R4SF — 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: European Russia Most frequent locator attributed to this token: LO36

Receiver-side FT8 activity involving R4SF, decoded by SO8OO in southeastern Poland. 156 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-10-21.

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 156 FT8 messages attributed to R4SF as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (96%), followed by 40 m (4%). Most decodes (74%) fell within the six-hour window 06:00-12:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (71%); the estimated median was -4 dB.

Overview

156
Messages attributed
7
UTC dates decoded
23
Active 15-min windows
-4 dB
Estimated median S/N

Bands

40m · 6 20m · 150
First attributed message: 2026-06-10
Last attributed message: 2026-10-21 04:51 UTC

Observed FT8 message patterns

Attributed sample
156 messages
Active dates
7 UTC dates
Estimated median S/N
-4 dB
Estimated 10th-90th percentile
-14 to +2 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, moderate (-15 to -9 dB) 39, strong (≥ -8 dB) 110.

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 R4SF 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 R4SF

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
LO36 · 35 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,817 km (approx.)
Last such locator decoded
2026-09-20 19:26 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 UTCBandR4SF S/NCounterpartCounterpart S/NMsgsCapture
10-23 05:36 40m - / -3 R1QAV -14 / - 2 Partial capture
10-23 05:35 40m - / - ON8WR -3 / - 3 Partial capture
10-23 05:31 40m - / +7 UA3DPM +4 / - 2 ✓ Closing fragment
10-23 05:29 40m - / - RV3F -14 / - 3 ✓ Closing fragment
10-23 05:25 40m - / -12 SV1DKR -16 / - 4 ✓ Closing fragment
10-23 05:15 40m - / -6 R7OF 0 / - 2 ✓ Closing fragment
10-23 05:11 40m - / -12 R3QX -6 / - 2 Partial capture
10-23 05:09 40m - / -7 R2SDZ -1 / - 2 ✓ Closing fragment
10-23 05:04 40m - / -1 R6ZS -9 / - 2 ✓ Closing fragment
10-23 05:01 40m - / -14 RK6OV -16 / - 4 ✓ Closing fragment
10-23 04:55 40m - / +4 RO6K -18 / - 2 ✓ Closing fragment
10-23 04:53 40m - / -9 R4ADJ -8 / - 3 ✓ Closing fragment
10-23 04:51 40m - / -3 RA3DAD -6 / - 2 ✓ Closing fragment
10-23 04:45 40m - / -12 R3GO -8 / - 2 ✓ Closing fragment
10-23 04:44 40m - / -15 SV8DCY +9 / - 2 ✓ Closing fragment
10-22 05:57 40m - / -15 ON3MOH -6 / - 2 ✓ Closing fragment
10-22 04:52 40m - / -11 RL3ZA -8 / - 2 ✓ Closing fragment
10-21 05:01 40m - / +10 R1TET -18 / - 2 Partial capture
10-21 05:01 40m - / -10 R6ML -14 / - 4 Partial capture
10-21 05:00 40m - / +3 UA1ACO -12 / - 2 ✓ Closing fragment
10-21 04:54 40m - / -6 UA3WDO 0 / - 2 ✓ Closing fragment
10-21 04:51 40m -16 / - P4/WE9V - / -12 2 Partial capture
10-19 07:13 40m - / -18 RW1AI -13 / - 2 ✓ Closing fragment
10-19 07:07 40m - / -17 SP5MXZ +6 / - 4 ✓ Closing fragment
10-19 06:46 40m - / -16 EU1EU -9 / - 3 Partial capture
10-19 06:37 40m - / -14 YO4NT +1 / - 2 ✓ Closing fragment
10-19 05:47 40m - / -13 R2OM -14 / - 2 ✓ Closing fragment
10-19 05:46 40m - / -12 EU4U +6 / - 3 ✓ Closing fragment
10-19 05:40 40m - / -4 UA4FKT -9 / - 5 ✓ Closing fragment
10-16 05:33 40m - / -10 RU3GC +4 / - 2 ✓ Closing fragment
10-16 05:29 40m - / +2 R2SL -2 / - 2 ✓ Closing fragment
10-16 05:11 40m - / -19 PI4DX +6 / - 4 ✓ Closing fragment
10-16 04:59 40m - / -9 R4LBP -7 / - 2 ✓ Closing fragment
10-16 04:56 40m - / -10 RK6MC -8 / - 3 ✓ Closing fragment
10-16 04:53 40m - / -6 R3PE -14 / - 3 ✓ Closing fragment
10-16 04:43 40m - / -13 R1BDX -3 / - 2 Partial capture
10-06 05:03 40m - / -19 RA6ATZ -10 / - 3 ✓ Closing fragment
10-05 05:52 40m - / -4 EU6KA -4 / - 3 ✓ Closing fragment
10-05 05:41 40m - / -8 RU3X -10 / - 2 ✓ Closing fragment
10-05 05:20 40m - / -13 3Z4DX -6 / - 2 ✓ Closing fragment
10-05 05:09 40m - / -9 R80SAA -2 / - 2 ✓ Closing fragment
10-05 05:07 40m - / -7 RA6BL -15 / - 2 ✓ Closing fragment
10-05 05:06 40m - / -10 R3LCG -10 / - 2 ✓ Closing fragment
09-30 05:39 40m - / - F4BYA +5 / - 3 Partial capture
09-30 05:36 40m - / - F4BYA +2 / - 2 Partial capture
09-30 05:36 40m - / - PE1NPS -15 / - 2 Partial capture
09-30 05:34 40m - / -8 EW4DX +2 / - 3 ✓ Closing fragment
09-30 05:20 40m - / -16 ES2AJ +6 / - 2 ✓ Closing fragment
09-30 05:16 40m - / - F4BYA +5 / - 3 Partial capture
09-30 05:16 40m - / -5 RA3QBT -16 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
052500 -15 1863  R4SF SV1DKR KM18 (x4)
052930 -13 2203  R4SF RV3F KO86 (x3)
053100  +2 2831  R4SF UA3DPM R+07 (x2)
053500  -2 2203  R4SF ON8WR JO11 (x3)
053630  -9 2244  R4SF R1QAV KO79 (x2)
054330 -22 1282  R4SF RC9WC +03
20m 
UTC    dB Audio  Message
104545 -19 1967  R4SF MM0JTV R-01 (x9)
114400 -12 2395  R4SF R9AL RR73
120900  +6  552  R4SF RG5A R+01 (x2)
121200  -6 1757  RW6A/P R4SF -07
121215  -6 1160  R4SF RW6A/P R-07 (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

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