IU1DSU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Italy Most frequent locator attributed to this token: JN44

Receiver-side FT8 activity involving IU1DSU, decoded by SO8OO in southeastern Poland. 100 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, 10m, across 18 UTC dates in the available aggregate history. Observed between 2026-06-08 and 2026-09-21.

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 100 FT8 messages attributed to IU1DSU as the transmitting token by decoded message structure across 18 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (60%), followed by 20 m (21%) and 60 m (14%). Several six-hour UTC windows tied for the largest share (77%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

100
Messages attributed
18
UTC dates decoded
25
Active 15-min windows
-12 dB
Estimated median S/N

Bands

60m · 14 40m · 60 20m · 21 10m · 5
First attributed message: 2026-06-08
Last attributed message: 2026-09-21 21:44 UTC

Observed FT8 message patterns

Attributed sample
100 messages
Active dates
18 UTC dates
Estimated median S/N
-12 dB
Estimated 10th-90th percentile
-20 to -4 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 35, moderate (-15 to -9 dB) 38, strong (≥ -8 dB) 27.

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 IU1DSU 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 IU1DSU

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
JN44 · 58 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,137 km (approx.)
Last such locator decoded
2026-09-21 21:43 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 UTCBandIU1DSU S/NCounterpartCounterpart S/NMsgsCapture
09-21 21:44 60m -16 / -4 DL6RS -5 / -1 5 ✓ Full exchange observed
09-21 21:39 40m -16 / - 2E0GKF - / - 2 ✓ Closing fragment
09-20 06:55 40m - / -7 ON1DGN -11 / - 2 ✓ Closing fragment
09-20 02:11 40m -10 / - YN1ZGN - / - 5 Partial capture
09-18 21:10 60m - / - G3UHU -9 / - 3 Partial capture
09-18 21:09 60m -6 / -14 LZ2VQ +14 / -13 5 ✓ Full exchange observed
09-18 06:07 40m - / -16 IU8RFW -6 / - 3 ✓ Closing fragment
09-17 21:46 40m - / - TA3NK +2 / - 8 Partial capture
09-11 21:12 40m +3 / - OE8PIT -10 / -5 4 ✓ Closing observed
09-11 06:24 40m - / -14 SP4MPH -4 / - 2 Partial capture
09-11 06:19 40m - / -3 DA1TE -18 / - 2 Partial capture
09-10 05:14 40m - / - G0BLB +2 / - 2 Partial capture
09-10 05:13 40m -8 / -14 RC2Y -1 / -15 5 ✓ Full exchange observed
09-10 05:11 40m -11 / -12 R5AV -20 / -11 4 ✓ Full exchange observed
09-10 05:08 40m -14 / -9 YO6LM -11 / -7 6 ✓ Full exchange observed
09-10 05:06 40m -12 / - SV9MBH - / -8 2 ✓ Closing fragment
09-10 05:00 40m - / - YO6LM -6 / - 2 Partial capture
08-30 19:28 20m -1 / - BG7BVI - / - 2 Partial capture
08-30 19:20 20m -13 / -20 UA3NFG -12 / - 5 ✓ Closing observed
08-29 22:09 60m - / - EA7L -16 / - 2 ✓ Closing fragment
08-29 22:09 60m - / -14 PE1MHY -4 / - 7 ✓ Closing fragment
08-29 22:03 60m - / -20 OE3OOG -18 / - 2 Partial capture
08-29 22:03 60m - / -6 PE1MHY +4 / - 5 Partial capture
08-29 22:00 60m - / -21 YO9IE -8 / - 2 ✓ Closing fragment
08-29 21:57 60m -15 / - ON7KEI -14 / - 4 ✓ Closing observed
08-29 21:57 60m - / -8 PE1MHY -4 / - 6 Partial capture
08-29 21:53 60m -18 / -7 LY5O +2 / 0 3 ✓ Full exchange observed
08-28 20:49 20m -18 / - UA1AOF - / - 4 ✓ Closing fragment
08-28 20:44 20m -14 / - UA1AOF - / - 2 Partial capture
08-28 20:40 20m -16 / - LA4NM - / -9 2 Partial capture
08-28 20:35 20m - / -18 HA1BF +8 / - 8 Partial capture
08-27 21:28 40m -12 / -6 S57TW +9 / - 4 Partial capture
08-27 21:20 40m -14 / - D2ACE - / - 2 Partial capture
08-20 21:42 40m -14 / -9 DL7ARV -18 / -6 4 ✓ Full exchange observed
08-20 21:37 40m -19 / - BG5JGG - / - 2 Partial capture
08-20 21:32 40m -15 / - DG9UBF - / -12 2 ✓ Closing fragment
08-19 06:33 40m - / -2 GJ0KYZ -18 / - 2 ✓ Closing fragment
08-18 12:21 20m - / - DL1UDO -18 / - 3 Partial capture
08-06 15:47 40m - / +2 S57CT -16 / - 2 Partial capture
08-03 21:42 60m - / - EA3ISZ -22 / - 4 Partial capture
08-03 21:38 60m - / -20 US0QV +5 / - 3 ✓ Closing fragment
08-03 21:36 60m - / -9 F5MYK -9 / - 4 ✓ Closing fragment
08-03 21:34 60m - / -7 OM1AGE -5 / - 3 ✓ Closing fragment
08-03 21:33 60m -18 / -4 DL4KSD -1 / -16 5 ✓ Full exchange observed
08-03 21:31 60m -17 / - DD6ZV -4 / - 4 ✓ Closing observed
08-03 21:31 60m - / - F5MYK -7 / - 3 Partial capture
07-27 15:38 40m - / -19 YO2CNH -19 / - 3 Partial capture
07-26 22:29 20m - / - 9A4ZM +2 / - 2 Partial capture
07-15 09:37 20m - / - ON4KBU -12 / - 4 Partial capture
07-11 22:36 40m -13 / - GU0VPA -19 / -1 3 ✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

