US5ZCO — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Ukraine Most frequent locator attributed to this token: KN58

Receiver-side FT8 activity involving US5ZCO, decoded by SO8OO in southeastern Poland. 996 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 37 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-09-20.

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 996 FT8 messages attributed to US5ZCO as the transmitting token by decoded message structure across 37 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (52%), followed by 20 m (26%) and 80 m (20%). Most decodes (76%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

996
Messages attributed
37
UTC dates decoded
160
Active 15-min windows
-14 dB
Estimated median S/N

Bands

80m · 197 40m · 514 20m · 256 10m · 29
First attributed message: 2026-06-09
Last attributed message: 2026-09-20 18:26 UTC

Observed FT8 message patterns

Attributed sample
996 messages
Active dates
37 UTC dates
Estimated median S/N
-14 dB
Estimated 10th-90th percentile
-21 to +1 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 436, moderate (-15 to -9 dB) 214, strong (≥ -8 dB) 346.

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 US5ZCO 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 US5ZCO

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
KN58 · 712 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
687 km (approx.)
Last such locator decoded
2026-09-20 18:24 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 UTCBandUS5ZCO S/NCounterpartCounterpart S/NMsgsCapture
09-20 18:23 40m -8 / - PA7D -6 / -10 6 Partial capture
09-20 18:17 40m -6 / - BG0FQU - / - 4 Partial capture
09-14 20:12 40m -6 / - 9K2RT - / -9 3 ✓ Closing fragment
09-12 21:41 40m - / -6 DL7ACA -2 / - 3 ✓ Closing fragment
09-12 21:39 60m - / - DK7QJ -10 / - 2 Partial capture
09-12 21:34 40m - / - DL7ACA 0 / - 2 Partial capture
09-12 20:48 40m -4 / -11 ON1DGN -7 / -9 4 ✓ Full exchange observed
09-12 20:46 40m -6 / - MM6EJO - / -17 2 Partial capture
09-12 20:44 40m -4 / - DL7ACA - / +2 2 Partial capture
09-12 20:42 40m -3 / - SA6LDQ - / -9 4 ✓ Closing fragment
09-12 20:14 40m -6 / - IN3LHF -6 / -4 3 ✓ Closing observed
09-12 20:12 40m - / - IC8TEM +1 / - 6 Partial capture
09-12 20:12 40m -1 / - IU5VLR - / -8 3 Partial capture
09-12 20:11 40m -2 / - SV3CNX -8 / -2 3 ✓ Closing observed
09-12 20:09 40m +1 / -11 DL7UKM -5 / -2 5 ✓ Full exchange observed
09-12 20:05 40m +4 / - SP7TF - / -1 2 ✓ Closing fragment
09-12 20:03 40m -4 / - RF9C - / - 2 Partial capture
09-10 22:24 40m - / - GJ6WRI -19 / - 2 Partial capture
09-10 22:22 40m - / -14 F1PBZ -6 / - 2 ✓ Closing fragment
09-10 22:19 40m - / - F4BYA +13 / - 3 Partial capture
09-10 22:16 40m - / -6 K1ZZ -2 / - 2 ✓ Closing fragment
09-10 22:07 40m - / +9 IK4TVP -18 / - 2 ✓ Closing fragment
09-10 15:52 40m -8 / - BG7BVI - / - 7 Partial capture
