YU1SR — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Serbia

Receiver-side FT8 activity involving YU1SR, decoded by SO8OO in southeastern Poland. 148 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 20 UTC dates in the available aggregate history. Observed between 2026-06-10 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 148 FT8 messages attributed to YU1SR as the transmitting token by decoded message structure across 20 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (41%), followed by 20 m (20%) and 80 m (16%). Most decodes (82%) fell within the six-hour window 19:00-01:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

148

Messages attributed

UTC dates decoded

Active 15-min windows

-10 dB

Estimated median S/N

Bands

80m · 23 60m · 21 40m · 60 20m · 30 10m · 14

First attributed message: 2026-06-10
Last attributed message: 2026-09-10 23:09 UTC

Observed FT8 message patterns

Attributed sample: 148 messages
Active dates: 20 UTC dates
Estimated median S/N: -10 dB
Estimated 10th-90th percentile: -17 to +3 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 67, strong (≥ -8 dB) 64.

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 YU1SR in decoded directed-looking exchanges:

DL3MIB · Fed. Rep. of Germany ×2 8Q7PR · Maldives IZ3EAW · Italy R0AX · Asiatic Russia R2AL · European Russia R4HHN · European Russia UD8S · Asiatic Russia 4O7CC · Montenegro 9H2TM · Malta D2ACE · Angola DK8HC · Fed. Rep. of Germany DL7ACA · 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.

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	YU1SR S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-10 23:06	60m	-12 / -	TF8KW	- / -14	5	✓ Closing fragment
08-15 00:36	80m	-18 / -	C31KC	- / -4	3	Partial capture
08-15 00:33	80m	-10 / -	RW9AW	- / +3	2	Partial capture
08-15 00:31	60m	-11 / -3	SE7LH	-14 / -	3	✓ Closing observed
08-09 22:44	80m	-1 / -15	R2FDU	+12 / -	2	✓ Closing observed
08-09 22:41	80m	-12 / -17	LB9ZG	-2 / -8	3	✓ Full exchange observed
08-09 22:36	60m	-8 / +2	OH6MW	+10 / +9	5	✓ Full exchange observed
08-09 22:36	60m	-3 / -	CE2SV	- / -18	2	Partial capture
08-09 22:34	60m	-3 / -	G4ZFJ	+2 / 0	3	Partial capture
08-09 22:33	60m	-4 / -8	4L7T	+2 / -3	4	✓ Full exchange observed
08-09 22:04	80m	-16 / -	TF4M	- / -4	2	✓ Closing fragment
08-09 22:01	80m	-11 / -20	UA4FKT	+8 / +6	6	✓ Full exchange observed
08-09 22:00	80m	-6 / -13	DL3MIB	+4 / +4	4	✓ Full exchange observed
08-09 21:58	80m	-9 / -13	5P1KZX	0 / -6	4	✓ Full exchange observed
08-09 19:03	20m	-12 / -11	8Q7PR	-22 / -8	5	✓ Full exchange observed
08-07 00:20	20m	-10 / -	RA0SCA	- / -10	3	Partial capture
08-01 02:00	60m	+5 / -	K4YT	- / -17	2	Partial capture
07-27 06:50	40m	- / +7	SP9UPH	+10 / -	2	✓ Closing fragment
07-21 23:31	80m	- / -	DO1WWA	-12 / -	3	Partial capture
07-21 23:31	80m	+6 / -9	HB9EFK	+18 / +5	4	✓ Full exchange observed
07-21 17:18	40m	-16 / -10	R2SN	-22 / +1	3	✓ Full exchange observed
07-17 22:17	20m	+4 / -	3W9A	- / -9	3	Partial capture
07-13 19:22	40m	-11 / -	ON4CHK/BOTA	- / -8	2	Partial capture
07-13 19:20	40m	-1 / -	YL3FW	- / -16	3	✓ Closing fragment
07-12 23:32	40m	- / -3	DL3MIB	-5 / -	3	✓ Closing fragment
07-12 23:23	40m	- / -16	DK8HC	-10 / -	3	✓ Closing fragment
07-12 23:22	40m	- / -16	4O7CC	-8 / -	2	✓ Closing fragment
07-12 21:57	20m	-16 / -	FK8HC	- / -18	2	Partial capture
07-12 14:12	20m	- / +6	R2AL	-3 / -	5	✓ Closing fragment
07-12 14:12	20m	- / -5	RL3K	-7 / -	4	Partial capture
07-12 14:11	20m	- / -10	R0AX	-15 / -	2	✓ Closing fragment
07-12 14:09	20m	- / -17	UD8S	-10 / -	2	✓ Closing fragment
06-29 22:55	40m	-22 / -8	DL7ACA	-9 / +5	5	✓ Full exchange observed
06-29 22:51	40m	-7 / -	DL7ACA	+1 / 0	2	Partial capture
06-29 22:51	40m	-14 / -5	OM0RX	-6 / +7	12	✓ Full exchange observed
06-29 22:51	40m	-6 / -	9H2TM	- / +7	2	✓ Closing fragment
06-28 17:27	40m	-9 / -	3D2USU	- / -13	3	Partial capture
06-28 17:25	40m	-6 / -	VK6EI	- / -16	2	✓ Closing fragment
06-28 17:16	20m	- / +6	IZ3EAW	-14 / -	3	✓ Closing fragment
06-28 17:15	20m	- / -10	R4HHN	-12 / -	2	✓ Closing fragment
06-28 00:13	60m	-16 / -12	OM5JG	+8 / +10	4	✓ Full exchange observed
06-28 00:08	40m	-8 / -	RA4FUT	-14 / 0	4	Partial capture
06-28 00:05	40m	-6 / -	TN8GD	- / -11	3	✓ Closing fragment
06-28 00:00	40m	-11 / -	VP2MAA	- / -8	5	✓ Closing fragment
06-23 00:44	60m	0 / -	PC5D	- / -9	2	Partial capture
06-23 00:39	40m	-1 / -	9J2FI	- / -16	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
223615  -2 2531  CE2SV YU1SR -18
223630 +13 2172  YU1SR OH6MW KP20
223645  -6 2531  OH6MW YU1SR +09
223700  +9 2172  YU1SR OH6MW R+02
223715  -9 2172  OH6MW YU1SR RR73
223730  +8 2172  YU1SR OH6MW 73
223815  -4 2532  CE2SV YU1SR -20
003145 -14 1224  YU1SR SE7LH R-03
003200 -11 1223  SE7LH YU1SR RR73
003215 -15 1224  YU1SR SE7LH 73
230615 -14  804  TF8KW YU1SR -14 (x5)

20m

UTC    dB Audio  Message
221745  +4  308  3W9A YU1SR -09 (x3)
014045 -11  942  YU1SR YO4NF -18
001845  -8 2167  WC9I YU1SR -13
002030 -12  746  RA0SCA YU1SR -10
002145 -19 1629  5N0YEN YU1SR -21
002230 -14 1629  RA0SCA YU1SR R-15 (x2)
190315 -15 2004  8Q7PR YU1SR -08
190400 -21 2005  YU1SR 8Q7PR R-11
190445  -9 2004  8Q7PR YU1SR RR73
190500 -22 2005  YU1SR 8Q7PR R+04
190515 -12 2005  8Q7PR YU1SR RR73
012945 -17 2131  YU1SR ZP5DVD R-12

80m

UTC    dB Audio  Message
220245 -10 1033  UA4FKT YU1SR RR73
220300 +10 1032  YU1SR UA4FKT 73
220415 -14 1443  TF4M YU1SR -04 (x2)
224130 -12 1052  LB9ZG YU1SR -08
224145  -3 1052  YU1SR LB9ZG R-17 (x2)
224300  -6 1906  MI7XHT YU1SR -11
224430 +12 2028  YU1SR R2FDU R-15
224445  -1 2028  R2FDU YU1SR RR73
003315 -12 1773  RW9AW YU1SR +03 (x2)
003630 -15 1381  C31KC YU1SR -04 (x3)

40m

UTC    dB Audio  Message
233230  -3 1069  YU1SR DL3MIB R-03 (x2)
192045  -2  533  YL3FW YU1SR -16 (x3)
192245 -11 1245  ON4CHK/BOTA YU1SR -08 (x2)
171845 -22 1835  YU1SR R2SN -10
171900 -19 1835  R2SN YU1SR R+01 (x2)
065045 +10 2315  YU1SR SP9UPH R+07 (x2)
003415 -13 2433  D2UY YU1SR -12
222530 -19 2140  D2ACE YU1SR RR73
222600 -10 2494  OH0ERF YU1SR +08

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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