NO4J — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM90

Receiver-side FT8 activity involving NO4J, decoded by SO8OO in southeastern Poland. 40 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-08-24 and 2026-09-19.

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 40 FT8 messages attributed to NO4J as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (50%), followed by 80 m (28%) and 40 m (23%). Several six-hour UTC windows tied for the largest share (50%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -15 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-15 dB

Estimated median S/N

Bands

80m · 11 40m · 9 20m · 20

First attributed message: 2026-08-24
Last attributed message: 2026-09-19 02:42 UTC

Observed FT8 message patterns

Attributed sample: 40 messages
Active dates: 4 UTC dates
Estimated median S/N: -15 dB
Estimated 10th-90th percentile: -24 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 17, strong (≥ -8 dB) 6.

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 NO4J in decoded directed-looking exchanges:

UA3QNA · European Russia ×2 EA1FJD · Spain EA5ITW · Spain EB3JT · Spain EW8CW · Belarus G5MJF · England M7TPT · England SP6AXW · Poland VK3EVE · Australia YB8CMT · Indonesia 9K2WA · Kuwait CN8NS · Morocco

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 NO4J

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: EM90 · 6 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,294 km (approx.)
Last such locator decoded: 2026-09-19 02:31 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	NO4J S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-19 02:42	40m	-21 / -3	9K2WA	-6 / -6	3	✓ Full exchange observed
09-19 02:36	40m	-20 / -9	UB6C	+10 / -14	5	✓ Full exchange observed
09-19 02:33	40m	- / -	F4HXJ	-2 / -	7	Partial capture
09-19 02:31	40m	-24 / -	HA3KZ	- / -12	2	Partial capture
08-31 08:26	20m	- / -	F4JQH	-10 / -	2	Partial capture
08-28 09:10	20m	- / -	PD3PAM	-15 / -	6	Partial capture
08-28 09:09	20m	-11 / -	G5MJF	- / -13	2	✓ Closing fragment
08-28 09:08	20m	-7 / -	M7PHE	- / -12	2	Partial capture
08-28 09:07	20m	-8 / -15	EA5ITW	-2 / -16	6	✓ Full exchange observed
08-28 09:06	20m	-10 / -	EW4TT	- / -	2	Partial capture
08-28 09:01	20m	-12 / -	EA1FJD	-8 / 0	3	✓ Closing observed
08-28 09:01	20m	-16 / -	SP6AXW	- / -9	2	✓ Closing fragment
08-28 09:00	20m	-16 / -	VK3EVE	- / -15	2	✓ Closing fragment
08-28 08:58	20m	-18 / -11	UA3QNA	+17 / -	4	✓ Closing observed
08-28 08:52	20m	-12 / -	EW6DM/P	- / -	2	Partial capture
08-28 07:37	20m	- / -8	IZ7QFP	+2 / -	2	Partial capture
08-27 02:22	80m	- / -12	UT3UZ	+12 / -	9	Partial capture
08-27 02:14	80m	-20 / -15	OK1AMF	+9 / -22	7	✓ Full exchange observed
08-27 02:14	80m	- / -12	UT3UZ	+12 / -	11	Partial capture
08-27 02:11	80m	-21 / -	HI4T	- / -6	3	✓ Closing fragment
08-27 02:10	80m	- / -12	CX1UI	-24 / -	2	Partial capture
08-27 02:09	80m	-16 / -	W5RB	- / +1	2	✓ Closing fragment
08-27 02:09	80m	- / -	F5MYK	-4 / -	2	Partial capture
08-27 02:08	80m	-16 / -	WB8SCG	-24 / +10	3	✓ Closing observed
08-27 02:06	80m	-22 / -	PY6HD	-11 / -15	2	✓ Closing observed
08-26 10:21	20m	- / -6	M7TPT	-17 / -	2	✓ Closing fragment
08-26 08:28	20m	- / -13	PD0WL	+8 / -	2	Partial capture
08-26 08:02	20m	- / -	M7PHE	-13 / -	7	Partial capture
08-25 09:41	20m	- / -	IU3BIX	+2 / -	4	Partial capture
08-25 09:40	20m	- / -	GJ0KYZ	-6 / -	2	Partial capture
08-24 01:53	40m	-11 / -	RA2FCF	- / -7	3	✓ Closing fragment
08-06 01:19	40m	- / -14	UA4CPM	-2 / -	4	✓ Closing fragment
07-31 01:43	40m	- / -	R2EN	-19 / -	2	✓ Closing fragment
07-28 01:39	40m	- / -15	R6OK	-12 / -	2	Partial capture
07-25 02:18	40m	- / +4	TK5K	-16 / -	2	✓ Closing fragment
07-23 03:08	40m	- / -	DL3MIB	-12 / -	3	Partial capture
07-21 02:23	40m	- / -7	DL9KM	-19 / -	3	✓ Closing fragment
07-21 02:17	40m	- / -	IK6DLK	-13 / -	3	Partial capture
07-21 02:09	40m	- / -14	S55DX	-8 / -	2	✓ Closing fragment
07-13 03:21	40m	- / -19	SP6AMI	-16 / -	3	✓ Closing fragment
07-13 03:18	40m	- / -7	Z31CZ	-16 / -	2	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
023400  -1 2996  NO4J F4HXJ IN87 (x3)
023615 -24 2062  W9MDM NO4J RR73
023630  +5 2539  NO4J UB6C KN94
023630  -1 2996  NO4J F4HXJ IN87
023645 -15 2062  UB6C NO4J -14
023700  -3 2996  NO4J F4HXJ IN87
023715 -24 2063  UB6C NO4J -14
023730 +14 2539  NO4J UB6C R-09 (x2)
023800  -7 2996  NO4J F4HXJ IN87
024200  -8 1797  NO4J 9K2WA -03
024215 -21 2063  9K2WA NO4J R-06
024230  -4 1797  NO4J 9K2WA RR73

20m

UTC    dB Audio  Message
090830  +1  317  NO4J EA5ITW RR73
090845  -5 1414  M7PHE NO4J -12 (x2)
090945  -9 1414  G5MJF NO4J R-13
091000 -19 2264  NO4J PD3PAM JO32
091015 -13 1414  G5MJF NO4J 73
091030 -23 2264  NO4J PD3PAM JO32
091045  -8 1414  BD4SDO NO4J -15
091100 -16 2264  NO4J PD3PAM JO32 (x4)
082630 -12 1106  NO4J F4JQH JN12 (x2)
084515  -7 2406  NO4J EW8CW RR73

80m

UTC    dB Audio  Message
021700  +4 1901  NO4J OK1AMF RR73
021730  +6  800  NO4J UT3UZ -12 (x5)
022245 -13  839  NO4J F5LOW -10
022300 +13  800  NO4J UT3UZ -12 (x8)

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee