SI4A — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Sweden Most frequent locator attributed to this token: JO69

Receiver-side FT8 activity involving SI4A, decoded by SO8OO in southeastern Poland. 150 FT8 messages attributed to this token as transmitter, on 160m, 80m, 60m, 40m, 20m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-15 and 2026-09-16.

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 150 FT8 messages attributed to SI4A as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (37%), followed by 80 m (34%) and 160 m (12%). Several six-hour UTC windows tied for the largest share (63%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

150
Messages attributed
9
UTC dates decoded
24
Active 15-min windows
-14 dB
Estimated median S/N

Bands

160m · 18 80m · 51 60m · 17 40m · 56 20m · 8
First attributed message: 2026-06-15
Last attributed message: 2026-09-16 21:46 UTC

Observed FT8 message patterns

Attributed sample
150 messages
Active dates
9 UTC dates
Estimated median S/N
-14 dB
Estimated 10th-90th percentile
-21 to +3 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 58, moderate (-15 to -9 dB) 36, strong (≥ -8 dB) 56.

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 SI4A 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 SI4A

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
JO69 · 74 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
1,202 km (approx.)
Last such locator decoded
2026-09-16 21:46 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 UTCBandSI4A S/NCounterpartCounterpart S/NMsgsCapture
09-17 19:23 60m - / -14 EA1IOK -4 / - 3 ✓ Closing fragment
09-17 19:22 60m - / -4 ON5RZ -16 / - 3 ✓ Closing fragment
09-17 19:21 60m - / -12 SN31ROT -1 / - 2 Partial capture
09-16 21:42 160m -22 / - RI1FJZ - / -20 8 Partial capture
09-16 21:35 160m -22 / - RI1FJZ - / - 4 Partial capture
09-16 21:27 160m -22 / - RI1FJZ - / - 2 Partial capture
09-16 21:15 160m -20 / - RI1FJZ - / - 2 Partial capture
09-16 21:03 160m -22 / - RI1FJZ - / - 2 Partial capture
09-16 20:58 160m - / - SP9CSE -4 / - 2 Partial capture
09-15 23:07 80m -4 / - RI1FJZ - / -11 15 ✓ Closing fragment
09-15 15:40 40m -12 / -9 HG8LXL -1 / -6 5 ✓ Full exchange observed
09-15 15:39 40m -7 / -1 OZ9FF 0 / - 4 ✓ Full exchange observed
09-15 15:37 40m -12 / - OZ1NIB - / -1 2 ✓ Closing fragment
09-15 15:35 40m -12 / - M8KHC - / - 2 Partial capture
09-14 23:43 80m - / -10 EC3A -22 / - 2 Partial capture
09-14 23:02 80m 0 / - KP4AA - / -7 3 ✓ Closing fragment
09-14 23:00 80m -6 / -4 SQ4PKO +12 / +3 5 ✓ Full exchange observed
09-14 22:59 80m -4 / -4 9A3AUH +6 / -7 5 ✓ Full exchange observed
09-14 22:58 80m -5 / +4 VO1HH -9 / -3 5 ✓ Full exchange observed
09-14 22:57 80m +2 / - KP4AA - / - 2 Partial capture
08-18 20:28 60m -16 / -6 LX1JX +4 / -1 5 ✓ Full exchange observed
08-18 20:19 60m -19 / - OJ0YL - / - 3 Partial capture
08-18 20:16 60m -16 / -7 PA0EBG -12 / - 3 ✓ Closing observed
08-18 20:13 60m -16 / -10 IV3DSG +5 / -2 5 ✓ Full exchange observed
08-18 20:13 60m - / -8 YO6LM +4 / - 4 ✓ Closing fragment
08-17 22:21 80m +7 / +2 HB3YBG +4 / -14 5 ✓ Full exchange observed
08-17 22:21 80m +10 / -2 OM1AGE -1 / -12 8 ✓ Full exchange observed
08-17 22:19 80m +5 / -12 EA7LIC -11 / -9 6 ✓ Full exchange observed
08-17 22:19 80m +8 / - 9J2FI - / - 2 Partial capture
08-17 22:11 80m +6 / - RA3TOS - / -12 2 ✓ Closing fragment
08-17 22:09 80m +6 / +8 OG1AO +9 / +8 5 ✓ Full exchange observed
08-17 22:04 80m +1 / - <...> - / -16 3 Partial capture
07-20 03:25 40m -16 / - KZ4NS - / - 2 ✓ Closing fragment
07-20 03:23 40m -16 / - F6FHZ - / -14 2 ✓ Closing fragment
07-20 03:22 40m -15 / - W4GGJ - / -10 2 ✓ Closing fragment
07-20 03:21 40m -14 / - NW5X - / -14 2 ✓ Closing fragment
07-20 03:19 40m -16 / - KK4CDK - / -7 2 ✓ Closing fragment
07-20 03:17 40m -17 / - XQ3SK - / -18 4 ✓ Closing fragment
07-20 03:15 40m -15 / - SV1SFZ - / -25 2 Partial capture
07-20 03:14 40m -16 / - <...> - / -5 2 Partial capture
07-20 03:12 40m -16 / - AA9JC - / -17 2 Partial capture
07-20 03:09 40m -13 / - N8A - / -16 4 Partial capture
07-20 03:07 40m -17 / - YY5AEZ - / -10 3 ✓ Closing fragment
07-20 03:05 40m -16 / - HI3QMT - / -7 3 ✓ Closing fragment
07-20 03:03 40m -18 / - N8A - / - 3 Partial capture
07-20 02:58 80m 0 / - KF9UG - / - 3 Partial capture
07-19 23:06 40m - / 0 DL9KM -11 / - 5 ✓ Closing fragment
07-19 23:05 40m - / 0 F5PBG -13 / - 2 Partial capture
07-18 18:38 40m -13 / - T22TT - / - 2 Partial capture
07-18 18:16 40m - / +4 RA3SI -19 / - 3 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

