YO4SLL — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: Romania Most frequent locator attributed to this token: KN45

Receiver-side FT8 activity involving YO4SLL, decoded by SO8OO in southeastern Poland. 56 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-13.

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 56 FT8 messages attributed to YO4SLL as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (55%), followed by 20 m (38%) and 10 m (7%). Several six-hour UTC windows tied for the largest share (79%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (77%); the estimated median was -1 dB.

Overview

56
Messages attributed
8
UTC dates decoded
10
Active 15-min windows
-1 dB
Estimated median S/N

Bands

40m · 31 20m · 21 10m · 4
First attributed message: 2026-06-08
Last attributed message: 2026-09-13 13:59 UTC

Observed FT8 message patterns

Attributed sample
56 messages
Active dates
8 UTC dates
Estimated median S/N
-1 dB
Estimated 10th-90th percentile
-15 to +7 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 10, strong (≥ -8 dB) 43.

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 YO4SLL 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 YO4SLL

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
KN45 · 38 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
730 km (approx.)
Last such locator decoded
2026-09-13 13:58 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 UTCBandYO4SLL S/NCounterpartCounterpart S/NMsgsCapture
09-21 00:00 40m - / -21 R4HHN -12 / - 4 ✓ Closing fragment
09-20 23:57 40m - / -9 KC1OXG -4 / - 2 Partial capture
09-13 13:57 40m +2 / -13 EX7CQ -22 / -5 6 ✓ Full exchange observed
09-04 16:26 40m +6 / - RI1FJL - / - 5 Partial capture
09-04 16:19 40m +1 / - RI1FJL - / - 6 Partial capture
09-04 16:14 40m -1 / - RI1FJL - / - 4 Partial capture
09-04 16:08 40m +9 / - RI1FJL - / -26 3 Partial capture
09-04 15:55 40m +5 / - RI1FJL - / -20 9 Partial capture
08-31 23:29 40m - / -7 OK1WCF -17 / - 3 ✓ Closing fragment
08-31 23:29 40m - / - UW5IM -8 / - 8 Partial capture
08-31 23:17 40m - / +5 PD0IFI -7 / - 2 ✓ Closing fragment
08-31 23:07 40m - / -8 S51CC -14 / - 2 ✓ Closing fragment
08-31 23:06 40m - / -10 F1PBZ -4 / - 3 Partial capture
08-30 13:31 20m - / -3 RI1FJL +1 / - 3 ✓ Closing fragment
08-30 04:53 20m - / -12 RW4HBD -4 / - 5 ✓ Closing fragment
08-30 04:53 20m - / -6 UG4P -12 / - 2 ✓ Closing fragment
08-25 05:03 20m - / -10 AK8A +5 / - 2 ✓ Closing fragment
08-25 04:53 20m - / -12 XQ1KK -6 / - 2 ✓ Closing fragment
08-25 04:19 20m - / +2 RV6F -9 / - 3 ✓ Closing fragment
08-20 16:06 20m -15 / -12 BU2FW -24 / -14 3 Partial capture
08-11 16:00 20m -8 / - BI4JJO - / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
162715  +5  871  RI1FJL YO4SLL KN45 (x3)
135745  +1  905  EX7CQ YO4SLL KN45 (x2)
135830 -21 1715  YO4SLL EX7CQ -13
135845  +0  905  EX7CQ YO4SLL R-05
135900 -22 1714  YO4SLL EX7CQ RR73
135915  +5  905  EX7CQ YO4SLL 73
235715  -4  922  YO4SLL KC1OXG -09 (x2)
000015 -14  958  YO4SLL R4HHN LO43 (x4)
20m 
UTC    dB Audio  Message
045330  -7 1880  YO4SLL XQ1KK -12 (x2)
050315  +6 2747  YO4SLL AK8A -10 (x2)
045315 -11 2368  YO4SLL UG4P -06
045315  -9 2019  YO4SLL RW4HBD LO53
045345 -13 2368  YO4SLL UG4P RR73
045345  -3 2018  YO4SLL RW4HBD LO53 (x4)
133130  +0  421  YO4SLL RI1FJL -03 (x3)
133400  +0  480  YO4SLL RR73; SP3QDE <...> -08
10m 
UTC    dB Audio  Message
133630  -2 2638  YO4SLL F1PBZ +01

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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