RC4AF — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LN28

Receiver-side FT8 activity involving RC4AF, decoded by SO8OO in southeastern Poland. 117 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 18 UTC dates in the available aggregate history. Observed between 2026-07-19 and 2026-08-24.

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 117 FT8 messages attributed to RC4AF as the transmitting token by decoded message structure across 18 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (84%), followed by 10 m (16%). Most decodes (77%) 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 (79%); the estimated median was -4 dB.

Overview

117
Messages attributed
18
UTC dates decoded
26
Active 15-min windows
-4 dB
Estimated median S/N

Bands

20m · 98 10m · 19
First attributed message: 2026-07-19
Last attributed message: 2026-08-24 05:34 UTC

Observed FT8 message patterns

Attributed sample
117 messages
Active dates
18 UTC dates
Estimated median S/N
-4 dB
Estimated 10th-90th percentile
-10 to +6 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 22, strong (≥ -8 dB) 93.

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 RC4AF 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 RC4AF

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 · 47 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,686 km (approx.)
Last such locator decoded
2026-08-24 05:34 UTC

Other locator fields attributed to this token: LO31 (2).

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 UTCBandRC4AF S/NCounterpartCounterpart S/NMsgsCapture
08-24 05:34 20m +13 / -16 G8KHF -4 / - 5 Partial capture
08-23 02:45 20m -6 / - RD1A - / -12 2 ✓ Closing fragment
08-23 02:44 20m - / -8 UN0GY -5 / - 4 Partial capture
08-22 11:10 20m -17 / - M7JVT - / - 3 Partial capture
08-22 07:13 20m - / -12 IK4LZH -1 / - 2 ✓ Closing fragment
08-21 08:59 20m -2 / -11 DL3MIB -7 / -13 11 ✓ Full exchange observed
08-21 08:50 20m -5 / +4 F6ARS -5 / - 3 ✓ Closing observed
08-20 11:18 20m - / - RA5AK +10 / - 2 Partial capture
08-20 11:17 20m - / - EW8CW -5 / - 5 Partial capture
08-20 11:16 20m +13 / - EA1IOK -18 / -11 4 Partial capture
08-20 11:14 20m +12 / - UA3LRN - / -9 3 ✓ Closing fragment
08-18 09:54 10m -8 / - LY1MG - / -4 2 Partial capture
08-18 09:51 10m -5 / - SP7ROM - / -18 3 ✓ Closing fragment
08-18 09:17 10m - / - F4JOO -17 / - 3 Partial capture
08-18 09:16 10m -1 / -22 R3KJF -11 / -5 7 ✓ Full exchange observed
08-18 09:15 10m -2 / +6 DL7CK 0 / - 4 ✓ Closing observed
08-15 09:03 20m - / - EA5AR -12 / - 5 Partial capture
08-15 09:02 20m 0 / - SP1ZMO - / -1 4 ✓ Closing fragment
08-15 09:00 20m +2 / - EW8DG - / -7 2 ✓ Closing fragment
08-15 08:59 20m +6 / - YO5PHL - / - 2 ✓ Closing fragment
08-15 08:56 20m +5 / -14 F1PBZ +7 / -6 7 Partial capture
08-15 08:55 20m - / -8 F4FSY -9 / - 2 Partial capture
08-07 08:26 20m - / -3 R2EA -10 / - 2 Partial capture
08-07 08:24 20m - / -8 9A4ZM 0 / - 2 Partial capture
08-06 06:57 20m - / - EB3JT +2 / - 7 Partial capture
08-06 06:53 20m -9 / - RG1L - / -8 3 Partial capture
08-06 06:52 20m - / - EB3JT 0 / - 2 Partial capture
08-05 06:18 20m - / - IK4LZH -3 / - 3 Partial capture
08-01 07:16 20m - / - LZ2SPD -12 / - 2 Partial capture
08-01 07:13 20m - / -9 RZ7KR -8 / - 2 Partial capture
07-31 11:35 20m +1 / - G8IXM - / -20 3 ✓ Closing fragment
07-31 11:35 20m -1 / -13 DL1R -4 / -10 12 ✓ Full exchange observed
07-31 11:34 20m - / -16 R1QBE -14 / - 2 Partial capture
07-31 06:40 20m -2 / -1 R5AV +12 / -1 3 ✓ Full exchange observed
07-31 04:36 20m -5 / - PD3LKN - / -9 3 ✓ Closing fragment
07-31 04:32 20m - / - EA5HEU -4 / - 10 Partial capture
07-30 13:32 20m - / - PD1B -21 / - 3 Partial capture
07-30 13:32 20m -2 / - UA1AEL - / -8 3 ✓ Closing fragment
07-30 13:31 20m - / - PE9JAN -10 / - 2 Partial capture
07-30 13:31 20m -2 / - F1JBT - / - 2 ✓ Closing fragment
07-30 13:27 20m -1 / -14 G4YLJ -18 / -10 6 Partial capture
07-30 13:25 20m - / - 9A4ZM +1 / - 3 Partial capture
07-30 13:25 20m -3 / - IQ4JO 0 / -10 4 ✓ Closing observed
07-30 13:23 20m 0 / - OZ5AGJ - / -2 2 ✓ Closing fragment
07-30 07:58 20m - / - OE3EHS +15 / - 3 Partial capture
07-30 07:51 20m -9 / -12 GJ0KYZ -14 / -7 3 ✓ Closing observed
07-30 07:51 20m - / - RX3ASQ -22 / - 2 Partial capture
07-30 02:07 40m - / -12 F1PBZ -8 / - 2 Partial capture
07-30 02:06 40m - / +5 RG5A -2 / - 2 ✓ Closing fragment
07-29 14:32 20m - / - SV1EKI -17 / - 5 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
111045 -20 2178  M7JVT RC4AF LN28 (x2)
024430  -6 2662  RC4AF UN0GY -08 (x2)
024500  -4  573  CQ RC4AF LN28
024515 -12 2072  RC4AF UA3PAB KO84
024530  -8  573  RD1A RC4AF -12
024600  -3 2662  RC4AF UN0GY -08
024600  -5  573  RD1A RC4AF 73
024630  -5 2662  RC4AF UN0GY -08
053445 +13  575  G8KHF RC4AF LN28
053500  -3 2166  RC4AF G8KHF -16 (x4)
10m 
UTC    dB Audio  Message
091715  -6  583  R3KJF RC4AF RR73
091730  -8 1403  RC4AF R3KJF R-22
091730 -15 1568  RC4AF F4JOO JN23
091745  +0  583  R3KJF RC4AF RR73
091800 -23 1568  RC4AF F4JOO JN23
091900  -8  583  CQ RC4AF LN28 (x3)
095115  -2  583  SP7ROM RC4AF -18 (x3)
095330 -11  583  CQ RC4AF LN28 (x2)
095430  -7  583  LY1MG RC4AF -04 (x2)
40m 
UTC    dB Audio  Message
020615  -2  540  RC4AF RG5A R+05 (x2)
020715 -11 2642  RC4AF F1PBZ -12 (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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