RA3ZDU — reception at SO8OO
Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.
FT8 activity
Receiver-side FT8 activity involving RA3ZDU, decoded by SO8OO in southeastern Poland. 4,798 FT8 messages attributed to this token as transmitter, on 160m, 80m, 40m, 20m, 10m, across 80 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-11-06.
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 4,798 FT8 messages attributed to RA3ZDU as the transmitting token by decoded message structure across 80 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (33%), followed by 20 m (33%) and 80 m (21%). The busiest six-hour window was 23:00-05:00 UTC, containing 45% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -7.6 dB.
Overview
Bands
Last attributed message: 2026-11-06 03:59 UTC
Observed FT8 message patterns
- Attributed sample
- 4,798 messages
- Active dates
- 80 UTC dates
- Estimated median S/N
- -7.6 dB
- Estimated 10th-90th percentile
- -18 to +4 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 801, moderate (-15 to -9 dB) 1,395, strong (≥ -8 dB) 2,602.
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 RA3ZDU 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 RA3ZDU
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
- KO90 · 3,210 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 1,223 km (approx.)
- Last such locator decoded
- 2026-11-06 03:59 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 UTC | Band | RA3ZDU S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 11-06 03:44 | 40m | -14 / - | EI4GAB | - / - | 2 | Partial capture |
| 11-06 03:42 | 40m | -14 / - | SP4FEU | - / +1 | 2 | ✓ Closing fragment |
| 11-06 03:39 | 40m | -9 / - | PR7EG | - / - | 2 | Partial capture |
| 11-06 01:27 | 40m | - / -3 | IU8RFW | -16 / - | 2 | Partial capture |
| 11-06 01:05 | 40m | - / 0 | EA1CUI | -14 / - | 2 | ✓ Closing fragment |
| 11-06 00:52 | 40m | -18 / - | W3FOX | - / -12 | 2 | ✓ Closing fragment |
| 11-06 00:34 | 80m | -6 / -18 | UA2FFD | -14 / -14 | 5 | ✓ Full exchange observed |
| 11-05 21:26 | 80m | - / -16 | OK1UOZ | +7 / - | 4 | ✓ Closing fragment |
| 11-05 21:19 | 80m | -8 / - | SP5HIH | - / - | 2 | Partial capture |
| 11-05 21:07 | 80m | - / -20 | ON6LEO | 0 / - | 2 | Partial capture |
| 11-05 21:05 | 80m | - / -9 | SP8HDC | -1 / - | 5 | Partial capture |
| 11-05 18:09 | 80m | -10 / +2 | UA3ZSI | -4 / - | 4 | ✓ Closing observed |
| 11-05 18:07 | 80m | -2 / - | RD0L | - / - | 5 | Partial capture |
| 11-05 18:03 | 80m | -2 / -14 | SQ2JYJ | +6 / -5 | 7 | ✓ Full exchange observed |
| 11-05 17:58 | 80m | -1 / -13 | SV0LS | +4 / -8 | 8 | ✓ Full exchange observed |
| 11-05 17:56 | 80m | -2 / - | SO5A | - / - | 2 | Partial capture |
| 11-05 17:46 | 80m | - / 0 | RW3DC | -2 / - | 2 | ✓ Closing fragment |
| 11-05 17:39 | 80m | -8 / -7 | OM7OM | -1 / -18 | 3 | ✓ Full exchange observed |
| 11-05 17:36 | 80m | -8 / -6 | OK2IT | +10 / -8 | 4 | ✓ Full exchange observed |
| 11-05 17:33 | 80m | -3 / -1 | RG7M | +2 / - | 3 | ✓ Closing observed |
| 11-05 17:31 | 80m | -8 / +8 | SP4AZN | -4 / -1 | 5 | ✓ Full exchange observed |
| 11-05 17:30 | 80m | -11 / -9 | SN31ROT | +9 / -4 | 3 | Partial capture |
| 11-05 17:27 | 80m | - / -7 | RC9WC | -4 / - | 2 | ✓ Closing fragment |
| 11-05 17:26 | 80m | 0 / -16 | UB8FDN | -8 / -7 | 5 | ✓ Full exchange observed |
| 11-05 17:24 | 80m | -10 / -15 | IK6QOP | +2 / -4 | 5 | ✓ Full exchange observed |
| 11-05 17:22 | 80m | -1 / - | R3IDH | - / -3 | 3 | ✓ Closing fragment |
| 11-05 17:21 | 80m | -4 / - | EA2BFM | - / - | 2 | Partial capture |
| 11-05 17:18 | 80m | +4 / -20 | R3DGH | -11 / -9 | 5 | ✓ Full exchange observed |
| 11-05 17:09 | 40m | -7 / - | R4PFY | - / -12 | 2 | ✓ Closing fragment |
| 11-05 17:06 | 40m | -1 / - | 9A3EYA | - / 0 | 5 | ✓ Closing fragment |
| 11-05 17:04 | 40m | -4 / -7 | R3DCA | -14 / -2 | 6 | ✓ Full exchange observed |
| 11-05 17:00 | 40m | -2 / - | RL1I/P | - / +1 | 3 | Partial capture |
| 11-04 04:41 | 40m | -4 / - | K1JAK | - / -12 | 4 | ✓ Closing fragment |
| 11-04 04:38 | 40m | 0 / - | RK6OU | - / - | 5 | Partial capture |
| 11-04 04:36 | 40m | -6 / - | OE6OCG | - / -2 | 3 | ✓ Closing fragment |
| 11-04 04:32 | 40m | -3 / - | TC5ATA | - / -11 | 6 | Partial capture |
| 11-04 04:31 | 40m | +2 / - | RK6OU | - / - | 2 | Partial capture |
| 11-04 02:37 | 40m | +10 / - | WP4SZA | - / -15 | 3 | ✓ Closing fragment |
| 11-04 01:32 | 40m | - / -17 | WA1HXH | -11 / - | 3 | Partial capture |
| 11-04 01:03 | 40m | - / -16 | RA8CO | -18 / - | 2 | ✓ Closing fragment |
| 11-04 01:01 | 40m | - / -10 | G4WFQ | +6 / - | 2 | ✓ Closing fragment |
| 11-04 00:59 | 40m | - / +1 | IK1MJL | +6 / - | 2 | Partial capture |
| 11-04 00:45 | 40m | - / -3 | M9WDW | -10 / - | 2 | ✓ Closing fragment |
| 11-04 00:28 | 40m | - / -4 | F1PBZ | -1 / - | 4 | ✓ Closing fragment |
| 11-04 00:13 | 40m | - / -6 | IK4UOF | -14 / - | 2 | ✓ Closing fragment |
| 11-04 00:07 | 40m | - / -13 | G5NIK | -14 / - | 2 | ✓ Closing fragment |
| 11-03 23:49 | 40m | - / -2 | AA3B | -8 / - | 2 | Partial capture |
| 11-03 23:32 | 80m | +4 / +9 | GM4GZW | -4 / -4 | 5 | ✓ Full exchange observed |
| 11-03 23:30 | 80m | +12 / -6 | SP1LON | -10 / -8 | 5 | ✓ Full exchange observed |
| 11-03 23:29 | 80m | +6 / - | SP9NVY | +8 / - | 3 | ✓ Closing observed |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 012730 -16 1312 RA3ZDU IU8RFW R-03 013730 -6 554 RA3ZDU VP2MCV -14 021915 -9 900 RA3ZDU KI8JP RR73 033930 -10 507 PR7EG RA3ZDU KO90 (x2) 034200 -15 899 SP4FEU RA3ZDU R+01 (x2) 034400 -14 741 EI4GAB RA3ZDU KO90 (x2) 034600 -11 355 CQ RA3ZDU KO90 034730 -20 2209 UA9C RA3ZDU KO90 035515 -15 2275 Z34K RA3ZDU KO90 035815 -8 2975 IK1YED RA3ZDU KO90 035915 -5 2975 CQ RA3ZDU KO90 (x2)
UTC dB Audio Message 210800 -5 2243 RA3ZDU SP8HDC R-09 211945 -12 2666 SP5HIH RA3ZDU KO90 (x2) 212415 -16 255 EA7TR RA3ZDU KO90 212600 +7 2480 RA3ZDU OK1UOZ JO70 (x4) 003445 -14 1660 RA3ZDU UA2FFD -18 003500 -6 1660 UA2FFD RA3ZDU R-14 003515 -10 1660 RA3ZDU UA2FFD RRR 003530 -6 1661 UA2FFD RA3ZDU 73 003545 -17 1660 RA3ZDU UA2FFD 73 003630 -5 1920 SP9TBT/5 RA3ZDU KO90 003700 -3 1920 CQ RA3ZDU KO90
UTC dB Audio Message 221715 -16 1571 UN8DSW RA3ZDU KO90 (x5) 222115 -13 2271 OG5O RA3ZDU KO90 (x3) 222315 -12 1571 UN8DSW RA3ZDU KO90 (x6) 035830 -19 1847 DL6KAI RA3ZDU KO90
UTC dB Audio Message 135200 -3 1645 RA3ZDU 4Z5AV -12 (x2)
UTC dB Audio Message 084630 +5 2803 OH/DG2SBL RA3ZDU KO90 (x3) 084845 -7 2803 RA3ZDU OH/DG2SBL +20 084900 +5 2803 OH/DG2SBL RA3ZDU R+01 085445 +1 2167 PD5URK RA3ZDU KO90 (x4) 085645 +8 2636 DL4DD RA3ZDU KO90 (x2) 085745 +6 2257 HA/G4RCR RA3ZDU KO90 085830 -8 1986 RA3ZDU F4IOH/P +10 085945 +1 896 II4KEMP RA3ZDU KO90 090115 +5 2354 IK0XBU/P RA3ZDU R+03
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.
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