RK4F — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: European Russia Locator transmitted in a decoded message: LO23

Receiver-side FT8 activity involving RK4F, decoded by SO8OO in southeastern Poland. 339 related FT8 messages, 107 CQ messages, observed on 160m, 80m, 40m, 20m, 10m, across 35 UTC dates. Heard between 2026-05-27 and 2026-08-24.

These are automated observations at the SO8OO receiver, not the station's official logbook. Times are UTC. Decoder S/N describes messages received at SO8OO; inferred entity and location data may be inaccurate for portable, remote or special-event operation.

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Overview

339
Related messages
107
CQ messages
35
UTC dates heard
-6 dB
Mean decoder S/N

Bands

First seen: 2026-05-27
Last seen: 2026-08-24 05:09 UTC

Activity Heatmap

Locator transmitted by RK4F

Approximate centre of LO23, decoded 2026-08-24 07:08 UTC. A transmitted locator is not proof of the operator's permanent location.

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 UTCBandRK4F S/NCounterpartCounterpart S/NMsgsCapture
08-24 07:04 20m +16 / - VK4BPK - / -16 6 ✓ Closing fragment
08-24 07:03 20m +18 / - VK5RJ - / - 2 Partial capture
08-24 06:56 20m +20 / - OK2CNI - / 0 2 ✓ Closing fragment
08-24 06:53 20m +16 / - VK4BPK - / - 3 Partial capture
08-24 06:49 20m +10 / - VK4BPK - / - 2 Partial capture
08-24 06:47 20m +12 / +1 EA2EDI -22 / -11 3 ✓ Full exchange observed
08-23 04:58 20m +2 / - K4A - / -20 2 ✓ Closing fragment
08-23 04:55 20m -8 / - K4A - / - 3 Partial capture
08-22 17:29 40m 0 / - R1BQW/M - / -10 3 Partial capture
08-22 17:22 40m - / +1 R4PFY -12 / - 2 ✓ Closing fragment
08-22 17:18 40m -18 / +6 EU6UE -2 / - 3 ✓ Closing observed
08-22 17:16 40m -17 / -8 RA2FGK -15 / - 4 Partial capture
08-22 17:14 40m -17 / - R1530IG - / -4 2 Partial capture
08-22 16:51 80m -17 / - RV9WB - / -3 3 ✓ Closing fragment
08-20 06:23 20m +18 / - VK4KTW - / - 3 Partial capture
08-20 06:20 20m +12 / - DL1R +4 / -3 7 Partial capture
08-20 06:18 20m +10 / - R6ADH - / -14 2 ✓ Closing fragment
08-20 06:17 20m +13 / - R1BOH - / -12 2 ✓ Closing fragment
08-20 06:16 20m +14 / - PD0DNA - / -18 2 ✓ Closing fragment
08-18 11:43 20m -3 / - DF3IAL - / -17 3 ✓ Closing fragment
08-18 11:40 20m +4 / - 2E0TSS - / -11 2 ✓ Closing fragment
08-18 11:35 20m -4 / - JM7GTK - / -4 2 ✓ Closing fragment
08-18 11:33 20m -4 / - 7N1PVD - / -16 3 Partial capture
08-18 11:31 20m -16 / - JR4DHK - / -14 2 ✓ Closing fragment
08-17 18:32 40m - / -6 7Z1XX -11 / - 2 ✓ Closing fragment
08-17 18:22 80m -18 / +2 RA3LCI -20 / -2 2 Partial capture
08-16 11:01 10m - / -21 DN9PMH -24 / - 2 Partial capture
08-16 10:57 10m -21 / +10 IK4LZH +1 / 0 5 ✓ Full exchange observed
08-16 10:46 10m - / -6 DN9OPA -10 / - 3 ✓ Closing fragment
08-16 10:24 20m -14 / -6 OM1AMT -10 / - 4 Partial capture
08-16 10:21 20m -4 / - CR5VP - / -21 2 Partial capture
08-16 10:20 20m -9 / -1 M9LCB -20 / -13 2 Partial capture
08-04 14:17 20m - / -15 TA2ED -15 / - 3 Partial capture
08-04 14:04 20m - / -10 ON5MGA -18 / - 13 Partial capture
08-04 14:02 20m - / -13 EA4IAQ -1 / - 2 ✓ Closing fragment
08-02 10:03 20m +4 / - HI8UD - / -13 3 Partial capture
07-31 06:56 20m -4 / -3 PD3LKN -12 / - 3 ✓ Closing observed
07-31 06:55 20m - / - DL1R +4 / - 8 Partial capture
07-30 12:16 20m +6 / - SP1ZMO - / - 2 ✓ Closing fragment
07-30 12:08 20m +10 / - ON6CQ - / -15 2 ✓ Closing fragment
07-30 12:06 20m +6 / - SP9DAT - / -1 2 ✓ Closing fragment
07-30 12:03 20m -4 / - LW5DIT - / - 2 Partial capture
07-28 11:11 20m -10 / -3 F4HSB -20 / -15 3 ✓ Full exchange observed
07-28 11:06 20m -11 / - <...> - / - 3 Partial capture
07-28 10:58 20m -17 / - UA6ANQ - / +2 3 ✓ Closing fragment
07-20 05:32 20m -13 / +3 KS4OT -14 / -8 5 ✓ Full exchange observed
07-19 11:25 20m -14 / - G8IXM - / -26 2 ✓ Closing fragment
07-19 11:22 20m -18 / - PD4RJ -24 / - 3 ✓ Closing observed
07-19 11:17 20m - / -8 IK5XCT -8 / - 5 Partial capture
07-19 11:16 20m -18 / - F4FSY - / - 7 Partial capture

