YU4FQN — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Serbia Most frequent locator attributed to this token: KN04

Receiver-side FT8 activity involving YU4FQN, decoded by SO8OO in southeastern Poland. 248 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 28 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-09-18.

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 248 FT8 messages attributed to YU4FQN as the transmitting token by decoded message structure across 28 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (45%), followed by 20 m (24%) and 40 m (20%). Most decodes (61%) fell within the six-hour window 13:00-19:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

248

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

80m · 28 40m · 49 20m · 59 10m · 112

First attributed message: 2026-06-17
Last attributed message: 2026-09-18 09:26 UTC

Observed FT8 message patterns

Attributed sample: 248 messages
Active dates: 28 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -22 to -6 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 98, moderate (-15 to -9 dB) 102, strong (≥ -8 dB) 48.

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 YU4FQN in decoded directed-looking exchanges:

F5CUN · France ×2 RN6MA · European Russia ×2 F1PBZ · France ×2 ON1DGN · Belgium ×2 E75C · Bosnia-Herzegovina ×2 IK4RVY · Italy ×2 IQ4JO · Italy ×2 S53AK · Slovenia ×2 DF6QN · Fed. Rep. of Germany DF6WE · Fed. Rep. of Germany DJ5FS · Fed. Rep. of Germany DN9AVK · Fed. Rep. of Germany

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 YU4FQN

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: KN04 · 140 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 608 km (approx.)
Last such locator decoded: 2026-09-18 09:26 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	YU4FQN S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-18 08:49	40m	-21 / -	OM8BCD	- / -23	3	✓ Closing fragment
09-15 15:50	40m	- / +4	DF8RU	+5 / -	4	✓ Closing fragment
09-15 09:58	40m	- / -12	UT4PA	-9 / -	3	✓ Closing fragment
09-15 09:54	40m	- / +2	S55OO	-8 / -	4	✓ Closing fragment
09-15 09:53	40m	- / -19	S53AK	-6 / -	2	✓ Closing fragment
09-15 08:46	40m	-16 / -3	9A7BB	-10 / -2	3	✓ Full exchange observed
09-15 08:43	40m	- / -12	HA5KN	+3 / -	3	✓ Closing fragment
09-15 00:04	80m	- / -13	HA7TM	+12 / -	3	Partial capture
09-14 22:57	40m	- / -23	F5RRS	+6 / -	4	✓ Closing fragment
09-14 22:45	40m	- / -15	IS0CAK	-10 / -	2	✓ Closing fragment
09-14 21:27	40m	- / -17	2E0UMK	-13 / -	3	✓ Closing fragment
09-14 21:27	40m	- / -	DL1UDO	-1 / -	4	Partial capture
09-14 13:31	40m	-10 / -	OK1XLE	- / -	6	Partial capture
09-14 13:27	40m	-17 / -	IZ4AIF	- / -	3	Partial capture
09-14 13:04	40m	- / +5	HG8LXL	-7 / -	4	✓ Closing fragment
09-14 09:45	40m	- / -7	OE6OCG	-6 / -	2	✓ Closing fragment
09-14 09:42	40m	-18 / +8	HA0AA	-5 / -	3	✓ Closing observed
09-14 09:35	40m	- / -20	OK2PM	-7 / -	3	✓ Closing fragment
09-14 09:32	40m	- / -5	YO3GNF	-4 / -	4	Partial capture
09-14 07:01	40m	- / -4	E75C	-8 / -	4	✓ Closing fragment
09-14 01:38	80m	- / -24	UX7QV	+3 / -	6	✓ Closing fragment
09-14 01:21	40m	- / -	RA6HTU	-12 / -	2	Partial capture
09-14 01:09	40m	- / -21	RN6HK	+10 / -	5	✓ Closing fragment
09-14 01:05	40m	- / -21	DL3MIB	-4 / -	5	✓ Closing fragment
09-14 00:25	80m	- / -18	IK6GTF	-14 / -	3	✓ Closing fragment
09-14 00:20	80m	- / -15	9A4ZM	-2 / -	3	✓ Closing fragment
09-14 00:17	80m	- / -18	OK1HEH	-8 / -	2	✓ Closing fragment
09-13 23:10	40m	- / -	CT2HEX	-4 / -	4	Partial capture
09-13 23:07	40m	- / -21	R4HLO	-16 / -	4	Partial capture
09-13 08:54	40m	- / -19	SP7FID	+7 / -	2	✓ Closing fragment
09-13 08:51	40m	- / +5	9A5DM	0 / -	2	✓ Closing fragment
09-13 08:46	40m	- / -7	HA3HZ	-19 / -	3	✓ Closing fragment
09-13 08:43	40m	-21 / -2	YO4FJK	-17 / +1	4	✓ Full exchange observed
09-13 08:41	40m	- / -6	HA3TBL	-4 / -	2	✓ Closing fragment
09-13 08:37	40m	- / -12	SQ9BDB	-8 / -	4	✓ Closing fragment
09-12 22:47	40m	- / -24	R6LPF	-4 / -	3	✓ Closing fragment
09-12 22:43	40m	- / -10	RZ6AKF	+9 / -	3	✓ Closing fragment
09-12 22:31	40m	- / -14	ON1DGN	-14 / -	3	✓ Closing fragment
09-12 22:30	40m	- / -	RA6OY	+10 / -	4	Partial capture
09-12 22:29	40m	- / -	PD7BDN	-6 / -	2	✓ Closing fragment
09-12 22:22	40m	- / -19	R7ZY	+10 / -	3	✓ Closing fragment
09-12 22:15	40m	- / -13	DK6AH	+4 / -	4	✓ Closing fragment
09-12 22:11	40m	- / -19	DL7ACA	+5 / -	3	✓ Closing fragment
09-12 18:01	80m	- / -13	IQ4JO	-1 / -	4	✓ Closing fragment
09-12 17:59	80m	- / -7	YO2MAX	+14 / -	2	✓ Closing fragment
09-12 17:51	80m	-13 / -16	YO2MNZ	+4 / -	3	✓ Closing observed
09-12 17:28	40m	- / -10	IZ7NLJ	-6 / -	2	✓ Closing fragment
09-12 01:59	40m	- / -6	5B4AMM	+4 / -	2	✓ Closing fragment
09-12 01:35	80m	-7 / -12	YO3GNF	-4 / -	4	Partial capture
09-12 01:33	80m	-8 / -13	HA7TM	+15 / -	3	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
153515 -15  894  CQ YU4FQN KN04
155030  +7 1559  YU4FQN DF8RU JN68 (x4)
091230 -24 1571  CQ YU4FQN KN04 (x6)
084945 -19 1387  OM8BCD YU4FQN -23 (x3)
092600 -21 2318  OZ9FF YU4FQN KN04

