KJ4QVJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EL98

Receiver-side FT8 activity involving KJ4QVJ, decoded by SO8OO in southeastern Poland. 265 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 20 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-09-15.

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 265 FT8 messages attributed to KJ4QVJ as the transmitting token by decoded message structure across 20 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (62%), followed by 80 m (28%) and 40 m (10%). Most decodes (99%) fell within the six-hour window 00:00-06:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

265

Messages attributed

UTC dates decoded

Active 15-min windows

-10 dB

Estimated median S/N

Bands

80m · 74 40m · 27 20m · 164

First attributed message: 2026-06-09
Last attributed message: 2026-09-15 03:43 UTC

Observed FT8 message patterns

Attributed sample: 265 messages
Active dates: 20 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -20 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 76, moderate (-15 to -9 dB) 74, strong (≥ -8 dB) 115.

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 KJ4QVJ in decoded directed-looking exchanges:

PI4DX · Netherlands ×3 F4HTA · France ×2 UT5ZC · Ukraine ×2 CR7BRV · Portugal ×2 CT7AUT · Portugal ×2 HB9EFK · Switzerland ×2 4L1MA · Georgia 4X1UF · Israel 5P1KZX · Denmark 7Z1BQ · Saudi Arabia 7Z1DS · Saudi Arabia A61CK · United Arab Emirates

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 KJ4QVJ

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: EL98 · 102 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,464 km (approx.)
Last such locator decoded: 2026-09-15 03:34 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	KJ4QVJ S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-15 05:45	80m	- / -11	ON7HM	-16 / -	5	✓ Closing fragment
09-15 05:37	80m	- / -10	DL3OCF	+11 / -	2	Partial capture
09-15 03:41	80m	- / -4	CT7AUT	-23 / -	2	✓ Closing fragment
09-15 03:38	80m	- / -12	LY7T	+16 / -	8	Partial capture
09-15 03:37	80m	- / -	F4FPR	-16 / -	3	Partial capture
09-15 03:36	80m	- / -	HA5CPN	-6 / -	2	Partial capture
09-15 03:35	80m	-18 / +1	ON3ANY	-4 / -11	5	✓ Full exchange observed
09-15 03:34	80m	-19 / -	II9IAGM	- / -	2	Partial capture
09-15 03:32	80m	-16 / -	KY6AA	- / -18	3	✓ Closing fragment
09-15 03:28	80m	-20 / -14	GU4WRP	-19 / -25	5	✓ Full exchange observed
09-15 03:27	80m	- / -	F4IIX	-12 / -	5	Partial capture
09-15 03:26	80m	- / -10	F1PBZ	+5 / -	2	✓ Closing fragment
09-15 03:21	80m	-24 / -	G7RHF	- / -19	2	Partial capture
09-10 05:22	80m	- / -4	PI4DX	-14 / -	2	✓ Closing fragment
09-10 05:19	80m	- / -8	F5NLY	-22 / -	4	✓ Closing fragment
09-10 05:15	80m	- / -15	F5OIH	-16 / -	2	✓ Closing fragment
09-10 05:14	80m	- / -	EA7ALL	-14 / -	2	Partial capture
09-10 05:07	80m	- / -14	ON7GB	+2 / -	4	Partial capture
09-10 05:04	80m	- / -	ON7GB	+2 / -	2	Partial capture
09-10 04:41	40m	- / -	YO6QDY	-20 / -	2	Partial capture
09-10 04:33	40m	-12 / -	AB9UZ	- / -8	5	Partial capture
09-10 04:28	40m	-17 / -	CR7BRV	-12 / -	2	✓ Closing observed
09-10 04:22	40m	-8 / -6	YO9IAB	+6 / -	4	✓ Closing observed
09-06 02:56	40m	- / 0	PV8AJ	-12 / -	2	✓ Closing fragment
09-06 02:54	40m	-18 / -	OZ7KJ/P	- / -10	2	✓ Closing fragment
09-06 02:52	40m	-17 / -	OZ3FYN/P	- / -	2	Partial capture
09-06 02:50	40m	-20 / 0	CT7AUT	-15 / -	3	✓ Closing observed
08-29 05:26	40m	- / -	F5MNW	-12 / -	2	Partial capture
08-29 05:26	40m	- / 0	G0BLB	-15 / -	4	✓ Closing fragment
08-29 05:26	40m	- / -10	OE9DAI	+2 / -	11	✓ Closing fragment
08-29 05:18	80m	- / -	DG8NCO	+10 / -	4	Partial capture
08-29 04:19	40m	- / -9	IZ2FZZ	-17 / -	3	Partial capture
08-29 04:14	40m	- / -	UW5ZM	+8 / -	5	Partial capture
08-29 04:04	80m	- / -	OM0AGP	-2 / -	3	Partial capture
08-29 03:59	80m	- / -11	F5LOW	-14 / -	2	✓ Closing fragment
08-29 03:58	80m	- / -	DL1GLO	-9 / -	8	Partial capture
08-29 03:54	80m	- / -24	S58MU	-9 / -	5	✓ Closing fragment
08-29 03:52	80m	- / -10	LY7M	-9 / -	3	✓ Closing fragment
08-26 01:15	20m	+1 / -	KF8DQU	- / -9	3	✓ Closing fragment
08-26 01:12	20m	-3 / -	7Z1DS	- / -4	4	✓ Closing fragment
08-26 01:10	20m	-14 / -	W0OVX	- / -9	2	✓ Closing fragment
08-26 01:08	20m	+1 / -	F4HTA	- / -9	4	✓ Closing fragment
08-26 01:06	20m	-11 / -	WS7M	- / +2	3	✓ Closing fragment
08-23 06:49	20m	- / -	IU5TUG	-4 / -	2	Partial capture
08-23 06:40	20m	- / -	DF1KG	-9 / -	6	Partial capture
08-23 06:39	20m	- / -	ON7DJ	-8 / -	2	Partial capture
08-23 05:56	20m	-16 / -	DM3XD	- / -11	2	✓ Closing fragment
08-23 05:52	20m	0 / -	T77BL	- / -8	2	✓ Closing fragment
08-23 05:10	80m	- / -12	PI4DX	-2 / -	11	✓ Closing fragment
08-23 05:06	40m	- / -9	PE1NAO	-12 / -	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
034215 +19 2054  KJ4QVJ LY7T R-12 (x2)
034315 -11  533  KK5JY KJ4QVJ -08
034330 -14  865  KJ4QVJ ON3ANY JO10
053600  +0 1385  KJ4QVJ SN40KZE -18
053700 +10  306  KJ4QVJ DL3OCF -10 (x2)
054200  -9  677  KJ4QVJ IU1TLG JN35
054230 -15 2369  KJ4QVJ ON7HM -04 (x6)
055900 -20 1260  KJ4QVJ ON1JP -15

40m

UTC    dB Audio  Message
042245  +3 2784  KJ4QVJ YO9IAB RR73
042300 -11 2786  YO9IAB KJ4QVJ 73
042430  -9 2788  EA1CQ KJ4QVJ 73
042845 -12  891  KJ4QVJ CR7BRV RR73
042900 -17  893  CR7BRV KJ4QVJ 73
042915  +5 2535  KJ4QVJ YO6LM KN25
043300 -10  864  AB9UZ KJ4QVJ -08 (x5)
044145 -21 1125  KJ4QVJ YO6QDY KN26 (x2)
044730  -3 1640  KJ4QVJ IZ8XJJ JN70
050030 -19 1970  KJ4QVJ IZ2QPP R-09

20m

UTC    dB Audio  Message
010630  -9 1143  WS7M KJ4QVJ R+02 (x2)
010800  +2  765  F4HTA KJ4QVJ EL98 (x4)
011030  -9 2008  W0OVX KJ4QVJ -09 (x2)
011230  -5  802  7Z1DS KJ4QVJ EL98 (x4)
011530  +0  499  KF8DQU KJ4QVJ EL98 (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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