YB5SD — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Indonesia Most frequent locator attributed to this token: OJ01

Receiver-side FT8 activity involving YB5SD, decoded by SO8OO in southeastern Poland. 132 FT8 messages attributed to this token as transmitter, on 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-08-31.

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 132 FT8 messages attributed to YB5SD as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (86%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

132
Messages attributed
13
UTC dates decoded
34
Active 15-min windows
-11 dB
Estimated median S/N

Bands

20m · 132
First attributed message: 2026-06-08
Last attributed message: 2026-08-31 20:00 UTC

Observed FT8 message patterns

Attributed sample
132 messages
Active dates
13 UTC dates
Estimated median S/N
-11 dB
Estimated 10th-90th percentile
-19 to -3 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 31, moderate (-15 to -9 dB) 71, strong (≥ -8 dB) 30.

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 YB5SD 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 YB5SD

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
OJ01 · 54 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
9,109 km (approx.)
Last such locator decoded
2026-08-31 20:00 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 UTCBandYB5SD S/NCounterpartCounterpart S/NMsgsCapture
08-31 20:07 20m - / - CT4KQ -7 / - 4 Partial capture
08-31 20:07 20m - / - F5IYE +16 / - 2 Partial capture
08-31 20:01 20m - / -14 PE1NGW -12 / - 2 Partial capture
08-31 19:59 20m -3 / - SM7OYP - / - 3 Partial capture
08-31 19:58 20m -7 / - PE1LYU - / -16 2 ✓ Closing fragment
08-31 14:47 20m - / - R7IW -8 / - 3 ✓ Closing fragment
08-31 13:57 20m - / -18 UD8S -13 / - 5 ✓ Closing fragment
08-31 13:25 20m - / - RL3T +2 / - 2 Partial capture
08-31 08:48 20m - / - HB9TIH -6 / - 7 Partial capture
08-31 08:42 20m - / - HB9TIH -5 / - 5 Partial capture
08-31 08:34 20m - / - HB9TIH -2 / - 4 Partial capture
08-31 08:29 20m - / - HB9TIH -12 / - 3 Partial capture
08-31 07:34 20m - / - HB9TIH -17 / - 2 Partial capture
08-29 21:27 20m - / - SV5BYP -3 / - 5 Partial capture
08-29 21:27 20m - / - UA6YW -12 / - 2 Partial capture
08-29 21:18 20m - / -10 9A4V -14 / - 2 ✓ Closing fragment
08-29 21:15 20m -12 / - EA6UE - / -17 2 Partial capture
08-29 21:12 20m 0 / -1 EA8Y -4 / -19 6 ✓ Full exchange observed
08-29 21:09 20m -12 / - OK1MXD - / - 3 Partial capture
08-29 20:57 20m -20 / - F4JVF - / -18 2 ✓ Closing fragment
08-29 20:54 20m - / - LZ2EW -10 / - 2 Partial capture
08-29 20:52 20m -22 / - 4Z1GY - / -20 4 ✓ Closing fragment
08-29 20:34 20m - / -6 LX7I -14 / - 2 ✓ Closing fragment
08-29 20:17 20m - / -12 EB5AL +2 / - 3 ✓ Closing fragment
08-28 15:42 20m - / -15 UB4CJS -10 / - 5 Partial capture
08-28 15:41 20m -11 / - OZ9FF - / -19 2 ✓ Closing fragment
08-28 15:27 20m -15 / -4 F4PCM 0 / -15 5 ✓ Full exchange observed
08-28 15:27 20m - / -15 R2ZCA -7 / - 4 Partial capture
08-28 15:23 20m - / - F4PCM +14 / - 2 Partial capture
08-28 15:19 20m -16 / - UA3ZMQ - / - 4 Partial capture
08-28 15:13 20m -17 / -13 4X5KL -6 / -22 4 ✓ Full exchange observed
08-28 15:09 20m - / - G7EVY +2 / - 5 Partial capture
08-28 13:18 20m - / -11 BD6IUT -16 / - 2 ✓ Closing fragment
08-28 13:05 20m - / -18 RU3QR +14 / - 11 Partial capture
08-27 19:48 20m - / - DL3MIB +2 / - 7 Partial capture
08-27 19:46 20m - / -21 PA3BV -17 / - 3 Partial capture
08-27 19:38 20m - / - F4ACR +8 / - 4 Partial capture
08-27 19:36 20m - / - TA2ETI -18 / - 2 Partial capture
08-27 19:32 20m - / - DL3MIB 0 / - 7 Partial capture
08-27 14:48 20m - / - TA4SSK -3 / - 2 Partial capture
08-27 14:47 20m - / - F4BYA +8 / - 4 Partial capture
08-27 14:47 20m - / - PD4WAC +6 / - 13 Partial capture
08-27 14:42 20m - / -20 PD1B -9 / - 3 Partial capture
08-27 14:42 20m - / - PD2PE -9 / - 5 Partial capture
08-27 14:40 40m - / -11 R2SL -2 / - 2 ✓ Closing fragment
08-27 14:35 20m -14 / - BA4SGR - / - 3 Partial capture
08-27 14:23 20m - / - SM0FVI/3 -1 / - 5 Partial capture
08-27 14:22 20m - / - PD1RHK -7 / - 5 Partial capture
08-27 11:37 20m - / -17 RA9J -1 / - 5 ✓ Closing fragment
08-27 09:56 20m - / - F1PSX -4 / - 5 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
144915  -9 1472  YB5SD R7IW 73
195700 -24 2717  RD6OB YB5SD RR73
195800  -8 2588  PE1LYU YB5SD R-16 (x2)
195930  -2 2840  SM7OYP YB5SD OJ01 (x3)
200145 -10 2020  YB5SD PE1NGW -14 (x2)
200715 +15 2297  YB5SD F5IYE JN05
200715  -6 2071  YB5SD CT4KQ IN60
200745 +16 2298  YB5SD F5IYE JN05
200815  -8 2071  YB5SD CT4KQ IN60 (x3)
40m 
UTC    dB Audio  Message
161230  -8 1284  YB5SD UT2VX KN69 (x4)
161400 -22 1905  YB5SD DK7ZT -10
161430 -13 1283  YB5SD UT2VX R-13
162030 -20 1431  YB5SD YO2LGK KN05 (x5)
163100 -16 2124  YB5SD R7DX KN84 (x2)
144000  -1 2337  YB5SD R2SL -11 (x2)
10m 
UTC    dB Audio  Message
143815  -9 2515  YB5SD IK6DLK JN63
103930  -7 1722  YB5SD 9A5EX JN75 (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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