YU4EA — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving YU4EA, decoded by SO8OO in southeastern Poland. 132 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 7 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-08-07.

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 132 FT8 messages attributed to YU4EA as the transmitting token by decoded message structure across 7 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (50%), followed by 40 m (42%) and 80 m (8%). Most decodes (70%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -6 dB.

Overview

132

Messages attributed

UTC dates decoded

Active 15-min windows

-6 dB

Estimated median S/N

Bands

80m · 11 40m · 55 20m · 66

First attributed message: 2026-06-13
Last attributed message: 2026-08-07 00:02 UTC

Observed FT8 message patterns

Attributed sample: 132 messages
Active dates: 7 UTC dates
Estimated median S/N: -6 dB
Estimated 10th-90th percentile: -19 to +9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 25, moderate (-15 to -9 dB) 32, strong (≥ -8 dB) 75.

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 YU4EA in decoded directed-looking exchanges:

9A4ZM · Croatia ×2 YO4NF · Romania ×2 A71UN · Qatar M0BEW · England PD1SL · Netherlands 2E0ROJ · England 9K2OK · Kuwait CT1BFP · Portugal CT3MD · Madeira Islands F1ODM · France F1PBZ · France F4FSY · France

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 YU4EA

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 · 42 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 608 km (approx.)
Last such locator decoded: 2026-08-07 00:02 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	YU4EA S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-16 15:17	20m	- / -18	M0KQV	-20 / -	2	✓ Closing fragment
08-16 13:04	10m	- / 0	M0BEW	-8 / -	2	✓ Closing fragment
08-16 10:27	20m	- / +10	IK4LZH	+6 / -	5	✓ Closing fragment
08-07 06:28	20m	- / +1	F5HNQ	+5 / -	3	✓ Closing fragment
08-07 06:20	40m	- / -	DL6UM	-10 / -	4	Partial capture
08-07 06:20	40m	- / -3	SQ8GBG	-17 / -	2	✓ Closing fragment
08-07 00:01	20m	-18 / -	5N0YEN	- / -	3	Partial capture
08-06 23:57	20m	- / -1	CT3MD	-10 / -	2	✓ Closing fragment
08-06 23:07	20m	-6 / -	YV5BRB	- / -	2	Partial capture
08-06 23:04	20m	-14 / -	TA2EE	- / -12	3	Partial capture
08-06 23:02	20m	-16 / -	<...>	- / -16	2	Partial capture
08-06 23:01	20m	-8 / -	VE7SA	- / -	2	Partial capture
08-06 22:57	20m	-22 / -	W4HTP	- / -13	2	Partial capture
08-06 22:55	20m	-18 / -	AA9JC	- / -8	5	Partial capture
08-06 22:43	20m	- / -	9A4ZM	-9 / -	2	✓ Closing fragment
08-06 22:41	20m	-2 / +7	T77RN	-6 / -	4	✓ Full exchange observed
08-06 20:51	40m	- / -14	EW8AAC	-18 / -	4	✓ Closing fragment
08-06 20:41	40m	- / -14	E77EA	-13 / -	6	✓ Closing fragment
08-03 07:28	20m	- / 0	LX1ER	+8 / -	2	✓ Closing fragment
08-03 06:26	20m	- / -9	TK5KP	-16 / -	2	✓ Closing fragment
08-03 00:17	40m	- / -18	CU6AB	-17 / -	2	✓ Closing fragment
08-03 00:02	40m	- / -	F5RRS	-12 / -	6	✓ Closing fragment
08-02 13:31	20m	- / -1	PA3BMB	-7 / -	3	✓ Closing fragment
08-01 08:07	20m	-18 / -	UA2FFD	- / -	3	Partial capture
08-01 08:06	20m	-8 / -	MI0NWA	- / -16	2	✓ Closing fragment
08-01 08:03	20m	-14 / -	RC9WC	- / -15	3	✓ Closing fragment
08-01 08:02	20m	-18 / 0	F1PBZ	-4 / -	4	✓ Full exchange observed
08-01 07:58	20m	-16 / -2	ON1JP	-23 / -4	4	✓ Full exchange observed
08-01 07:58	20m	-18 / -	UA3LRN	- / -7	2	Partial capture
07-31 22:56	20m	- / -10	TN8GD	-9 / -	2	✓ Closing fragment
07-31 21:48	20m	- / -8	9K2OK	-17 / -	2	✓ Closing fragment
07-31 16:03	20m	- / +2	F4FSY	-13 / -	2	✓ Closing fragment
07-31 06:25	20m	-9 / -	LA6VQ	- / -	3	Partial capture
07-31 06:23	20m	-9 / -3	PE1NPS	-5 / -	4	✓ Closing observed
07-31 06:05	20m	-11 / -	IQ4JO	- / -	4	Partial capture
07-31 06:03	20m	-12 / -3	RX3ASQ	-9 / -5	6	✓ Full exchange observed
07-30 20:50	20m	- / -16	CT1BFP	-8 / -	3	✓ Closing fragment
07-26 20:29	20m	- / -12	F1ODM	-6 / -	4	✓ Closing fragment
07-26 20:26	20m	- / -1	R4FDW	-18 / -	3	Partial capture
07-26 20:26	20m	- / -	RA6OY	-4 / -	4	Partial capture
07-26 20:19	80m	+6 / -	DS5USH	- / -	5	Partial capture
07-26 20:04	40m	- / -4	OZ3AEV	+8 / -	2	✓ Closing fragment
07-26 19:59	40m	-1 / -	UN7PPV	- / -16	3	Partial capture
07-26 19:58	40m	-2 / -	DL8ZAD	- / -14	2	Partial capture
07-26 19:57	40m	-3 / -4	R5AV	+2 / -	3	✓ Closing observed
07-26 19:55	40m	-6 / -	EA1IOK	- / -	2	Partial capture
07-26 19:52	40m	-4 / -	ZL1VAH	- / -19	2	Partial capture
07-26 19:20	40m	-9 / -	R1BDX	-10 / 0	4	✓ Closing observed
07-26 19:18	40m	- / -10	SP7TF	+1 / -	2	✓ Closing fragment
07-26 19:16	80m	+11 / -	E70SZ	+13 / -	5	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
000245 -17 1629  5N0YEN YU4EA KN04
062815  +4 2402  YU4EA F5HNQ IN98 (x3)
102715  -1  462  YU4EA IK4LZH JN54 (x3)
102815 -15 1120  YU4EA DK4CH JN59
102845  +9  462  YU4EA IK4LZH R+10 (x2)
103215  +8 1120  YU4EA UT7UJ +00
150400  +7 2450  YU4EA MD0CCE RR73
151000 -16 2449  YU4EA UA4FEN -14
151700 -20 1746  YU4EA M0KQV R-18 (x2)

