DF9SJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JN48

Receiver-side FT8 activity involving DF9SJ, decoded by SO8OO in southeastern Poland. 45 FT8 messages attributed to this token as transmitter, on 10m, across 2 UTC dates in the available aggregate history. Observed between 2026-07-05 and 2026-07-06.

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 45 FT8 messages attributed to DF9SJ as the transmitting token by decoded message structure across 2 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (100%). In this small sample, the estimated median decoder S/N was -16 dB; no usual signal pattern is inferred.

Overview

45
Messages attributed
2
UTC dates decoded
7
Active 15-min windows
-16 dB
Estimated median S/N

Bands

10m · 45
First attributed message: 2026-07-05
Last attributed message: 2026-07-06 18:46 UTC

Observed FT8 message patterns

Attributed sample
45 messages
Active dates
2 UTC dates
Estimated median S/N
-16 dB
Estimated 10th-90th percentile
-24 to -11 dB
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 27, moderate (-15 to -9 dB) 16, strong (≥ -8 dB) 2.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with DF9SJ in decoded directed-looking exchanges:

Most frequent locator attributed to DF9SJ

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
JN48 · 21 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
941 km (approx.)
Last such locator decoded
2026-07-06 18:46 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 UTCBandDF9SJ S/NCounterpartCounterpart S/NMsgsCapture
08-07 18:28 20m - / -12 F1SZC -1 / - 2 ✓ Closing fragment
08-07 18:18 20m - / - EA2EED -12 / - 2 Partial capture
08-07 18:14 20m - / -6 UN7LEW -12 / - 2 ✓ Closing fragment
08-07 18:13 20m - / -9 JE1FQV -7 / - 2 ✓ Closing fragment
08-07 17:48 20m - / -2 SV5BYP -8 / - 2 ✓ Closing fragment
08-07 17:08 20m - / -13 RZ4FWA -13 / - 3 Partial capture
08-07 16:40 20m - / - IW2DNI -1 / - 5 Partial capture
07-06 16:24 10m -20 / - PE1NPS - / - 2 ✓ Closing fragment
07-06 16:12 10m - / -7 ON4DS -18 / - 2 ✓ Closing fragment
07-05 18:51 10m -17 / - SV2MJY - / +3 2 Partial capture
07-05 18:46 10m -16 / - EA1GTX - / +3 3 Partial capture
07-05 18:44 10m -16 / - HA9GKL - / - 2 ✓ Closing fragment
07-05 18:43 10m -24 / - SP2MS - / - 2 ✓ Closing fragment
07-05 18:41 10m -18 / - LZ3AN - / +2 2 Partial capture
07-05 18:39 10m -14 / - CS2WWA - / - 2 ✓ Closing fragment
07-05 18:36 10m -19 / - LY1SR - / - 3 ✓ Closing fragment
07-05 18:31 10m -18 / - SX0W - / +2 2 ✓ Closing fragment
07-05 18:27 10m -18 / - SX0W - / - 3 Partial capture
07-05 18:25 10m -6 / - <...> - / -11 2 Partial capture
07-05 18:24 10m -12 / - OZ1HMJ - / -5 2 ✓ Closing fragment
07-05 18:18 10m -18 / - II9WWA - / -9 4 ✓ Closing fragment
07-05 18:13 10m -15 / - D2UY - / -9 3 ✓ Closing fragment
07-05 18:09 10m -12 / - II9WWA - / - 2 Partial capture
07-05 15:09 10m - / +10 F4VVJ -21 / - 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
165730 -21 2126  DF9SJ DK7XD JO43
170430 -24 2125  DF9SJ PD0PWH R+15
170830 -14 2030  DF9SJ RZ4FWA LO23 (x3)
174815 -10 1653  DF9SJ SV5BYP -02 (x2)
181300  -7  379  DF9SJ JE1FQV -09 (x2)
181430 -10 1126  DF9SJ UN7LEW -06 (x2)
181800 -12  877  DF9SJ EA2EED +13 (x2)
182845  -2 1177  DF9SJ F1SZC -12 (x2)
10m 
UTC    dB Audio  Message
184445 -20 1630  HA9GKL DF9SJ JN48 (x2)
184645 -14 1630  EA1GTX DF9SJ JN48 (x3)
185115 -14 1630  SV2MJY DF9SJ JN48 (x2)
185400 -24 1630  PU2PPP DF9SJ 73
151230 -24 1452  IK4RVY DF9SJ R-02
161230 -18 1100  DF9SJ ON4DS -07 (x2)
162415 -23 1425  PE1NPS DF9SJ RR73 (x2)
184645 -24 1604  PU5FLP DF9SJ JN48
195345 -14  766  DF9SJ F4AFO RR73

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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