JA9CHI — reception at SO8OO

Observed FT8 message patterns

Attributed sample

74 messages

Active dates

12 UTC dates

Estimated median S/N

-12 dB

Estimated 10th-90th percentile

-19 to -8 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 19, moderate (-15 to -9 dB) 46, strong (≥ -8 dB) 9.

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 JA9CHI 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 JA9CHI

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

PM86 · 43 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

8,497 km (approx.)

Last such locator decoded

2026-10-12 19:28 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
202330  -5  711  JA9CHI UB3IBG -04
201230  -1 2348  JA9CHI R3ZMM KO90 (x3)
193345 +21  496  JA9CHI OM3SX KN08 (x6)
190300 -13 1379  JA9CHI UA4FKT LO23 (x4)
202515  -2 2771  JA9CHI 4J3DJ RR73

UTC    dB Audio  Message
194300  -9 1621  JA9CHI UX1AA KO70 (x3)
194730  -5 1694  JA9CHI RU3T LO16 (x2)
191600 -24 2303  JA9CHI TF4M -09 (x4)
191315  -9 1238  JA9CHI RX3DTN -19 (x2)
192815 -18 1780  UR4UY JA9CHI PM86 (x2)
205630  +8 2729  JA9CHI IZ6BRN -15 (x2)

UTC    dB Audio  Message
194815 +20  642  JA9CHI HB9ELE -19 (x2)
195445  +3  761  JA9CHI UA3ROJ -19
195445  -4 1906  JA9CHI DK7ZT -15 (x3)
203730  -1 2927  JA9CHI RW3ZC -12 (x2)
203900 -16 1896  JA9CHI R3MDY KO84 (x3)
190400  -7 1533  JA9CHI 9A3MRN -15 (x2)
190730  -2 1415  JA9CHI LX1JH JN39 (x2)

UTC    dB Audio  Message
202430 -16 1964  DL7BG JA9CHI 73
202600 -15 1965  DL1HTB JA9CHI PM86 (x3)
202715  +7 1401  JA9CHI F5RAV JN09 (x4)
220900  +3  532  JA9CHI LZ2INP KN34 (x2)
212730  -9 1074  OZ3DTP JA9CHI PM86
214130 -13 1074  PD0IFI JA9CHI -09 (x3)
214345 -14  943  JA9CHI PD0IFI 73

UTC    dB Audio  Message
105630  -5 2492  JA9CHI DN9OPA JN38 (x8)
110445 -16 1594  JA9CHI CT7AXN -07 (x2)
111045  -4  666  JA9CHI CR7BRV +01 (x2)
111215 -15 1903  JA9CHI IK1JUS JN35
111615  +3 2125  JA9CHI CT2IBL -08 (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.