YU1FW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Serbia Most frequent locator attributed to this token: KN04

Receiver-side FT8 activity involving YU1FW, decoded by SO8OO in southeastern Poland. 753 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 45 UTC dates in the available aggregate history. Observed between 2026-06-10 and 2026-09-18.

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 753 FT8 messages attributed to YU1FW as the transmitting token by decoded message structure across 45 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (45%), followed by 40 m (28%) and 60 m (15%). Most decodes (74%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (79%); the estimated median was 0 dB.

Overview

753
Messages attributed
45
UTC dates decoded
121
Active 15-min windows
0 dB
Estimated median S/N

Bands

80m · 341 60m · 113 40m · 211 20m · 87 10m · 1
First attributed message: 2026-06-10
Last attributed message: 2026-09-18 20:10 UTC

Observed FT8 message patterns

Attributed sample
753 messages
Active dates
45 UTC dates
Estimated median S/N
0 dB
Estimated 10th-90th percentile
-15 to +14 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 68, moderate (-15 to -9 dB) 91, strong (≥ -8 dB) 594.

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 YU1FW 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 YU1FW

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
KN04 · 586 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
608 km (approx.)
Last such locator decoded
2026-09-18 20:06 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 UTCBandYU1FW S/NCounterpartCounterpart S/NMsgsCapture
09-18 20:10 80m -7 / -4 YO4NF +2 / -6 3 ✓ Full exchange observed
09-18 20:06 80m -24 / -5 T77R -7 / - 2 Partial capture
09-18 20:00 80m +3 / - T77R - / - 7 Partial capture
09-18 19:56 80m +4 / - IT9FEG - / -16 2 ✓ Closing fragment
09-18 19:52 80m - / - IT9FEG -14 / - 2 Partial capture
09-18 19:51 80m +6 / -14 R2EA/P -2 / -24 12 ✓ Full exchange observed
09-15 17:38 80m +13 / - KH8WW - / - 11 Partial capture
09-15 16:47 80m +13 / - KH8WW - / - 46 ✓ Closing fragment
09-15 15:58 80m +4 / - YE4FNN - / - 9 Partial capture
09-14 18:59 80m +4 / -13 DL50IPARC +9 / - 9 Partial capture
09-14 18:58 80m +9 / - SO100PKP - / - 3 Partial capture
09-14 16:33 80m +2 / - KH8WW - / -1 4 Partial capture
09-12 22:28 60m +5 / - TF8KW - / - 5 Partial capture
09-12 22:09 60m +4 / +5 ER1CW -8 / -11 5 ✓ Full exchange observed
09-12 18:56 40m +1 / - KH8WW - / - 6 Partial capture
09-12 18:40 40m 0 / - KH8WW - / - 22 Partial capture
09-11 18:08 80m +5 / -6 HF100PKP +3 / -6 5 Partial capture
09-10 18:40 80m +10 / - BX4AP - / - 5 Partial capture
09-10 03:11 80m +12 / - HK3X - / - 7 Partial capture
09-10 02:03 80m - / -13 UB4CJS -18 / - 2 Partial capture
09-10 02:03 80m +9 / - SZZZ/YU1FW - / -11 4 Partial capture
09-10 02:01 80m - / +9 OL900LTV 0 / - 4 Partial capture
09-09 04:44 80m +6 / - YV6BXN - / - 3 Partial capture
09-09 04:39 80m +4 / - HK3O -12 / -15 9 ✓ Closing observed
09-08 21:25 40m -20 / - VP8A - / - 6 Partial capture
09-07 03:49 60m +14 / -9 VE3EY -12 / -7 6 ✓ Full exchange observed
09-07 03:45 60m +10 / -12 VE3FF -15 / -6 6 ✓ Full exchange observed
09-07 03:42 60m +13 / - AM42SDC - / -8 2 Partial capture
09-05 02:41 80m +9 / - R1943OD - / -15 4 Partial capture
09-05 02:40 80m +10 / - DK5AN/P - / - 3 Partial capture
09-05 02:39 80m +12 / - OM/DL7AU/P - / - 2 Partial capture
09-05 02:36 80m +12 / - SO100PKP - / - 3 Partial capture
09-05 02:32 80m +13 / - II0CDS - / - 3 Partial capture
09-05 02:24 80m +14 / - SO100PKP - / - 10 Partial capture
09-05 02:21 80m +16 / - HF100PKP - / - 3 Partial capture
09-05 02:04 80m - / - R9WCK -14 / - 2 Partial capture
09-05 02:01 80m +14 / - VE3XN - / - 4 Partial capture
09-05 01:49 80m +14 / - VO2NS - / - 3 Partial capture
09-04 22:17 80m - / - DO1ARD +4 / - 4 Partial capture
09-04 22:16 80m +14 / - ZR1JT - / - 4 Partial capture
09-04 22:14 80m +15 / - DU2W - / - 2 Partial capture
09-04 22:07 80m +14 / - DU2W - / -16 10 Partial capture
09-03 18:46 80m +17 / -2 <...> +3 / -1 6 Partial capture
09-03 18:40 80m +12 / - ZS1IB - / - 2 Partial capture
09-03 18:31 80m +9 / - BX4AQ - / - 6 Partial capture
09-03 09:21 40m -21 / -5 SQ100PKP +8 / - 2 Partial capture
09-02 19:15 80m +5 / - BX4AQ - / - 2 Partial capture
09-02 17:28 80m +8 / - BX4AQ - / - 9 Partial capture
09-01 20:58 40m -8 / - SN100PKP - / -15 5 Partial capture
09-01 17:38 80m +2 / - 5W1SA - / -9 4 Partial capture

