RA3ZK — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: European Russia Most frequent locator attributed to this token: KO81

Receiver-side FT8 activity involving RA3ZK, decoded by SO8OO in southeastern Poland. 1,263 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 45 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-10-21.

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 1,263 FT8 messages attributed to RA3ZK as the transmitting token by decoded message structure across 45 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (32%), followed by 40 m (30%) and 10 m (15%). Most decodes (86%) fell within the six-hour window 14:00-20:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (87%); the estimated median was +2.4 dB.

Overview

1,263
Messages attributed
45
UTC dates decoded
144
Active 15-min windows
+2.4 dB
Estimated median S/N

Bands

160m · 156 80m · 402 40m · 383 20m · 136 10m · 186
First attributed message: 2026-06-10
Last attributed message: 2026-10-21 02:54 UTC

Observed FT8 message patterns

Attributed sample
1,263 messages
Active dates
45 UTC dates
Estimated median S/N
+2.4 dB
Estimated 10th-90th percentile
-10 to +12.4 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 41, moderate (-15 to -9 dB) 117, strong (≥ -8 dB) 1,105.

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 RA3ZK 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 RA3ZK

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
KO81 · 912 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,083 km (approx.)
Last such locator decoded
2026-10-21 02:53 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 UTCBandRA3ZK S/NCounterpartCounterpart S/NMsgsCapture
10-21 02:52 40m -6 / - Z34K - / -2 4 ✓ Closing fragment
10-21 02:51 40m -8 / - TN8GD - / -17 2 ✓ Closing fragment
10-15 16:16 160m -15 / - H49A - / - 3 Partial capture
10-15 16:05 160m -11 / - H49A - / - 8 Partial capture
10-11 17:48 40m +17 / - YC0AQN - / -7 3 ✓ Closing fragment
10-11 17:46 40m +16 / - 3D2HM - / -21 4 ✓ Closing fragment
10-11 17:44 40m +14 / - TA3XEE - / -16 2 ✓ Closing fragment
10-11 17:40 40m +6 / - JA4FQU - / -13 4 ✓ Closing fragment
10-11 17:30 40m +1 / - 9H1FL - / - 8 Partial capture
10-11 17:30 40m - / - RD3FY -1 / - 3 Partial capture
10-11 17:26 40m -2 / - JA8KAW - / -22 7 ✓ Closing fragment
10-11 17:22 40m +2 / - BG2EZM - / - 2 Partial capture
10-11 17:21 40m +11 / - JK2CET - / - 2 Partial capture
10-11 17:16 40m +9 / - YD4AWV - / -17 3 ✓ Closing fragment
10-11 17:14 40m +9 / - BD8BTP - / - 6 Partial capture
10-11 17:11 40m +12 / - BG4GNW - / -22 5 ✓ Closing fragment
10-11 17:09 40m +10 / - ZR6AGA - / - 2 Partial capture
10-11 17:06 40m +9 / - BG2EZM - / - 5 Partial capture
10-11 17:04 40m +14 / - BG0KD - / -11 3 ✓ Closing fragment
10-11 16:37 80m -8 / - EY8BL - / -12 11 ✓ Closing fragment
10-11 15:35 80m -5 / - R8PG - / -9 5 ✓ Closing fragment
10-11 15:29 80m +1 / - JF0JYR - / -20 5 ✓ Closing fragment
10-11 15:27 80m 0 / - 7M2PDT - / -19 4 ✓ Closing fragment
10-11 15:22 80m -2 / - JH6ETS - / -21 3 ✓ Closing fragment
10-11 15:19 80m -12 / - VU2GRM - / - 4 Partial capture
10-10 18:36 80m -10 / - H49A - / - 4 Partial capture
10-09 18:11 40m +7 / - VK3AMP - / - 8 Partial capture
10-09 18:07 40m +7 / - JQ7CLL - / - 2 Partial capture
10-09 18:04 40m +4 / - JA4WLF - / -16 5 ✓ Closing fragment
10-09 17:57 40m +6 / - 3B8FA - / -19 7 Partial capture
10-09 17:56 40m +8 / - YC2ULK - / - 2 Partial capture
10-09 17:55 40m +6 / - BG5JKZ - / -16 2 ✓ Closing fragment
10-09 17:54 40m +8 / - JK1SBP - / - 2 Partial capture
10-09 17:50 40m +19 / - BA8BLK - / -24 5 Partial capture
10-09 17:48 40m +14 / - JH3IVO - / -16 3 ✓ Closing fragment
10-09 17:47 40m - / -10 RC3D -4 / - 5 Partial capture
10-09 17:46 40m +15 / - EA8BIA - / - 3 Partial capture
10-09 17:44 40m +14 / - YD1EQN - / - 3 Partial capture
10-09 17:42 40m +12 / - BD4VNB - / -19 4 ✓ Closing fragment
10-09 17:40 40m +14 / - VR2VOG - / -19 4 ✓ Closing fragment
10-09 17:39 40m +14 / - BA6IM - / -23 2 ✓ Closing fragment
10-09 17:38 40m +8 / - BD6KDG - / -16 2 ✓ Closing fragment
10-09 17:37 40m +13 / - DS2MGT - / -13 2 ✓ Closing fragment
10-09 17:36 40m +9 / - VR2VDD - / -21 3 ✓ Closing fragment
10-09 17:34 40m +8 / - BA4IAW - / -11 3 ✓ Closing fragment
10-09 17:31 40m +15 / - VK3AGW - / -17 4 ✓ Closing fragment
10-09 17:30 40m +15 / - 3B9FR - / -11 3 ✓ Closing fragment
10-09 17:29 40m +3 / - BG0KE - / -15 3 ✓ Closing fragment
10-09 17:27 40m +3 / - BD8FWI - / -13 3 ✓ Closing fragment
10-09 17:26 40m +8 / - IS0JHQ - / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

10m 
UTC    dB Audio  Message
114615  -4  428  RA3ZK EA7AKL -15 (x2)
131830 -19 2080  RA3ZK 5Z4RS +12
40m 
UTC    dB Audio  Message
174515 +15 2789  TA3XEE RA3ZK RR73
174645 +16 2789  3D2HM RA3ZK KO81 (x4)
174845 +15 2789  YC0AQN RA3ZK KO81 (x3)
175000  +3 2778  RA3ZK R6DJR +00
025115  -6 2671  TN8GD RA3ZK R-17 (x2)
025245  -7 2670  Z34K RA3ZK KO81 (x4)
160m 
UTC    dB Audio  Message
180015  -9 2641  SV2JU RA3ZK R-20 (x3)
160545  -8 2794  H49A RA3ZK KO81 (x12)
80m 
UTC    dB Audio  Message
153830  +1  631  R8PG RA3ZK 73
163700  -9  666  EY8BL RA3ZK KO81 (x11)
164345  -9 2015  RA3ZK RA1QCX KP80
164415  -2 1614  UN1EAU RA3ZK KO81
164900 -10 2135  RA3ZK RA6ATZ KN96
20m 
UTC    dB Audio  Message
044200  -9 2593  AD9GE RA3ZK KO81
044215  +3 2074  RA3ZK RZ6CO -02
044230  +1 2593  AD9GE RA3ZK KO81
044500 +12 2921  KA2H RA3ZK KO81
044600  +8 2921  W5THT RA3ZK KO81 (x3)
182145 -16 1276  RA3ZK K7ACZ -08
182245  +9 1679  RA3ZK DL3MIB JN57 (x7)

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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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