K4FB — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EL97

Receiver-side FT8 activity involving K4FB, decoded by SO8OO in southeastern Poland. 47 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-16 and 2026-09-23.

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 47 FT8 messages attributed to K4FB as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (89%), followed by 20 m (11%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.

Overview

47
Messages attributed
3
UTC dates decoded
11
Active 15-min windows
-15 dB
Estimated median S/N

Bands

40m · 42 20m · 5
First attributed message: 2026-06-16
Last attributed message: 2026-09-23 03:30 UTC

Observed FT8 message patterns

Attributed sample
47 messages
Active dates
3 UTC dates
Estimated median S/N
-15 dB
Estimated 10th-90th percentile
-19 to -11 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 21, moderate (-15 to -9 dB) 25, strong (≥ -8 dB) 1.

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 K4FB in decoded directed-looking exchanges:

Most frequent locator attributed to K4FB

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
EL97 · 21 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,549 km (approx.)
Last such locator decoded
2026-09-23 03:15 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 UTCBandK4FB S/NCounterpartCounterpart S/NMsgsCapture
09-28 03:22 40m - / -3 F4LFG -5 / - 6 ✓ Closing fragment
09-28 03:18 40m - / - F4PCM -8 / - 2 ✓ Closing fragment
09-28 02:59 40m - / -13 IW2ODG -6 / - 2 ✓ Closing fragment
09-28 02:52 40m - / - EA3HMM -6 / - 3 Partial capture
09-28 02:52 40m - / - DM1EE -7 / - 3 Partial capture
09-28 02:51 40m - / -15 IW2ODG -2 / - 2 Partial capture
09-28 02:48 40m - / -2 DK5WL +1 / - 3 ✓ Closing fragment
09-28 02:48 40m - / +2 F1PBZ +3 / - 4 ✓ Closing fragment
09-28 02:44 40m - / -14 PA3KUS 0 / - 2 Partial capture
09-23 03:30 40m -16 / - KC9WCJ - / -2 2 ✓ Closing fragment
09-23 03:16 40m - / - RN6HK -2 / - 3 Partial capture
09-23 03:14 40m - / -15 RD7LC +10 / - 2 ✓ Closing fragment
09-23 03:10 40m - / -2 G4PEY +2 / - 3 ✓ Closing fragment
09-23 03:06 40m -13 / - RN6HK -3 / -4 2 Partial capture
09-23 03:00 40m - / -14 RZ6L +10 / - 3 ✓ Closing fragment
09-23 02:56 40m - / - TA3NK -12 / - 9 Partial capture
09-23 02:53 40m -12 / - WB7GR - / - 3 Partial capture
09-23 02:51 40m -13 / - K9CMG - / -15 3 ✓ Closing fragment
09-23 02:49 40m -14 / - US5EAA - / -10 2 ✓ Closing fragment
09-23 02:48 40m -10 / - PA1CG - / -8 2 ✓ Closing fragment
09-23 02:42 40m -15 / -14 EK1KE -10 / -10 11 ✓ Full exchange observed
09-23 02:36 40m - / -18 RA4CX +10 / - 6 ✓ Closing fragment
09-23 02:32 40m - / - RA4CX +8 / - 3 Partial capture
09-23 02:16 40m -18 / -16 R4CY -2 / -7 4 Partial capture
09-23 02:15 40m -17 / - SP7NC - / -5 2 ✓ Closing fragment
09-23 02:09 40m -18 / - ZA5G - / - 2 Partial capture
09-23 00:42 40m -15 / - SM7TZK - / -10 2 ✓ Closing fragment
09-23 00:38 40m -18 / - HA1BF - / 0 4 ✓ Closing fragment
09-23 00:35 40m -16 / - WD4DIY - / - 2 ✓ Closing fragment
08-03 01:09 20m - / -11 A71QQ -3 / - 2 ✓ Closing fragment
08-01 01:11 40m - / -20 F5RRS -13 / - 5 ✓ Closing fragment
07-31 03:19 20m - / - RA4ABH -3 / - 3 Partial capture
07-31 03:02 20m - / - DH2RL -15 / - 3 Partial capture
07-07 00:58 20m - / -6 <...> -9 / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
025315  -6 1052  K4FB DM1EE JO31
025345  -6  226  K4FB EA3HMM JN00
025915  -5 1115  K4FB IW2ODG -13 (x2)
030315  -4 1406  K4FB IU3WNU -16
031145 -17 1757  K4FB IK8OAM 73
031545  -2 1754  K4FB IU3WNU -18
031845 -11 1755  K4FB F4PCM JN23 (x2)
032245  -4 2631  K4FB F4LFG IN98 (x6)
20m 
UTC    dB Audio  Message
005800  -8  301  K4FB <...> -06 (x2)
011815 -15 1250  K4FB F5MXH R-13
225800 -24 1599  K4FB OY1R -15
231100 +13 2891  K4FB TM74TFR -15
030200  +1 1108  K4FB R4IK -14
030230 -18 1107  K4FB DH2RL JN68 (x3)
031430  +2 1145  K4FB RA4ABH LO20 (x4)
010915  +1 1446  K4FB A71QQ -11 (x2)

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