IU3VSZ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Italy Most frequent locator attributed to this token: JN55

Receiver-side FT8 activity involving IU3VSZ, decoded by SO8OO in southeastern Poland. 204 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 32 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-12.

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 204 FT8 messages attributed to IU3VSZ as the transmitting token by decoded message structure across 32 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (30%), followed by 40 m (27%) and 20 m (25%). Most decodes (78%) fell within the six-hour window 14:00-20:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11.2 dB.

Overview

204
Messages attributed
32
UTC dates decoded
62
Active 15-min windows
-11.2 dB
Estimated median S/N

Bands

80m · 61 40m · 56 20m · 52 10m · 35
First attributed message: 2026-06-06
Last attributed message: 2026-09-12 17:42 UTC

Observed FT8 message patterns

Attributed sample
204 messages
Active dates
32 UTC dates
Estimated median S/N
-11.2 dB
Estimated 10th-90th percentile
-20 to +1 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 63, moderate (-15 to -9 dB) 63, strong (≥ -8 dB) 78.

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 IU3VSZ 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 IU3VSZ

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
JN55 · 133 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
945 km (approx.)
Last such locator decoded
2026-09-12 17:42 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 UTCBandIU3VSZ S/NCounterpartCounterpart S/NMsgsCapture
09-10 15:33 40m -9 / +10 PD1RGW -18 / -2 5 ✓ Full exchange observed
09-10 15:32 40m -8 / - DL6UXL -21 / 0 3 ✓ Full exchange observed
09-10 15:27 40m -2 / - IU8TIT - / -5 2 Partial capture
09-10 15:25 40m -5 / - PD1AQL +1 / -8 4 ✓ Closing observed
09-09 19:37 80m -3 / - EA3HMM - / -12 2 Partial capture
09-09 19:35 80m -1 / -17 DO9FSE -24 / - 5 ✓ Closing observed
09-09 19:33 80m - / -1 HA7TM +17 / - 5 ✓ Closing fragment
09-09 19:32 80m - / - UA4FKT +8 / - 2 Partial capture
09-09 19:30 80m -11 / -7 GI6HKE -14 / -16 5 ✓ Full exchange observed
09-09 18:22 80m -8 / - R3MDJ - / - 2 Partial capture
09-08 18:32 40m -4 / - OE5BET - / - 2 ✓ Closing fragment
09-07 12:21 40m -17 / -3 DL6KVB -7 / - 4 ✓ Closing observed
09-07 12:20 40m -16 / - OE3FVU -9 / -2 3 ✓ Closing observed
08-23 16:23 40m -6 / - VJ6X - / - 5 Partial capture
08-22 11:17 10m -18 / - LY2BBF - / - 2 Partial capture
08-21 19:27 80m -15 / -21 JG3TRB -13 / -13 7 Partial capture
08-21 18:31 80m -8 / - R9SAP - / -14 2 Partial capture
08-21 18:29 80m -20 / - HB3YYA - / -4 3 ✓ Closing fragment
08-21 18:18 40m -2 / - F4GYM/P - / -17 2 ✓ Closing fragment
08-21 18:16 40m +2 / - ZS2PA - / - 2 Partial capture
08-21 18:12 40m +4 / +7 DL6CMF -10 / -3 5 ✓ Full exchange observed
08-21 18:11 40m -2 / - SV1EKI - / -6 4 ✓ Closing fragment
08-21 18:10 40m - / - F1IQH -14 / - 3 Partial capture
08-21 18:05 40m -4 / - OH8SR -9 / - 4 ✓ Closing observed
