4Z5NN — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving 4Z5NN, decoded by SO8OO in southeastern Poland. 389 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, across 11 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-09-17.
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 389 FT8 messages attributed to 4Z5NN as the transmitting token by decoded message structure across 11 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (80%), followed by 60 m (12%) and 80 m (7%). Several six-hour UTC windows tied for the largest share (72%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.
Overview
Bands
Last attributed message: 2026-09-17 19:00 UTC
Observed FT8 message patterns
- Attributed sample
- 389 messages
- Active dates
- 11 UTC dates
- Estimated median S/N
- -11 dB
- Estimated 10th-90th percentile
- -19 to -2 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 81, moderate (-15 to -9 dB) 171, strong (≥ -8 dB) 137.
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 4Z5NN 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 4Z5NN
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
- KM71 · 257 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 2,325 km (approx.)
- Last such locator decoded
- 2026-09-17 19:00 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 | 4Z5NN S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 09-21 05:48 | 40m | - / -17 | EA2KV | -14 / - | 2 | Partial capture |
| 09-21 05:46 | 40m | - / -4 | IU8DON | -14 / - | 2 | Partial capture |
| 09-21 05:07 | 40m | - / -17 | CR7BRV | -6 / - | 6 | ✓ Closing fragment |
| 09-21 05:07 | 40m | - / -23 | EA7GUL | -14 / - | 11 | ✓ Closing fragment |
| 09-21 05:06 | 40m | - / -15 | RW3ZC | -4 / - | 2 | Partial capture |
| 09-17 18:58 | 60m | - / - | DL1MST | -4 / - | 2 | Partial capture |
| 09-17 18:57 | 60m | - / -5 | DL1KYF/P | -8 / - | 2 | Partial capture |
| 09-17 18:55 | 60m | -17 / -16 | DK1XAM | -6 / -19 | 4 | ✓ Full exchange observed |
| 09-17 18:54 | 60m | - / - | OM5JG | -2 / - | 3 | Partial capture |
| 09-17 18:53 | 60m | -21 / -15 | IK4CBO | -9 / -11 | 4 | ✓ Full exchange observed |
| 09-17 18:51 | 60m | - / - | F5LMJ | -21 / - | 3 | Partial capture |
| 09-17 18:47 | 60m | - / -16 | SP4WRI | -16 / - | 7 | ✓ Closing fragment |
| 09-17 18:47 | 60m | -21 / -9 | OI5AY | +1 / -14 | 5 | ✓ Full exchange observed |
| 09-17 18:47 | 60m | -23 / -10 | OM5ZU | +9 / - | 4 | ✓ Closing observed |
| 09-17 18:42 | 60m | -22 / - | OI5AY | - / - | 3 | Partial capture |
| 09-17 18:42 | 60m | - / - | SM6CWP | -14 / - | 2 | Partial capture |
| 09-17 18:38 | 60m | -20 / -16 | IU4FJI | -3 / -15 | 7 | ✓ Full exchange observed |
| 09-17 18:36 | 60m | - / - | OH7VV | -22 / - | 2 | Partial capture |
| 09-17 18:34 | 60m | - / -13 | DK1XAM | -6 / - | 5 | Partial capture |
| 09-17 18:32 | 60m | - / -15 | IK2BDR | -17 / - | 3 | Partial capture |
| 09-17 18:31 | 60m | -20 / -9 | US2YW | +4 / -8 | 6 | ✓ Full exchange observed |
| 09-17 18:28 | 60m | - / - | OZ/DG4BRT | -12 / - | 3 | Partial capture |
| 09-17 18:28 | 60m | -20 / -15 | YO3HEY | -1 / -15 | 7 | ✓ Full exchange observed |
| 09-17 18:28 | 60m | -17 / -7 | YT2ZE | +1 / -11 | 4 | ✓ Full exchange observed |
| 09-17 16:23 | 80m | - / - | R6ZEJ | -19 / - | 3 | Partial capture |
| 09-17 16:11 | 80m | - / - | R6ZEJ | +8 / - | 2 | Partial capture |
| 09-16 17:13 | 80m | - / - | F4FRC | -16 / - | 2 | Partial capture |
| 09-16 16:58 | 80m | -7 / -4 | IT9KSS | -1 / - | 6 | ✓ Closing observed |
