KK4ISJ — 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 KK4ISJ, decoded by SO8OO in southeastern Poland. 34 FT8 messages attributed to this token as transmitter, on 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-18 and 2026-09-22.

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 34 FT8 messages attributed to KK4ISJ as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). In this small sample, the estimated median decoder S/N was -10 dB; no usual signal pattern is inferred.

Overview

34
Messages attributed
2
UTC dates decoded
7
Active 15-min windows
-10 dB
Estimated median S/N

Bands

40m · 34
First attributed message: 2026-09-18
Last attributed message: 2026-09-22 00:59 UTC

Observed FT8 message patterns

Attributed sample
34 messages
Active dates
2 UTC dates
Estimated median S/N
-10 dB
Estimated 10th-90th percentile
-17 to -8 dB
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 8.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with KK4ISJ in decoded directed-looking exchanges:

Most frequent locator attributed to KK4ISJ

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 · 6 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
7,754 km (approx.)
Last such locator decoded
2026-09-22 00:52 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 UTCBandKK4ISJ S/NCounterpartCounterpart S/NMsgsCapture
10-13 04:03 80m - / -15 ON8DM +12 / - 2 Partial capture
10-13 03:52 80m - / -9 CT7AUT -6 / - 2 ✓ Closing fragment
09-22 01:05 40m - / -14 IU8RFW +7 / - 9 Partial capture
09-22 00:58 40m -11 / -9 CT2HEX -6 / -13 5 ✓ Full exchange observed
09-22 00:52 40m -14 / - W4DR - / - 2 ✓ Closing fragment
09-22 00:49 40m - / +7 WA9BZW -16 / - 2 ✓ Closing fragment
09-22 00:28 40m -8 / - KE4YOG -10 / - 4 ✓ Full exchange observed
09-22 00:27 40m - / - PE1NPS -6 / - 4 Partial capture
09-22 00:25 40m -8 / +1 F4DIA +1 / -5 5 ✓ Full exchange observed
09-22 00:24 40m -9 / - KB8KLK - / -5 3 ✓ Closing fragment
09-22 00:22 40m -8 / -2 WA3YZD -22 / -3 5 ✓ Full exchange observed
09-22 00:21 40m -9 / - N4UCU - / +6 3 ✓ Closing fragment
09-22 00:16 40m - / - IU8RFW +4 / - 5 Partial capture
09-18 04:27 40m - / -8 HB9TIH -4 / - 2 ✓ Closing fragment
09-18 04:14 40m - / -14 EI2IXB -10 / - 2 ✓ Closing fragment
09-18 04:06 40m -21 / -5 F4IFO +6 / - 3 ✓ Closing observed
09-18 04:03 40m - / +6 US1VM +9 / - 5 Partial capture
09-18 04:03 40m - / -12 YO4NF +3 / - 2 Partial capture
09-18 04:03 40m - / -10 F5NBU +10 / - 3 ✓ Closing fragment
09-18 03:59 40m - / -19 F5MOO +8 / - 2 ✓ Closing fragment
09-18 03:55 40m - / +3 GM6URC -21 / - 2 Partial capture
09-18 03:48 40m -16 / -11 EA5D -22 / - 3 ✓ Closing observed
09-18 03:47 40m -18 / - DL3MIB - / -4 2 ✓ Closing fragment
09-18 03:45 40m -17 / -13 F5PBG -8 / -16 6 ✓ Full exchange observed
09-18 03:44 40m -15 / -16 IW9FRA -13 / -13 3 ✓ Full exchange observed
09-18 03:42 40m -9 / - KE9END - / +2 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
035200  -9 1477  KK4ISJ CT7AUT -09 (x2)
040300 +11  796  KK4ISJ ON8DM JO10 (x2)
40m 
UTC    dB Audio  Message
005845  -8  731  KK4ISJ CT2HEX IM58
005900 -10  450  CT2HEX KK4ISJ -13
005915  -4  731  KK4ISJ CT2HEX R-09
005930 -12  450  CT2HEX KK4ISJ RR73
005945  -5  731  KK4ISJ CT2HEX 73
010200 -13  294  KK4ISJ KF4AH +08
010530  +5  448  KK4ISJ IU8RFW JN70 (x9)

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

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee