4U1A — reception at SO8OO

Observed FT8 message patterns

Attributed sample

554 messages

Active dates

24 UTC dates

Estimated median S/N

-2 dB

Estimated 10th-90th percentile

-17 to +11 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 73, moderate (-15 to -9 dB) 75, strong (≥ -8 dB) 406.

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 4U1A 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 4U1A

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

JN88 · 165 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

383 km (approx.)

Last such locator decoded

2026-10-15 14:40 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
091045  +5 2733  4U1A F1PBZ -18
091745  +2  951  4U1A IU5RTR JN53 (x2)
101715 -18 1271  4U1A RK6MC +08
082915 -24 1367  4U1A UN0NZZ 73
105100  +0 2275  4U1A RA3XDX KO85 (x4)
121145 -23 2234  4U1A 5Z4RS +05

UTC    dB Audio  Message
225815  -1 3198  9T0MD 4U1A JN88 (x2)
230500  +8 1708  4U1A OM2WQ JN88 (x4)
142115 -18 2253  H49A 4U1A JN88 (x9)

UTC    dB Audio  Message
171800  -5 1852  4U1A YO2OXD KN05
171815 +16 2255  H49A 4U1A JN88
171830  -7 1852  4U1A YO2OXD KN05
171845 +14 2255  H49A 4U1A JN88
171900  -9 1852  4U1A YO2OXD KN05
171915 +13 2255  H49A 4U1A JN88
171930  -3 1852  4U1A YO2OXD KN05 (x2)
172000  +4 2021  4U1A DM1HR JO62
172015 +11 2255  H49A 4U1A R+00
172030 -10 1852  4U1A YO2OXD KN05
172030  +4 2021  4U1A DM1HR -11
172100  -8 1852  4U1A YO2OXD KN05 (x3)

UTC    dB Audio  Message
202700  -3 2300  4U1A R4RZ R-20
202715  +5 1072  R4RZ 4U1A RR73
202745  -5 1072  DA6VK 4U1A R-09 (x3)
202900 -23 1071  4U1A DA6VK 73
202930  -3 1988  4U1A RX3MX KO97
202930  -1 1071  4U1A LB5WB +00 (x5)
204115  +6 2058  RI1FJZ 4U1A JN88 (x3)

UTC    dB Audio  Message
145930 -12 2015  4U1A PE1OID +17
145930  -9 1339  4U1A DM2CNE JO73
150000  -9 2016  4U1A PE1OID +17 (x13)

UTC    dB Audio  Message
102615  -6  782  KP2B 4U1A JN88 (x2)
095045 -19 2208  VP2MAA 4U1A JN88 (x2)
095130 -15 2003  4U1A VP2MAA +00
095145 -22 2207  VP2MAA 4U1A R-09 (x2)
095315 -23 2207  YV5JLO 4U1A JN88 (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.