| 09-16 16:57 | 80m | - / -11 | IQ4JO | +1 / - | 3 | ✓ Closing fragment |
| 09-16 16:56 | 80m | - / -25 | DK9WI | +7 / - | 7 | Partial capture |
| 09-16 16:56 | 80m | - / -18 | IK5NQI | -10 / - | 4 | Partial capture |
| 09-16 16:55 | 80m | - / - | RD9M/3 | -12 / - | 2 | Partial capture |
| 09-16 16:54 | 80m | - / -16 | LY1DY | +16 / - | 6 | ✓ Closing fragment |
| 09-16 16:51 | 80m | -8 / -2 | IW8FBM | -10 / -17 | 4 | ✓ Full exchange observed |
| 09-16 16:49 | 80m | - / -20 | DK9WI | +6 / - | 3 | Partial capture |
| 09-16 16:47 | 80m | -14 / - | IQ4JO | -6 / -18 | 2 | Partial capture |
| 09-16 16:47 | 80m | -14 / - | LY1DY | +14 / -20 | 3 | Partial capture |
| 09-16 16:19 | 80m | -9 / -24 | RK6OQ | +1 / - | 4 | ✓ Closing observed |
| 09-12 04:49 | 40m | - / - | RN3ZBX | +2 / - | 2 | Partial capture |
| 09-12 04:42 | 40m | - / -15 | IW1FZR | +4 / - | 4 | ✓ Closing fragment |
| 09-12 04:32 | 40m | -11 / +1 | LZ2INP | +4 / -3 | 4 | ✓ Full exchange observed |
| 09-12 04:26 | 40m | - / -11 | YL2EA | -7 / - | 3 | ✓ Closing fragment |
| 09-12 04:23 | 40m | - / - | EA3IZF | -11 / - | 5 | Partial capture |
| 09-12 04:14 | 40m | - / - | R2ZCA | -3 / - | 2 | Partial capture |
| 09-12 04:09 | 40m | -8 / -7 | RZ6L | +12 / -3 | 5 | ✓ Full exchange observed |
| 09-12 04:06 | 40m | -11 / - | HI8JCD | -16 / -14 | 3 | ✓ Closing observed |
| 09-12 03:55 | 40m | -13 / - | EP2AES | - / -16 | 2 | Partial capture |
| 09-12 03:51 | 40m | -10 / -12 | UW5ESX | +1 / -9 | 7 | ✓ Full exchange observed |
| 09-12 03:24 | 40m | -10 / - | HB9ZHK | - / -16 | 3 | Partial capture |
| 09-12 03:17 | 40m | -1 / - | YO4BEW | - / -14 | 4 | Partial capture |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 050830 -7 833 4Z5NN CR7BRV R-17 050900 -13 1533 4Z5NN EA7GUL IM86 050900 -6 833 4Z5NN CR7BRV R-17 050930 -18 1533 4Z5NN EA7GUL IM86 050930 -5 833 4Z5NN CR7BRV 73 051000 -14 1533 4Z5NN EA7GUL IM86 (x5) 054630 -15 1007 4Z5NN IU8DON JM78 (x2) 054830 +0 1007 4Z5NN EU6KA KO55 054830 -12 2363 4Z5NN EA2KV IN91 (x2)
UTC dB Audio Message 185500 -7 725 4Z5NN DK1XAM JO42 185515 -3 1202 4Z5NN OM5JG JN98 185515 -17 1532 DK1XAM 4Z5NN -19 185530 -7 725 4Z5NN DK1XAM R-16 (x2) 185715 -13 1533 CQ 4Z5NN KM71 185730 -9 582 4Z5NN DL1KYF/P -05 185745 -15 1533 CQ 4Z5NN KM71 185800 -7 582 4Z5NN DL1KYF/P -01 185815 -21 1533 CQ 4Z5NN KM71 185830 -2 393 4Z5NN DL1MST JO30 185845 -14 1533 CQ 4Z5NN KM71 185900 -6 393 4Z5NN DL1MST JO30 185915 -19 1533 CQ 4Z5NN KM71 190015 -24 1533 M1FJG 4Z5NN KM71
UTC dB Audio Message 165930 +3 1051 4Z5NN IT9KSS JM68 165930 +9 2034 4Z5NN DK9WI -19 170000 -4 1051 4Z5NN IT9KSS R-04 170015 -7 556 IT9KSS 4Z5NN RR73 170030 -3 1051 4Z5NN IT9KSS 73 170030 +11 1984 4Z5NN DK9WI -19 171330 -7 293 4Z5NN IK5NQI -18 171330 -15 1311 4Z5NN F4FRC JN25 (x2) 161130 +8 600 4Z5NN R6ZEJ KN98 (x6)
UTC dB Audio Message 152130 +1 2689 4Z5NN DO7BE JO64 (x3) 162100 -6 2657 4Z5NN DN9OPA 73 120600 -2 445 4Z5NN F4LNM JN09 (x3)
UTC dB Audio Message 163100 -4 2022 4Z5NN SP3JHY JO71 163215 -23 1883 CQ 4Z5NN KM71 a1 163230 -7 2722 4Z5NN DL1R JN58 163300 -6 2021 4Z5NN SP3JHY JO71 163300 -8 2722 4Z5NN DL1R JN58 163330 -9 2022 4Z5NN SP3JHY JO71 163330 -8 2722 4Z5NN DL1R JN58 163400 -4 2022 4Z5NN SP3JHY JO71 163400 -7 2722 4Z5NN DL1R JN58 163430 -15 2021 4Z5NN SP3JHY JO71 163430 -2 2722 4Z5NN DL1R JN58 163530 -2 2021 4Z5NN SP3JHY JO71 163530 -3 2721 4Z5NN DL1R JN58 (x3)
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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