60m 
UTC    dB Audio  Message
201945 -20 2141  OJ0YL SI4A JO69 (x2)
202815 -17 1678  LX1JX SI4A JO69
202830  +5 2815  SI4A LX1JX -06
202845 -16 1678  LX1JX SI4A R-01
202900  +3 2815  SI4A LX1JX RR73
202915 -15 1677  LX1JX SI4A 73
192115  -1 1114  SI4A SN31ROT -12 (x2)
192215 -18 2285  SI4A ON5RZ JO21 (x3)
192315  -7  481  SI4A EA1IOK IN62 (x3)
80m 
UTC    dB Audio  Message
230745  -6 1201  RI1FJZ SI4A JO69 (x14)
191545 -24 1546  SI4A M8LOD -15
160m 
UTC    dB Audio  Message
212715 -21 1452  RI1FJZ SI4A JO69 (x6)
214130 -15 1058  SI4A DB100FT -10
214245 -20 1403  RI1FJZ SI4A JO69 (x8)
40m 
UTC    dB Audio  Message
033415 -16 1811  HI3JMS SI4A JO69
195530 -13 1110  UI6O SI4A JO69
153530 -14 1693  M8KHC SI4A JO69 (x2)
153730 -13 1693  OZ1NIB SI4A R-01 (x2)
153915  +2 2314  SI4A OZ9FF -01
153930  -6 1693  OZ9FF SI4A R+12
153945  -1 2314  SI4A OZ9FF RR73
154000  -8 1693  OZ9FF SI4A 73
154015  -1 1647  SI4A HG8LXL KN06
154030  -9 1693  HG8LXL SI4A -06
154045  -1 1647  SI4A HG8LXL R-09
154100 -14 1693  HG8LXL SI4A RR73
154115  -2 1647  SI4A HG8LXL 73

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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