SM4DDS — 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: Sweden Most frequent locator attributed to this token: JO79

Receiver-side FT8 activity involving SM4DDS, decoded by SO8OO in southeastern Poland. 49 FT8 messages attributed to this token as transmitter, on 80m, across 11 UTC dates in the available aggregate history. Observed between 2026-09-03 and 2026-11-04.

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 49 FT8 messages attributed to SM4DDS as the transmitting token by decoded message structure across 11 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (100%). Several six-hour UTC windows tied for the largest share (82%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

80m · 49

First attributed message: 2026-09-03
Last attributed message: 2026-11-04 21:24 UTC

Observed FT8 message patterns

Attributed sample: 49 messages
Active dates: 11 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -19 to -3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 11, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 19.

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 SM4DDS in decoded directed-looking exchanges:

EA7Y · Spain R9FDE/P · European Russia DJ0MAB · Fed. Rep. of Germany PA0EBG · Netherlands DA6YY · Fed. Rep. of Germany DK0PRL · Fed. Rep. of Germany DL1YBB · Fed. Rep. of Germany DO1ID · Fed. Rep. of Germany DO1SWC · Fed. Rep. of Germany DO5HCS · Fed. Rep. of Germany IQ4JO · Italy LA2GCA · Norway

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 SM4DDS

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: JO79 · 19 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,148 km (approx.)
Last such locator decoded: 2026-11-04 21:23 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	SM4DDS S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-04 21:13	80m	- / -15	SP8HDC	-18 / -	2	Partial capture
11-04 21:09	80m	- / -	DO3BOX	-18 / -	2	Partial capture
11-01 20:31	80m	-14 / -	SP0LPR	-10 / -15	2	Partial capture
11-01 20:13	80m	-12 / -	R4FDK	- / -8	2	Partial capture
11-01 20:11	80m	-10 / -7	DK0PRL	+1 / -11	5	✓ Full exchange observed
10-29 21:09	80m	- / -	DO2FRE	-14 / -	2	Partial capture
10-29 21:09	80m	- / -9	SQ4INW	+9 / -	3	✓ Closing fragment
10-26 20:31	80m	+2 / -6	DA6YY	-8 / -14	5	✓ Full exchange observed
10-26 20:29	80m	-4 / -14	PE1PIX	-10 / -14	6	✓ Full exchange observed
10-17 20:11	80m	-6 / -12	R2EN	-12 / -3	4	✓ Full exchange observed
10-17 20:06	80m	-12 / -15	DO1SWC	-16 / -15	9	✓ Full exchange observed
10-17 20:04	80m	-4 / -5	DL1YBB	-15 / -5	5	✓ Full exchange observed
10-17 20:03	80m	-6 / -	DO5HCS	- / -7	3	✓ Closing fragment
10-15 20:05	80m	- / -	F1JIO	-2 / -	3	Partial capture
10-11 20:19	80m	- / +8	DO1ID	+15 / -	3	✓ Closing fragment
10-11 20:19	80m	- / -	IU2THY	-5 / -	2	Partial capture
10-11 20:19	80m	-14 / -7	OZ1TDK	-8 / -	2	✓ Closing observed
10-11 20:16	80m	-19 / -7	R5AV	-4 / +3	4	✓ Full exchange observed
10-11 04:42	80m	-8 / -	9H6C	- / -	3	Partial capture
10-07 04:14	80m	-16 / -	TK1CX	- / -4	2	Partial capture
10-04 19:51	80m	-16 / -	V51WH	- / -15	3	✓ Closing fragment
09-19 20:06	80m	-11 / -	RI1FJZ	- / -	2	Partial capture
09-15 19:35	80m	-16 / -	OH6NIO	-6 / +5	4	✓ Closing observed
09-03 01:56	80m	-6 / -5	IQ4JO	-9 / +2	5	✓ Full exchange observed
08-27 07:29	40m	- / -8	DJ0MAB	-13 / -	3	✓ Closing fragment
08-20 15:03	20m	- / -	F4LHZ	-8 / -	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
201200 -10 1119  DK0PRL SM4DDS RR73
201215  +0 1060  SM4DDS DK0PRL 73
201300 -11 1119  CQ SM4DDS JO79
201330  -8 1119  R4FDK SM4DDS -08 (x2)
203145 -10 1315  SM4DDS SP0LPR KO02
203330 -14 1924  SP0LPR SM4DDS -15
210830 -13 1919  SM4DDS DL1HTY JO61
210930 -16 1920  SM4DDS DO3BOX JO30 (x2)
211300 -19 1919  SM4DDS SP8HDC KO00 (x2)
211745 -13 1917  HS0ZOY SM4DDS JO79
212330  -7 1834  CQ SM4DDS JO79
212400  -4 1833  PA3BLY SM4DDS -16

10m

UTC    dB Audio  Message
144415 -22 1367  SM4DDS EA7Y 73

40m

UTC    dB Audio  Message
072915 -10 1500  SM4DDS DJ0MAB JN49 (x3)
144615 -22 2018  SM4DDS PA0EBG 73

20m

UTC    dB Audio  Message
150045 -11 2051  SM4DDS M7TUP IO90
150300  -9 1309  SM4DDS PD3LKN JO22
150330 -15 2051  SM4DDS M7TUP IO90
150330  -9 2426  SM4DDS F4LHZ JN18
150400 -10 1309  SM4DDS R9FDE/P 73
150400 -10 2426  SM4DDS F4LHZ JN18 (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