YO4FZV — FT8 activity observed at SO8OO
Receiver-side FT8 activity involving YO4FZV, decoded by SO8OO in southeastern Poland. 1,978 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 63 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-10-07.
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 1,978 FT8 messages attributed to YO4FZV as the transmitting token by decoded message structure across 63 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (67%), followed by 20 m (21%) and 10 m (12%). Most decodes (50%) fell within the six-hour window 17:00-23:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -7 dB.
Overview
Bands
Last attributed message: 2026-10-07 20:03 UTC
Observed FT8 message patterns
- Attributed sample
- 1,978 messages
- Active dates
- 63 UTC dates
- Estimated median S/N
- -7 dB
- Estimated 10th-90th percentile
- -17 to +5 dB
- Recurring-pattern threshold
- Met
SO8OO display ranges among successful decodes: weak (≤ -16 dB) 329, moderate (-15 to -9 dB) 545, strong (≥ -8 dB) 1,104.
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 YO4FZV 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 YO4FZV
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
- KN44 · 1,357 decoded messages
- SO8OO receiver locator
- KN09VW
- Locator-centre separation
- 813 km (approx.)
- Last such locator decoded
- 2026-10-07 20:03 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 | YO4FZV S/N | Counterpart | Counterpart S/N | Msgs | Capture |
|---|---|---|---|---|---|---|
| 10-07 20:02 | 40m | -14 / - | VR2VDD | - / - | 2 | Partial capture |
| 10-07 17:31 | 40m | +4 / - | VR2VDD | - / - | 10 | Partial capture |
| 10-07 17:28 | 40m | +3 / - | TA3XEE | - / -9 | 3 | ✓ Closing fragment |
| 10-07 17:25 | 40m | 0 / -7 | YL2TM | +2 / - | 5 | Partial capture |
| 10-07 17:20 | 40m | +3 / - | A41KB | - / - | 5 | Partial capture |
| 10-07 17:16 | 40m | -2 / - | UN7PHV | - / -19 | 4 | Partial capture |
| 10-06 16:30 | 40m | -5 / - | M0IEP | -10 / -16 | 3 | ✓ Closing observed |
| 10-06 16:24 | 40m | +4 / - | IK2TCV | - / -6 | 7 | Partial capture |
| 10-06 16:22 | 40m | +2 / - | OK1AWC | - / 0 | 3 | ✓ Closing fragment |
| 10-05 21:48 | 40m | -11 / - | A71AH | - / -20 | 4 | ✓ Closing fragment |
| 10-05 21:40 | 40m | -9 / - | 5B4AMM | - / - | 2 | Partial capture |
| 10-05 21:37 | 40m | -10 / - | UN0GY | - / - | 6 | Partial capture |
| 10-05 21:34 | 40m | -14 / -9 | EA8DGI | -19 / -17 | 5 | ✓ Full exchange observed |
| 10-05 21:29 | 40m | -13 / - | VP8A | - / - | 6 | Partial capture |
| 10-05 21:09 | 40m | -4 / - | C5R | - / - | 6 | ✓ Closing fragment |
| 10-05 20:57 | 40m | -3 / - | C5R | - / -12 | 10 | Partial capture |
| 10-05 20:17 | 40m | -3 / - | IQ8DO | - / -18 | 3 | Partial capture |
| 10-05 20:14 | 40m | -8 / - | 7Z1BQ | - / - | 3 | Partial capture |
| 10-05 20:03 | 40m | -12 / - | V51WH | - / -8 | 2 | ✓ Closing fragment |
| 10-05 20:01 | 40m | -9 / - | YL2NX | - / -3 | 2 | Partial capture |
| 10-03 22:50 | 40m | -3 / -12 | C31CT | -8 / -9 | 5 | ✓ Full exchange observed |
