HL5YI — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Republic of Korea Most frequent locator attributed to this token: PM45

Receiver-side FT8 activity involving HL5YI, decoded by SO8OO in southeastern Poland. 46 FT8 messages attributed to this token as transmitter, on 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-07-12.

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 46 FT8 messages attributed to HL5YI as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's moderate S/N range (63%); the estimated median was -14 dB.

Overview

46
Messages attributed
4
UTC dates decoded
8
Active 15-min windows
-14 dB
Estimated median S/N

Bands

20m · 46
First attributed message: 2026-06-09
Last attributed message: 2026-07-12 18:02 UTC

Observed FT8 message patterns

Attributed sample
46 messages
Active dates
4 UTC dates
Estimated median S/N
-14 dB
Estimated 10th-90th percentile
-17 to -10 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 29, strong (≥ -8 dB) 0.

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 HL5YI in decoded directed-looking exchanges:

Most frequent locator attributed to HL5YI

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
PM45 · 14 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,137 km (approx.)
Last such locator decoded
2026-06-11 21:07 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 UTCBandHL5YI S/NCounterpartCounterpart S/NMsgsCapture
08-24 21:08 20m - / +1 DM2DXA -4 / - 2 ✓ Closing fragment
08-24 21:02 20m - / -18 E77FN -4 / - 3 ✓ Closing fragment
08-24 21:00 20m - / -12 EA4PS -2 / - 3 ✓ Closing fragment
08-24 20:58 20m - / -2 EA4IAH -14 / - 2 Partial capture
08-24 20:54 20m - / - EA4IAH -12 / - 2 Partial capture
08-24 20:53 20m - / -17 CT7AUT -16 / - 3 ✓ Closing fragment
08-24 20:41 20m - / -15 EA1AOC +5 / - 9 ✓ Closing fragment
08-21 23:29 20m - / - SV5BYP -8 / - 2 Partial capture
08-21 20:19 20m - / -13 4Z5PT -4 / - 2 ✓ Closing fragment
08-20 21:25 20m - / -9 EB1DJ -2 / - 3 ✓ Closing fragment
08-20 21:10 40m - / -12 SP5ES +16 / - 3 ✓ Closing fragment
08-19 18:51 20m - / -17 EA5WD +10 / - 7 Partial capture
08-19 18:44 20m - / - F4LZZ -5 / - 3 ✓ Closing fragment
08-19 18:42 20m - / -12 F4HSR +10 / - 3 ✓ Closing fragment
08-19 18:28 20m - / -22 IZ4JMA -17 / - 3 ✓ Closing fragment
08-19 18:26 20m - / -18 EA5IXH -8 / - 2 ✓ Closing fragment
08-07 21:54 20m - / -12 M8KUG -8 / - 2 Partial capture
08-07 21:52 20m - / -19 M9KJY -6 / - 2 ✓ Closing fragment
08-07 21:49 20m - / -12 GM3AND -7 / - 2 Partial capture
08-07 21:40 20m - / -7 DH2RL -5 / - 2 ✓ Closing fragment
07-23 05:08 20m - / -20 EA3NG -2 / - 2 ✓ Closing fragment
07-20 22:17 20m - / -14 CR7BRV -6 / - 2 ✓ Closing fragment
07-12 18:10 20m - / - EA5IT -4 / - 4 Partial capture
07-12 18:03 20m - / -17 9A3K -5 / - 2 Partial capture
07-12 17:57 20m - / - IT9BCC -6 / - 2 Partial capture
07-12 17:56 20m - / - RG7O +2 / - 3 Partial capture
07-12 17:54 20m -16 / -5 UT4LU +6 / - 4 ✓ Closing observed
07-12 17:51 20m - / - RG7O -3 / - 3 Partial capture
07-12 17:51 20m - / -13 YO8RC +6 / - 7 ✓ Closing fragment
07-12 17:48 20m - / -20 EA3AAY -17 / - 2 Partial capture
07-12 17:45 20m - / - F4MUD -14 / - 3 Partial capture
07-05 19:12 20m - / -12 UB3KDU -10 / - 2 ✓ Closing fragment
07-05 19:10 20m - / -8 LZ2PC -17 / - 2 ✓ Closing fragment
07-05 18:50 20m - / -15 EA5GDY -8 / - 3 ✓ Closing fragment
07-05 18:42 20m - / -11 UA6LCF +6 / - 3 ✓ Closing fragment
07-05 18:27 20m - / -12 GB2WWA +5 / - 3 Partial capture
07-03 21:38 20m - / -15 CE3PA -16 / - 2 Partial capture
07-03 21:20 20m - / -15 UF4S -22 / - 2 ✓ Closing fragment
06-29 20:36 20m - / -11 ON6AA +8 / - 3 ✓ Closing fragment
06-29 19:29 20m - / -17 M0PTZ 0 / - 2 Partial capture
06-29 19:19 20m - / -25 EA3KY -13 / - 10 ✓ Closing fragment
06-24 21:14 20m - / - IU4RWW -4 / - 3 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
205415 -19 2012  HL5YI OS4K -18
205415 -14  895  HL5YI EA4IAH IN80
205415 -11 1539  HL5YI CT7AUT 73
205445 -11  894  HL5YI EA4IAH IN80
205645 -16 2380  HL5YI M0LAD JO02
205815 -10  894  HL5YI EA4IAH IN80 (x2)
210045  +0 2377  HL5YI EA4PS IN80 (x3)
210215  -4 1432  HL5YI E77FN JN93 (x3)
210815  -1 2080  HL5YI DM2DXA +01 (x2)
40m 
UTC    dB Audio  Message
211000 +17  563  HL5YI SP5ES -12 (x3)

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