K4ZO — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM95

Receiver-side FT8 activity involving K4ZO, decoded by SO8OO in southeastern Poland. 83 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-18.

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 83 FT8 messages attributed to K4ZO as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (53%), followed by 80 m (30%) and 20 m (17%). Most decodes (100%) fell within the six-hour window 20:00-02:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (64%); the estimated median was -5 dB.

Overview

83
Messages attributed
13
UTC dates decoded
18
Active 15-min windows
-5 dB
Estimated median S/N

Bands

80m · 25 40m · 44 20m · 14
First attributed message: 2026-06-06
Last attributed message: 2026-09-18 00:09 UTC

Observed FT8 message patterns

Attributed sample
83 messages
Active dates
13 UTC dates
Estimated median S/N
-5 dB
Estimated 10th-90th percentile
-17 to +1 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 13, moderate (-15 to -9 dB) 17, strong (≥ -8 dB) 53.

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 K4ZO 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 K4ZO

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
EM95 · 30 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
7,876 km (approx.)
Last such locator decoded
2026-09-16 01:21 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 UTCBandK4ZO S/NCounterpartCounterpart S/NMsgsCapture
09-18 00:09 40m -5 / - KF9UG - / +6 2 ✓ Closing fragment
09-18 00:08 40m -5 / - KG5QPI - / -9 2 ✓ Closing fragment
09-18 00:08 40m - / - F6FHZ -24 / - 2 Partial capture
09-18 00:06 40m -2 / - 9K2WA - / -11 2 ✓ Closing fragment
09-16 01:22 80m - / -13 ON1JP -14 / - 2 Partial capture
09-16 01:22 80m - / - EB3JT -20 / - 7 Partial capture
09-16 01:18 80m -17 / - 6Y5HN -24 / -1 6 ✓ Closing observed
09-16 01:10 80m -12 / - PR7AR - / -14 2 ✓ Closing fragment
09-16 01:07 80m -12 / - 8R1TM - / -11 6 ✓ Closing fragment
09-11 00:03 80m - / - IN3WZS -1 / - 7 Partial capture
09-11 00:02 80m - / - 9A9TT +1 / - 6 Partial capture
09-11 00:00 80m -16 / - CT2HEX - / -14 3 ✓ Closing fragment
09-10 23:57 80m -17 / - HK4QHD - / -17 3 ✓ Closing fragment
09-10 23:53 80m - / - IZ2AMW -10 / - 5 Partial capture
09-10 23:52 80m -20 / - OL900LTV - / - 2 Partial capture
09-01 01:32 40m +6 / - RI1FJL - / -22 2 Partial capture
09-01 01:29 40m +4 / - RI1FJL - / - 2 Partial capture
08-28 01:01 40m 0 / - K5AHL - / -4 3 ✓ Closing fragment
08-28 01:00 40m -1 / - HF7X - / -15 2 ✓ Closing fragment
08-28 00:59 40m +1 / - KC5CD - / -7 2 ✓ Closing fragment
08-28 00:57 40m - / -11 UN2NC -11 / - 4 Partial capture
08-28 00:55 40m +1 / 0 UA3RBM -6 / -15 6 ✓ Full exchange observed
08-28 00:53 40m +2 / - TN8GD - / -14 3 ✓ Closing fragment
08-28 00:44 40m -5 / -3 RC2DD -1 / -15 5 ✓ Full exchange observed
08-28 00:43 40m - / - SP2ADY -15 / - 6 Partial capture
08-28 00:43 40m -6 / -2 UW5IM +3 / -11 5 ✓ Full exchange observed
08-28 00:40 40m -6 / - EB2FBI -11 / -18 3 ✓ Closing observed
08-28 00:40 40m -4 / -7 R2BQM -1 / -14 7 ✓ Full exchange observed
08-28 00:38 40m -4 / - <...> - / -21 3 Partial capture
08-20 23:59 20m -7 / - 5B4ARQ - / -12 2 ✓ Closing fragment
08-20 23:57 20m -4 / - 9A4AA - / -14 3 ✓ Closing fragment
08-18 23:35 40m - / -7 F5NBU -10 / - 3 ✓ Closing fragment
07-25 01:06 40m -18 / - OO0O - / - 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
010145  -2 1043  K5AHL K4ZO -04 (x3)
012915  +3  690  RI1FJL K4ZO EM95 (x4)
000645  -2 2089  9K2WA K4ZO R-11 (x2)
000800 -23 2089  K4ZO F6FHZ JN18
000815  -4 2089  KG5QPI K4ZO -09 (x2)
000900 -24 2090  K4ZO F6FHZ JN18
000915  -4 2089  KF9UG K4ZO +06 (x2)
80m 
UTC    dB Audio  Message
011900 -18 1985  6Y5HN K4ZO EM95 (x3)
012145 -24 1005  K4ZO 6Y5HN RR73
012200 -15 2052  6Y5HN K4ZO 73
012215 -23 2054  K4ZO EB3JT JN01
012245 -13 1622  K4ZO ON1JP -13
012245 -18 2053  K4ZO EB3JT JN01
012245  +9  525  K4ZO DL4GCJ JN47
012315 -16 1622  K4ZO ON1JP -13
012315 -18 2053  K4ZO EB3JT JN01 (x5)
20m 
UTC    dB Audio  Message
230445 -11 1018  <...> K4ZO EM95
235700  -5 1083  9A4AA K4ZO EM95 (x3)
235900  -4 1083  5B4ARQ K4ZO -12 (x2)
000000  -5 1083  4Z4DX K4ZO -11
000100  -5 1083  RA0AN K4ZO 73
200000 -14 1121  K4ZO 4Z4MU -10
200015  +0  941  <...> K4ZO EM95
10m 
UTC    dB Audio  Message
151545 -17 2235  K4ZO YG2CLC RR73

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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