08-21 17:42 10m -23 / - LU9ET - / - 3 Partial capture
08-16 06:28 20m -21 / - HK3W - / - 2 Partial capture
08-16 06:15 20m -22 / - HK3W - / - 3 Partial capture
08-16 05:59 20m -16 / - V31DL - / -2 3 ✓ Closing fragment
08-15 19:54 80m -8 / - HA7FT - / - 3 Partial capture
08-15 19:48 80m -11 / -2 DK0ACI -14 / -6 4 ✓ Full exchange observed
08-15 19:42 40m -5 / - 7Z1XX - / - 2 Partial capture
08-15 19:22 20m -20 / - XU7O - / -13 4 Partial capture
08-10 18:07 20m -14 / - <...> - / - 2 Partial capture
08-09 15:12 10m -17 / - UX0KR - / -12 3 ✓ Closing fragment
08-09 15:11 10m -11 / - S54E - / -10 2 Partial capture
08-09 06:20 20m -20 / - S55X - / -26 2 Partial capture
08-06 07:06 20m -11 / - KE2UK - / - 2 Partial capture
08-02 19:11 80m -10 / - OH5LF - / - 2 Partial capture
08-02 19:09 80m -14 / - YB7IBR - / -26 4 Partial capture
08-02 19:07 80m +2 / - SP5MIG/6 - / -11 2 Partial capture
08-02 19:04 80m - / -8 EA3AKY -14 / - 2 Partial capture
08-02 19:04 80m - / - HA7TM +10 / - 3 Partial capture
08-02 19:04 80m - / - UA4FKT +12 / - 4 Partial capture
08-02 19:01 80m -3 / -19 RA9SJG -10 / -16 7 ✓ Full exchange observed
07-28 18:54 80m +4 / - R9JX - / - 2 Partial capture
07-26 07:26 20m -18 / - HK3W - / - 2 Partial capture
07-24 14:56 10m -12 / - LW1DZ - / - 4 Partial capture
07-24 14:51 10m -12 / - S56GD - / - 2 Partial capture
07-24 14:49 10m -16 / - TK5K - / - 2 Partial capture
07-14 09:53 20m -18 / 0 OK1VM -14 / - 3 ✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
193300 -19  865  CQ IU3VSZ JN55
193315 +25  866  IU3VSZ HA7TM JN97 (x5)
193515 -24  866  IU3VSZ DO9FSE JO30 (x4)
193700  -1  612  DO9FSE IU3VSZ 73
193730  -6  612  EA3HMM IU3VSZ -12 (x2)
174145  -9 1359  RN2F IU3VSZ JN55
174245  -9 1359  <LZ936BA> IU3VSZ JN55
40m 
UTC    dB Audio  Message
152530  -6 1283  PD1AQL IU3VSZ JN55 (x2)
152615  +1 2786  IU3VSZ PD1AQL RR73
152630  +1 1283  PD1AQL IU3VSZ 73
152745  -1 1283  IU8TIT IU3VSZ JN55 (x2)
152945  +2 1283  DL6UXL IU3VSZ JN55
153200 -21 1998  IU3VSZ DL6UXL +20
153215 -10 1283  DL6UXL IU3VSZ R+00 (x2)
153315 -11 1283  PD1RGW IU3VSZ JN55
153330 -21 1282  IU3VSZ PD1RGW +10
153345  -8 1283  PD1RGW IU3VSZ R-02
153400 -16 1283  IU3VSZ PD1RGW RR73
153415  -9 1283  PD1RGW IU3VSZ 73
10m 
UTC    dB Audio  Message
145615 -12 1413  LW1DZ IU3VSZ JN55 (x4)
145945 -16 1864  OZ5VO IU3VSZ JN55
151115 -11 2170  S54E IU3VSZ JN55 (x2)
151245 -19 2170  UX0KR IU3VSZ -12 (x3)
174200 -22 1415  LU9ET IU3VSZ JN55 (x3)
111730 -17 1485  LY2BBF IU3VSZ JN55 (x2)
20m 
UTC    dB Audio  Message
055945 -21 2135  V31DL IU3VSZ JN55 (x3)
060930 -15  725  HK3W IU3VSZ JN55
061400 -18 1384  VK2JJM IU3VSZ JN55
061500 -20 1384  HK3W IU3VSZ JN55 (x3)
062145 -12  625  LZ2VQ IU3VSZ R-08
062615 -17  930  <EY35D> IU3VSZ JN55
062715 -18 1703  OE/DL6CGU IU3VSZ JN55
062800 -21 1703  HK3W IU3VSZ JN55 (x2)
113545  -8  710  ZB2LGT IU3VSZ JN55
191215  -4 2226  WV2B IU3VSZ JN55

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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