10m

UTC    dB Audio  Message
181430 -16 2482  YU4EA DN9AD JO52
181600 -11  676  YU4EA PD1SL RR73
181700 -16 2483  YU4EA DN9AD R-19
064600 -10 1120  YU4EA A71UN RR73
114015 -22 1508  YU4EA RK4FF -10
130445 -10 1132  YU4EA M0BEW +00 (x2)

40m

UTC    dB Audio  Message
204430  -9 1680  YU4EA E77EA 73
204645 -14 1250  CQ YU4EA KN04
205100 -17 1250  YU4EA EW8AAC -14 (x4)
233415 -21 1960  CQ YU4EA KN04
233530  -8 1970  YU4EA S52D 73
233945 -11  514  TJ1GD/P YU4EA R-12
062030 -16 1537  YU4EA SQ8GBG R-03
062030 -12  925  YU4EA DL6UM JO60
062100 -18 1537  YU4EA SQ8GBG 73
062100 -12  926  YU4EA DL6UM JO60 (x3)

80m

UTC    dB Audio  Message
175245  +9  994  YU4EA RC6OD -17
175300  +3  995  RC6OD YU4EA R-02
175315  +9  994  YU4EA RC6OD RR73
175330  +3  995  RC6OD YU4EA 73
191600 +12  412  CQ YU4EA KN04
191615 +17  413  YU4EA E70SZ JN84
191630 +11  412  E70SZ YU4EA +17
191645 +17  413  YU4EA E70SZ R+16
191700 +11  412  E70SZ YU4EA RRR
191715  +5  413  YU4EA E70SZ 73
201945  +4  377  DS5USH YU4EA KN04 (x5)

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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