| 10-03 22:42 | 40m | -7 / -5 | V47YA | -5 / - | 13 | ✓ Closing observed |
| 10-03 22:33 | 40m | -3 / -16 | IS0IIG | -6 / -4 | 7 | Partial capture |
| 10-03 22:32 | 40m | -7 / - | C31CT | - / - | 3 | Partial capture |
| 10-03 22:27 | 40m | -6 / - | F1PBZ | - / -6 | 2 | ✓ Closing fragment |
| 10-03 22:25 | 40m | -4 / -8 | M0SCK | -14 / -8 | 5 | ✓ Full exchange observed |
| 10-03 22:22 | 40m | -7 / - | OK1ZJK | - / - | 2 | Partial capture |
| 10-03 22:19 | 40m | -5 / - | 7Z1IS | - / - | 4 | Partial capture |
| 10-03 22:07 | 40m | -7 / -8 | CS8ABF | -15 / -12 | 5 | ✓ Full exchange observed |
| 10-03 22:04 | 40m | -7 / - | UN7BDZ | - / -7 | 3 | ✓ Closing fragment |
| 10-03 22:03 | 40m | -4 / - | RA9ACA | - / -12 | 2 | ✓ Closing fragment |
| 10-03 22:01 | 40m | -10 / - | CN8NY | -18 / -9 | 4 | ✓ Closing observed |
| 10-03 22:00 | 40m | -12 / - | OM1AGE | - / -19 | 2 | ✓ Closing fragment |
| 10-03 21:58 | 40m | -9 / - | 7Z1IS | - / - | 3 | Partial capture |
| 10-03 21:55 | 40m | -8 / - | EA6AJT | - / -14 | 5 | ✓ Closing fragment |
| 10-03 21:53 | 40m | -4 / - | 7Z1IS | - / - | 5 | Partial capture |
| 10-03 21:44 | 40m | -5 / - | 9H1SR | - / -18 | 3 | ✓ Closing fragment |
| 10-03 06:46 | 40m | -4 / - | DH5BM | - / - | 7 | Partial capture |
| 10-02 17:24 | 40m | -2 / - | 7Z1IS | - / - | 4 | Partial capture |
| 10-02 17:20 | 40m | -5 / - | JT1DN | - / - | 6 | Partial capture |
| 10-02 16:08 | 40m | +5 / - | VU2KPH | - / -22 | 3 | Partial capture |
| 10-02 16:06 | 40m | +2 / - | DL6EL | - / -14 | 4 | ✓ Closing fragment |
| 10-01 19:50 | 40m | -11 / -13 | IZ1HJU | -18 / -12 | 9 | Partial capture |
| 10-01 19:48 | 40m | -14 / - | LZ1ZF | - / - | 2 | Partial capture |
| 10-01 19:45 | 40m | -10 / - | OH6NIO | - / -12 | 3 | Partial capture |
| 10-01 19:40 | 40m | -9 / - | YC2BUZ | - / - | 3 | Partial capture |
| 10-01 19:39 | 40m | -8 / - | VK3LV | - / - | 2 | Partial capture |
| 10-01 19:37 | 40m | -10 / - | MI7RDK | - / - | 3 | Partial capture |
| 10-01 19:35 | 40m | -1 / - | G0RVY | - / - | 4 | Partial capture |
| 10-01 19:33 | 40m | -4 / - | 7Z1BM | - / -23 | 3 | ✓ Closing fragment |
Recent FT8 messages decoded at SO8OO
Frequency values are decoder audio offsets in hertz, not RF frequencies.
UTC dB Audio Message 172845 +2 1066 YO4FZV YL2TM -07 172900 +5 2294 TA3XEE YO4FZV R-09 (x2) 173100 -2 2294 VR2VDD YO4FZV KN44 (x12)
UTC dB Audio Message 080530 -7 2779 SV3AUW YO4FZV KN44 (x2) 083530 -20 1788 YO4FZV F5RRS R-19 (x2) 083900 -5 1998 YO4FZV IK2UCK JN45 (x3) 085745 -2 2240 YO4FZV ON5RZ JO21 (x4) 090445 -5 2643 YO4FZV F4IIJ -12 (x2) 091730 -14 976 YO4FZV IW4CYE -16 125600 -24 2171 YO4FZV IT9ZIR -01
UTC dB Audio Message 103045 +13 502 F4HSB YO4FZV -12 103130 -14 1746 YO4FZV F4HSB 73 103230 +6 502 OM7AMA YO4FZV KN44 (x8) 105200 -3 502 9A4AA YO4FZV KN44 (x2) 105245 -10 726 YO4FZV 9A4AA +06 105300 +0 502 9A4AA YO4FZV R-22 (x2)
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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