RK9UM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Asiatic Russia Most frequent locator attributed to this token: NO35

Receiver-side FT8 activity involving RK9UM, decoded by SO8OO in southeastern Poland. 892 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 43 UTC dates in the available aggregate history. Observed between 2026-06-06 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 892 FT8 messages attributed to RK9UM as the transmitting token by decoded message structure across 43 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (48%), followed by 80 m (28%) and 20 m (24%). Most decodes (80%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

892
Messages attributed
43
UTC dates decoded
209
Active 15-min windows
-12 dB
Estimated median S/N

Bands

80m · 247 40m · 432 20m · 213
First attributed message: 2026-06-06
Last attributed message: 2026-09-19 15:05 UTC

Observed FT8 message patterns

Attributed sample
892 messages
Active dates
43 UTC dates
Estimated median S/N
-12 dB
Estimated 10th-90th percentile
-21 to -4.3 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 276, moderate (-15 to -9 dB) 378, strong (≥ -8 dB) 238.

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 RK9UM in decoded directed-looking exchanges:

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 RK9UM

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
NO35 · 404 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
4,271 km (approx.)
Last such locator decoded
2026-09-14 23:21 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 UTCBandRK9UM S/NCounterpartCounterpart S/NMsgsCapture
09-19 15:04 40m -15 / -6 RN3TT -9 / -24 3 ✓ Full exchange observed
09-19 15:04 40m - / 0 UA3IDQ -7 / - 3 Partial capture
09-18 19:17 80m - / -16 RA6BL -2 / - 2 ✓ Closing fragment
09-18 19:14 80m - / -6 EU1KY +16 / - 2 ✓ Closing fragment
09-14 23:21 80m -24 / -13 9A3AUH +10 / - 5 Partial capture
09-14 23:18 80m - / -26 DO1IJB -2 / - 7 Partial capture
09-14 23:17 80m - / +10 RL3T -8 / - 2 ✓ Closing fragment
09-14 23:14 80m -9 / -20 RC6OU +12 / -8 4 ✓ Full exchange observed
09-14 22:59 80m -18 / -6 RD0L/3 -10 / - 2 Partial capture
09-14 22:55 80m - / -10 EU7FBB -12 / - 2 ✓ Closing fragment
09-14 22:13 40m -19 / -12 PY5QW -18 / - 2 Partial capture
09-14 22:12 40m -9 / -6 HB9ELE -6 / -18 10 ✓ Full exchange observed
09-14 22:09 40m - / -17 EA7BUU -6 / - 4 ✓ Closing fragment
09-14 22:07 40m -11 / -5 R1QF/P +2 / -11 5 Partial capture
09-14 22:04 40m -24 / -12 EA7BUU -7 / -24 3 Partial capture
09-14 21:55 80m -9 / -14 SP6JIU +32 / -21 4 ✓ Full exchange observed
09-14 21:51 80m - / -18 R7ZY +2 / - 2 ✓ Closing fragment
09-14 21:50 80m -19 / -25 SP9ENV +4 / -12 4 ✓ Full exchange observed
09-09 18:50 80m -22 / -21 SN40KZE +8 / -19 5 Partial capture
09-09 18:39 80m -15 / 0 RK2A +10 / -5 6 ✓ Full exchange observed
09-09 18:33 80m - / -13 RW1AI 0 / - 2 ✓ Closing fragment
09-09 18:26 80m -9 / - DJ7M - / - 3 Partial capture
09-09 18:23 80m -13 / -6 UF3T +8 / -4 4 ✓ Full exchange observed