09-10 15:37 40m 0 / - TK5NJ - / -12 3 ✓ Closing fragment
09-10 15:26 40m -4 / -21 PD4HT -20 / -16 12 ✓ Full exchange observed
09-10 15:23 40m -4 / - HG8LXL - / +6 2 ✓ Closing fragment
09-07 19:25 80m +12 / -10 EA6Y -4 / +7 5 ✓ Full exchange observed
09-01 19:05 40m -14 / - CN8NS - / - 2 Partial capture
08-31 21:47 40m -12 / - JT1A - / - 2 Partial capture
08-31 21:41 40m - / -14 EA6AJT -12 / - 2 ✓ Closing fragment
08-31 21:36 40m -10 / - VK7AC - / - 2 Partial capture
08-30 18:48 20m - / -13 PD0PWH -7 / - 5 ✓ Closing fragment
08-30 18:40 20m - / -6 EA2BHE -19 / - 3 ✓ Closing fragment
08-30 00:01 40m - / -15 PS8RV -22 / - 2 ✓ Closing fragment
08-29 23:54 40m - / -17 CT3IQ -12 / - 2 Partial capture
08-29 23:45 40m - / -19 N0YY -8 / - 2 ✓ Closing fragment
08-29 00:05 20m - / -17 TI5RR -5 / - 8 Partial capture
08-28 23:08 20m - / -17 YV5WL -1 / - 2 ✓ Closing fragment
08-28 22:32 20m - / -15 HI8CQ +4 / - 2 ✓ Closing fragment
08-28 22:29 20m - / -12 AA3B +10 / - 3 ✓ Closing fragment
08-28 20:34 20m - / - M0IEP 0 / - 2 ✓ Closing fragment
08-28 20:27 20m - / -16 TA4SSK -2 / - 4 ✓ Closing fragment
08-28 20:15 20m - / -1 F4JZW +20 / - 4 Partial capture
08-28 19:45 20m -7 / - YI1SAL - / - 5 Partial capture
08-28 19:44 20m -18 / - <...> - / -10 2 Partial capture
08-28 19:37 20m -6 / - K1CXW - / - 2 Partial capture
08-28 18:06 20m -15 / - ER35MD - / - 3 Partial capture
08-27 21:30 20m - / -5 N0EG -10 / - 2 Partial capture
08-27 21:14 40m - / - IU0PXF -6 / - 8 Partial capture
08-27 20:57 20m - / -9 W2BCC -14 / - 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
201045  -8 1689  CQ US5ZCO KN58
201200  -9 1683  9K2RT US5ZCO KN58 (x3)
181745  -4 1637  BG0FQU US5ZCO KN58 (x4)
182330  -4 1548  US5ZCO PA7D JO23 (x3)
182445  -5 1549  CQ US5ZCO KN58
182500  -7 1548  US5ZCO PA7D JO23
182545  -9 1549  PA7D US5ZCO -10 (x2)
60m 
UTC    dB Audio  Message
213930 -12 1833  US5ZCO DK7QJ JO41 (x2)
80m 
UTC    dB Audio  Message
204245 -13 1026  US5ZCO CT3MD RR73
204300  +3 1702  CT3MD US5ZCO 73
204330  +2 1702  JE6WOQ US5ZCO KN58 (x3)
193230 -14 1397  US5ZCO EN35UKR -09
193245  +3 1703  <...> US5ZCO R-04 (x2)
182845  -7 1954  US5ZCO EN35UKR -13
182900  +4 1754  <...> US5ZCO R-08
192515 +12 1705  EA6Y US5ZCO KN58
192630  -5 1653  US5ZCO EA6Y -10
192645 +13 1705  EA6Y US5ZCO R+07
192700  -4 1653  US5ZCO EA6Y RR73
192715 +11 1705  EA6Y US5ZCO 73
20m 
UTC    dB Audio  Message
000800  -6  904  US5ZCO TI5RR -17 (x3)
195500 -15 2106  US5ZCO E75C RR73
184015 -20 1708  US5ZCO EA2BHE IN83 (x3)
184345 -15 1330  US5ZCO IZ0EAC RR73
184545  -2 2215  US5ZCO IQ4JO JN63
184845  -6 1707  US5ZCO PD0PWH JO21 (x5)
185315 -15 1708  US5ZCO PD1PBX JO21
10m 
UTC    dB Audio  Message
114315 -18 1810  SN4WWA US5ZCO 73
114345 -20 1810  II6WWA US5ZCO KN58 (x9)
115245 -22 1753  II2WWA US5ZCO KN58 (x5)

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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