UD4Y — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: LO36

Receiver-side FT8 activity involving UD4Y, decoded by SO8OO in southeastern Poland. 51 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 14 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-09-04.

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 51 FT8 messages attributed to UD4Y as the transmitting token by decoded message structure across 14 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (80%), followed by 20 m (20%). Most decodes (98%) 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 -16 dB.

Overview

51
Messages attributed
14
UTC dates decoded
20
Active 15-min windows
-16 dB
Estimated median S/N

Bands

40m · 41 20m · 10
First attributed message: 2026-06-13
Last attributed message: 2026-09-04 18:50 UTC

Observed FT8 message patterns

Attributed sample
51 messages
Active dates
14 UTC dates
Estimated median S/N
-16 dB
Estimated 10th-90th percentile
-19 to -10 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 26, moderate (-15 to -9 dB) 23, strong (≥ -8 dB) 2.

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 UD4Y 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 UD4Y

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
LO36 · 24 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,817 km (approx.)
Last such locator decoded
2026-09-04 18:46 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 UTCBandUD4Y S/NCounterpartCounterpart S/NMsgsCapture
09-04 18:48 40m -12 / - R1BDX - / -15 2 ✓ Closing fragment
09-04 18:36 40m - / - R6DZR +2 / - 2 Partial capture
09-04 18:29 40m - / - DL1EDR +3 / - 3 Partial capture
08-14 16:15 20m -9 / - LA2GCA - / -1 2 Partial capture
08-07 21:45 40m - / - PE1NPS -13 / - 3 Partial capture
08-07 21:40 40m - / 0 R2EN -18 / - 4 ✓ Closing fragment
08-06 19:27 40m - / - SM7JKW -15 / - 3 Partial capture
08-06 19:25 40m - / -19 DK7UY -21 / - 3 Partial capture
08-06 19:22 40m - / -11 DH2YBG -16 / - 2 Partial capture
08-06 19:22 40m - / - DL7ARV -5 / - 6 Partial capture
08-06 19:19 20m -12 / - DL1SUZ - / -12 2 Partial capture
08-06 19:16 20m -12 / -12 JA0LFV -16 / +6 4 ✓ Full exchange observed
08-04 19:29 20m - / -17 EC3A -12 / - 2 Partial capture
08-04 19:23 20m - / -10 RZ6CO -11 / - 4 ✓ Closing fragment
08-03 18:04 40m - / - EW8DU -18 / - 2 ✓ Closing fragment
08-03 16:55 40m - / -2 DL6UM -7 / - 7 ✓ Closing fragment
08-03 12:02 20m - / -4 F1ODM -16 / - 2 ✓ Closing fragment
08-03 12:02 20m - / - IK4LZH +7 / - 4 Partial capture
08-03 11:31 20m - / -20 YO6LM -9 / - 3 Partial capture
08-03 10:42 20m - / -22 PD3LKN -16 / - 9 Partial capture
08-01 20:27 40m -14 / -4 R3TIT -15 / - 3 ✓ Closing observed
08-01 20:24 40m - / - DL6UM -9 / - 2 Partial capture
07-31 19:52 40m - / +1 DL6UM -15 / - 5 Partial capture
07-31 19:27 160m - / -20 UA3ZUX -15 / - 3 ✓ Closing fragment
07-31 19:23 80m - / -18 R3EDX +14 / - 5 ✓ Closing fragment
07-28 15:49 40m - / -8 YO9HP -4 / - 2 ✓ Closing fragment
07-26 20:29 40m -17 / -2 RA6ABO -16 / -12 4 ✓ Full exchange observed
07-25 20:15 40m - / - RK3AQ -8 / - 2 Partial capture
07-23 10:31 10m - / - RW6HP -21 / - 2 Partial capture
07-22 17:01 40m - / - R3WDW +1 / - 2 Partial capture
07-21 20:46 40m - / - SP7CAC -10 / - 6 Partial capture
07-21 20:42 40m - / -5 UA4FKT -7 / - 3 ✓ Closing fragment
07-21 20:40 40m - / - EA1B -9 / - 2 Partial capture
07-19 19:20 40m - / - R6OIW -11 / - 3 ✓ Closing fragment
07-19 19:09 40m - / - SQ3PMX -1 / - 4 Partial capture
07-19 19:01 40m - / -6 R9FE -16 / - 2 ✓ Closing fragment
07-18 20:58 40m - / - DL6UM -12 / - 3 Partial capture
07-18 20:57 40m - / - UB6OCP -20 / - 5 Partial capture
07-18 20:52 40m - / - DL6UM -12 / - 2 Partial capture
07-18 20:52 40m - / -15 DL3MIB -4 / - 8 ✓ Closing fragment
07-18 20:51 40m - / - LA2GCA -19 / - 6 Partial capture
07-11 19:28 40m - / -7 RA3WY -13 / - 3 ✓ Closing fragment
07-11 19:27 40m - / - IK4LZH -3 / - 3 Partial capture
07-11 19:20 40m - / -6 RO3ZR -17 / - 2 Partial capture
07-11 19:19 40m - / -4 R3XBS -14 / - 2 ✓ Closing fragment
07-11 19:15 40m - / -14 RA3TVW -13 / - 4 Partial capture
07-10 20:53 40m - / - UB3YGA -4 / - 4 ✓ Closing fragment
07-10 20:51 40m -19 / -9 DL7ACA -9 / -10 7 Partial capture
07-09 21:54 40m - / -19 ON7KEI -22 / - 2 Partial capture
07-09 21:50 40m -12 / -2 DL3RL +5 / +7 7 ✓ 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
214730 -14 2535  UD4Y PE1NPS JO22
214830 -19 1193  DP6K/P UD4Y LO36
180645  -8 1193  UD4Y IK1MJK JN35
182915  +3 1046  UD4Y DL1EDR JO41 (x3)
183045  -7 1045  UD4Y F1IQH JN27
183115  +4 2045  UD4Y DL6ZOG JO52
183515  -7 1046  EX7CQ UD4Y LO36
183600  +2  739  UD4Y R6DZR KN84 (x2)
184415  -9 1045  EX7CQ UD4Y LO36 (x2)
184845 -10 1045  R1BDX UD4Y -15 (x2)
20m 
UTC    dB Audio  Message
192445  -9 2177  UD4Y RZ6CO -10 (x2)
192915 -12 1747  UD4Y EC3A -17 (x2)
191645 -16 1825  UD4Y JA0LFV -12
191730 -11 2036  JA0LFV UD4Y R+06 (x3)
191900 -11 2035  DL1SUZ UD4Y -12 (x2)
161415 -15  999  CQ UD4Y LO36
161515 -10  999  LA2GCA UD4Y -01 (x2)
161645 -11  998  SP1ZMO UD4Y -07
162115  -9  995  SP6FME UD4Y RR73
160m 
UTC    dB Audio  Message
192715 -16 1856  UD4Y UA3ZUX KO90 (x3)
80m 
UTC    dB Audio  Message
192330 +11  797  UD4Y R3EDX -18 (x5)
10m 
UTC    dB Audio  Message
103100 -24 1602  UD4Y RW6HP LN14 (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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