KP4USA — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Puerto Rico Most frequent locator attributed to this token: EL89

Receiver-side FT8 activity involving KP4USA, decoded by SO8OO in southeastern Poland. 7 FT8 messages attributed to this token as transmitter, on 40m, across 2 UTC dates in the available aggregate history. Observed between 2026-09-05 and 2026-09-12.

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 7 FT8 messages attributed to KP4USA 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 -11 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

40m · 7

First attributed message: 2026-09-05
Last attributed message: 2026-09-12 03:02 UTC

Observed FT8 message patterns

Attributed sample: 7 messages
Active dates: 2 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) 3, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 2.

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 KP4USA in decoded directed-looking exchanges:

PI4DX · Netherlands ×2 5B4AMM · Cyprus DL3MIB · Fed. Rep. of Germany F5RRS · France K8TUK · United States SV9QWC · Crete EA4HPY · Spain LX1JX · Luxembourg KB2UKA · United States

Most frequent locator attributed to KP4USA

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: EL89 · 2 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,504 km (approx.)
Last such locator decoded: 2026-09-12 02:58 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 UTC	Band	KP4USA S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-12 22:50	60m	- / -	F6AOJ	+7 / -	3	Partial capture
09-12 02:59	40m	-16 / -	K8TUK	- / -	2	✓ Closing fragment
09-12 02:58	40m	-8 / -7	5B4AMM	+8 / +8	4	✓ Full exchange observed
09-08 23:48	80m	- / -14	PI4DX	-2 / -	2	✓ Closing fragment
09-08 23:39	40m	- / -	EB3JT	0 / -	7	Partial capture
09-05 23:21	40m	-14 / -	MW0UPH	- / -14	2	Partial capture
09-03 23:36	60m	- / -11	EA4HPY	+6 / -	2	✓ Closing fragment
09-03 23:27	40m	- / -13	SV9QWC	+2 / -	4	✓ Closing fragment
08-29 23:33	60m	- / -6	PI4DX	+4 / -	2	✓ Closing fragment
08-29 23:31	60m	- / -	LX1JX	+3 / -	2	✓ Closing fragment
08-05 23:39	40m	- / -15	DL3MIB	-5 / -	3	✓ Closing fragment
08-05 23:39	40m	- / -17	F5RRS	-17 / -	2	✓ Closing fragment
07-27 23:31	40m	- / -16	UT5ZC	-8 / -	3	Partial capture
07-27 00:25	80m	- / -11	KB2UKA	-14 / -	4	✓ Closing fragment
07-08 00:54	40m	- / -18	YR50NADIA	-14 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
233100  +2 2705  KP4USA LX1JX RR73 (x2)
233330  +6 1975  KP4USA PI4DX -06 (x2)
233645  +4  804  KP4USA EA4HPY -11 (x2)
225015  +7 2315  KP4USA F6AOJ JN08 (x3)

40m

UTC    dB Audio  Message
232145 -11  409  MW0UPH KP4USA R-14
233900  -2  788  KP4USA EB3JT JN01 (x7)
025815  -7 2704  5B4AMM KP4USA EL89
025830  +4 2704  KP4USA 5B4AMM -07
025845 -10 2704  5B4AMM KP4USA R+08
025900 +11 2704  KP4USA 5B4AMM RR73
025945 -16 1110  K8TUK KP4USA +14 (x2)
030215  -8 2662  DL1SRS KP4USA -17

80m

UTC    dB Audio  Message
002530 -17 1503  KP4USA KB2UKA -11 (x4)
234830  -4  979  KP4USA PI4DX -14 (x2)

20m

UTC    dB Audio  Message
222130  -4  835  KP4USA M9KTM RRR

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.

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