DF1SD — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JN48

Receiver-side FT8 activity involving DF1SD, decoded by SO8OO in southeastern Poland. 670 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 40 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-19.

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 670 FT8 messages attributed to DF1SD as the transmitting token by decoded message structure across 40 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (44%), followed by 10 m (36%) and 20 m (18%). Most decodes (55%) fell within the six-hour window 05:00-11:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (77%); the estimated median was -2 dB.

Overview

670

Messages attributed

UTC dates decoded

106

Active 15-min windows

-2 dB

Estimated median S/N

Bands

80m · 10 40m · 295 20m · 122 10m · 243

First attributed message: 2026-06-08
Last attributed message: 2026-09-19 18:06 UTC

Observed FT8 message patterns

Attributed sample: 670 messages
Active dates: 40 UTC dates
Estimated median S/N: -2 dB
Estimated 10th-90th percentile: -14 to +10 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 54, moderate (-15 to -9 dB) 103, strong (≥ -8 dB) 513.

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 DF1SD in decoded directed-looking exchanges:

R2EA/P · European Russia ×3 R7OQ · European Russia ×2 DL1BBO · Fed. Rep. of Germany EA1KCN · Spain JJ1RDX · Japan LZ4VR · Bulgaria OH0ERF · Aland Islands OM8LM · Slovak Republic R1CCX · European Russia R1NIM · European Russia R1ZH · European Russia R3GO · European Russia

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 DF1SD

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: JN48 · 415 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 941 km (approx.)
Last such locator decoded: 2026-09-19 18:06 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	DF1SD S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 17:58	80m	+1 / -	R2EA/P	- / -	10	Partial capture
09-14 06:05	40m	-1 / -	R3DIK/M	- / -	13	Partial capture
09-14 05:56	40m	-4 / -	VP5/K5UR	- / -	15	Partial capture
09-11 06:24	40m	-6 / -	OO0O	- / -	2	Partial capture
09-11 06:22	40m	-2 / -	KC9USW	- / -	3	Partial capture
09-11 06:21	40m	-6 / -	GJ0KYZ	- / +3	2	✓ Closing fragment
09-11 06:18	40m	+1 / -	J38DX	- / -16	5	✓ Closing fragment
09-10 17:24	40m	-3 / -	UB3ZKO	- / -	2	Partial capture
09-10 17:23	40m	-6 / -	UB8QBL	- / -	2	Partial capture
09-10 17:21	40m	-4 / -6	RX9ABI	-10 / -8	4	✓ Full exchange observed
09-10 17:20	40m	-13 / -13	R9YAW	-16 / -	2	Partial capture
09-10 17:17	40m	-4 / -10	UA6LCF	-8 / -20	5	✓ Full exchange observed
09-09 06:06	40m	-3 / -	IU8RFW	- / -8	2	✓ Closing fragment
09-09 06:05	40m	-2 / -	G5STU	- / -10	2	✓ Closing fragment
09-09 06:01	40m	-1 / -	Z68PX	- / -	5	Partial capture
09-09 05:58	40m	-4 / -	PV8AJ	- / -	5	✓ Closing fragment
09-05 17:34	40m	+10 / -	DS2CYI	- / -	2	Partial capture
09-05 17:32	40m	+9 / -	R1943OD	- / 0	2	Partial capture
09-05 17:31	40m	+11 / -16	RC6OX	-2 / -	4	Partial capture
09-05 16:20	40m	+9 / -15	R9SAP	-6 / -19	4	✓ Full exchange observed
09-05 16:16	40m	+11 / -14	RJ6ON	+4 / -8	9	✓ Full exchange observed
09-05 16:13	40m	+12 / -	RA3PGR	- / -19	3	✓ Closing fragment
09-05 16:12	40m	+8 / -6	RA1N	-3 / -	3	Partial capture
09-05 16:08	40m	+4 / -	R1943OD	- / -	6	Partial capture
08-31 20:32	40m	+9 / -	RI1FJL	- / -18	7	Partial capture
08-31 20:26	20m	- / +3	MI7RDK	-3 / -	4	✓ Closing fragment
08-29 20:12	40m	+4 / -	<...>	- / -	2	Partial capture
08-29 16:40	40m	+7 / -7	DL5EBS	+10 / -15	4	✓ Full exchange observed
08-29 16:39	40m	+7 / -11	RM6OS	-9 / -	6	✓ Closing observed
08-29 16:38	40m	- / -7	DK1HZ	+13 / -	3	✓ Closing fragment
08-29 16:36	40m	-1 / -	GB0SL	- / +1	5	✓ Closing fragment
08-29 16:34	40m	+3 / -	RO6OP	- / -	3	Partial capture
08-29 16:33	40m	+3 / -	R6OF	- / -	2	Partial capture
08-29 16:32	40m	+1 / -	RM6OS	- / -	2	Partial capture
08-29 16:29	40m	-2 / -	R2EA/P	-1 / -4	6	✓ Closing observed
08-28 10:03	10m	-10 / -	YD6APA	- / -24	2	✓ Closing fragment
08-16 10:03	10m	+3 / -	SV4AQJ	-21 / -20	4	✓ Closing observed
08-13 20:43	40m	+1 / -	JH2FXK	- / -21	4	✓ Closing fragment
08-13 20:39	40m	-1 / -	JF6XQJ	- / -17	4	✓ Closing fragment
08-13 20:37	40m	+1 / -	OL900CO	- / -25	3	Partial capture
08-13 20:36	40m	0 / +5	DL5ZB	+9 / +9	5	✓ Full exchange observed
08-13 20:35	40m	+1 / -	JH2VVH	- / -18	2	Partial capture
08-13 20:33	40m	-1 / -	DL1CC	-13 / +4	5	✓ Closing observed
08-13 20:32	40m	+4 / +5	OL900CO	-12 / -	2	Partial capture
08-11 08:31	10m	-6 / -	OD5JL	- / -	3	Partial capture
08-11 07:57	10m	+2 / -	DU1RAA	- / -14	6	Partial capture
08-10 07:52	10m	- / -	DL6FBR	-6 / -	2	Partial capture
08-10 07:51	10m	+5 / -	EA3IE	- / -5	2	Partial capture
08-10 07:49	10m	+8 / -	RA4CIY	- / -9	2	Partial capture
08-10 07:44	10m	+4 / -	OH0ERF	- / -	7	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
175815  -8 2196  R2EA/P DF1SD JN48 (x10)

