IS0PTW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sardinia Most frequent locator attributed to this token: JN41

Receiver-side FT8 activity involving IS0PTW, decoded by SO8OO in southeastern Poland. 160 FT8 messages attributed to this token as transmitter, on 20m, across 13 UTC dates in the available aggregate history. Observed between 2026-06-13 and 2026-08-25.

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 160 FT8 messages attributed to IS0PTW as the transmitting token by decoded message structure across 13 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Most decodes (82%) fell within the six-hour window 15:00-21:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

160
Messages attributed
13
UTC dates decoded
24
Active 15-min windows
-10 dB
Estimated median S/N

Bands

20m · 160
First attributed message: 2026-06-13
Last attributed message: 2026-08-25 17:41 UTC

Observed FT8 message patterns

Attributed sample
160 messages
Active dates
13 UTC dates
Estimated median S/N
-10 dB
Estimated 10th-90th percentile
-19 to 0 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 31, moderate (-15 to -9 dB) 57, strong (≥ -8 dB) 72.

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 IS0PTW 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 IS0PTW

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
JN41 · 119 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,363 km (approx.)
Last such locator decoded
2026-08-25 17:41 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 UTCBandIS0PTW S/NCounterpartCounterpart S/NMsgsCapture
08-25 17:43 20m - / -8 RU3QR +10 / - 9 Partial capture
08-25 17:41 20m - / - F4BYA +10 / - 3 Partial capture
08-25 17:40 20m - / -15 BG7BMG -18 / - 2 Partial capture
08-25 17:38 20m 0 / - 9K2MP - / - 3 Partial capture
08-25 17:36 20m -6 / - DL1HDL - / - 2 Partial capture
08-25 17:34 20m -2 / - DM6KW - / -20 3 Partial capture
08-25 17:32 20m -1 / - UC6B - / - 3 Partial capture
08-25 17:30 20m -4 / -15 R4CC +8 / -15 5 ✓ Full exchange observed
08-16 09:36 20m - / - OE4RGC +8 / - 2 Partial capture
08-04 17:02 20m - / -17 YO9HP -6 / - 2 ✓ Closing fragment
08-02 15:16 20m -12 / - EA6VD - / - 4 Partial capture
08-02 15:13 20m -10 / - BI6AN - / - 4 Partial capture
08-02 15:11 20m - / - M0FTL -20 / - 3 Partial capture
07-29 20:08 20m -6 / - 7Z1BM - / -16 4 Partial capture
07-26 19:38 20m -16 / - OZ5ADW - / -1 6 Partial capture
07-26 19:29 20m -12 / -19 TA2ED -15 / -22 6 ✓ Full exchange observed
07-25 20:05 20m - / - EB3JT -9 / - 7 Partial capture
07-19 18:46 20m - / - R6OIW -20 / - 2 Partial capture
07-19 15:21 20m -20 / - E75YZ - / - 3 Partial capture
07-19 08:03 20m - / - OE4RGC +4 / - 4 Partial capture
07-19 08:01 20m - / -19 OK1WCF -9 / - 5 Partial capture
07-19 07:55 20m - / - OE4RGC +1 / - 3 Partial capture
07-19 07:52 20m - / -24 SP6VXS -10 / - 2 ✓ Closing fragment
07-19 07:38 20m - / -9 F1ODM -12 / - 2 ✓ Closing fragment
07-17 19:01 20m - / - UR1CCO -8 / - 2 Partial capture
07-17 18:58 20m -16 / - SV2TCC - / +2 3 ✓ Closing fragment
07-07 18:53 20m -12 / - A61CK - / - 3 Partial capture
07-05 08:29 20m - / -14 UR5ZGY -6 / - 2 Partial capture
07-02 19:33 20m -13 / - OL6WWA - / - 5 Partial capture
07-02 19:30 20m - / - ON4CVL -10 / - 2 Partial capture
07-02 19:28 20m -2 / +6 IZ2DPX -1 / -3 5 ✓ Full exchange observed
07-02 19:20 20m -13 / -6 II1WWA -18 / -22 11 Partial capture
06-28 15:24 20m - / -2 IN3ADG -20 / - 2 Partial capture
06-28 15:13 20m - / -12 R9FE -9 / - 3 ✓ Closing fragment
06-26 19:01 20m -18 / - YO6PNM - / - 4 Partial capture
06-26 18:58 20m -17 / -6 CR7BUJ -12 / -2 8 ✓ Full exchange observed
06-26 18:57 20m - / - F4HSB -22 / - 6 Partial capture
06-26 18:56 20m -14 / - LZ1ZF - / -7 2 ✓ Closing fragment
06-24 19:02 20m - / -12 EA7BD -20 / - 3 Partial capture
06-24 18:53 20m - / - M5MOW -6 / - 3 Partial capture
06-24 18:49 20m -17 / - EA7TB -14 / - 2 ✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

20m 
UTC    dB Audio  Message
174100 -19 2275  IS0PTW BG7BMG -15
174115  -5 1931  CQ IS0PTW JN41
174130  +6 2917  IS0PTW F4BYA JN19
174200 -20 1929  IS0PTW ON2CB JO20
174200  +9 2917  IS0PTW F4BYA JN19 (x2)
174300 +14  953  IS0PTW RU3QR -08 (x9)

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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