YU5DR — FT8 activity observed at SO8OO

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

Receiver-side FT8 activity involving YU5DR, decoded by SO8OO in southeastern Poland. 1,615 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 53 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-10-04.

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 1,615 FT8 messages attributed to YU5DR as the transmitting token by decoded message structure across 53 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (41%), followed by 20 m (40%) and 40 m (14%). Most decodes (53%) 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

1,615
Messages attributed
53
UTC dates decoded
188
Active 15-min windows
-6 dB
Estimated median S/N

Bands

80m · 660 40m · 227 20m · 650 10m · 78
First attributed message: 2026-06-07
Last attributed message: 2026-10-04 20:20 UTC

Observed FT8 message patterns

Attributed sample
1,615 messages
Active dates
53 UTC dates
Estimated median S/N
-6 dB
Estimated 10th-90th percentile
-19 to +6 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 334, moderate (-15 to -9 dB) 369, strong (≥ -8 dB) 912.

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 YU5DR 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 YU5DR

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 · 957 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
608 km (approx.)
Last such locator decoded
2026-10-04 20:19 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 UTCBandYU5DR S/NCounterpartCounterpart S/NMsgsCapture
10-04 20:19 40m +2 / -14 UR4LJ -2 / -10 5 ✓ Full exchange observed
10-04 20:16 40m -6 / - F6FDY +6 / -7 5 ✓ Closing observed
10-04 20:15 40m -2 / - M0IOY - / -7 2 ✓ Closing fragment
10-04 20:10 40m +1 / -10 RD3FY -1 / -15 10 ✓ Full exchange observed
10-04 20:08 80m - / - DL7UKM +10 / - 2 Partial capture
10-04 20:01 80m -6 / - EB1LA -6 / -20 10 Partial capture
10-04 19:56 80m -9 / - DO2MWS - / 0 5 Partial capture
10-04 19:52 80m - / - G4RWD -1 / - 2 Partial capture
10-04 19:51 80m +4 / -2 YO5OUC +4 / - 4 ✓ Closing observed
10-04 19:47 80m - / -8 DM3ER +8 / - 2 ✓ Closing fragment
10-04 19:45 80m - / -17 R4HLO -20 / - 2 Partial capture
10-04 19:39 80m -2 / -12 T77R 0 / -11 4 ✓ Full exchange observed
10-04 19:31 80m -2 / - DL7UKM -1 / -14 6 Partial capture
10-04 19:30 80m -2 / -1 LY1DY +12 / -5 4 ✓ Full exchange observed
10-04 19:24 80m -10 / - PA0MUS +3 / -21 4 Partial capture
10-04 19:24 80m -10 / - R5ZQ - / -5 2 Partial capture
10-04 19:22 80m -1 / -9 R3PLN -4 / - 3 ✓ Closing observed
09-25 20:44 80m - / - DF4WC -3 / - 3 Partial capture
09-25 20:43 80m - / -1 G0ORC -16 / - 2 Partial capture
09-25 20:40 80m -4 / -5 DK9PH +4 / -11 4 ✓ Full exchange observed
09-25 20:35 80m -1 / - ON5MX -12 / -16 6 ✓ Closing observed
09-25 20:34 80m -3 / - DA6BR - / -17 3 ✓ Closing fragment
09-25 20:30 80m -1 / -12 DO5PY -11 / -18 7 ✓ Full exchange observed
09-25 20:29 80m -6 / -2 DB2HA +2 / -12 5 ✓ Full exchange observed
09-25 20:24 40m - / -13 DJ3IV -11 / - 3 ✓ Closing fragment
09-25 08:09 10m - / -10 RA9ACA -2 / - 2 ✓ Closing fragment
09-23 18:54 80m -4 / -17 RC2Y -2 / -15 3 ✓ Full exchange observed
09-23 18:53 80m -2 / -9 RA2FU -5 / -18 5 ✓ Full exchange observed
09-23 18:51 80m +2 / -17 RA1TR -8 / - 3 ✓ Closing observed
09-23 18:47 80m -5 / -8 G6CUT -6 / -11 6 ✓ Full exchange observed
09-23 18:42 80m -3 / - R7FG - / - 8 Partial capture
09-23 18:14 80m -10 / -21 RA5AD -2 / -11 5 ✓ Full exchange observed
09-22 18:20 40m -17 / -19 R2HE -9 / -21 7 ✓ Full exchange observed
09-18 19:31 80m -8 / - EU1AFX - / -18 2 ✓ Closing fragment
09-18 19:26 80m - / -3 SO100PKP -2 / - 2 Partial capture
09-18 19:26 80m -1 / - R2AZK/1 - / -16 3 Partial capture
09-18 19:21 80m -1 / 0 DL3RL +13 / - 4 ✓ Closing observed
09-06 21:14 40m -9 / -16 EX7CQ -2 / - 2 ✓ Closing observed
09-04 20:38 40m +3 / -17 R6OK -14 / - 4 Partial capture
09-04 20:36 40m - / - RL3K -2 / - 3 Partial capture
09-04 20:33 40m -2 / -4 9A2AA -10 / -2 4 ✓ Full exchange observed
09-04 20:33 40m -5 / -11 YT1DDL -8 / - 3 ✓ Closing observed
09-04 20:31 40m - / -17 UA3ADE +10 / - 2 ✓ Closing fragment
09-04 20:28 40m -4 / -15 EU3LA -3 / - 4 Partial capture
09-04 20:25 80m -5 / - DK5AN/P - / 0 2 Partial capture
09-04 20:24 80m -2 / -7 UW5KW +8 / -10 5 ✓ Full exchange observed
09-04 20:20 80m -1 / -11 R3YAU -7 / -16 7 ✓ Full exchange observed
09-04 20:12 80m +2 / -14 SP9JZT +24 / +7 5 ✓ Full exchange observed
09-03 16:53 80m -3 / - RN7T - / - 2 Partial capture
09-03 06:21 40m - / - DL6LG -7 / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
201600  +0 2526  M0IOY YU5DR RR73
201630  -3 2526  CQ YU5DR KN04
201645  +9 2877  YU5DR F6FDY JN33 (x2)
201730  -7 2533  F6FHZ YU5DR RR73
201745  +3 2877  YU5DR F6FDY JN33
201800  -6 2381  F6FDY YU5DR -07
201845  +2 2877  YU5DR F6FDY 73
201900  -2 2381  CQ YU5DR KN04 (x2)
201945  -3 2380  YU5DR UR4LJ KO80
202000  +4 2384  UR4LJ YU5DR -10
202015  +0 2383  YU5DR UR4LJ R-14
202030  -1 2884  UR4LJ YU5DR RR73
202045  -4 2383  YU5DR UR4LJ R-14
80m 
UTC    dB Audio  Message
200245  -4  534  YU5DR EB1LA IN73
200300  -2 1539  EB1LA YU5DR -21 (x3)
200430  -2 1539  CQ YU5DR KN04 (x2)
200515  -6 2316  YU5DR G4RWD IO92
200530  -6 1539  CQ YU5DR KN04 (x5)
200815  -5 1736  YU5DR IU4QQE JN64
200845 +10 1539  YU5DR DL7UKM JO62 (x2)
10m 
UTC    dB Audio  Message
060000  -3 1601  YU5DR PD2V JO22 (x3)
062330 -18 1987  YU5DR US5EAA KN78 (x3)
103630 -11 1782  YU5DR DO5STL JO31
103700 -10  775  YU5DR DN9DKN R-12 (x2)
112230 -12 2025  YU5DR DO5STL JO31 (x3)
080945  -4 1255  YU5DR RA9ACA -10 (x2)
084500 -24 1703  YU5DR EX7CQ +01
20m 
UTC    dB Audio  Message
071230  +2 1885  YU5DR 2W0YOX R+10
071245  +0 1884  2W0YOX YU5DR RR73
071300  -4 1885  YU5DR 2W0YOX 73
071545  +0 1884  CQ YU5DR KN04 (x6)
071845  +3 1883  DC2SF YU5DR -03
071900  -6 2994  YU5DR IW5ALZ JN53
071915  +9 1883  DC2SF YU5DR RR73
072000  -4 2993  YU5DR IW5ALZ JN53
072715  +0 1883  CQ YU5DR KN04 (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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