R0SDM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Asiatic Russia Most frequent locator attributed to this token: NO43

Receiver-side FT8 activity involving R0SDM, decoded by SO8OO in southeastern Poland. 121 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-06-19.

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 121 FT8 messages attributed to R0SDM as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (89%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.

Overview

121

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

20m · 121

First attributed message: 2026-06-17
Last attributed message: 2026-06-19 04:54 UTC

Observed FT8 message patterns

Attributed sample: 121 messages
Active dates: 3 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -20 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 36, moderate (-15 to -9 dB) 72, strong (≥ -8 dB) 13.

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 R0SDM in decoded directed-looking exchanges:

EA1N · Spain ×3 F6FLU · France ×3 R4RN · European Russia ×2 RV9FF · European Russia ×2 RG5A · European Russia ×2 RO5K · European Russia ×2 RA3RPW · European Russia ×2 HL2ZN · Republic of Korea ×2 R5AV · European Russia ×2 RV6HE · European Russia ×2 R5BM · European Russia ×2 R3XG · European Russia ×2

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 R0SDM

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: NO43 · 79 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 4,473 km (approx.)
Last such locator decoded: 2026-06-19 04:49 UTC

Other locator fields attributed to this token: NO63 (6).

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	R0SDM S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-27 05:03	20m	- / -8	UA9QFF	-20 / -	2	✓ Closing fragment
08-27 04:59	20m	- / -15	UA3GIE	+19 / -	3	Partial capture
08-21 05:59	20m	- / -14	RA9XSL	-10 / -	2	✓ Closing fragment
08-21 05:46	20m	- / -16	R2UZ	-17 / -	3	Partial capture
08-21 05:27	20m	- / -4	R0AL	-12 / -	2	✓ Closing fragment
07-29 17:09	20m	- / -	F6FLU	+6 / -	3	✓ Closing fragment
07-29 17:01	20m	- / -15	LX1NO	+9 / -	3	✓ Closing fragment
07-29 16:55	20m	- / -	R6DVG	-4 / -	3	Partial capture
07-29 16:54	20m	- / -	RG5A	-12 / -	2	✓ Closing fragment
07-29 16:52	20m	- / -17	EA3FH	+6 / -	4	✓ Closing fragment
07-29 16:48	20m	- / -17	UA3NFG	-6 / -	2	✓ Closing fragment
07-29 16:41	20m	- / -15	S59A	-1 / -	3	✓ Closing fragment
07-29 16:40	20m	- / -17	EA3NT	-3 / -	4	✓ Closing fragment
07-29 16:11	40m	- / -16	RA6YDX	-20 / -	3	✓ Closing fragment
07-29 15:43	40m	- / -19	RA3ZGT	-13 / -	4	✓ Closing fragment
07-29 13:08	20m	- / -15	RV3F	-4 / -	2	✓ Closing fragment
07-29 12:48	20m	- / -17	F5HNQ	-3 / -	2	✓ Closing fragment
07-29 12:42	20m	- / -	F5HNQ	+3 / -	4	Partial capture
07-29 11:23	20m	- / -11	DH1PS	-10 / -	3	Partial capture
07-29 10:13	20m	- / -19	R2GFD	-8 / -	3	✓ Closing fragment
07-29 10:04	20m	- / -17	DH9DR	+1 / -	3	✓ Closing fragment
07-29 10:03	20m	- / -	DL3MSB	-5 / -	2	Partial capture
07-29 09:36	20m	- / -19	DL6KA	+7 / -	11	✓ Closing fragment
07-28 09:25	20m	- / -21	EA1N	-1 / -	4	✓ Closing fragment
07-28 08:00	20m	- / -	RG5A	-8 / -	2	Partial capture
07-28 07:56	20m	- / -15	F6FLU	-2 / -	6	✓ Closing fragment
07-28 07:52	20m	- / -	F8NHF	-21 / -	3	Partial capture
07-28 07:48	20m	- / -14	R3XG	-8 / -	3	✓ Closing fragment
07-28 07:46	20m	- / -	UA6HGM	+2 / -	3	Partial capture
07-28 06:44	20m	- / -23	RM8W	-8 / -	2	Partial capture
07-28 06:29	20m	- / -16	R6LFO	-15 / -	4	Partial capture
07-28 04:56	20m	- / -4	RT7N	-16 / -	2	✓ Closing fragment
07-28 04:56	20m	- / -	RX7O	-14 / -	2	✓ Closing fragment
07-28 04:51	20m	- / -21	UA3GT	-11 / -	2	✓ Closing fragment
07-28 04:41	20m	- / -14	RC6OU	+9 / -	3	✓ Closing fragment
07-27 10:05	20m	- / -6	RA3RPW	-4 / -	2	✓ Closing fragment
07-27 09:47	20m	- / -24	RA3Y	-4 / -	3	✓ Closing fragment
07-27 09:36	20m	- / -13	UI6L	-15 / -	4	Partial capture
07-27 09:30	20m	- / -18	F6FLU	+5 / -	9	Partial capture
07-27 09:13	20m	- / -21	IK1WGX	-2 / -	6	✓ Closing fragment
07-27 08:53	20m	- / +6	RU3UR	-2 / -	2	✓ Closing fragment
07-27 08:47	20m	- / -7	RA4FOC	-5 / -	2	Partial capture
07-27 08:43	20m	- / -	F6FLU	+2 / -	6	Partial capture
07-27 08:43	20m	- / -19	RK6AUV	-11 / -	3	✓ Closing fragment
07-27 08:41	20m	- / -	RA4FOC	-8 / -	3	Partial capture
07-27 08:33	20m	- / -	F6FLU	0 / -	4	Partial capture
07-27 08:09	20m	- / -14	RA3Y	-3 / -	3	Partial capture
07-27 07:12	20m	- / -25	RX3DQX	-7 / -	5	✓ Closing fragment
07-27 07:08	20m	- / -9	RU6K	-11 / -	3	✓ Closing fragment
07-27 07:04	20m	- / -	IK1WGX	-16 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
054715 -19 1967  R0SDM R2UZ -15 (x2)
055315  -9 2737  R0SDM R9FBL -14
055945 -12  968  R0SDM RA9XSL -14 (x2)
060815 -17  969  R0SDM RD4HX LO53
041245 -16 1662  R0SDM UA9CK -18
041645 +14  551  R0SDM RN6HGI LN14
043215 -12  762  R0SDM RD4WM -20
043445  -9  370  R0SDM R8CKD R-14
045900 +19 2571  R0SDM UA3GIE -15 (x3)
050300 -22 1428  R0SDM UA9QFF -08 (x2)

40m

UTC    dB Audio  Message
231245  -2 2721  R0SDM I1RJP JN45
231315  -2 2721  R0SDM IK2ZJR JN45 (x5)
154300 -15 2054  R0SDM RA3ZGT KO81 (x4)
155630 -11 2645  R0SDM R6ML -15
160545 -22 2180  R0SDM RU4HU LO43
161100 -22 1738  R0SDM RA6YDX LN04 (x3)

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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