DK4CH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JN59

Receiver-side FT8 activity involving DK4CH, decoded by SO8OO in southeastern Poland. 1,439 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 19 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-06.

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 1,439 FT8 messages attributed to DK4CH as the transmitting token by decoded message structure across 19 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (65%), followed by 80 m (16%) and 20 m (15%). Most decodes (77%) fell within the six-hour window 17:00-23:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8.9 dB.

Overview

1,439
Messages attributed
19
UTC dates decoded
145
Active 15-min windows
-8.9 dB
Estimated median S/N

Bands

80m · 227 40m · 942 20m · 210 10m · 60
First attributed message: 2026-06-06
Last attributed message: 2026-09-06 19:39 UTC

Observed FT8 message patterns

Attributed sample
1,439 messages
Active dates
19 UTC dates
Estimated median S/N
-8.9 dB
Estimated 10th-90th percentile
-19.2 to +2 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 364, moderate (-15 to -9 dB) 366, strong (≥ -8 dB) 709.

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 DK4CH 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 DK4CH

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
JN59 · 868 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
777 km (approx.)
Last such locator decoded
2026-09-06 19:37 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 UTCBandDK4CH S/NCounterpartCounterpart S/NMsgsCapture
09-06 19:38 40m -1 / - PD3CFG - / -16 3 Partial capture
09-06 19:30 40m -1 / - IZ5IIN - / - 2 Partial capture
09-06 19:26 80m 0 / - DO5HOK - / - 2 Partial capture
09-06 19:24 80m 0 / - RN3YN - / - 3 Partial capture
09-06 19:23 80m -2 / - RY2B - / - 2 Partial capture
08-16 10:32 20m -18 / +9 IS0LBE -14 / -11 7 Partial capture
08-16 10:29 20m -15 / - R1IV - / - 3 Partial capture
08-16 10:24 20m -12 / -9 EA5DKA -16 / - 3 ✓ Closing observed
08-16 10:21 20m -15 / - M8IYL - / -11 5 ✓ Closing fragment
08-16 10:17 20m -15 / - UA4CQS - / - 3 Partial capture
08-16 10:17 20m - / - EB3JT -19 / - 3 Partial capture
08-16 10:14 20m -15 / - EA5QS - / - 2 ✓ Closing fragment
08-16 10:13 20m -22 / - EA3KY - / -12 2 Partial capture
08-16 10:04 20m -20 / - RW3C/P - / - 3 Partial capture
08-14 21:30 40m - / -17 RA3MT -11 / - 2 ✓ Closing fragment
08-14 21:22 40m -17 / - R1WCK - / -13 3 ✓ Closing fragment
08-14 21:22 40m - / - UA4FKT -7 / - 3 Partial capture
08-14 21:21 40m -11 / - OM1TD - / -5 3 ✓ Closing fragment
08-14 21:19 40m -11 / - E71DOC - / -13 3 ✓ Closing fragment
08-14 21:16 40m -15 / - TA3ZZ - / - 3 Partial capture
08-14 21:12 40m -13 / - TA3GO - / -11 3 ✓ Closing fragment
08-14 21:11 40m -17 / - YL3FW - / -14 3 ✓ Closing fragment
08-14 21:05 40m -16 / - I2SDD -21 / - 2 ✓ Closing observed
08-14 21:01 40m -15 / - IK0QDM -19 / -10 2 ✓ Closing observed
