KO4XJ — 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: United States Most frequent locator attributed to this token: EM57

Receiver-side FT8 activity involving KO4XJ, decoded by SO8OO in southeastern Poland. 46 FT8 messages attributed to this token as transmitter, on 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-06-19.

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 46 FT8 messages attributed to KO4XJ as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (70%); the estimated median was -6 dB.

Overview

46
Messages attributed
5
UTC dates decoded
8
Active 15-min windows
-6 dB
Estimated median S/N

Bands

20m · 46
First attributed message: 2026-06-07
Last attributed message: 2026-06-19 02:32 UTC

Observed FT8 message patterns

Attributed sample
46 messages
Active dates
5 UTC dates
Estimated median S/N
-6 dB
Estimated 10th-90th percentile
-18 to +1 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 9, strong (≥ -8 dB) 32.

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 KO4XJ in decoded directed-looking exchanges:

Most frequent locator attributed to KO4XJ

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
EM57 · 19 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,169 km (approx.)
Last such locator decoded
2026-06-19 02:32 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 UTCBandKO4XJ S/NCounterpartCounterpart S/NMsgsCapture
11-05 06:14 40m - / -19 OH5KNL +16 / - 5 ✓ Closing fragment
11-05 06:13 40m - / -12 DL7UHD -7 / - 3 ✓ Closing fragment
11-05 06:12 40m - / -21 IZ6KPR +7 / - 3 ✓ Closing fragment
11-05 05:58 40m - / -11 MI7XHT -12 / - 2 Partial capture
11-05 05:40 40m - / -22 F4JCU -5 / - 8 ✓ Closing fragment
11-05 05:39 40m - / -1 PI4DX -4 / - 2 ✓ Closing fragment
11-04 03:54 40m - / - IU2THY +13 / - 3 Partial capture
11-04 03:53 40m - / -15 ON3CL -2 / - 2 Partial capture
11-04 03:39 40m - / -15 RC9A -18 / - 3 ✓ Closing fragment
11-04 03:34 40m - / -14 RC9A -12 / - 3 ✓ Closing fragment
11-02 02:54 40m - / -6 5B4AMX -9 / - 2 ✓ Closing fragment
10-28 04:41 40m - / -12 EA5IT -7 / - 2 ✓ Closing fragment
10-28 04:08 40m - / -8 M8GSY -7 / - 5 ✓ Closing fragment
10-28 03:53 40m - / -12 SV1BLD +7 / - 4 ✓ Closing fragment
10-28 03:38 40m - / -13 F1PBZ +5 / - 4 Partial capture
10-27 04:10 40m - / -13 G3TKT -8 / - 2 ✓ Closing fragment
10-27 04:08 40m - / - SV5AZK -24 / - 2 Partial capture
10-27 03:46 40m - / -9 IZ8EYN -14 / - 4 Partial capture
10-19 04:59 60m - / -18 HA7TM +15 / - 3 ✓ Closing fragment
10-18 04:34 40m - / -15 YO6LM +6 / - 2 ✓ Closing fragment
09-30 04:10 60m - / -13 DB3ZY -6 / - 2 ✓ Closing fragment
09-20 04:00 40m - / -15 F5NBU +5 / - 3 ✓ Closing fragment
09-20 03:59 40m - / -9 F4VTR -6 / - 3 ✓ Closing fragment
09-20 03:55 40m - / -5 I6PJC -8 / - 2 Partial capture
09-20 03:55 40m - / - SV1MOZ -12 / - 2 Partial capture
09-14 04:48 40m - / - S52RZ -3 / - 11 Partial capture
09-14 04:23 60m - / - HA5CPN -14 / - 2 Partial capture
09-14 04:15 60m - / -15 DL2KBX 0 / - 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
054330  +0 1534  KO4XJ F4JCU R-22 (x2)
055845  -9  456  KO4XJ MI7XHT R-11 (x2)
061215  +0 3014  KO4XJ IZ6KPR JN63 (x3)
061315  -9  972  KO4XJ DL7UHD JO62 (x3)
061445 +16 2687  KO4XJ OH5KNL KP30 (x5)
60m 
UTC    dB Audio  Message
041130 -11  748  KO4XJ MI0NWA 73
041545  -1  816  KO4XJ DL2KBX R-15 (x2)
042315 -15  713  KO4XJ HA5CPN JN87 (x2)
041045 -14 2015  KO4XJ IK8PGE JN71
041045  -8 2191  KO4XJ DB3ZY R-13 (x2)
041145  -9 2284  KO4XJ F5OWT R-05
041315 -14 2015  KO4XJ IK8PGE R-09
045930 +15 2940  KO4XJ HA7TM R-18 (x3)
80m 
UTC    dB Audio  Message
040400  -8 1426  KO4XJ CT7AUT R-15

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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