YU3A — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Serbia Most frequent locator attributed to this token: JN95

Receiver-side FT8 activity involving YU3A, decoded by SO8OO in southeastern Poland. 198 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 21 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-21.

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 198 FT8 messages attributed to YU3A as the transmitting token by decoded message structure across 21 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (34%), followed by 40 m (32%) and 20 m (27%). Most decodes (82%) 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

198

Messages attributed

UTC dates decoded

Active 15-min windows

-7 dB

Estimated median S/N

Bands

80m · 68 60m · 5 40m · 64 20m · 54 10m · 7

First attributed message: 2026-06-07
Last attributed message: 2026-09-21 16:15 UTC

Observed FT8 message patterns

Attributed sample: 198 messages
Active dates: 21 UTC dates
Estimated median S/N: -7 dB
Estimated 10th-90th percentile: -17 to +5 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 36, moderate (-15 to -9 dB) 61, strong (≥ -8 dB) 101.

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 YU3A in decoded directed-looking exchanges:

7Q3WS · Malawi R6ZEJ · European Russia RA6OB · European Russia 3A2MW · Monaco AK4AT · United States G4DBW · England R6SS · European Russia R70OBN · European Russia UA6HRB · European Russia DK8HC · Fed. Rep. of Germany GJ0KYZ · Jersey R6OBN · European Russia

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 YU3A

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: JN95 · 56 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 536 km (approx.)
Last such locator decoded: 2026-09-21 16:15 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	YU3A S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 16:15	40m	-4 / -	KH8WW	- / -	2	Partial capture
09-19 20:52	80m	+2 / -	RI1FJZ	- / -13	3	✓ Closing fragment
09-19 19:35	80m	- / -13	UB6OAJ	0 / -	2	✓ Closing fragment
09-15 19:40	40m	- / -8	GJ0KYZ	0 / -	2	✓ Closing fragment
09-15 19:39	40m	- / -9	R7ZY	+3 / -	2	✓ Closing fragment
09-15 19:14	40m	- / -23	UB6ODO	-8 / -	2	✓ Closing fragment
09-12 19:12	80m	+1 / -	VK1MA	- / +3	2	Partial capture
09-12 19:06	80m	+5 / -	VK6WTF	- / -11	3	Partial capture
09-12 18:59	80m	+16 / -	V51WH	- / -4	8	✓ Closing fragment
09-12 18:53	80m	-4 / -	V51WH	- / -19	3	Partial capture
08-26 06:52	20m	- / -11	3A2MW	-6 / -	2	✓ Closing fragment
07-28 20:54	20m	- / -3	G4DBW	-2 / -	3	✓ Closing fragment
07-27 14:18	20m	- / +2	R70OBN	-7 / -	2	✓ Closing fragment
07-18 18:41	40m	-2 / -	UB0SMX/P	- / -13	2	✓ Closing fragment
07-18 18:28	40m	-2 / -	T22TT	- / 0	8	Partial capture
07-18 18:11	40m	-15 / -	T22TT	- / -	17	Partial capture
07-18 17:58	40m	-4 / -	T22TT	- / -	16	Partial capture
07-13 06:25	20m	-16 / -	AK4AT	- / -	2	✓ Closing fragment
07-09 18:09	20m	- / -	UA6HRB	-3 / -	2	✓ Closing fragment
07-09 16:36	20m	- / -15	R6SS	-7 / -	2	✓ Closing fragment
07-07 19:06	20m	-5 / -	<...>	- / -16	3	Partial capture
07-07 17:54	10m	- / -13	RA6OB	-20 / -	2	✓ Closing fragment
07-06 07:15	20m	-10 / -	TI5RR	- / -16	2	Partial capture
06-29 19:38	20m	-12 / -	8A1WWA	- / -16	2	Partial capture
06-29 19:30	20m	-10 / -	8A1WWA	- / -15	7	Partial capture
06-28 15:21	10m	-14 / -	7Q3WS	- / -10	2	✓ Closing fragment
06-27 10:02	10m	-5 / -	R6ZEJ	- / -18	4	✓ Closing fragment
06-27 07:43	10m	- / -	UR5EPZ	-8 / -	2	Partial capture
06-27 02:24	40m	- / +7	R7OP	-16 / -	2	✓ Closing fragment
06-25 04:01	20m	-18 / -	T46FCR	- / -13	2	Partial capture
06-25 03:49	20m	-16 / -	T46FCR	- / -16	4	Partial capture

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
183245  -2 2750  T22TT YU3A R+00
184130  +0 2750  UB0SMX/P YU3A -13 (x2)
191415  -6  257  YU3A UB6ODO R-23
191415  +1  926  YU3A UA4FKT LO23
191445 -10  256  YU3A UB6ODO 73
192945  -5 1593  YU3A R6OBN 73
193145  -9 1301  YU3A TC2EYL 73
193900  +5 2378  YU3A R7ZY R-09 (x2)
194030  -4  983  YU3A GJ0KYZ -08
194030  -6  598  YU3A DK8HC 73
194100  +3  983  YU3A GJ0KYZ RR73
161515  -7 2738  KH8WW YU3A JN95 (x2)

80m

UTC    dB Audio  Message
190215 +18  720  V51WH YU3A -04 (x3)
190630  +5  720  VK6WTF YU3A -11 (x3)
190930  +4  720  VK1MA YU3A +03 (x3)
193500  +1  369  YU3A UB6OAJ R-13 (x2)
204945  -9  955  RI1FJZ YU3A -13 (x4)

20m

UTC    dB Audio  Message
190700  -7 2859  <...> YU3A -16
163630 -11 2724  YU3A R6SS R-15 (x2)
180945  -5 1271  YU3A UA6HRB LN14 (x2)
062530 -14 2225  AK4AT YU3A RR73 (x2)
141815  -9  416  YU3A R70OBN +02 (x2)
205430  +3 2171  YU3A G4DBW JO01 (x3)
201815  -1 1287  RO6OT YU3A -15
065230  -9 1841  YU3A 3A2MW R-11 (x2)

10m

UTC    dB Audio  Message
074315  -8 1515  YU3A UR5EPZ KN78 (x2)
100230  -6 2012  R6ZEJ YU3A -18 (x4)
152145 -11  753  7Q3WS YU3A -10 (x2)
175415 -19 1935  YU3A RA6OB R-13 (x2)

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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