YU3RS — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving YU3RS, decoded by SO8OO in southeastern Poland. 383 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 17 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-10.

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 383 FT8 messages attributed to YU3RS as the transmitting token by decoded message structure across 17 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (58%), followed by 20 m (42%). Most decodes (52%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -7 dB.

Overview

383

Messages attributed

UTC dates decoded

Active 15-min windows

-7 dB

Estimated median S/N

Bands

40m · 223 20m · 160

First attributed message: 2026-06-06
Last attributed message: 2026-09-10 06:29 UTC

Observed FT8 message patterns

Attributed sample: 383 messages
Active dates: 17 UTC dates
Estimated median S/N: -7 dB
Estimated 10th-90th percentile: -14 to +7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 28, moderate (-15 to -9 dB) 128, strong (≥ -8 dB) 227.

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 YU3RS in decoded directed-looking exchanges:

II3WWA · Italy ×4 SN0WWA · Poland ×4 DA0WWA · Fed. Rep. of Germany ×3 II0WWA · Italy ×3 TM8WWA · France ×3 GB2WWA · England ×2 II4WWA · Italy ×2 A61DD · United Arab Emirates ×2 CT3IQ · Madeira Islands ×2 II5WWA · Italy ×2 II6WWA · Italy ×2 R3SN · European Russia ×2

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 YU3RS

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 · 197 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 608 km (approx.)
Last such locator decoded: 2026-09-10 06:29 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	YU3RS S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-20 23:27	40m	- / -1	G8KHF	+7 / -	4	Partial capture
09-20 23:02	40m	- / -6	NF1O	-8 / -	2	Partial capture
09-20 22:58	40m	- / -11	JY5IB	-19 / -	2	Partial capture
09-20 22:54	40m	- / -5	EA5KB	-7 / -	2	✓ Closing fragment
09-20 22:44	40m	- / -7	A61DD	-1 / -	13	✓ Closing fragment
09-20 22:43	40m	- / -	EB3JT	-5 / -	7	Partial capture
09-20 22:42	40m	- / -4	R3SN	0 / -	2	✓ Closing fragment
09-20 22:38	40m	- / -8	CT3IQ	-18 / -	4	✓ Closing fragment
09-20 22:33	40m	- / -15	A61DD	-3 / -	10	Partial capture
09-20 22:23	40m	- / -14	A61DD	-5 / -	6	✓ Closing fragment
09-20 22:19	40m	- / -5	M0OVG	-7 / -	7	✓ Closing fragment
09-20 22:17	40m	- / -6	EA1Y	-19 / -	2	Partial capture
09-20 22:00	40m	- / -	BI1LWV	-16 / -	2	Partial capture
09-20 22:00	40m	- / -2	PD4RJ	-22 / -	2	Partial capture
09-20 21:53	40m	- / -9	RY3F	+2 / -	2	✓ Closing fragment
09-20 21:52	40m	- / -	HZ1TT	-6 / -	2	✓ Closing fragment
09-10 06:26	40m	-9 / -14	HB9XBY	-9 / -	9	Partial capture
09-10 06:20	40m	-8 / -5	GJ0KYZ	-1 / -17	7	✓ Full exchange observed
09-10 06:08	40m	-10 / -14	ON4AOI	-2 / -	4	✓ Closing observed
09-06 23:29	40m	-16 / -	PD0LBY	-4 / -18	5	Partial capture
09-06 23:28	40m	- / -	N1SSN	-16 / -	9	Partial capture
09-06 23:27	40m	-18 / -	F5PBG	-2 / -17	7	Partial capture
09-06 23:26	40m	-18 / -	SP6SR	- / -	2	✓ Closing fragment
09-06 23:25	40m	-20 / -	SP3SWJ	- / -14	2	✓ Closing fragment
09-06 23:23	40m	-16 / -6	CR7BRV	-3 / -17	4	✓ Full exchange observed
09-06 22:27	40m	- / +2	R4ZZ	-12 / -	3	✓ Closing fragment
09-06 22:27	40m	- / -	RL3K	-12 / -	5	Partial capture
09-06 22:25	40m	- / -13	YO4NF	+6 / -	2	Partial capture
09-06 22:24	40m	- / -	F5PBG	-8 / -	4	Partial capture
09-06 22:24	40m	-18 / -4	R2EA	+2 / -	3	✓ Closing observed
09-06 22:14	40m	- / -	PD0LBY	-7 / -	7	Partial capture
09-06 22:13	40m	- / +3	SM7TZK	-5 / -	3	✓ Closing fragment
09-06 22:12	40m	- / -15	YO4NF	+8 / -	2	Partial capture
09-05 08:12	40m	-4 / -	OE5GTE	- / -	11	Partial capture
09-05 08:10	40m	-6 / 0	F4DIA	-21 / -19	4	✓ Full exchange observed
09-04 22:10	40m	- / -12	R4HHN	-6 / -	2	✓ Closing fragment
09-04 22:09	40m	- / -	EB3JT	-20 / -	4	Partial capture
09-04 22:08	40m	- / -	UT0IN	-2 / -	2	Partial capture
09-04 22:04	40m	- / -16	4X1UF	-18 / -	6	✓ Closing fragment
09-04 22:00	40m	- / 0	I1RJP	-2 / -	2	✓ Closing fragment
09-04 21:57	40m	- / -9	RN3YN	+3 / -	9	Partial capture
09-04 21:49	40m	- / -21	EX7CQ	-8 / -	7	✓ Closing fragment
08-12 06:07	20m	-11 / -	M7MJW	- / -24	3	✓ Closing fragment
08-10 22:44	20m	-4 / -7	SV5BYP	-15 / -	2	Partial capture
08-10 22:39	20m	-8 / -	N1FST	- / -22	4	✓ Closing fragment
08-10 22:31	20m	-6 / -	OH0ERF	- / -22	5	✓ Closing fragment
08-10 22:27	20m	-2 / -	OH0ERF	- / -	4	Partial capture
08-10 22:25	20m	-2 / -	ON4CBK	- / -	4	Partial capture
08-10 22:21	20m	-2 / -	JA5XAE	- / -	7	Partial capture
08-10 21:28	40m	-12 / -	F1PBZ	- / -19	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
224815  +1  777  YU3RS A61DD -09 (x5)
225430  -5 1519  YU3RS EA5KB -05 (x2)
225800 -17 1645  YU3RS JY5IB -11 (x2)
230230  -8 2038  YU3RS NF1O -06 (x2)
232730  +4  650  YU3RS G8KHF -01 (x4)

20m

UTC    dB Audio  Message
223300  -9 1378  OH0ERF YU3RS KN04 (x4)
223745  -6 1378  EA6C YU3RS KN04
223930  -7 1378  N1FST YU3RS KN04 (x4)
224415  -4  902  SV5BYP YU3RS KN04
224430 -15 1809  YU3RS SV5BYP -07
224645  -9  902  JA1XIA YU3RS -13
060700 -10 1191  M7MJW YU3RS R-24 (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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