9A1BTU — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Croatia Most frequent locator attributed to this token: JN85

Receiver-side FT8 activity involving 9A1BTU, decoded by SO8OO in southeastern Poland. 1,731 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 22 UTC dates in the available aggregate history. Observed between 2026-07-04 and 2026-09-19.

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 1,731 FT8 messages attributed to 9A1BTU as the transmitting token by decoded message structure across 22 UTC dates in the available aggregate history. The largest monitored-band total was 80 m (72%), followed by 40 m (28%) and 20 m (0%). Most decodes (92%) 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 (80%); the estimated median was +5 dB.

Overview

1,731
Messages attributed
22
UTC dates decoded
153
Active 15-min windows
+5 dB
Estimated median S/N

Bands

80m · 1,246 40m · 477 20m · 8
First attributed message: 2026-07-04
Last attributed message: 2026-09-19 09:59 UTC

Observed FT8 message patterns

Attributed sample
1,731 messages
Active dates
22 UTC dates
Estimated median S/N
+5 dB
Estimated 10th-90th percentile
-12 to +13.5 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 102, moderate (-15 to -9 dB) 245, strong (≥ -8 dB) 1,384.

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 9A1BTU 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 9A1BTU

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
JN85 · 750 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
610 km (approx.)
Last such locator decoded
2026-09-19 09:59 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 UTCBand9A1BTU S/NCounterpartCounterpart S/NMsgsCapture
09-19 21:01 40m - / -2 RN3AOE +5 / - 5 ✓ Closing fragment
09-19 21:00 40m - / - OE9GWV -1 / - 4 Partial capture
09-19 20:55 40m - / -8 PE1NPS -5 / - 3 ✓ Closing fragment
09-19 20:54 40m - / +3 SH5RJX -5 / - 2 Partial capture
09-19 20:53 40m - / - PD4RJ -13 / - 2 Partial capture
09-19 10:04 40m - / - PD4AH -19 / - 2 Partial capture
09-19 09:59 40m - / - SP6K -7 / - 7 Partial capture
09-18 19:31 40m +2 / - ER1CW - / -6 2 ✓ Closing fragment
09-17 21:24 80m - / - SP3SWJ -8 / - 7 Partial capture
09-17 21:20 80m -2 / - G3SZG - / -14 3 ✓ Closing fragment
09-17 21:18 80m -4 / - OK2VCR -4 / +9 4 ✓ Full exchange observed
09-17 21:18 80m +8 / - F1IQH -15 / -18 3 ✓ Closing observed
09-17 21:16 80m +3 / - IK1NEG - / - 2 Partial capture
09-17 21:12 80m +4 / - F5MYK -23 / -14 5 ✓ Closing observed
09-17 17:45 80m +8 / +2 IZ8VYU +7 / - 5 ✓ Full exchange observed
09-17 17:44 80m +10 / +5 OE8CNI +2 / - 4 ✓ Full exchange observed
09-17 17:42 80m +10 / -5 R5DT +10 / +2 5 ✓ Full exchange observed
09-17 17:40 80m +10 / -11 RC2Y +3 / -6 6 ✓ Full exchange observed
09-17 17:39 80m +3 / -9 R7AW -10 / -24 4 ✓ Full exchange observed
09-06 22:07 80m +1 / - VR2ZXP - / - 3 Partial capture
09-06 22:04 80m +3 / - UA3ATQ -11 / -16 4 ✓ Closing observed