Recent FT8 messages decoded at SO8OO

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

80m 
UTC    dB Audio  Message
195530  +3  613  R2EA/P YU1FW 73
195600  +7  614  IT9FEG YU1FW -16 (x2)
200030  +3  614  T77R YU1FW KN04 (x8)
200645  -7 1703  YU1FW T77R -05
201015  +0 1301  YU1FW YO4NF -04
201030  -7 1300  YO4NF YU1FW R-06
201045  +3 1300  YU1FW YO4NF RR73
60m 
UTC    dB Audio  Message
034945 +14 2212  VE3EY YU1FW -07
035000  -8 2450  YU1FW VE3EY R-09
035015 +14 2212  VE3EY YU1FW RR73
035030  -9 2451  YU1FW VE3EY 73
035030  -9  739  YU1FW MI0OBC +00
220930  +5 2025  ER1CW YU1FW KN04
220945 -10 1659  YU1FW ER1CW +05
221000  +3 2025  ER1CW YU1FW R-11
221015  -7 1659  YU1FW ER1CW RR73
221100  +5 2025  ER1CW YU1FW KN04
222815  +4 2025  TF8KW YU1FW KN04 (x5)
40m 
UTC    dB Audio  Message
184730  +1 1090  KH8WW YU1FW KN04 (x15)
20m 
UTC    dB Audio  Message
184715 -14 1262  RZ3Z/P YU1FW KN04
155915 -11 1003  YU1FW JA6VQA PM53 (x3)
070515 -17 1279  <...> YU1FW KN04 (x2)
190000 -20 1771  YU1FW 7Z1DX -16 (x2)
170030  -2 1560  BH4THI YU1FW KN04 (x4)
223045 -12  721  YU1FW IS0LLL -11 (x2)
204800 -12 1883  OO0O YU1FW KN04
10m 
UTC    dB Audio  Message
090230 -13 1407  YU1FW GJ0KYZ -10 (x3)
082400  -1 2242  YU1FW RN6MA +03 (x2)
121245 -22 1096  EU1EU YU1FW KN04
120215  +2 1717  YU1FW OE2VEL +16 (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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