OK4SD — 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: Czech Republic Most frequent locator attributed to this token: JN79

Receiver-side FT8 activity involving OK4SD, decoded by SO8OO in southeastern Poland. 1,127 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, 10m, across 44 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-22.

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 1,127 FT8 messages attributed to OK4SD as the transmitting token by decoded message structure across 44 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (53%), followed by 80 m (25%) and 40 m (19%). Most decodes (73%) fell within the six-hour window 18:00-00:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (91%); the estimated median was +1 dB.

Overview

1,127
Messages attributed
44
UTC dates decoded
134
Active 15-min windows
+1 dB
Estimated median S/N

Bands

160m · 14 80m · 285 60m · 13 40m · 213 20m · 593 10m · 9
First attributed message: 2026-06-06
Last attributed message: 2026-10-22 15:52 UTC

Observed FT8 message patterns

Attributed sample
1,127 messages
Active dates
44 UTC dates
Estimated median S/N
+1 dB
Estimated 10th-90th percentile
-8 to +10.5 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 86, strong (≥ -8 dB) 1,024.

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 OK4SD 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 OK4SD

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
JN79 · 805 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
491 km (approx.)
Last such locator decoded
2026-10-22 15:52 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 UTCBandOK4SD S/NCounterpartCounterpart S/NMsgsCapture
10-22 15:51 80m +4 / - MM0ULL - / - 2 Partial capture
10-22 15:49 80m +3 / - OD5ZZ - / - 4 Partial capture
10-22 15:48 80m +8 / - MM0ULL - / - 2 Partial capture
10-22 15:45 80m +4 / - OE8JMT - / - 5 Partial capture
10-22 15:43 80m +10 / -1 OK2BUZ +8 / +3 6 ✓ Full exchange observed
10-12 22:01 80m +7 / - OY1HJ - / - 3 Partial capture
10-12 21:58 80m +6 / - TF4M - / -20 4 ✓ Closing fragment
10-12 21:56 80m +10 / - 5B4AMX - / -7 4 ✓ Closing fragment
10-12 21:54 80m +5 / 0 F5PBG -5 / -1 4 ✓ Full exchange observed
10-12 21:52 80m +12 / -7 OH6FSO -11 / -20 7 ✓ Full exchange observed
10-12 21:48 80m +9 / -13 EA8UP -6 / -13 7 ✓ Full exchange observed
10-07 02:50 80m +2 / - 4X1YA - / - 2 Partial capture
10-07 02:47 80m +2 / - EA1IOK - / - 2 Partial capture
10-06 21:33 60m 0 / +5 ON1JP -17 / -17 5 ✓ Full exchange observed
10-06 21:32 60m -2 / -19 VE1YX -16 / -11 6 ✓ Full exchange observed
10-06 21:29 60m -3 / - OH6FSO - / -6 6 ✓ Closing fragment
10-05 22:40 80m +2 / -12 GM6URC -10 / -8 4 ✓ Full exchange observed
10-05 22:36 80m 0 / +5 OM1AGE +4 / -16 7 ✓ Full exchange observed
10-05 22:35 80m +5 / +2 IQ2AAH -10 / -1 5 ✓ Full exchange observed
10-05 22:27 40m -18 / - K1RH - / - 2 Partial capture
10-05 22:26 40m -12 / - AG8AR - / - 5 Partial capture
10-05 22:25 40m -10 / - WA4UVH - / -22 2 ✓ Closing fragment
10-05 22:23 40m -12 / - KD3BVL - / -18 2 Partial capture
