DK4FJ — 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: Fed. Rep. of Germany Most frequent locator attributed to this token: JO40

Receiver-side FT8 activity involving DK4FJ, decoded by SO8OO in southeastern Poland. 73 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, across 17 UTC dates in the available aggregate history. Observed between 2026-06-15 and 2026-11-06.

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 73 FT8 messages attributed to DK4FJ as the transmitting token by decoded message structure across 17 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (36%), followed by 40 m (33%) and 80 m (25%). Most decodes (58%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -16 dB.

Overview

73
Messages attributed
17
UTC dates decoded
29
Active 15-min windows
-16 dB
Estimated median S/N

Bands

160m · 5 80m · 18 40m · 24 20m · 26
First attributed message: 2026-06-15
Last attributed message: 2026-11-06 06:34 UTC

Observed FT8 message patterns

Attributed sample
73 messages
Active dates
17 UTC dates
Estimated median S/N
-16 dB
Estimated 10th-90th percentile
-20 to -9 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 42, moderate (-15 to -9 dB) 24, strong (≥ -8 dB) 7.

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 DK4FJ 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 DK4FJ

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
JO40 · 39 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
911 km (approx.)
Last such locator decoded
2026-11-06 06:33 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 UTCBandDK4FJ S/NCounterpartCounterpart S/NMsgsCapture
11-06 06:33 80m -22 / - DO1OAS -2 / -7 3 ✓ Closing observed
11-06 06:32 80m - / - IU2THY +11 / - 3 Partial capture
11-04 06:24 80m - / -12 DO1ID -11 / - 2 ✓ Closing fragment
11-04 06:24 80m - / -19 SP9MOC +1 / - 6 Partial capture
11-04 06:15 80m - / -12 DK5OPA -14 / - 3 ✓ Closing fragment
11-04 06:08 80m - / -6 DD7EE +6 / - 3 ✓ Closing fragment
11-04 05:57 80m - / - DD7EE +13 / - 4 Partial capture
11-04 05:56 80m - / -15 F4FSY -10 / - 2 ✓ Closing fragment
11-03 21:14 160m - / - ER1BSV +10 / - 2 Partial capture
11-03 19:29 160m - / -8 DF4NR 0 / - 3 ✓ Closing fragment
11-03 16:06 80m - / -4 IN3XUG -5 / - 3 ✓ Closing fragment
11-03 16:02 80m -18 / - IN3XUG -3 / -12 2 Partial capture
11-03 16:00 80m - / -16 HB3YTK -13 / - 2 Partial capture
11-03 15:54 40m - / - SP3VAG -17 / - 2 ✓ Closing fragment
10-23 06:01 80m -24 / -1 DO6ZMR -21 / - 4 ✓ Closing observed
09-18 05:55 80m - / -7 DO1FZL -8 / - 4 Partial capture
09-17 14:23 40m - / -15 DF9DL -18 / - 3 ✓ Closing fragment
09-12 06:30 40m - / -13 EA3AKY -16 / - 2 Partial capture
09-12 06:25 40m - / -19 EA2DYB -12 / - 3 ✓ Closing fragment
09-11 19:58 160m -16 / -8 DO2RG -6 / - 11 ✓ Closing observed
09-11 17:48 80m - / -15 DL2YBG -6 / - 5 ✓ Closing fragment
09-11 17:44 80m - / - DO2KMB -2 / - 2 Partial capture
09-11 16:16 40m - / - DL9KM -5 / - 7 Partial capture
09-11 16:15 40m - / - DJ0MAB 0 / - 2 Partial capture
09-11 16:14 40m -7 / -6 ON4AOI +12 / +5 5 ✓ Full exchange observed
09-11 16:12 40m -10 / - UB3BDJ/6 - / -10 2 Partial capture
09-11 14:11 40m -19 / - F1PBZ - / +4 2 ✓ Closing fragment
09-10 09:22 40m - / - SH7MEM -7 / - 5 Partial capture
09-10 09:18 40m - / - DG9ZL -11 / - 2 Partial capture
09-07 19:38 160m - / -18 PA3FR -2 / - 3 ✓ Closing fragment
09-07 19:34 160m - / - UT4WT +12 / - 10 Partial capture
09-07 19:31 80m - / - DK0KG -7 / - 3 Partial capture
09-07 19:11 40m - / -7 F6BEC -3 / - 3 ✓ Closing fragment
09-07 18:58 40m - / - PA1RGX 0 / - 3 Partial capture
09-07 18:57 40m -15 / +1 OE8PIT +3 / -9 4 ✓ Full exchange observed
09-07 17:42 40m - / -2 DK0KG -9 / - 3 ✓ Closing fragment
08-28 17:47 40m - / -9 PA3GAE -7 / - 3 ✓ Closing fragment
08-28 17:18 40m - / -3 DM2CNE -4 / - 2 ✓ Closing fragment
08-26 10:10 20m - / -13 CT3MD -5 / - 4 ✓ Closing fragment
08-22 17:54 40m - / - DL1GLO -2 / - 4 Partial capture
08-22 17:30 40m - / -19 DM5JBN 0 / - 3 ✓ Closing fragment
08-22 17:28 40m - / -13 F1PBZ -7 / - 3 Partial capture
08-20 14:28 20m -8 / - R0AX -13 / 0 4 ✓ Closing observed
08-20 06:01 20m -9 / - K4YT - / -5 2 Partial capture
08-19 06:22 40m - / -13 RN2F -11 / - 4 ✓ Closing fragment
08-19 05:38 40m - / -11 OK1WCF -10 / - 2 Partial capture
08-19 05:35 40m - / - DH5BM -14 / - 2 ✓ Closing fragment
08-19 05:31 40m - / -10 DL6UM -11 / - 5 ✓ Closing fragment
08-19 05:26 40m - / - DL8WEM -5 / - 3 ✓ Closing fragment
08-17 20:01 80m -17 / - DH5BO -1 / -18 3 Partial capture

