KJ4PIU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM70

Receiver-side FT8 activity involving KJ4PIU, decoded by SO8OO in southeastern Poland. 19 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-08-23.

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 19 FT8 messages attributed to KJ4PIU 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%). In this small sample, the estimated median decoder S/N was -11 dB; no usual signal pattern is inferred.

Overview

19
Messages attributed
3
UTC dates decoded
9
Active 15-min windows
-11 dB
Estimated median S/N

Bands

20m · 19
First attributed message: 2026-06-08
Last attributed message: 2026-08-23 01:21 UTC

Observed FT8 message patterns

Attributed sample
19 messages
Active dates
3 UTC dates
Estimated median S/N
-11 dB
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 1, moderate (-15 to -9 dB) 14, strong (≥ -8 dB) 4.

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 KJ4PIU in decoded directed-looking exchanges:

Most frequent locator attributed to KJ4PIU

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
EM70 · 15 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,541 km (approx.)
Last such locator decoded
2026-08-23 01:18 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 UTCBandKJ4PIU S/NCounterpartCounterpart S/NMsgsCapture
09-20 14:11 40m - / - DK7ZT -15 / - 3 Partial capture
09-20 00:06 40m - / -6 F5NBU +12 / - 4 ✓ Closing fragment
08-23 01:52 40m - / - F1IQH -9 / - 3 Partial capture
08-23 01:44 40m - / -17 EI9KF -16 / - 2 ✓ Closing fragment
08-23 01:36 20m - / -5 OK1AYM +14 / - 4 ✓ Closing fragment
08-23 01:32 20m - / - PA4RFS -4 / - 4 Partial capture
08-23 01:19 20m -17 / - K8ATL -9 / -6 5 ✓ Full exchange observed
08-23 01:13 20m - / -4 KG4OJT -3 / - 3 ✓ Closing fragment
08-23 01:07 20m - / - DB3EH -11 / - 4 Partial capture
08-23 00:52 20m - / -14 UA6YW -14 / - 2 ✓ Closing fragment
08-23 00:46 20m - / -17 PD0RCQ -1 / - 5 ✓ Closing fragment
08-23 00:42 20m - / -15 PY5EJ -15 / - 6 ✓ Closing fragment
08-23 00:39 20m - / - PD0RCQ 0 / - 5 Partial capture
08-23 00:37 20m - / -16 PY5EJ -18 / - 3 Partial capture
08-09 03:31 40m - / -11 F5OYA/P -11 / - 2 Partial capture
08-09 03:18 40m - / -13 F5UOU -11 / - 2 ✓ Closing fragment
08-09 03:13 40m - / -16 EA2DYB -8 / - 2 Partial capture
08-06 01:39 20m - / - DL4GCJ -12 / - 2 Partial capture
08-06 01:16 20m - / -8 5B4AMX -20 / - 2 ✓ Closing fragment
08-03 02:22 40m - / -20 R7DX -21 / - 3 Partial capture
08-03 02:10 40m - / -13 F5PBG -8 / - 6 ✓ Closing fragment
08-03 01:18 20m - / -19 HZ1ES -8 / - 2 ✓ Closing fragment
08-02 23:44 20m - / -14 4L7T +2 / - 3 ✓ Closing fragment
07-25 23:25 20m - / -12 WV2B -16 / - 3 ✓ Closing fragment
07-19 02:39 20m - / - RK4H -14 / - 2 ✓ Closing fragment
07-19 02:10 20m - / -6 DL1R +2 / - 2 ✓ Closing fragment
07-19 02:03 20m - / - RD6OZ -12 / - 2 Partial capture
07-19 01:25 20m - / -18 R3KCW -14 / - 2 ✓ Closing fragment
07-19 01:17 20m - / -9 R2AL -10 / - 3 ✓ Closing fragment
07-19 01:09 20m - / -16 UA3DIB 0 / - 2 Partial capture
07-18 19:56 20m - / -14 F6BIA +8 / - 2 Partial capture
07-17 23:08 20m - / - EA7ALL -17 / - 3 Partial capture
07-17 23:06 20m - / -14 UT7UJ 0 / - 3 ✓ Closing fragment
07-16 01:04 40m - / - IZ8VYU -6 / - 2 ✓ Closing fragment
07-15 22:50 20m - / - IK1RQX +4 / - 3 Partial capture

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
014430 -15 2405  KJ4PIU EI9KF RR73
014800 -12 1148  KJ4PIU <...> R-11
015230  -9  949  KJ4PIU F1IQH JN27 (x3)
235300  +7 2080  KJ4PIU G0IUS -16
000600 +12  704  KJ4PIU F5NBU JN28
000630 +13  704  KJ4PIU IK6DLK JN63
000700 +13  704  KJ4PIU F5NBU JN28 (x3)
001100  -5  702  KJ4PIU F4CQS -18
141130 -14 1905  KJ4PIU DK7ZT +11 (x3)
20m 
UTC    dB Audio  Message
011400  -4  672  KJ4PIU KG4OJT 73
011815 -14  807  CQ KJ4PIU EM70
011930 -10  729  KJ4PIU K8ATL FM18 (x2)
012115 -17  756  K8ATL KJ4PIU -06
012200 -10  729  KJ4PIU K8ATL R+11 (x2)
013200  -8 1329  KJ4PIU PA4RFS JO21 (x4)
013600 +15  821  KJ4PIU OK1AYM JO70 (x4)

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