10-05 22:21 40m -12 / - K1RH - / -20 4 Partial capture
10-05 22:19 40m -9 / - WA4UVH - / - 3 Partial capture
10-05 22:17 40m -6 / -3 K1ZZ -1 / - 4 ✓ Closing observed
10-05 03:44 80m +2 / - CT2GQA - / - 5 Partial capture
10-05 03:08 40m +8 / - N4BWW - / -24 15 ✓ Closing fragment
10-04 01:04 80m 0 / - W1DFW - / - 3 Partial capture
10-04 01:03 80m +8 / - LY8O - / - 3 Partial capture
10-04 01:01 80m +2 / -3 DO5HB -3 / -8 4 ✓ Full exchange observed
10-04 00:43 40m - / -3 EX7CQ -6 / - 2 ✓ Closing fragment
10-03 01:45 40m - / -12 KI8JP -8 / - 2 ✓ Closing fragment
10-03 01:39 40m - / -14 N2LQH -8 / - 2 ✓ Closing fragment
09-28 21:51 80m +14 / -9 CN8WK +10 / -1 5 ✓ Full exchange observed
09-28 21:49 80m +14 / - 8S2C - / - 2 Partial capture
09-28 21:46 80m +12 / - SP1MGM +21 / +7 5 ✓ Full exchange observed
09-28 21:45 80m +12 / 0 R3ICU 0 / -14 5 ✓ Full exchange observed
09-28 21:43 80m +8 / -1 YO2UKG +16 / -3 6 ✓ Full exchange observed
09-28 21:42 80m +12 / -1 DL9KM -1 / -16 7 ✓ Full exchange observed
09-28 21:42 80m +12 / -6 DO8JB +5 / -2 5 ✓ Full exchange observed
09-28 21:41 80m +10 / -3 M0WID +6 / +2 5 ✓ Full exchange observed
09-28 21:41 80m - / - R3ICU -2 / - 3 Partial capture
09-28 21:40 80m +9 / +8 OH6FSO -4 / -13 5 ✓ Full exchange observed
09-26 03:43 80m -10 / - KF8EXX - / - 2 Partial capture
09-23 03:18 40m - / -11 KN0BLE -10 / - 2 ✓ Closing fragment
09-23 02:53 80m +4 / - N8HRZ - / - 5 Partial capture
09-22 21:30 80m +5 / - RI1FJZ - / - 25 Partial capture
09-19 05:58 40m +8 / - ZL3IO - / - 4 Partial capture
09-19 05:57 40m +9 / - OS4K - / - 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
154430 +13 2509  OK2BUZ OK4SD 73
154445  +8 2248  OK4SD OK2BUZ 73
154515  +3 2509  OE8JMT OK4SD JN79 (x5)
154815  +9 2509  MM0ULL OK4SD JN79 (x2)
154945  +4  751  OD5ZZ OK4SD JN79 (x4)
155145  +6  751  MM0ULL OK4SD JN79 (x2)
60m 
UTC    dB Audio  Message
213045  +0 1913  OH6FSO OK4SD JN79 (x3)
213200 -16 1766  OK4SD VE1YX FN74
213215  -2 1397  OH6FSO OK4SD 73
213230 -17 1766  OK4SD VE1YX FN74
213245  +5 1397  VE1YX OK4SD -11
213300 -15 1395  OK4SD VE1YX R-19
213300 -17 1533  OK4SD ON1JP +05
213315  -9 1397  VE1YX OK4SD RR73
213330 -16 1395  OK4SD VE1YX 73
213330 -17 1533  OK4SD ON1JP +05
213345  -1 1397  ON1JP OK4SD R-17
213400 -17 1533  OK4SD ON1JP RR73
213415  +0 1397  ON1JP OK4SD 73
40m 
UTC    dB Audio  Message
222200 -12 2287  K1RH OK4SD R-20 (x3)
222330  -7 2287  KD3BVL OK4SD JN79 (x2)
222500 -12 2287  WA4UVH OK4SD R-22 (x2)
222600 -17 2287  AG8AR OK4SD JN79 (x2)
222700 -16 2287  K1RH OK4SD JN79 (x2)
222800 -14 2287  AG8AR OK4SD JN79 (x3)
223000 -12 2287  K1RH OK4SD JN79
20m 
UTC    dB Audio  Message
234015  +9 2588  9J2FI OK4SD JN79
234045  +5 2588  OH6FSO OK4SD JN79 (x2)
234145 +11 2588  F6EQD OK4SD JN79 (x3)
234315  +8 2588  OH6FSO OK4SD JN79 (x6)
234645 +12 2588  NK4L OK4SD JN79 (x3)
10m 
UTC    dB Audio  Message
145600  -9 1967  OK4SD SV1CQN RR73
095630  -9 1094  OK4SD CT3MD -13 (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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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