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
062430  -3 1057  DK4FJ SP9MOC -19 (x2)
062500 -14  238  DK4FJ DO1ID RR73
062530  +2 1057  DK4FJ SP9MOC -19 (x3)
063200 +11 2717  DK4FJ IU2THY JN45 (x3)
063315 -20 1422  CQ DK4FJ JO40
063330 -10 2743  DK4FJ F1MXE JN05
063345 -24 1422  DO1OAS DK4FJ -07 (x2)
063430  -2 1423  DK4FJ DO1OAS 73
063500  -2 1422  DK4FJ YT5DL KN04
160m 
UTC    dB Audio  Message
195945 -13 1456  DK4FJ DO2RG 73
200000 -16  970  DO2RG DK4FJ RRR
200015  -3 1456  DK4FJ DO2RG 73
200030 -17  970  DO2RG DK4FJ RRR
200045  -6 1456  DK4FJ DO2RG 73 (x4)
192900 +10 1176  DK4FJ DF4NR JO50 (x3)
195630 -14 1481  DK4FJ DH3KR R-06
211300 -21 1184  DK4FJ OE5PMM JN68
211430  +8 1183  DK4FJ ER1BSV KN47 (x2)
40m 
UTC    dB Audio  Message
161730  -3 1351  DK4FJ DL9KM JN68 (x4)
062515 -12  701  DK4FJ EA2DYB IN83 (x3)
062800 -16  700  CQ DK4FJ JO40
063045 -18 2071  DK4FJ EA3AKY JN01 (x2)
142315 -14 2405  DK4FJ DF9DL JO30 (x3)
155430 -21 1221  DK4FJ SP3VAG JO72 (x2)
20m 
UTC    dB Audio  Message
060200  -9 1187  K4YT DK4FJ -05
064515 -21 1187  DK4FJ IU0SIB R-01
085945 -10 1187  DK4FJ IZ4AIF JN54
142800 -10 2182  R0AX DK4FJ JO40 (x3)
142900 -11 2339  <DK4FJ> EA1/PE5X
142915 -13 2182  DK4FJ R0AX RR73
161230 -12 1596  CQ DK4FJ JO40 (x3)
101015  -7  991  DK4FJ CT3MD IM13 (x4)

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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