US4EX — 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: Ukraine Most frequent locator attributed to this token: KN78

Receiver-side FT8 activity involving US4EX, decoded by SO8OO in southeastern Poland. 1,434 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 28 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-15.

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 1,434 FT8 messages attributed to US4EX as the transmitting token by decoded message structure across 28 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (76%), followed by 40 m (12%) and 80 m (5%). Most decodes (61%) fell within the six-hour window 19:00-01:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8.8 dB.

Overview

1,434
Messages attributed
28
UTC dates decoded
145
Active 15-min windows
-8.8 dB
Estimated median S/N

Bands

160m · 56 80m · 72 40m · 166 20m · 1,094 10m · 46
First attributed message: 2026-06-06
Last attributed message: 2026-10-15 15:19 UTC

Observed FT8 message patterns

Attributed sample
1,434 messages
Active dates
28 UTC dates
Estimated median S/N
-8.8 dB
Estimated 10th-90th percentile
-18.5 to +4 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 303, moderate (-15 to -9 dB) 422, 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 US4EX 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 US4EX

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
KN78 · 979 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
971 km (approx.)
Last such locator decoded
2026-10-15 15:18 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 UTCBandUS4EX S/NCounterpartCounterpart S/NMsgsCapture
10-15 15:17 40m -4 / - 9A5AZK - / -10 4 ✓ Closing fragment
10-15 15:04 160m -17 / - H49A - / -17 8 Partial capture
10-04 17:11 40m +5 / - UA9ZZ - / -4 3 Partial capture
10-04 17:06 40m 0 / - TA2EE - / -14 2 ✓ Closing fragment
10-04 17:05 40m -2 / -1 YL3CW +4 / 0 5 ✓ Full exchange observed
10-04 17:02 40m 0 / +1 F5PBG -8 / -8 5 ✓ Full exchange observed
10-04 16:43 40m -1 / - Z62NS - / - 2 Partial capture
10-04 16:42 40m -5 / - EU6UE - / -7 2 ✓ Closing fragment
10-04 16:40 40m +4 / -9 SQ6WA -3 / -1 4 ✓ Full exchange observed
10-03 16:34 40m 0 / +3 UR5CBP -10 / +4 3 ✓ Full exchange observed
10-03 16:30 40m -3 / - S57ACD -5 / -8 8 ✓ Closing observed
10-03 16:28 40m +1 / -15 US0QV -4 / - 4 ✓ Closing observed
10-03 16:25 40m +6 / -4 UR5WBO +2 / -5 4 ✓ Full exchange observed
10-03 16:21 40m -4 / - UN3P - / -11 2 ✓ Closing fragment
10-03 16:19 40m +5 / - SV2HTW +8 / +3 4 ✓ Closing observed
10-01 15:03 80m -9 / - FW1P - / - 11 Partial capture
10-01 14:54 80m -13 / - FW1P - / - 8 Partial capture
10-01 14:46 80m -20 / - FW1P - / - 7 Partial capture
10-01 14:28 80m -21 / - FW1P - / - 9 Partial capture
10-01 13:49 80m -16 / - FW1P - / - 5 Partial capture
09-29 07:04 40m -4 / - TA2EE - / - 5 Partial capture
09-29 06:46 40m -4 / -9 OT7K +6 / - 5 ✓ Full exchange observed
09-29 06:25 40m +2 / - PE1NPS -10 / -9 11 Partial capture
09-29 06:25 40m 0 / -10 G0BLB -8 / -14 7 ✓ Full exchange observed
09-29 06:20 40m -4 / - G8KHF - / -6 8 ✓ Closing fragment
09-29 06:16 40m -4 / - MI7RDK - / - 6 Partial capture
09-29 06:14 40m -7 / -10 HA1ZW -8 / -7 5 ✓ Full exchange observed
09-29 06:12 40m -2 / -5 PI4DX +4 / +8 4 ✓ Full exchange observed
09-29 06:09 40m -3 / - LZ2PAJ - / - 2 Partial capture
09-29 06:07 40m -1 / -5 CR7BRV -13 / -1 4 ✓ Full exchange observed
09-29 03:14 40m - / -2 W4PSK -2 / - 2 ✓ Closing fragment
09-29 02:53 40m - / -10 4L8A -4 / - 2 Partial capture
09-29 02:14 40m - / -4 A99AA -12 / - 3 ✓ Closing fragment
09-29 02:07 40m - / -15 4Z5PG -12 / - 3 ✓ Closing fragment
09-29 01:14 40m - / - M7LYG -12 / - 4 Partial capture
09-29 00:43 40m - / - EA1IOK -10 / - 3 Partial capture
09-28 23:23 40m - / +3 OS4K -9 / - 3 Partial capture
09-28 22:36 40m - / - F6FDY -10 / - 3 Partial capture
09-28 22:36 40m - / - F6FHZ -18 / - 5 Partial capture
09-28 22:31 40m - / - F6FHZ -10 / - 3 Partial capture
09-28 22:30 40m - / -13 JY5IB -17 / - 2 ✓ Closing fragment
09-28 21:43 40m - / - EA3AAY -10 / - 3 Partial capture
09-28 21:21 40m - / - EA1IOK -8 / - 4 Partial capture
09-28 21:20 40m - / - F6FHZ -14 / - 4 Partial capture
09-28 20:52 40m -4 / - BG2ATH - / - 9 Partial capture
09-28 20:47 40m - / -5 EA9ABC -13 / - 2 ✓ Closing fragment
09-28 20:45 40m -14 / - JH5LCN - / - 2 ✓ Closing fragment
09-28 20:21 40m - / - DK8HC -9 / - 3 Partial capture
09-28 20:08 40m -18 / +6 TA2VUZ -10 / - 6 Partial capture
09-28 20:00 40m -8 / - JG3LGD - / 0 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

10m 
UTC    dB Audio  Message
114415 -11  905  <...> US4EX KN78 (x9)
115245 -11 2623  CT2KCK US4EX -12
130030 -24 1435  <...> US4EX KN78
142215  -4  632  YE1AJE US4EX KN78
140215  -6  420  US4EX OE4DJN -03 (x2)
105930 -15 1667  US4EX RR73; DH7ZP <...> -20
40m 
UTC    dB Audio  Message
170415  -4 1594  F5PBG US4EX RR73
170500  +2 2262  YL3CW US4EX KN78
170515  +3 2262  US4EX YL3CW -01
170530  -2 2262  YL3CW US4EX R+00
170545  +5 2262  US4EX YL3CW RR73
170600  -5 2262  YL3CW US4EX 73
170630  -5 2262  TA2EE US4EX -14 (x2)
171115  +6 2625  UA9ZZ US4EX -04 (x3)
151745  -8 1267  9A5AZK US4EX KN78 (x4)
160m 
UTC    dB Audio  Message
183315 +15  851  RI1FJL US4EX KN78 (x2)
171515  +4  975  RI1FJZ US4EX KN78 (x5)
150445 -16 1934  H49A US4EX KN78 (x8)
80m 
UTC    dB Audio  Message
145700 -11 1279  FW1P US4EX KN78 (x15)
20m 
UTC    dB Audio  Message
223145  -7 1574  EA8DNB US4EX KN78
223645  -6 1283  K3ZK US4EX KN78 (x4)
224345 -14 1284  HC7AE US4EX KN78
233400  -6  874  US4EX K3STL -17 (x2)
234000  -1 2504  US4EX N3YPL -16 (x3)
003500  -8 2554  US4EX K1CPJ -17 (x3)
030330  -7 1957  8Z1IT US4EX KN78

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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