4U1UN — FT8 activity observed at SO8OO

Observed FT8 message patterns

Attributed sample

23 messages

Active dates

2 UTC dates

Estimated median S/N

-21 dB

Estimated 10th-90th percentile

-24 to -18 dB

Recurring-pattern threshold

Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 23, moderate (-15 to -9 dB) 0, strong (≥ -8 dB) 0.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with 4U1UN 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 4U1UN

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

FN30 · 2 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

6,990 km (approx.)

Last such locator decoded

2026-09-30 00:11 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.

Recent FT8 messages decoded at SO8OO

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

UTC    dB Audio  Message
213400  -7 2931  4U1UN DL7ARV JO62
213430 -11 2656  4U1UN PY5QW -11
213430 -12 1526  4U1UN IZ0RPS JN52
213430 -15 1057  4U1UN G1ROK IO91
213500  -9 2656  4U1UN PY5QW -11
213500 -12 1526  4U1UN IZ0RPS JN52
213500 -11 1057  4U1UN G1ROK IO91
213530  -9 2656  4U1UN PY5QW -11
213530  -8 1057  4U1UN G1ROK IO91 (x2)
214030 -11 2495  4U1UN PY5QW -11 (x4)
230030  -5 2778  4U1UN PT7YB HI06

UTC    dB Audio  Message
044130  +5  442  4U1UN IZ0BVU R-26
044200 -11  666  4U1UN SV2JAO -17
044200  +7  442  4U1UN IZ0BVU R-26
044230  -8  666  4U1UN SV2JAO -17
044230  +4  442  4U1UN IZ0BVU R-26
044300 -13  666  4U1UN SV2JAO -17
044300  -2  442  4U1UN IZ0BVU R-26 (x3)
044430 -13  666  4U1UN SV2JAO -17
044430  +0  442  4U1UN IZ0BVU R-26
044500 -16  666  4U1UN SV2JAO -17
044500  +5  442  4U1UN IZ0BVU R-26
044530 -12  666  4U1UN SV2JAO -17
044530 +10  442  4U1UN IZ0BVU 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.