YF4SDN — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Indonesia Locator transmitted in a decoded message: OI24

Receiver-side FT8 activity involving YF4SDN, decoded by SO8OO in southeastern Poland. 126 related FT8 messages, 14 CQ messages, observed on 20m, 10m, across 15 UTC dates. Heard between 2026-05-25 and 2026-08-23.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

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Overview

126
Related messages
14
CQ messages
15
UTC dates heard
-9 dB
Mean decoder S/N

Bands

20m 10m
First seen: 2026-05-25
Last seen: 2026-08-23 22:48 UTC

Frequent QSO partners observed at SO8OO

Stations YF4SDN worked most often, as logged from our receiver:

Activity Heatmap

Locator transmitted by YF4SDN

Approximate centre of OI24, decoded 2026-08-24 01:05 UTC. A transmitted locator is not proof of the operator's permanent location.

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 UTCBandYF4SDN S/NCounterpartCounterpart S/NMsgsCapture
08-24 01:00 20m -24 / - D2UY - / - 9 Partial capture
08-24 00:51 20m -24 / - D2UY - / - 4 Partial capture
08-24 00:48 20m - / -4 TJ1GD -9 / - 2 ✓ Closing fragment
08-01 15:24 20m - / - DH2YBG -16 / - 2 Partial capture
08-01 15:23 20m - / - DK9ZQ -14 / - 2 Partial capture
08-01 15:08 20m - / - DL6EL -14 / - 4 Partial capture
08-01 14:58 20m - / -11 UB4CJS -20 / - 7 Partial capture
07-28 15:13 20m - / -24 IZ8EYN -9 / - 5 Partial capture
07-28 14:15 20m - / -14 R4FDW -19 / - 7 Partial capture
07-12 15:39 20m - / -13 YH9GB -19 / - 2 ✓ Closing fragment
07-07 14:59 20m - / - F5RRS -3 / - 5 Partial capture
07-07 14:01 20m - / - LZ2VQ -13 / - 2 Partial capture
06-29 15:21 10m - / -17 TM2WWA +12 / - 2 Partial capture
06-17 14:54 20m -15 / - W7C - / - 2 Partial capture
06-17 14:54 20m - / - RZ4FWA -6 / - 2 Partial capture
06-16 15:14 20m - / - ON4TUK -6 / - 2 Partial capture
06-16 15:11 20m - / - PD5FM -14 / - 2 Partial capture
06-16 14:32 20m -14 / - W6C - / - 2 Partial capture
06-16 00:09 20m -12 / - 7X5CY - / - 6 Partial capture
06-15 15:58 20m - / - SH0EPN -18 / - 6 Partial capture
06-15 15:58 20m - / -10 R3BDQ -6 / - 3 Partial capture
06-15 15:57 20m -9 / - WT8P - / - 2 ✓ Closing fragment
06-15 15:54 20m - / - DK1MAX +13 / - 3 Partial capture
06-15 15:38 20m -11 / - W7ZR - / - 5 Partial capture
06-15 15:34 20m - / -8 SV4ZQ -12 / - 6 Partial capture
06-15 15:31 20m - / - F4NLM -2 / - 3 Partial capture
06-15 15:27 20m - / -21 R7OQ -15 / - 5 Partial capture
06-15 15:26 20m -10 / - PD4WAC +4 / -18 3 ✓ Closing observed
06-15 15:26 20m -13 / -8 SV4ZQ -6 / - 4 ✓ Closing observed
06-15 15:24 20m - / - SQ2FRF -7 / - 3 Partial capture
06-15 15:21 20m -12 / - PD7JLP +2 / -15 4 ✓ Closing observed
06-15 15:19 20m -14 / - W7ZR - / - 3 Partial capture
06-15 14:53 20m - / - RV9WJP -6 / - 3 Partial capture
06-15 14:43 20m - / - F5RRS +6 / - 3 Partial capture
06-15 14:29 20m - / -5 RL2Y +3 / - 2 Partial capture
06-01 15:31 20m -12 / - AE6CH - / - 2 Partial capture
06-01 15:25 20m -15 / -3 IS0LBE -9 / - 8 ✓ Closing observed
06-01 15:21 20m -16 / - W7MWR - / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
004830  -9  709  YF4SDN TJ1GD RR73
005045 -24 1660  TL8GD YF4SDN R-10
005145 -23 1659  D2UY YF4SDN OI24 (x13)
10m 
UTC    dB Audio  Message
110430  -8  377  YF4SDN E2WWA RR73
152115 +13 2762  YF4SDN TM2WWA -17 (x2)

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.