08-14 20:58 40m -12 / - SV1TEU - / -22 4 Partial capture
08-14 20:56 40m -14 / - YL3BU - / -13 2 ✓ Closing fragment
08-14 20:54 40m - / 0 OZ1HPS -14 / - 2 ✓ Closing fragment
08-14 20:51 40m -17 / - PD0WH - / -13 2 Partial capture
08-14 20:50 40m -19 / -2 F1HFP -20 / +3 5 ✓ Full exchange observed
08-14 20:46 40m -16 / - RC1C - / - 4 Partial capture
08-14 20:44 40m -14 / - MM0JTV - / -16 4 ✓ Closing fragment
08-14 20:40 40m -15 / - IU4TPU - / -8 2 Partial capture
08-14 20:39 40m -16 / -2 UF1A -17 / -4 5 ✓ Full exchange observed
08-14 20:37 40m -17 / - DJ1OJ - / - 2 Partial capture
08-14 20:30 40m -16 / - EI2IIB - / - 3 Partial capture
08-14 20:29 40m -19 / - SP3FNW - / -16 2 Partial capture
08-14 20:22 40m - / +5 DK7ZT -15 / - 2 Partial capture
08-14 20:18 40m -12 / - F1IQH - / -7 2 Partial capture
08-14 20:16 40m -10 / - LA5XUA - / - 4 Partial capture
08-14 20:14 40m -16 / - YU1WT - / - 2 ✓ Closing fragment
08-14 20:12 40m -12 / - 5B4AMM - / - 2 Partial capture
08-14 20:10 40m -17 / - OE3PBS -2 / -9 4 ✓ Closing observed
08-14 20:06 40m -13 / - UB6OCP - / -10 3 ✓ Closing fragment
08-14 20:01 40m -14 / - M0TNI - / - 2 Partial capture
08-14 20:00 40m -15 / - SV4TFQ -21 / -4 4 ✓ Closing observed
08-14 19:56 40m -15 / - SP9SDX - / -15 3 ✓ Closing fragment
08-14 19:55 40m -10 / - DJ6OI/P - / -8 3 ✓ Closing fragment
08-14 19:46 40m -11 / -15 YO4GIY -17 / -11 4 ✓ Full exchange observed
08-14 19:44 40m -11 / - RA4AUY - / - 2 Partial capture
08-14 19:42 40m -14 / - GM0SDV - / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
212245 -16 1472  R1WCK DK4CH JN59
212300  -8 2151  DK4CH UA4FKT LO23
212315 -18 1472  R1WCK DK4CH R-13
212330  -7 2151  DK4CH UA4FKT LO23
212345 -16 1472  R1WCK DK4CH 73
212730 -16 1739  DK4CH IU2HUQ -06
213030 -10  827  DK4CH RA3MT -17 (x2)
193030  -2  674  IZ5IIN DK4CH JN59 (x2)
193315  -1  674  DK4CH IZ5IIN -12
193745  -7 1144  F1RIQ DK4CH JN59
193815  -2 1143  PD3CFG DK4CH R-16 (x3)
80m 
UTC    dB Audio  Message
200930  -4 2245  DK4CH SV1EKI KM18 (x3)
201115  -1 1202  UT3UZ DK4CH JN59
201130  -5 2245  DK4CH SV1EKI KM18
201145  -3 1202  UT3UZ DK4CH JN59
201200  +2 1202  DK4CH UT3UZ -11 (x2)
192300  -3  896  RY2B DK4CH JN59 (x2)
192415  +0  652  RN3YN DK4CH JN59 (x3)
192600  -3  809  DO5HOK DK4CH JN59 (x2)
20m 
UTC    dB Audio  Message
102500 -21 2110  DK4CH EA5DKA -09 (x2)
102645 -20 1634  LA8OOA DK4CH R-06
102815 -15 1120  YU4EA DK4CH JN59
102915 -19 1055  R1IV DK4CH JN59 (x3)
103215 -21 1569  IS0LBE DK4CH R-11
103230 -16 1570  DK4CH IS0LBE +09 (x2)
103345 -16 1571  IS0LBE DK4CH R-11 (x2)
103500 -16 1570  DK4CH IS0LBE +08
103515 -18 1570  IS0LBE DK4CH R-11
103715 -13  881  HB9ITP/P DK4CH JN59
60m 
UTC    dB Audio  Message
194500  +8  852  DK4CH 9A4ZM JN86 (x3)
10m 
UTC    dB Audio  Message
183930 -20 1370  DK4CH LZ5UY -01 (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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