80m

UTC    dB Audio  Message
002845 -10  809  CQ YU4FQN KN04 (x5)
013845  +1 1285  YU4FQN UX7QV KN29 (x6)
014415 -17  933  CQ YU4FQN KN04
000430  -3 2704  YU4FQN HA7TM -13 (x3)

10m

UTC    dB Audio  Message
172700 +17 2710  YU4FQN DF6QN RR73
094730 -13 1847  YU4FQN PD4FL JO33 (x5)
102500 -23 2022  YU4FQN DO2MS 73
105300 -22 1659  YU4FQN PD1WAT R-17 (x2)
183200 -19 1223  YU4FQN CT3MD R-07
090315 -14  757  DF6WE YU4FQN -16 (x3)
090545 -14  853  F5JAE YU4FQN RR73
165145 -22 1995  YU4FQN OH2FQV KP20

20m

UTC    dB Audio  Message
132245  +4 1932  YU4FQN F5IXN 73
132345 -12 2083  YU4FQN PD9FLX JO22
132415  +7 1528  YU4FQN R6DRW KN93
132415  -7 2083  YU4FQN PD9FLX R-16
132445  +0 1528  YU4FQN R6DRW KN93
101945  +1 2030  YU4FQN GJ0KYZ IN89 (x4)
123245  -4 1778  YU4FQN PD0PWH R-04
123615 -16 2460  YU4FQN UT4QM KN77
130045  -6 1804  YU4FQN F4NPW JN26 (x4)

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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