DO1SJF — 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 DO1SJF, decoded by SO8OO in southeastern Poland. 1,533 FT8 messages attributed to this token as transmitter, on 160m, 80m, 10m, across 37 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-10-07.

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 1,533 FT8 messages attributed to DO1SJF as the transmitting token by decoded message structure across 37 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (85%), followed by 160 m (8%) and 10 m (7%). Most decodes (83%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (68%); the estimated median was -4 dB.

Overview

1,533
Messages attributed
37
UTC dates decoded
182
Active 15-min windows
-4 dB
Estimated median S/N

Bands

160m · 118 80m · 1,307 10m · 108
First attributed message: 2026-06-07
Last attributed message: 2026-10-07 05:59 UTC

Observed FT8 message patterns

Attributed sample
1,533 messages
Active dates
37 UTC dates
Estimated median S/N
-4 dB
Estimated 10th-90th percentile
-17 to +8 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 188, moderate (-15 to -9 dB) 297, strong (≥ -8 dB) 1,048.

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 DO1SJF 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 DO1SJF

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 · 989 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
941 km (approx.)
Last such locator decoded
2026-10-07 05:59 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 UTCBandDO1SJF S/NCounterpartCounterpart S/NMsgsCapture
10-07 05:56 80m 0 / - NP3RK - / - 7 Partial capture
10-07 05:40 80m +1 / - N0BUZ - / - 8 Partial capture
10-07 05:37 80m 0 / - KY4WI -10 / -13 7 ✓ Closing observed
10-07 05:36 80m 0 / +8 MI0NWA -1 / -1 4 ✓ Full exchange observed
10-06 16:08 80m 0 / - OZ3AEV - / -8 2 Partial capture
10-06 15:52 80m +1 / - RX6LG - / - 8 Partial capture
10-06 15:50 80m -4 / -12 OM2WW +8 / +10 6 ✓ Full exchange observed
10-06 15:21 80m -7 / - OE5YCP -23 / -9 4 ✓ Closing observed
10-06 15:12 80m -4 / -3 EV1R +13 / -9 5 ✓ Full exchange observed
10-06 15:05 80m -4 / +7 OK2ZCH +17 / -5 5 ✓ Full exchange observed
10-06 14:15 80m -9 / - DO8JB - / - 3 Partial capture
10-06 14:00 80m -21 / - HA3PP -11 / - 4 ✓ Closing observed
10-06 13:59 80m -17 / - DO8JB - / - 3 Partial capture
10-06 12:13 80m -24 / - SP5DFK/QRP - / - 2 Partial capture
09-30 22:49 80m 0 / - RA0SMS - / - 2 Partial capture
09-30 22:47 80m +3 / -10 R9SR -18 / -12 5 ✓ Full exchange observed
09-30 22:45 80m 0 / - DO1OAS -2 / - 5 ✓ Full exchange observed
09-30 22:43 80m -4 / -6 EA1KCN -8 / -13 5 ✓ Full exchange observed
09-30 22:42 80m -4 / - UA9SY - / - 3 Partial capture
09-30 22:35 80m +4 / -14 KP4AA -22 / -16 9 ✓ Full exchange observed
09-30 22:32 80m +4 / -7 RN2F +5 / - 5 ✓ Full exchange observed
09-30 22:28 80m +5 / - UN0GY -9 / -16 4 ✓ Closing observed
09-30 22:17 80m -3 / - KP4AA - / -25 9 Partial capture
09-30 22:16 80m -1 / -10 EA8UP -8 / -4 5 ✓ Full exchange observed
09-30 22:11 80m +1 / -6 CT7AUT -16 / -13 7 ✓ Full exchange observed
09-30 22:08 80m -2 / - F4BJN - / -6 2 ✓ Closing fragment
09-30 22:06 80m - / -1 ON1BH +6 / - 2 ✓ Closing fragment
09-30 22:04 80m -2 / -2 F5PBG -2 / +2 4 ✓ Full exchange observed
09-30 22:02 80m +4 / - SN100PKP - / -7 3 Partial capture
09-29 05:30 80m 0 / - ON3ANY - / - 5 Partial capture
09-29 05:25 80m +3 / - KA9EKJ - / - 9 Partial capture
09-29 05:24 80m +3 / - KF8EXX -14 / -2 4 ✓ Closing observed
09-29 05:16 80m +5 / - AA7A - / -13 8 ✓ Closing fragment
09-29 05:14 80m +10 / - HI3RRR - / -16 3 ✓ Closing fragment
09-29 05:07 80m +4 / -16 WD4OBP -20 / -8 10 ✓ Full exchange observed
09-28 22:31 80m +3 / - SO100PKP - / -14 4 Partial capture
09-28 22:30 80m +1 / -18 EA5JK 0 / - 4 ✓ Full exchange observed
09-28 22:29 80m +4 / -11 EC3A -7 / +3 4 ✓ Full exchange observed
09-28 22:24 80m +8 / - F4CTJ - / - 3 ✓ Closing fragment
09-28 22:22 80m +6 / - TA4RC -14 / -12 4 ✓ Closing observed
09-28 22:20 80m +8 / -10 RC6OU +4 / +9 6 ✓ Full exchange observed
09-28 22:19 80m +12 / - DF7TV +12 / - 5 ✓ Full exchange observed
09-28 22:17 80m +12 / - TA4RC - / - 4 Partial capture
09-28 22:13 80m +12 / - LA4NM +6 / +10 7 ✓ Full exchange observed
09-28 22:12 80m +11 / -9 UB3DRL -2 / -8 7 ✓ Full exchange observed
09-28 22:11 80m +11 / - OH6FSO -14 / -11 4 ✓ Full exchange observed
09-28 22:09 80m +9 / - CT7AUT -13 / -11 4 ✓ Closing observed
09-28 19:25 80m +15 / - V51WH - / - 7 Partial capture
09-28 17:19 80m +10 / - RA2FU - / -23 2 ✓ Closing fragment
09-28 17:08 80m +2 / - ZS6BUN - / - 13 Partial capture

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
054015  +2 1660  N0BUZ DO1SJF JN48 (x8)
055630  -4 1829  NP3RK DO1SJF JN48 (x7)
160m 
UTC    dB Audio  Message
193600  -4 2045  CQ DO1SJF JN48
193645 -21 2045  DO1SJF DF4FS R+03 (x2)
193745 -22  800  DO1SJF OZ9GA JO46 (x2)
193830 -10 1045  OZ9GA DO1SJF -21
193845 -12  801  DO1SJF OZ9GA R+10
193900  -6 1045  OZ9GA DO1SJF RR73
193915 -14  801  DO1SJF OZ9GA 73
210045  +0 1045  EG1PDA DO1SJF JN48 (x2)
210230 -12 1114  DO1SJF EG1PDA +04 (x2)
175645  -6 2126  DO1SJF 9A5E -11 (x2)
10m 
UTC    dB Audio  Message
112415 -15 1737  DO1SJF PE9JAN JO22 (x2)
112500 -14 1727  PE9JAN DO1SJF -14
112515 -19 1737  DO1SJF PE9JAN R+09
112530 -23 1728  PE9JAN DO1SJF RR73
112545 -18 1737  DO1SJF PE9JAN 73
113345 -18 1671  SV1CQN DO1SJF R-06 (x2)
113815 -22 1673  PD0LBY DO1SJF -13 (x2)
114045 -21 1674  SV2TCC DO1SJF JN48 (x4)
184030 -23 1868  CQ DO1SJF JN48
40m 
UTC    dB Audio  Message
174915 -24 1895  DO1SJF IU4PSX JN54 (x2)

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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