partial capture
08-26 21:27	40m	-7 / +5	PC2J	+2 / -1	5	✓ Full exchange observed
08-26 21:24	40m	- / -	F1IQH	-9 / -	3	Partial capture
08-26 21:24	40m	-7 / +5	OH1LA	-17 / -2	4	✓ Full exchange observed
08-26 21:07	20m	-9 / -	RZ4FWA	- / -12	2	✓ Closing fragment
08-26 21:06	20m	-12 / -7	IQ4JO	+10 / -15	5	✓ Full exchange observed
08-26 20:52	80m	-14 / +7	DL1UDO	-11 / -	4	✓ Full exchange observed
08-26 20:50	80m	-6 / +6	OK1UOZ	-4 / -	5	✓ Full exchange observed
08-26 20:48	80m	-13 / -11	DL6UM	0 / +6	9	✓ Full exchange observed
08-26 20:47	80m	-14 / -	DK8HC	-8 / -	4	✓ Closing observed
08-26 20:45	80m	-15 / -	DL4KER	- / +7	3	✓ Closing fragment
08-26 20:42	80m	-16 / -	DL1AOB	- / -	3	✓ Closing fragment
08-26 20:39	80m	-11 / -	DO5OT	+4 / -	7	✓ Full exchange observed
08-25 16:33	40m	-7 / -	OK1MAT	- / -7	3	✓ Closing fragment
08-22 17:04	80m	-11 / -	DL4HTK	-13 / -	2	✓ Closing observed
08-22 17:00	80m	-8 / -	DO8JB	- / -2	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
165715  +1 2001  DD5SI DL9NO JN59
165745  -4 1438  DD5SI UX7QV 73
165745  +2 2001  DD5SI DL9NO JN59
165800  -7 1438  DL9NO DD5SI -03
165815  +5 2001  DD5SI DL9NO R-15
165830  -6 1438  DL9NO DD5SI RR73
165845  +5 2001  DD5SI DL9NO 73
165900  -6 1438  CQ DD5SI JO52
165915 +24 2954  DD5SI HA7TM JN97
165930  -4 1438  CQ DD5SI JO52
165945  -1 1335  DD5SI PA7ZZ JO22
165945  +4  833  DD5SI LA2GCA JO49
165945 +22 2954  DD5SI HA7TM JN97
170000  -1 1438  LA2GCA DD5SI -04
170015  +1  833  DD5SI LA2GCA R-02

80m

UTC    dB Audio  Message
211330 -10  503  DO9FSE DD5SI R-16 (x3)
211500  -5  503  OE2AGZ DD5SI R-11 (x5)
215130 -10  917  DD5SI CT3MD -09
215145  +4  538  CT3MD DD5SI R-05
215200  -5  917  DD5SI CT3MD RR73
215245  -4  539  CT3MD DD5SI R-05 (x4)

20m

UTC    dB Audio  Message
095900 -11 1126  SV5BYP DD5SI R-10 (x2)
100245  -6 1126  RO6OP DD5SI JO52 (x7)
212515 -11  837  DD5SI KS4OT EM83 (x4)
213145  -4 3032  DD5SI NU1T -04 (x2)

10m

UTC    dB Audio  Message
154230 -16 1016  CQ DD5SI JO52 (x2)
154315  +2 1016  DD5SI DH5BM JO41
154400 -12 1016  YO9HP DD5SI 73
155015 -13 1016  PP5HR DD5SI JO52 (x11)

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.

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