S55JU — 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: Slovenia Most frequent locator attributed to this token: JN75

Receiver-side FT8 activity involving S55JU, decoded by SO8OO in southeastern Poland. 49 FT8 messages attributed to this token as transmitter, on 80m, 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-10-13.

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 49 FT8 messages attributed to S55JU 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 (76%), followed by 80 m (24%). Several six-hour UTC windows tied for the largest share (73%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

49
Messages attributed
13
UTC dates decoded
18
Active 15-min windows
-12 dB
Estimated median S/N

Bands

80m · 12 20m · 37
First attributed message: 2026-06-13
Last attributed message: 2026-10-13 18:11 UTC

Observed FT8 message patterns

Attributed sample
49 messages
Active dates
13 UTC dates
Estimated median S/N
-12 dB
Estimated 10th-90th percentile
-20 to -6 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 15, moderate (-15 to -9 dB) 21, strong (≥ -8 dB) 13.

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 S55JU 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 S55JU

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
JN75 · 38 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
708 km (approx.)
Last such locator decoded
2026-10-13 18:11 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 UTCBandS55JU S/NCounterpartCounterpart S/NMsgsCapture
10-13 18:11 80m - / - DB9LG +3 / - 10 Partial capture
10-03 17:56 60m - / -15 DK5SF +1 / - 3 Partial capture
10-03 17:55 60m - / -16 9A4ZM +10 / - 3 Partial capture
09-26 06:45 40m - / - DL6UM +2 / - 3 Partial capture
09-21 18:04 60m - / - DD6ZV +5 / - 7 Partial capture
09-21 18:02 60m - / -20 F1PBZ -9 / - 2 ✓ Closing fragment
09-20 17:44 80m - / -19 9A3TGY -7 / - 2 ✓ Closing fragment
09-20 17:41 80m -22 / - IQ4JO -9 / -4 3 ✓ Closing observed
08-30 07:19 20m - / - F1PPH -6 / - 10 Partial capture
08-30 07:10 40m - / -14 F1PBZ -9 / - 2 Partial capture
08-30 07:10 40m - / - PC2J -5 / - 2 Partial capture
08-30 07:08 40m - / -3 DF8RU +10 / - 3 ✓ Closing fragment
08-29 07:52 20m -11 / - SP3QDU - / -10 2 ✓ Closing fragment
08-12 07:53 20m -12 / -24 DK5OPA -7 / -9 3 Partial capture
08-12 07:34 20m -14 / - SQ8AA - / - 2 ✓ Closing fragment
08-11 14:49 20m - / - DF7EE -11 / - 2 ✓ Closing fragment
08-11 07:59 20m - / - DK5OPA -10 / - 2 Partial capture
08-11 07:40 20m -18 / - R3NBL - / - 2 Partial capture
08-10 07:50 20m - / -6 F5SJC -12 / - 2 Partial capture
08-10 07:33 20m -21 / -10 DK3HV -8 / - 3 ✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
171030 -15 2789  CQ CQ S55JU JN75 (x2)
171215  +5 2914  S55JU OZ1HPS JO45
181100 -17  745  CQ CQ S55JU JN75
181115  +7  359  S55JU DB9LG JO40
181130 -20  745  CQ CQ S55JU JN75
181145  +2  359  S55JU DB9LG JO40 (x9)
60m 
UTC    dB Audio  Message
180445  +5 2433  S55JU DD6ZV JO62 (x7)
170415  -7 1780  S55JU IK3/UY7LA R-12
170845 -19 1637  S55JU F4HSB JN37
175515  +8  780  S55JU 9A4ZM JN86 (x2)
175615  +0  969  S55JU DK5SF JN48
175615 +10  780  S55JU 9A4ZM R-16
175745  -1  969  S55JU DK5SF -15 (x2)
40m 
UTC    dB Audio  Message
070845 +12 2386  S55JU DF8RU JN68 (x3)
071015  -4 2387  S55JU PC2J JO22
071015 -10 2785  S55JU F1PBZ -14
071045  -6 2387  S55JU PC2J JO22
071145  -8 2785  S55JU F1PBZ -14
064545  +2  587  S55JU DL6UM JO60 (x3)
20m 
UTC    dB Audio  Message
075430  -6 2386  CQ CQ S55JU JN75 (x5)
071945  -7 1771  S55JU F1PPH JN07 (x10)
10m 
UTC    dB Audio  Message
074330  -7 1255  S55JU LZ2VQ 73
074715 -15  890  S55JU UR1CCT R-12

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

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee