RC5Z — reception at SO8OO

Observed FT8 message patterns

Attributed sample

207 messages

Active dates

2 UTC dates

Estimated median S/N

-6.8 dB

Estimated 10th-90th percentile

-12 to -2 dB

Recurring-pattern threshold

Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 5, moderate (-15 to -9 dB) 58, strong (≥ -8 dB) 144.

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 RC5Z 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 RC5Z

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

KO81 · 116 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

1,083 km (approx.)

Last such locator decoded

2026-08-25 15:38 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
153445  -5  789  S57TW RC5Z KO81
153500 +11  591  RC5Z S57TW -12
153515  -9  789  CQ RC5Z KO81
153530 +13  591  RC5Z S57TW -12
153530  -4  789  RC5Z PA1PXL JO21
153545  -3  789  S57TW RC5Z R-08
153600  +9  591  RC5Z S57TW -12
153600  -5  789  RC5Z PA1PXL JO21
153615  -8  788  S57TW RC5Z R-20
153630  +9  591  RC5Z S57TW RR73
153645  -7  789  S57TW RC5Z 73
153715  -7  788  CQ RC5Z KO81
153745  -7  789  R2ZR RC5Z R-14 (x2)
153845  -5  789  CQ RC5Z KO81

UTC    dB Audio  Message
145600  -4 2016  RC5Z UN7PNF -03 (x4)
145815 -11 2387  CQ RC5Z KO81
145830  -5 2016  RC5Z UN7PNF -03 (x2)
145945 -10 2387  UN7PNF RC5Z R+02 (x2)
150045 -12 2387  CQ RC5Z KO81
150145 -10 2388  BD6KDG RC5Z RR73
150215 -10 2387  BG4LNW RC5Z R-13
150545  -7 2387  CQ RC5Z KO81
150630 -20 2080  RC5Z PI4TX JO22
150815  -6 2387  CQ RC5Z KO81

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.