DO4FB — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO52

Receiver-side FT8 activity involving DO4FB, decoded by SO8OO in southeastern Poland. 383 FT8 messages attributed to this token as transmitter, on 80m, across 12 UTC dates in the available aggregate history. Observed between 2026-07-20 and 2026-09-01.

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 383 FT8 messages attributed to DO4FB as the transmitting token by decoded message structure across 12 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (100%). Most decodes (90%) 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 (80%); the estimated median was -2.7 dB.

Overview

383
Messages attributed
12
UTC dates decoded
42
Active 15-min windows
-2.7 dB
Estimated median S/N

Bands

80m · 383
First attributed message: 2026-07-20
Last attributed message: 2026-09-01 17:59 UTC

Observed FT8 message patterns

Attributed sample
383 messages
Active dates
12 UTC dates
Estimated median S/N
-2.7 dB
Estimated 10th-90th percentile
-10 to +6 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 71, strong (≥ -8 dB) 307.

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 DO4FB 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 DO4FB

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
JO52 · 204 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
803 km (approx.)
Last such locator decoded
2026-09-01 17:59 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 UTCBandDO4FB S/NCounterpartCounterpart S/NMsgsCapture
09-01 18:19 80m - / - DH5YBE -3 / - 3 ✓ Closing fragment
09-01 17:45 80m - / +3 DL7UKM -18 / - 3 ✓ Closing fragment
09-01 17:42 80m -7 / -14 SP7SZJ -2 / -12 5 ✓ Full exchange observed
09-01 17:30 80m - / -8 DO4EB -7 / - 3 Partial capture
09-01 17:30 80m 0 / - OE3YMM - / - 2 Partial capture
09-01 17:27 80m - / - DL2EH -2 / - 2 Partial capture
08-19 19:04 80m -8 / -16 OE3WCR -12 / -13 19 Partial capture
08-19 18:36 80m -8 / -2 DM3YBN -18 / -16 5 ✓ Full exchange observed
08-19 18:36 80m - / - UR5RBP -4 / - 2 Partial capture
08-19 18:19 80m -5 / 0 SP5MXW/P +15 / +8 5 ✓ Full exchange observed
08-19 18:13 80m -8 / -7 SP9WAZ 0 / -6 5 ✓ Full exchange observed
08-19 18:10 80m - / +1 DK5OPA -19 / - 4 ✓ Closing fragment
08-19 18:10 80m -5 / - LY8O +1 / +1 3 ✓ Closing observed
08-14 23:03 80m -8 / -2 SP0DF +4 / - 5 ✓ Full exchange observed
08-14 23:01 80m -10 / 0 DO5PY +3 / +10 7 ✓ Full exchange observed
08-14 22:56 80m -14 / -10 TF3VS -13 / +8 5 ✓ Full exchange observed
08-13 22:07 80m +4 / +1 DO6JSA -6 / +7 4 ✓ Full exchange observed
08-13 22:04 80m -10 / -5 SA4AGM -3 / -9 5 ✓ Full exchange observed
08-13 21:58 80m -5 / - R7CD +6 / +5 3 ✓ Closing observed
08-13 21:53 80m +2 / -3 SP5WS -10 / -17 5 ✓ Full exchange observed
08-13 21:50 80m +4 / -18 YT1KN +1 / -2 5 ✓ Full exchange observed
08-13 21:48 80m +4 / - ON6CQ - / +7 2 ✓ Closing fragment
08-13 21:46 80m -8 / +6 DO1DMR -1 / - 5 ✓ Full exchange observed
08-13 21:44 80m 0 / -11 DL3XRZ -14 / -2 5 ✓ Full exchange observed
08-13 21:37 80m 0 / -7 G8OO -1 / +3 6 ✓ Full exchange observed
08-13 21:36 80m -4 / -9 D09AND/P -1 / - 5 ✓ Full exchange observed
08-13 21:31 80m -5 / -16 R3MDO -2 / -2 6 ✓ Full exchange observed
08-13 21:29 80m +7 / - R3ICU - / -21 5 Partial capture
08-13 21:25 80m +13 / +1 DP6SEVEN +5 / 0 3 Partial capture
08-13 21:25 80m +2 / - <...> - / +9 2 Partial capture
08-13 21:21 80m +5 / -3 DL9KM 0 / -3 5 ✓ Full exchange observed
08-13 21:20 80m +5 / - DO9JTR - / +6 2 ✓ Closing fragment
08-13 12:18 10m - / -12 IU4QRO -4 / - 2 Partial capture
08-13 12:02 10m - / +6 F4LNM -4 / - 3 ✓ Closing fragment
08-10 20:58 80m - / -11 II3DRC -13 / - 6 ✓ Closing fragment
08-10 20:58 80m - / - OZ0A +2 / - 3 ✓ Closing fragment
08-10 20:55 80m +2 / +5 DL9DBF -10 / - 4 ✓ Closing observed
08-10 20:53 80m - / - DK0KG -6 / - 3 ✓ Closing fragment
08-10 20:47 80m -2 / - HF9T 0 / -8 8 Partial capture
08-10 20:43 80m 0 / -9 YT5DL +8 / -4 5 ✓ Full exchange observed
08-10 20:42 80m -2 / 0 DA6IT -10 / +2 5 ✓ Full exchange observed
08-10 20:40 80m 0 / - EU1EU -5 / -10 3 ✓ Closing observed
08-10 20:34 80m - / 0 DO8JB -8 / - 6 ✓ Closing fragment
08-10 20:33 80m - / -17 EU1EU -16 / - 2 Partial capture
08-10 20:33 80m - / -13 HF5A +4 / - 3 ✓ Closing fragment
08-10 20:12 80m -6 / - JE6WOQ -12 / -15 8 ✓ Closing observed
08-10 20:08 80m -8 / - DC7PM +2 / +9 4 ✓ Full exchange observed
08-10 20:04 80m -4 / -5 F1PBZ -6 / 0 4 ✓ Full exchange observed
08-10 19:55 80m -3 / - CR5VP - / -17 4 ✓ Closing fragment
08-10 19:07 80m -6 / -19 HB3YOY -14 / -12 5 ✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
174300  -6 1359  SP7SZJ DO4FB RR73
174315  +2 1673  DO4FB SP7SZJ 73
174545 -13 1377  DO4FB DL7UKM JO62 (x3)
174730  +0 1377  CQ DO4FB JO52
174930  -4 1377  DO6KGS DO4FB RR73
175700  -5 1383  CQ DO4FB JO52                         a1 (x5)
181900  -5  831  DO4FB DH5YBE JO41 (x3)
10m 
UTC    dB Audio  Message
163700  +0 2708  DO4FB IQ4JO 73
163730 -11 1526  DO4FB IK1MJK/P JN35 (x3)
120200  -1  655  DO4FB F4LNM JN09 (x3)
121800  -7  645  DO4FB IU4QRO 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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