OT4A — reception at SO8OO

Observed FT8 message patterns

Attributed sample

700 messages

Active dates

21 UTC dates

Estimated median S/N

0 dB

Estimated 10th-90th percentile

-8 to +9 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 12, moderate (-15 to -9 dB) 55, strong (≥ -8 dB) 633.

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 OT4A 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 OT4A

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

JO21 · 437 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

1,192 km (approx.)

Last such locator decoded

2026-10-21 19:33 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
191130  +1  686  OT4A T77RN RR73
191145  +6  686  T77RN OT4A 73
191945  +6  323  CQ DX OT4A JO21 (x2)
192100  +7  406  OT4A M0IOY IO93
192115  +8  323  CQ DX OT4A JO21
192130  +9  406  OT4A M0IOY IO93
192145  +4  323  CQ DX OT4A JO21 (x4)
193315  +8 1228  VE1YX OT4A JO21 (x3)
193500 -14 1233  OT4A IU8LLQ JN71

UTC    dB Audio  Message
053230  -8 2444  OT4A DG9FFM JN49
053245  +1 2443  CQ DX OT4A JO21 (x4)
053830  -3 2546  OT4A DG9FFM JN49
054030 -16 2106  OT4A CT2GQA 73
054715  -2 1306  YV6BXN OT4A JO21 (x4)
054915  +0 2320  VE3BR OT4A -13 (x4)

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.