RC9UDM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Asiatic Russia

Receiver-side FT8 activity involving RC9UDM, decoded by SO8OO in southeastern Poland. 8 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-08-30.

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 8 FT8 messages attributed to RC9UDM as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -9 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-9 dB

Estimated median S/N

Bands

20m · 8

First attributed message: 2026-06-10
Last attributed message: 2026-08-30 13:14 UTC

Observed FT8 message patterns

Attributed sample: 8 messages
Active dates: 2 UTC dates
Estimated median S/N: -9 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 5, strong (≥ -8 dB) 3.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with RC9UDM in decoded directed-looking exchanges:

EA5JK · Spain R1QF/P · European Russia R2GBR · European Russia RW9WJ · Asiatic Russia RZ9A · Asiatic Russia

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	RC9UDM S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 03:09	40m	- / -11	RW9WJ	-12 / -	2	✓ Closing fragment
09-14 15:23	40m	- / -12	R1QF/P	-17 / -	2	✓ Closing fragment
09-14 15:18	40m	- / -17	R2GBR	-17 / -	2	✓ Closing fragment
08-30 13:24	20m	- / -12	UA4SGZ/6	-4 / -	15	Partial capture
08-30 13:10	20m	-8 / -	R5BM/M	- / -6	3	Partial capture
08-30 13:07	20m	-11 / -	R3WDW/P	- / -6	2	Partial capture
07-07 04:26	20m	- / -16	EA5JK	-6 / -	4	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
151845 -22 1275  RC9UDM R2GBR -17 (x2)
152345 -16 2231  RC9UDM R1QF/P R-12 (x2)
030945 -14 1866  RC9UDM RW9WJ R-11 (x2)
032130 -23 1760  RC9UDM RZ9A 73

20m

UTC    dB Audio  Message
132415  -6 2080  RC9UDM UA4SGZ/6 R-12 (x15)

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