YU7AS — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Serbia Most frequent locator attributed to this token: KN05

Receiver-side FT8 activity involving YU7AS, decoded by SO8OO in southeastern Poland. 5,057 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 96 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-20.

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 5,057 FT8 messages attributed to YU7AS as the transmitting token by decoded message structure across 96 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (67%), followed by 40 m (29%) and 20 m (4%). Most decodes (67%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (83%); the estimated median was +4.9 dB.

Overview

5,057
Messages attributed
96
UTC dates decoded
493
Active 15-min windows
+4.9 dB
Estimated median S/N

Bands

80m · 3,368 40m · 1,453 20m · 216 10m · 20
First attributed message: 2026-06-06
Last attributed message: 2026-09-20 08:04 UTC

Observed FT8 message patterns

Attributed sample
5,057 messages
Active dates
96 UTC dates
Estimated median S/N
+4.9 dB
Estimated 10th-90th percentile
-13.3 to +14 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 367, moderate (-15 to -9 dB) 517, strong (≥ -8 dB) 4,173.

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 YU7AS in decoded directed-looking exchanges:

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 YU7AS

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
KN05 · 3,018 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
497 km (approx.)
Last such locator decoded
2026-09-20 08:04 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 UTCBandYU7AS S/NCounterpartCounterpart S/NMsgsCapture
09-20 07:53 40m -11 / - SP9DPI - / -20 12 ✓ Closing fragment
09-20 07:49 40m -8 / - IZ0ZZV - / -21 2 ✓ Closing fragment
09-20 07:37 40m -14 / -5 IW5EED -18 / - 2 ✓ Closing observed
09-20 07:31 40m - / -16 SP2EOE 0 / - 2 ✓ Closing fragment
09-20 07:26 40m -16 / -11 SP3MIP -5 / +1 5 ✓ Full exchange observed
09-20 03:39 80m +17 / -19 HI8R -8 / -15 4 ✓ Full exchange observed
09-20 03:38 80m - / - EU7A +14 / - 2 Partial capture
09-20 03:33 80m +15 / - G1CEC -12 / -19 4 ✓ Closing observed
09-20 03:31 80m +14 / -5 EA2DYB -6 / -13 5 ✓ Full exchange observed
09-19 23:04 80m +13 / +6 IU2WCY -6 / -15 6 ✓ Full exchange observed
09-19 01:44 40m - / -1 F4LFG -5 / - 3 Partial capture
09-19 01:43 40m - / -25 W4PSK -8 / - 2 ✓ Closing fragment
09-19 01:40 80m - / - SK3GA -18 / - 2 Partial capture
09-18 23:00 80m +10 / -4 DO9BLX +3 / -16 6 ✓ Full exchange observed
09-18 22:58 80m +12 / -14 UT4EK 0 / -16 6 ✓ Full exchange observed
09-18 22:52 80m +13 / - S51SLO +8 / -14 5 ✓ Full exchange observed
09-18 19:03 40m -2 / - SQ5FM - / -21 2 Partial capture
09-18 19:01 40m -6 / -13 LA8ENA -4 / -20 4 ✓ Full exchange observed
09-18 19:00 40m -4 / - SQ5FM - / - 2 Partial capture
09-18 18:58 40m -6 / - EH3ST - / -18 4 ✓ Closing fragment
09-18 18:53 40m +2 / -11 RA4ADF -10 / -20 4 ✓ Full exchange observed