Recent FT8 messages decoded at SO8OO

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

20m
UTC    dB Audio  Message
065845 +18  978  M0PFX RK4F -17
065915 +16  978  CQ RK4F LO23                          a1 (x3)
070300 +17  977  VK5RJ RK4F LO23 (x2)
070400 +20  977  VK4BPK RK4F LO23 (x6)
070800 +21  977  CQ RK4F LO23 (x2)
070915 -11 1619  RK4F S55A JN65
40m
UTC    dB Audio  Message
171800 -17 1583  CQ RK4F LO23
171830 -18 1583  EU6UE RK4F LO23
171845  -2 2589  RK4F EU6UE +06
171915 -15 1582  RK4F RA2FGK -08
171915  -3 2589  RK4F EU6UE RR73
172115  -4  836  RK4F RG3M 73
172215 -10 1358  RK4F R4PFY +01 (x2)
172430 -12 1583  YD5BAG RK4F -10
172615  -8  965  RW9H/M RK4F LO23
172900 -10 1927  GX4ABC RK4F LO23
172930  -2  384  R1BQW/M RK4F LO23 (x3)
173130  -3  687  UB3BDB RK4F LO23
80m
UTC    dB Audio  Message
203930  -6  878  LB9TH RK4F LO23
204030  -6  879  <DL70ESSEN> RK4F LO23 (x2)
204400 -24  879  BA5AN RK4F RR73 (x2)
204530  -8  879  F6BHK RK4F LO23 (x2)
182230 -20 2072  RK4F RA3LCI +02
182245 -18 2071  RA3LCI RK4F R-02
182415 -21 1628  CQ RK4F LO23 (x2)
164915 -19 1493  ZS6WAB RK4F LO23
165130 -16 2004  RV9WB RK4F LO23 (x3)
10m
UTC    dB Audio  Message
105700 -24 1851  IS0JHW RK4F LO23
105730 -22 1850  CQ RK4F LO23
105745  +0  488  RK4F IK4LZH JN54
105800 -18 1850  IK4LZH RK4F +00
105815  +2  488  RK4F IK4LZH R+10
105830 -24 1850  IK4LZH RK4F RR73
105845  +1  488  RK4F IK4LZH 73
105900 -20 1850  LZ3AN RK4F LO23
110030 -21 1850  CQ RK4F LO23
110145 -24 1851  RK4F DN9PMH -21
110200 -21 1850  R2FDU RK4F R-03
110315 -24 1852  RK4F DN9PMH -21
110330 -22 1850  CQ RK4F LO23
110815 -18 1849  R6TY RK4F R-08
111430 -18 1850  RK4F DL3NGN JN59
160m
UTC    dB Audio  Message
201700  -2  699  RA1AGX RK4F R+03
201715  +7  853  RK4F RA1AGX RR73
201730  -8  699  RA1AGX RK4F 73
201745 -13 1000  RK4F YO6HEM KN25
201815  +5 2596  RK4F SQ9DJQ -02
201830  -7  698  CQ RK4F LO23
201845  +3 2596  RK4F SQ9DJQ -02 (x2)
201915 -14 1232  RK4F IU5TUD -19 (x2)
201945  +3 2596  RK4F SQ9DJQ -02 (x5)

Decoder S/N history by band

Daily averages across messages associated with this profile as decoded at SO8OO.