KB3ZUM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: FM19

Receiver-side FT8 activity involving KB3ZUM, decoded by SO8OO in southeastern Poland. 22 FT8 messages attributed to this token as transmitter, on 20m, across 2 UTC dates in the available aggregate history. Observed between 2026-08-22 and 2026-08-28.

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 22 FT8 messages attributed to KB3ZUM as the transmitting token by decoded message structure across 2 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 -15 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

20m · 22

First attributed message: 2026-08-22
Last attributed message: 2026-08-28 02:06 UTC

Observed FT8 message patterns

Attributed sample: 22 messages
Active dates: 2 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -20 to -10 dB
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 9, moderate (-15 to -9 dB) 12, strong (≥ -8 dB) 1.

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 KB3ZUM in decoded directed-looking exchanges:

DA0LH · Fed. Rep. of Germany G5TV · England OK2CNI · Czech Republic PY5EJ · Brazil R5AJ · European Russia TJ1GD · Cameroon V31DL · Belize

Most frequent locator attributed to KB3ZUM

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: FM19 · 9 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,310 km (approx.)
Last such locator decoded: 2026-08-28 01:51 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	KB3ZUM S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-30 21:01	20m	- / -	PD8L	-16 / -	2	Partial capture
08-28 02:05	20m	-10 / -	TJ1GD	- / -16	2	✓ Closing fragment
08-28 01:59	20m	-20 / -	EX8ABC	- / -	2	Partial capture
08-28 01:55	20m	-20 / -	EX8ABC	- / -22	2	Partial capture
08-28 01:53	20m	-17 / -	HK3AB	- / -9	2	Partial capture
08-28 01:46	20m	-13 / -8	V31DL	-10 / -4	5	✓ Full exchange observed
08-22 23:19	20m	- / -	IW2MYH	-4 / -	3	Partial capture
08-22 23:15	20m	- / -	SP6AXW	-1 / -	3	Partial capture
08-22 23:15	20m	- / -	IK2ZJR	+1 / -	6	Partial capture
08-22 03:45	20m	- / -	PD0RCQ	-11 / -	5	Partial capture
08-22 03:40	20m	- / -11	HB9TIH	-4 / -	8	Partial capture
08-22 03:40	20m	- / -	YT1DDL	-19 / -	3	Partial capture
08-22 03:30	20m	- / -	PD0RCQ	-11 / -	2	Partial capture
08-16 18:41	20m	- / -12	DA0LH	-7 / -	2	✓ Closing fragment
08-10 19:32	20m	- / -9	G5TV	-21 / -	3	✓ Closing fragment
08-09 20:42	20m	- / -	M7HDY	-18 / -	3	Partial capture
06-29 00:11	20m	- / -8	A71UN	-11 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
014930 -19 2126  F1PBZ KB3ZUM R-10
015100 -21 2146  CQ KB3ZUM FM19                        a1
015130 -20 2151  DK7ZT KB3ZUM R-05
015300 -19 2152  HK3AB KB3ZUM R-09 (x2)
015530 -20 2152  EX8ABC KB3ZUM -22 (x4)
020545 -10  578  TJ1GD KB3ZUM R-16 (x2)
210100 -17 1936  KB3ZUM PD8L JO21 (x2)
210500 -10 2714  KB3ZUM IZ0GRR JN61
210800  +4 2272  KB3ZUM IT9BCC -19

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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