KM4TDZ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM78

Receiver-side FT8 activity involving KM4TDZ, decoded by SO8OO in southeastern Poland. 37 FT8 messages attributed to this token as transmitter, on 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-08-28.

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 37 FT8 messages attributed to KM4TDZ as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (92%) fell within the six-hour window 22:00-04:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's weak S/N range (68%); the estimated median was -17 dB.

Overview

37
Messages attributed
13
UTC dates decoded
16
Active 15-min windows
-17 dB
Estimated median S/N

Bands

20m · 37
First attributed message: 2026-06-08
Last attributed message: 2026-08-28 00:56 UTC

Observed FT8 message patterns

Attributed sample
37 messages
Active dates
13 UTC dates
Estimated median S/N
-17 dB
Estimated 10th-90th percentile
-20 to -13 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 25, moderate (-15 to -9 dB) 12, strong (≥ -8 dB) 0.

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 KM4TDZ 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 KM4TDZ

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
EM78 · 25 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
7,859 km (approx.)
Last such locator decoded
2026-08-28 00:55 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 UTCBandKM4TDZ S/NCounterpartCounterpart S/NMsgsCapture
09-15 02:27 80m - / - PA3KUS 0 / - 6 Partial capture
09-13 05:32 40m - / - IK2EST -14 / - 2 Partial capture
09-13 05:26 40m - / - IU2EFB -2 / - 2 Partial capture
09-02 03:22 80m - / 0 K4JJQ -24 / - 2 ✓ Closing fragment
08-31 04:28 80m - / - IK5CHL -11 / - 3 Partial capture
08-28 06:30 20m - / -18 EA3ICF -14 / - 4 ✓ Closing fragment
08-28 00:54 20m -14 / - TF1SH - / -3 4 Partial capture
08-27 07:08 40m - / -19 GJ0KYZ -12 / - 2 Partial capture
08-27 02:05 40m - / - IZ8DBJ -2 / - 2 Partial capture
08-26 01:40 20m - / -16 7Z1DR -2 / - 2 ✓ Closing fragment
08-26 01:09 20m -17 / - EP2AES - / - 3 Partial capture
08-23 22:47 20m -19 / - M0LAD - / - 3 Partial capture
08-23 22:41 20m -18 / - IW5DLY -18 / - 7 ✓ Closing observed
08-20 23:55 20m - / -5 9K2GR +6 / - 2 ✓ Closing fragment
08-20 23:42 20m - / -3 9K2GR +4 / - 2 Partial capture
08-06 01:32 20m - / - DL4GCJ -12 / - 2 Partial capture
08-03 08:17 20m - / -20 DH9DR -17 / - 6 Partial capture
07-28 10:46 20m - / -21 PD1ADA -18 / - 8 ✓ Closing fragment
07-23 00:12 20m - / -16 A61QQ -12 / - 2 ✓ Closing fragment
07-22 16:32 20m - / -15 TF4M -7 / - 3 Partial capture
07-20 10:01 20m - / - PD1PK -16 / - 2 Partial capture
07-09 11:42 20m - / - HB9SDO -18 / - 3 Partial capture
07-09 11:25 20m - / -14 M0UTD -2 / - 2 Partial capture
07-03 01:47 20m -18 / - <...> - / - 2 Partial capture
06-30 06:56 20m - / - IZ5SIH -16 / - 3 Partial capture
06-30 06:52 20m - / -1 EA5GVJ -16 / - 2 ✓ Closing fragment
06-23 06:16 20m - / -7 EA3IZF -18 / - 4 Partial capture
06-23 06:15 20m - / -5 HB9EFK -9 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
020500  -2 2215  KM4TDZ IZ8DBJ JN70 (x2)
070815 -11  727  KM4TDZ GJ0KYZ -19 (x2)
052645  -4 1579  KM4TDZ IU2EFB JN45 (x2)
053215 -14 1113  KM4TDZ IK2EST JN45 (x2)
235200 -11 2198  KM4TDZ I1RJP JN45
80m 
UTC    dB Audio  Message
042830 -14 2463  KM4TDZ IK5CHL JN53 (x3)
032215 -24  600  KM4TDZ K4JJQ +00 (x2)
022800 -11  997  KM4TDZ RR73; KZ4OZ <...> -06
022715  -7  959  KM4TDZ PA3KUS JO21 (x6)
20m 
UTC    dB Audio  Message
010930 -17 1276  EP2AES KM4TDZ EM78 (x3)
014015  +0  627  KM4TDZ 7Z1DR -16 (x2)
130915 -21 1281  KM4TDZ GI4SZW RRR
005400 -15 1202  TF1SH KM4TDZ EM78 (x4)
063015 -13 1200  KM4TDZ EA3ICF JN11 (x4)
063315  -7 1204  KM4TDZ MW7KFZ IO81

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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