40m

UTC    dB Audio  Message
060515  -1 2470  R3DIK/M DF1SD JN48 (x13)
054515  -6 2599  II7IABB DF1SD JN48
054545  -6 1012  II6IALU DF1SD JN48

20m

UTC    dB Audio  Message
154315 -16 2165  BH5HIE DF1SD RR73
154345 -14 2165  BG8SVE DF1SD -18 (x3)
154545 -13 2166  6K2MAS DF1SD RR73
154645  -7 2165  BA8BLK DF1SD R-11 (x2)
064045 -11  364  DF1SD R6ZB RR73
070330 -22 2128  DF1SD R6ZDJ -01
202215 -13 2666  RV9CX/0 DF1SD JN48
202230 -17 2510  DF1SD BA3QIQ OM99
202600 -11 1437  DF1SD MI7RDK IO74 (x4)

10m

UTC    dB Audio  Message
075830  +4 1553  DU1RAA DF1SD JN48 (x3)
080100  +1 1553  DL1BBO DF1SD RR73
080600 -20 1553  RM3TO DF1SD JN48
083100  -7 1553  OD5JL DF1SD JN48 (x3)
100315  +6 2175  SV4AQJ DF1SD JN48 (x2)
100400 -21 2179  DF1SD SV4AQJ RR73
100415  -2 2174  SV4AQJ DF1SD 73
093630 -13 1621  VK8MA DF1SD JN48
100300  -8 1622  YD6APA DF1SD R-24 (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.

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