09-09 18:22 80m -6 / -10 HB9AZZ +20 / -13 5 ✓ Full exchange observed
09-09 14:35 40m - / - R3MDJ -18 / - 2 Partial capture
09-08 18:51 80m -12 / - RT4A/QRP - / -20 3 Partial capture
09-08 18:47 80m - / -7 R3QS +2 / - 2 ✓ Closing fragment
09-08 18:46 80m -7 / -3 R2SN +8 / -16 10 ✓ Full exchange observed
09-08 18:46 80m -12 / - UN8DAW - / -8 3 ✓ Closing fragment
09-08 18:39 80m -6 / -18 R2GFN +2 / -13 5 ✓ Full exchange observed
09-03 17:52 80m -7 / -6 R1NI +1 / -14 6 ✓ Full exchange observed
09-03 17:49 80m - / -18 RA6ATZ +7 / - 2 ✓ Closing fragment
09-03 17:41 80m -24 / -8 EU1DC +11 / - 4 ✓ Closing observed
09-03 17:40 80m -12 / -11 SP9KR +12 / -7 5 ✓ Full exchange observed
08-31 12:18 20m -17 / - JR1NHD - / - 2 Partial capture
08-31 12:16 20m - / -14 PA4AV +8 / - 2 ✓ Closing fragment
08-30 21:19 40m - / -14 YO8CKT -20 / - 2 ✓ Closing fragment
08-30 21:16 40m -4 / -5 EA5S +3 / -15 5 ✓ Full exchange observed
08-30 21:13 40m - / +1 LZ123RF -6 / - 2 Partial capture
08-30 21:08 40m -8 / - R7IQ -12 / -19 3 ✓ Closing observed
08-30 21:07 40m - / 0 LZ123RF -4 / - 4 Partial capture
08-30 21:01 40m -12 / -10 SP5MIG -16 / - 3 ✓ Closing observed
08-30 20:47 80m - / - HB9TIH -7 / - 5 Partial capture
08-30 20:46 80m -8 / -12 DL3TC +1 / -17 7 ✓ Full exchange observed
08-30 20:44 80m -16 / -20 DL1UDO 0 / -23 5 ✓ Full exchange observed
08-30 20:42 80m - / - HB9TIH -4 / - 6 Partial capture
08-30 20:41 80m -13 / -12 5P1KZX +16 / -19 5 ✓ Full exchange observed
08-30 20:40 80m -10 / - IW6NEM - / - 4 Partial capture
08-30 20:40 80m - / - SM5DFM -2 / - 2 Partial capture
08-30 20:38 80m - / -19 IZ3EAX +7 / - 5 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
221515  -6 2218  HB9ELE RK9UM NO35
221530  -9  747  RK9UM HB9ELE -12
221545 -12 2218  HB9ELE RK9UM R-18
221600 -15  747  RK9UM HB9ELE -12 (x4)
190400  -2 1984  RK9UM DL9BDR RR73
150430 -12  767  RK9UM UA3IDQ +00
150445  -9 2146  RK9UM RN3TT -06
150500 -14 2145  RN3TT RK9UM R-24
150530  -5  767  RK9UM UA3IDQ +00
150530 -16 2146  RN3TT RK9UM 73
150600  -5  767  RK9UM UA3IDQ +00
150845 -13  601  RK9UM UA9UT -09
80m 
UTC    dB Audio  Message
231900  -3 1694  RK9UM DO1IJB JN48 (x5)
232100 -24 2275  9A3AUH RK9UM NO35
232115  +8 2275  RK9UM 9A3AUH -13 (x4)
165545  +1  291  RK9UM RA6SA RR73
191400 +21 2806  RK9UM EU1KY -06 (x2)
191730  -1 1032  RK9UM RA6BL -16 (x2)
20m 
UTC    dB Audio  Message
054815 -21 1443  HA5AQ RK9UM R-16
054830 -20 1443  RK9UM HA5AQ RR73
055515 -24 1320  PA3CNI RK9UM NO35
060515  -5 2905  YT7TZ RK9UM NO35
060600 -10 2905  RK9UM YT7TZ -11 (x3)
065800 -14 1418  LZ6C RK9UM NO35
065815 -10 1417  RK9UM LZ6C -21 (x2)
152715 -10 1015  SP3CUG RK9UM NO35
121600  +7 2250  RK9UM PA4AV -14 (x2)
121815 -18 2505  JR1NHD RK9UM NO35 (x2)
10m 
UTC    dB Audio  Message
080700 -24 1948  RK9UM UA6AHR -16
081145 -12  926  RK9UM A41ZZ -19
075345  -3  985  RK9UM PI4DX -03 (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.

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