F4ISZ — 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: France Most frequent locator attributed to this token: JN38

Receiver-side FT8 activity involving F4ISZ, decoded by SO8OO in southeastern Poland. 56 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, 10m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-07 and 2026-09-27.

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 56 FT8 messages attributed to F4ISZ as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (39%), followed by 20 m (29%) and 40 m (23%). The busiest six-hour window was 03:00-09:00 UTC, containing 45% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

56
Messages attributed
10
UTC dates decoded
20
Active 15-min windows
-12 dB
Estimated median S/N

Bands

80m · 22 40m · 13 20m · 16 10m · 5
First attributed message: 2026-06-07
Last attributed message: 2026-09-27 04:31 UTC

Observed FT8 message patterns

Attributed sample
56 messages
Active dates
10 UTC dates
Estimated median S/N
-12 dB
Estimated 10th-90th percentile
-19 to -7 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 15, moderate (-15 to -9 dB) 30, strong (≥ -8 dB) 11.

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 F4ISZ 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 F4ISZ

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
JN38 · 29 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,084 km (approx.)
Last such locator decoded
2026-09-27 04:31 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 UTCBandF4ISZ S/NCounterpartCounterpart S/NMsgsCapture
09-27 04:26 80m - / +5 DD4U -2 / - 2 ✓ Closing fragment
09-27 04:11 80m - / -15 DO2NM -11 / - 2 ✓ Closing fragment
09-27 04:09 80m -12 / +4 DO2JUF 0 / - 3 ✓ Closing observed
09-27 04:06 80m - / -6 EC3A -2 / - 3 Partial capture
09-27 04:05 80m -1 / -13 DO8JB +1 / -4 4 Partial capture
09-27 04:05 80m -10 / -18 UA6Q/M 0 / - 2 Partial capture
09-27 04:02 80m -8 / -2 DO1ID +16 / +3 6 ✓ Full exchange observed
09-27 03:59 80m -15 / -8 ON8DM +6 / 0 7 ✓ Full exchange observed
08-08 19:36 80m -19 / - EW8AAC - / - 2 Partial capture
08-08 19:06 20m -6 / - FG5FI -24 / -10 4 ✓ Closing observed
08-08 18:15 40m -17 / - F1LPT/P - / -3 3 ✓ Closing fragment
08-05 12:53 20m -18 / - SP6AXW - / -7 2 Partial capture
08-05 12:46 20m -13 / - SM2IEN - / -20 7 Partial capture
08-04 20:06 80m - / -10 DO7LIA +6 / - 2 ✓ Closing fragment
08-04 04:51 80m -10 / - VP2MAA - / - 3 Partial capture
08-03 20:31 80m -7 / -8 PA1PA +12 / +1 5 ✓ Full exchange observed
08-03 20:25 80m -9 / -21 <...> 0 / -1 2 Partial capture
08-01 04:56 40m - / -6 SP6JIU +4 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
040645  +1  934  F4ISZ DO8JB JO32
040700  -1  934  DO8JB F4ISZ -04
040715  +3  934  F4ISZ DO8JB R-13
040745  -2 2227  F4ISZ EC3A R-06 (x2)
040900 -12  934  DO2JUF F4ISZ JN38
040945  +3 2311  F4ISZ DO2JUF +04 (x2)
041130 -12 2129  F4ISZ DO2NM -15 (x2)
041515  +4  933  UA6Q/M F4ISZ JN38
041600 +13 2387  F4ISZ RR73; DL6UJ <...> +00
042600  -3 2046  F4ISZ DD4U +05 (x2)
043115  -4  935  DF5DP F4ISZ JN38
10m 
UTC    dB Audio  Message
080715 -15  733  SP2LNY F4ISZ 73
195130 -18 2175  CQ YO F4ISZ JN38
195730 -24 1834  KD4CM F4ISZ JN38
20m 
UTC    dB Audio  Message
124615 -11  897  SM2IEN F4ISZ JN38 (x7)
125315 -18 1540  SP6AXW F4ISZ -07 (x2)
131045  -8  565  VE9PHX F4ISZ JN38
190600  -7 1590  FG5FI F4ISZ JN38 (x3)
190745 -24 1590  F4ISZ FG5FI RR73
191200 -10 2453  VA2WU F4ISZ JN38
40m 
UTC    dB Audio  Message
045600  +5 2756  F4ISZ SP6JIU -06 (x2)
181545 -15 2078  F1LPT/P F4ISZ R-03 (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.

CW

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

Explore CW reception at SO8OO

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee