KF4USR — 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: FM05

Receiver-side FT8 activity involving KF4USR, decoded by SO8OO in southeastern Poland. 30 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-08-24 and 2026-08-26.

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 30 FT8 messages attributed to KF4USR as the transmitting token by decoded message structure across 3 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 moderate S/N range (63%); the estimated median was -13 dB.

Overview

30
Messages attributed
3
UTC dates decoded
6
Active 15-min windows
-13 dB
Estimated median S/N

Bands

20m · 30
First attributed message: 2026-08-24
Last attributed message: 2026-08-26 00:00 UTC

Observed FT8 message patterns

Attributed sample
30 messages
Active dates
3 UTC dates
Estimated median S/N
-13 dB
Estimated 10th-90th percentile
-20 to -11 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 8, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 3.

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 KF4USR in decoded directed-looking exchanges:

Most frequent locator attributed to KF4USR

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
FM05 · 11 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
7,754 km (approx.)
Last such locator decoded
2026-08-25 23:54 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 UTCBandKF4USR S/NCounterpartCounterpart S/NMsgsCapture
10-13 15:15 10m - / -5 EA5JKM -17 / - 5 Partial capture
08-26 23:03 40m - / -18 GB64MOD +8 / - 2 Partial capture
08-26 22:48 40m - / -24 CT7AUT -15 / - 3 Partial capture
08-26 12:39 20m - / - GJ0KYZ 0 / - 2 ✓ Closing fragment
08-25 23:56 20m -18 / - F5RAV - / -16 3 Partial capture
08-25 23:54 20m -10 / - SP4NKU - / -7 3 ✓ Closing fragment
08-25 23:49 20m -21 / - C6AZB - / +6 2 ✓ Closing fragment
08-24 22:34 20m -10 / - N4YSA - / - 2 Partial capture
08-24 22:32 20m -12 / - KJ5PWR - / - 2 Partial capture
08-24 22:17 20m -12 / - SP7IIT - / -4 5 ✓ Closing fragment
08-24 21:42 20m -15 / - KF8BRC - / - 3 Partial capture
08-24 21:40 20m -13 / - PA1AA -19 / -6 5 ✓ Closing observed
08-24 21:39 20m -13 / - KE0CNA - / +2 2 ✓ Closing fragment
08-24 16:46 20m - / -14 OE5CCN -9 / - 3 ✓ Closing fragment
08-20 00:14 20m - / -12 XQ1KK -2 / - 2 ✓ Closing fragment
08-19 23:46 20m - / -12 F1PBZ +7 / - 3 Partial capture
08-19 23:26 20m - / -7 TI5RR -8 / - 2 ✓ Closing fragment
08-11 20:33 10m - / -15 CE2SV -1 / - 2 ✓ Closing fragment
08-11 00:30 40m - / - S52D -10 / - 2 Partial capture
08-11 00:21 40m - / -16 YO6LM +5 / - 5 ✓ Closing fragment
08-10 23:42 20m - / -16 YO4NF -1 / - 3 ✓ Closing fragment
08-10 23:36 20m - / - HB9TIH -19 / - 3 Partial capture
08-10 23:22 20m - / -15 WV2B -9 / - 2 Partial capture
08-10 23:21 20m - / -4 9A5E -8 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

10m 
UTC    dB Audio  Message
203300  -1 2601  KF4USR CE2SV -15 (x2)
151545 -17 1907  KF4USR EA5JKM -05 (x5)
40m 
UTC    dB Audio  Message
001745  +8 2796  KF4USR YO6LM -15
001745 -17 2225  KF4USR IK6DLK JN63
002145  +7 2796  KF4USR YO6LM -16 (x5)
003045 -11 2213  KF4USR S52D JN76 (x2)
224800 -14 1476  KF4USR CT7AUT -24 (x3)
230345  +8 1379  KF4USR GB64MOD -18 (x2)
235130 -16 2085  KF4USR KE4YOG RR73
20m 
UTC    dB Audio  Message
223245 -11 2063  KJ5PWR KF4USR FM05
223445  -8 2529  N4YSA KF4USR FM05 (x2)
234945 -20 1704  C6AZB KF4USR R+06 (x2)
235430 -12 1704  SP4NKU KF4USR FM05 (x3)
235630 -18 1704  F5RAV KF4USR -16 (x4)
000030 -16 1704  KF9TS KF4USR +01
123915  +0 2252  KF4USR GJ0KYZ IN89 (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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