RU4B — FT8 activity observed at SO8OO

Observed FT8 message patterns

Attributed sample

1,152 messages

Active dates

48 UTC dates

Estimated median S/N

-7 dB

Estimated 10th-90th percentile

-15 to +6 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 93, moderate (-15 to -9 dB) 387, strong (≥ -8 dB) 672.

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 RU4B 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 RU4B

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

LN28 · 642 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

1,686 km (approx.)

Last such locator decoded

2026-09-10 04:42 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.

Recent FT8 messages decoded at SO8OO

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

UTC    dB Audio  Message
042345  +9 2784  RU4B YO9IAB RR73
042530 -19 2090  HA1SU RU4B 73
042730 -15 2102  CQ RU4B LN28 (x2)
042930 -19 2090  UN9LBC RU4B -16
043615 -11 2624  CQ RU4B LN28
043645 -10 2624  R3BGU RU4B LN28 (x2)
044000  -7 1832  RU4B R3WF KO72 (x3)
044130  +7 2624  RU4B UA3WG KO71 (x3)
044245 -10 2624  CQ RU4B LN28                          a1

UTC    dB Audio  Message
174130  +1 2347  RK3YWA RU4B LN28 (x3)
174415  -7 2075  RU4B RK3YWA -06
192730 -13 2347  R2GFN RU4B LN28 (x2)
192830  -9 2347  R3PJV RU4B LN28 (x2)
193030  +0  975  RU4B R2GFN RRR
174500 +11 2704  RU4B R3AP +00 (x2)
193100 +21 2219  RU4B R2FEA -20 (x2)
193630 -12 1574  RU4B RA3TVW +00 (x2)

UTC    dB Audio  Message
171600  +0 2184  EA6NB RU4B LN28
171630  +0 2184  CQ RU4B LN28                          a1
171700  +4 2184  SP8XGG RU4B LN28 (x3)
171900 +10 2184  IK6DLK RU4B -09
172100  +8 2184  Z31PM RU4B LN28
172130  +7 2184  CQ RU4B LN28
172200  +8 2184  UB3BDB RU4B -18 (x2)
172300  +6 2184  CQ RU4B LN28 (x3)
172430  +8 2183  IU1DXU RU4B LN28
172545 -12 1472  RU4B IU1DXU -01

UTC    dB Audio  Message
085645 +11 2496  RU4B DG0BS -20 (x2)
120230 -14 2403  RU4B RV3YR -02 (x5)
120930 -18 2401  RV9CW RU4B LN28
064545 -21 1810  RU4B RN3H KO84 (x2)
074830 -20 1481  RU4B RG7A KN93 (x2)
075330  +7  658  RU4B SX0W KN10 (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.