KR4GRW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: United States Most frequent locator attributed to this token: EM92

Receiver-side FT8 activity involving KR4GRW, decoded by SO8OO in southeastern Poland. 18 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-08-26 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 18 FT8 messages attributed to KR4GRW as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (94%), followed by 40 m (6%). In this small sample, the estimated median decoder S/N was -12 dB; no usual signal pattern is inferred.

Overview

18
Messages attributed
3
UTC dates decoded
7
Active 15-min windows
-12 dB
Estimated median S/N

Bands

40m · 1 20m · 17
First attributed message: 2026-08-26
Last attributed message: 2026-09-20 03:49 UTC

Observed FT8 message patterns

Attributed sample
18 messages
Active dates
3 UTC dates
Estimated median S/N
-12 dB
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3, moderate (-15 to -9 dB) 11, strong (≥ -8 dB) 4.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with KR4GRW in decoded directed-looking exchanges:

Most frequent locator attributed to KR4GRW

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
EM92 · 10 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,126 km (approx.)
Last such locator decoded
2026-09-20 03:49 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 UTCBandKR4GRW S/NCounterpartCounterpart S/NMsgsCapture
09-20 03:32 40m - / - MI7XHT -14 / - 2 Partial capture
08-27 05:30 40m - / - IZ0HDB -8 / - 3 Partial capture
08-27 05:21 40m - / - PD1ADA -12 / - 6 Partial capture
08-27 05:19 40m - / -14 DL1EMV -3 / - 3 ✓ Closing fragment
08-27 05:06 20m - / -9 UA3GIE +8 / - 3 ✓ Closing fragment
08-27 04:49 20m -7 / - 4X1UF - / - 3 Partial capture
08-27 04:42 20m -13 / - SV2HTW - / - 2 Partial capture
08-27 04:34 20m - / -16 4L1FL +13 / - 13 ✓ Closing fragment
08-26 05:46 20m -12 / -23 M0KSE +6 / - 5 ✓ Closing observed
08-26 05:44 20m - / -20 HZ1TT -7 / - 5 ✓ Closing fragment
08-26 05:35 20m - / - R8CKD +1 / - 2 Partial capture
08-26 05:06 20m -22 / - NL8F - / - 2 ✓ Closing fragment
08-26 04:40 40m - / -19 DJ0MAB -2 / - 4 Partial capture
08-26 04:39 40m - / -12 LY2J -11 / - 3 ✓ Closing fragment
08-25 04:17 20m - / -11 OD5KU +10 / - 2 ✓ Closing fragment
08-24 05:40 20m - / -14 F5SZB +10 / - 9 ✓ Closing fragment
08-24 05:39 20m - / -14 UR3LM +25 / - 4 ✓ Closing fragment
08-24 05:37 20m - / +1 HC2GRC -6 / - 2 ✓ Closing fragment
08-24 05:23 20m - / -5 E74K -14 / - 2 ✓ Closing fragment
08-24 05:04 40m - / -25 PD0WL -16 / - 7 ✓ Closing fragment
08-24 04:55 40m - / -10 OE5CCN +10 / - 2 ✓ Closing fragment
08-24 04:43 40m - / -15 IZ4JMA -12 / - 2 Partial capture
08-24 04:35 40m - / -15 F4IFO -3 / - 6 ✓ Closing fragment
08-24 04:33 40m - / +1 DK7ZT +2 / - 4 ✓ Closing fragment
08-24 04:24 40m - / -14 MI0OBC -4 / - 2 ✓ Closing fragment
08-24 04:08 40m - / -11 DL3OCF -4 / - 2 ✓ Closing fragment
08-24 04:06 40m - / -9 DL8TV -4 / - 5 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
052130  -9 1996  KR4GRW PD1ADA JO21 (x5)
053030  -8 1633  KR4GRW IZ0HDB JN62 (x3)
032730 -18 1532  KR4GRW OS4K -08
033100  -6 3001  KR4GRW F5PBG IN78
033200 -15 2655  KR4GRW MI7XHT IO64 (x2)
033430 +16 2771  KR4GRW IK6DLK JN63
034915 -15 2807  W6F KR4GRW EM92
042215  -6 2789  KR4GRW F5PBG IN78
20m 
UTC    dB Audio  Message
043845 +15 2906  KR4GRW 4L1FL RR73 (x4)
044230 -13 3041  SV2HTW KR4GRW EM92 (x2)
044900  -1 2870  4X1UF KR4GRW EM92 (x3)
045100  -5 2874  OH2XO KR4GRW +16
050000 -12 2990  ZL2BX KR4GRW EM92
050630 +14 2593  KR4GRW UA3GIE KO92 (x3)
050730 -18  915  KR4GRW EA5IXH IM98

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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