KM4JB — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: FM05

Receiver-side FT8 activity involving KM4JB, decoded by SO8OO in southeastern Poland. 100 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-08-24.

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 100 FT8 messages attributed to KM4JB as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (37%), followed by 80 m (32%) and 40 m (31%). 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 weak S/N range (72%); the estimated median was -19 dB.

Overview

100

Messages attributed

UTC dates decoded

Active 15-min windows

-19 dB

Estimated median S/N

Bands

80m · 32 40m · 31 20m · 37

First attributed message: 2026-06-06
Last attributed message: 2026-08-24 02:02 UTC

Observed FT8 message patterns

Attributed sample: 100 messages
Active dates: 10 UTC dates
Estimated median S/N: -19 dB
Estimated 10th-90th percentile: -24 to -12 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 72, moderate (-15 to -9 dB) 25, 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 KM4JB in decoded directed-looking exchanges:

F1PBZ · France ×2 W4R · United States ×2 9A4ZM · Croatia A71QQ · Qatar R3KCW · European Russia AG0Y · United States F5HNQ · France IQ4JO · Italy IZ8DBJ · Italy KD2WBX · United States KJ5PTH · United States R6DZL · European Russia

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to KM4JB

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 · 49 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 7,754 km (approx.)
Last such locator decoded: 2026-08-24 01:52 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 UTC	Band	KM4JB S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-24 02:04	40m	- / -	RA4ABH	-2 / -	3	Partial capture
08-24 02:04	40m	- / -	RG6ZF	-3 / -	3	Partial capture
08-24 02:02	40m	- / -	UA6AKW	-3 / -	4	Partial capture
08-24 01:59	40m	-13 / -	AG0Y	- / -7	3	✓ Closing fragment
08-24 01:59	40m	- / -	UR9QQ	-18 / -	3	Partial capture
08-24 01:55	40m	-14 / -10	R6FY	+2 / -16	9	✓ Full exchange observed
08-24 01:54	40m	-12 / -	YL2EA	- / -25	3	✓ Closing fragment
08-24 01:54	40m	- / -13	R7KM	-6 / -	9	Partial capture
08-24 01:53	40m	-12 / -4	F1PBZ	-14 / -15	4	✓ Full exchange observed
08-24 01:52	40m	-12 / -5	R6DZL	-5 / -22	5	✓ Full exchange observed
08-24 01:51	40m	- / -	UR9QQ	-19 / -	8	Partial capture
08-24 01:51	40m	- / -	UA4CPM	+9 / -	3	Partial capture
08-24 01:50	40m	- / -	G1VHD	-15 / -	2	Partial capture
08-24 01:50	40m	-11 / -	KD2WBX	- / -	3	✓ Closing fragment
08-24 01:49	40m	- / -11	R7KM	-12 / -	2	Partial capture
08-24 01:49	40m	- / -5	EI2IXB	-8 / -	2	Partial capture
08-24 01:48	40m	-12 / -5	F5HNQ	-2 / -7	4	✓ Full exchange observed
08-13 23:28	20m	-21 / -	T42FCR	- / +2	2	Partial capture
08-05 00:19	40m	- / -13	RN6MA	-12 / -	3	Partial capture
08-05 00:13	40m	- / -	DM2AB	-19 / -	3	Partial capture
08-05 00:06	40m	- / -12	RN6MA	-12 / -	3	Partial capture
08-05 00:03	40m	- / -	OK1TRJ	-8 / -	3	Partial capture
08-04 23:52	40m	- / -16	RN6MA	-12 / -	3	Partial capture
08-04 23:40	40m	- / -18	UA6AR	-3 / -	3	✓ Closing fragment
08-04 23:39	40m	- / -4	F1PBZ	-10 / -	2	Partial capture
08-04 23:32	40m	- / -	UA3DIB	-16 / -	2	Partial capture
08-04 23:16	40m	- / -	YO6LM	-19 / -	2	✓ Closing fragment
08-04 23:12	40m	- / -6	YO6LM	-10 / -	2	Partial capture
08-04 23:08	40m	- / -8	YO6LM	-16 / -	2	Partial capture
08-04 23:04	40m	- / -12	YO6LM	-15 / -	2	Partial capture
08-04 00:18	40m	- / -	M7LYG	-18 / -	2	Partial capture
08-03 23:48	20m	- / -18	A71QQ	-14 / -	2	✓ Closing fragment
08-01 02:32	80m	-18 / -	W4R	- / 0	3	✓ Closing fragment
08-01 02:30	80m	-24 / -	K8BL	- / -7	3	✓ Closing fragment
08-01 02:28	80m	- / -17	EU3AA	+8 / -	2	✓ Closing fragment
08-01 02:26	80m	-20 / -	TL8GD	- / -	2	Partial capture
07-31 02:22	40m	- / -20	R2EN	-16 / -	2	Partial capture
07-31 02:18	40m	- / -	RN6HK	-14 / -	3	Partial capture
07-31 01:50	80m	- / -	RX6DA	+3 / -	8	Partial capture
07-31 01:47	80m	- / -	9A5E	+18 / -	8	Partial capture
07-31 01:45	80m	- / -	UT7AA	+18 / -	7	Partial capture
07-31 01:40	80m	- / -	LA6VQ	-8 / -	2	Partial capture
07-31 01:38	80m	- / +10	N9ZJ	-18 / -	3	✓ Closing fragment
07-31 01:35	80m	- / -	UT7AA	+20 / -	3	Partial capture
07-31 01:33	80m	-24 / -	KD4EXS	- / +8	2	✓ Closing fragment
07-27 00:52	20m	- / -3	9A4ZM	-11 / -	3	✓ Closing fragment
07-27 00:39	20m	- / -1	9A4ZM	-14 / -	3	Partial capture
07-17 02:08	40m	- / -11	4X5MZ	-6 / -	2	Partial capture
07-17 01:59	40m	- / -	R6FX	-18 / -	2	Partial capture
07-17 01:58	40m	- / -9	IZ8DBJ	-14 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
020115 -21 1794  KM4JB UR9QQ KN77 (x2)
020200 -17 1900  KE2GLH KM4JB -09
020215 -22 1638  KM4JB LZ3RG KN12
020245  -6 1996  KM4JB UA6AKW LN05
020245 -19 1901  KM4JB IK6DLK JN63
020315  -3 1995  KM4JB UA6AKW LN05 (x3)
020415  -4 1055  KM4JB RG6ZF KN98 (x2)
020445  +1 1901  KM4JB RA4ABH LO20
020515  -2 1056  KM4JB RG6ZF KN98
020515  -5 1901  KM4JB RA4ABH LO20 (x2)

20m

UTC    dB Audio  Message
003945 -13 2222  KM4JB 9A4ZM JN86 (x6)
010900 -18 2279  R3KCW KM4JB RR73
234845 -17 1193  KM4JB A71QQ -18 (x2)
225045  -4 2773  KM4JB F1PBZ RR73
232600 -24 1596  KP4MBG KM4JB FM05
232800 -22 1595  T42FCR KM4JB FM05 (x2)
233115 -21 1904  DL3HN KM4JB FM05

80m

UTC    dB Audio  Message
015300 -24 1757  CQ KM4JB FM05
015315  +3 1592  KM4JB RX6DA KN85 (x3)
015800 -24 1844  XE2N KM4JB FM05
022630 -21 1845  TL8GD KM4JB FM05 (x2)
022815  +9 1743  KM4JB EU3AA -17 (x2)
023030 -24 1659  K8BL KM4JB FM05 (x3)
023200 -18 1659  W4R KM4JB FM05 (x3)

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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