09-06 22:01 80m +2 / -5 DD7EE +2 / +2 6 ✓ Full exchange observed
09-06 22:00 80m +11 / -10 EA3LF +2 / - 5 ✓ Full exchange observed
09-06 21:58 80m +1 / -11 RT6Z -4 / -7 4 ✓ Full exchange observed
09-06 21:44 80m +8 / -6 DK7QJ -4 / -9 4 ✓ Full exchange observed
09-06 21:42 80m +8 / -5 SP9GCZ +9 / 0 5 ✓ Full exchange observed
09-06 21:40 80m 0 / - 4O7CC +7 / - 5 ✓ Full exchange observed
09-04 21:39 80m -2 / - F4CTJ - / - 2 Partial capture
09-04 21:25 80m 0 / -23 UR3QCB -2 / -15 7 ✓ Full exchange observed
09-01 22:15 80m +7 / - GW4HZA - / - 2 Partial capture
08-31 20:29 80m -12 / - MW0DNF - / - 4 Partial capture
08-31 20:25 80m 0 / -16 US2YW +7 / - 4 ✓ Closing observed
08-31 20:24 80m -2 / - SV2FNT - / -5 2 Partial capture
08-31 20:19 80m -14 / - 4L7T - / - 2 Partial capture
08-31 19:53 80m - / -9 OZ1GC -12 / - 2 ✓ Closing fragment
08-31 19:43 80m -3 / -9 F4HIK -19 / -10 6 Partial capture
08-31 19:42 80m -2 / - SM6YRB - / - 2 Partial capture
08-31 19:39 80m -9 / - IU1DXU - / -10 3 ✓ Closing fragment
08-31 19:10 80m -4 / -6 9A3TGY -8 / -3 4 ✓ Full exchange observed
08-31 19:05 80m -2 / -10 UR4LRG +9 / - 4 ✓ Closing observed
08-30 22:32 80m -10 / -4 5P1KZX +14 / - 6 ✓ Full exchange observed
08-30 22:25 80m +1 / -13 GM6URC -14 / -8 7 ✓ Full exchange observed
08-30 22:23 80m +2 / - CT3IQ - / - 4 Partial capture
08-30 22:18 80m +5 / -8 EC3A -18 / -3 5 ✓ Full exchange observed
08-30 22:14 80m +7 / - GJ6WRI - / - 3 Partial capture
08-30 22:13 80m -5 / -9 DK2BJ -2 / 0 5 ✓ Full exchange observed
08-30 22:09 80m +6 / -7 F4BYA +1 / -11 5 ✓ Full exchange observed
08-30 22:09 80m +6 / -5 F5HNQ -6 / -2 5 ✓ Full exchange observed
08-30 22:06 80m +10 / - GJ6WRI - / - 2 Partial capture
08-30 22:05 80m - / - F4BYA 0 / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
205430  -6 1679  9A1BTU SH5RJX R+03
205530  -7  508  9A1BTU PE1NPS JO22 (x3)
205900 -20 1095  9A1BTU SV2IQC KN10
210000  -5 2692  9A1BTU OE9GWV JN47 (x2)
210100  +7  816  9A1BTU RN3AOE KO85
210100  +0 2692  9A1BTU OE9GWV JN47
210130  -3  815  9A1BTU RN3AOE KO85
210130  +4 2692  9A1BTU OE9GWV JN47
210200  +8  816  9A1BTU RN3AOE KO85 (x3)
210330 -19 1619  9A1BTU M7SQI RR73
80m 
UTC    dB Audio  Message
211830  +9 1163  F1IQH 9A1BTU 73
211845  +0 1153  9A1BTU OK2VCR JN89
211900  -4 1163  OK2VCR 9A1BTU +09
211915  -5 1153  9A1BTU OK2VCR R+13 (x2)
212000  -5 1163  G3SZG 9A1BTU R-14 (x3)
212415  -6 1164  9A1BTU SP3SWJ JO82 (x7)
160m 
UTC    dB Audio  Message
174315  -5  713  9A1BTU R5DT 73
20m 
UTC    dB Audio  Message
092715 -19 1687  9A1BTU DL6REX JO40 (x2)
094530 -20 1687  ON1JP 9A1BTU R-17
094745 -18 1820  9A1BTU ON7DE JO20 (x2)
094830 -21 1687  PD0OKP 9A1BTU RR73
094845  -7  328  9A1BTU DL1TJ JN69
094900 -15 1687  CQ 9A1BTU JN85
094930 -18 1687  DL1TJ 9A1BTU +06
095045 -20 1524  9A1BTU DL1UDO JO31
095545 -19 1826  9A1BTU PA6A JO22 (x5)

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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