60m 
UTC    dB Audio  Message
210900 +13  326  IU1DSU LZ2VQ KN23
210915  -7  326  LZ2VQ IU1DSU -13
210930 +15  326  IU1DSU LZ2VQ R-14
210945  -6  326  LZ2VQ IU1DSU RR73
211000 +14  325  IU1DSU LZ2VQ 73
211030  -8  871  IU1DSU G3UHU IO80 (x3)
214345 -17 1938  CQ IU1DSU JN44
214400  -8 1834  IU1DSU DL6RS JN48
214415 -16 1938  DL6RS IU1DSU -01
214430  -5 1834  IU1DSU DL6RS R-04
214445 -17 1939  DL6RS IU1DSU RR73
214500  -3 1834  IU1DSU DL6RS 73
214630 -17 1614  IU1DSU DL9KM R-07
40m 
UTC    dB Audio  Message
214930  +5  332  IU1DSU TA3NK KM39 (x2)
060700  -8  333  IU1DSU IU8RFW JN70 (x3)
061030 -23 1687  IU1DSU M0CKX -21
021145 -14 1657  YN1ZGN IU1DSU JN44 (x5)
065545  -9 1038  IU1DSU ON1DGN -07 (x2)
213915 -24 1943  2E0GKF IU1DSU JN44 (x2)
20m 
UTC    dB Audio  Message
192045  -9 2365  IU1DSU UA3NFG LO28 (x2)
192130 -13 2370  UA3NFG IU1DSU RR73
192145 -12 2365  IU1DSU UA3NFG 73
192330  -8 2370  CQ IU1DSU JN44
192400 -10 2370  GM3CQD IU1DSU JN44
192430  -8 2370  CQ IU1DSU JN44 (x3)
192615 -16 2367  IU1DSU 9A4ZM JN86
192630  -6 2371  F4IEW IU1DSU JN44
192645  -4 1540  IU1DSU R1QD -10
192730  -4 2371  DH0YAH IU1DSU JN44
192800  -2 2371  BG7BVI IU1DSU JN44 (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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