09-18 18:50 40m - / -1 YO8DHA +7 / - 2 ✓ Closing fragment
09-18 18:44 80m +14 / - SQ8GBG +14 / -2 2 Partial capture
09-18 18:44 80m +12 / +4 YO3FRI +16 / - 3 ✓ Full exchange observed
09-18 18:42 80m +14 / - OM1AGE - / - 2 Partial capture
09-18 18:40 80m +12 / - DB100FT - / - 2 Partial capture
09-18 18:37 80m +12 / -20 I7DFV +8 / +9 7 ✓ Full exchange observed
09-18 18:36 80m +8 / +1 DL8TV +8 / -6 4 ✓ Full exchange observed
09-18 18:29 80m - / -14 UC6D -3 / - 3 Partial capture
09-18 18:28 80m +10 / -6 SP9WAZ +9 / -17 5 ✓ Full exchange observed
09-18 13:55 40m -8 / - DK8WQ/P - / - 8 Partial capture
09-18 13:47 40m -11 / - IZ5FSO -19 / - 2 ✓ Closing observed
09-18 09:34 40m -15 / - I0XNH - / - 2 Partial capture
09-18 09:29 40m - / -1 HA1ZW -10 / - 2 Partial capture
09-18 09:21 40m -14 / - TK5NJ - / -17 7 ✓ Closing fragment
09-18 09:15 40m -10 / - I8IGS - / -11 4 ✓ Closing fragment
09-18 09:11 40m -16 / - IU0KNS - / +1 2 ✓ Closing fragment
09-18 09:10 40m -16 / -4 S56LKP -16 / +4 5 ✓ Full exchange observed
09-18 09:04 40m -12 / -6 IU4RQY -22 / -5 4 ✓ Full exchange observed
09-18 09:03 40m -13 / +6 IZ5RKH -8 / +3 6 ✓ Full exchange observed
09-18 06:02 40m -9 / - IU0TYC -12 / - 2 ✓ Closing observed
09-18 05:51 40m -7 / - IW2IDB -18 / -16 3 Partial capture
09-18 05:49 40m -8 / -15 EU4U -1 / - 5 ✓ Closing observed
09-18 05:43 80m 0 / - ON3MOH - / -17 2 ✓ Closing fragment
09-18 05:41 80m +5 / - LA3LUA - / - 3 Partial capture
09-18 05:34 80m +4 / - SV1DKR - / +1 3 ✓ Closing fragment
09-18 05:31 80m +4 / - DO9YU - / - 4 Partial capture
09-17 21:47 40m - / -14 IW6OMM 0 / - 3 ✓ Closing fragment
09-17 21:27 60m - / - IK1BQD -10 / - 5 Partial capture
09-17 21:15 80m +2 / +6 OE6MNE -10 / -13 12 ✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
075330 -12 2251  SP9DPI YU7AS -20 (x12)
080330 -11 1999  CQ YU7AS KN05 (x3)
80m 
UTC    dB Audio  Message
033545 +14 1330  CQ YU7AS KN05 (x2)
033715 +16 1330  EA2DYB YU7AS RR73
033815 +17 1330  CQ YU7AS KN05
033830 +14  281  YU7AS EU7A KO53 (x2)
033930 +18 2095  HI8R YU7AS KN05
033945  -8 1431  YU7AS HI8R -19
034000 +19 2095  HI8R YU7AS R-15 (x2)
034100 +19 2451  CQ YU7AS KN05 (x5)
60m 
UTC    dB Audio  Message
144800  +4  610  YU7AS SP5JMA KO02
201300 -12 2501  YU7AS EA1KCN IN53
212400 -12  869  YU7AS IK1BQD JN35 (x6)
20m 
UTC    dB Audio  Message
113630 -23 1427  YU7AS PA3CDX 73
113630  -7  930  YU7AS IU8WRA JM89
114115  -8 2821  CQ YU7AS KN05
132530  +2 2525  YU7AS R6FMK LN05 (x3)
132700 -15 2177  YU7AS R3TS LO16 (x4)
133030  -8 2471  YU7AS DL6BCU R+17 (x2)
134500  -4 2420  YU7AS M3OCC JO02
134830  +1 2418  YU7AS RZ3Z/P KN84 (x2)
10m 
UTC    dB Audio  Message
093345  -4 2410  YU7AS ON5RZ R-07 (x2)
093715 -12 1737  YU7AS PE9JAN JO22 (x4)
113545 -24 1441  YU7AS DA6PI R-06
113615  +8  492  YU7AS IK4LZH JN54 (x4)
073030 -12 2734  YU7AS DM5UE JO52
115015  -3 2704  YU7AS EA3AKY JN01 (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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