RD4A — reception at SO8OO

Observed FT8 message patterns

Attributed sample

783 messages

Active dates

44 UTC dates

Estimated median S/N

-9 dB

Estimated 10th-90th percentile

-20.7 to +4.4 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 192, moderate (-15 to -9 dB) 222, strong (≥ -8 dB) 369.

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 RD4A 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 RD4A

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

LN28 · 526 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

1,686 km (approx.)

Last such locator decoded

2026-10-15 16:56 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
175130 -22 1596  JY5JA RD4A LN28
124200 -15  828  RD4A 6W/IK2HKT -16
124630  -7  767  RD4A RR73; YO9HP <...> -20

UTC    dB Audio  Message
162415 -21 1473  RD4A MI0CBH RR73

UTC    dB Audio  Message
194045 -14 1575  RI1FJZ RD4A LN28 (x6)
195030 -11 2521  RD4A R2EA/P -19
195045 -17 1575  RI1FJZ RD4A LN28
182215 -24 1925  R9CS/P RD4A LN28 (x4)
165545 -24 2002  H49A RD4A LN28 (x3)

UTC    dB Audio  Message
162945 -10 1050  RD4A YO4LUP KN43
162945 -19 1881  RD4A OS4K +07
162945 +14  633  RD4A EW4DX KO23 (x3)
163115  -7 1107  <R6DOB/M> RD4A LN28 (x3)
163300  -4 1313  RD4A S53AK JN76 (x7)

UTC    dB Audio  Message
172715 -18 2053  RD4A UB1Q -10
172730  -7 2263  UB1Q RD4A R+09
172745 -13 2053  RD4A UB1Q RR73
172800  -6 2263  UB1Q RD4A 73
230530 +14  344  RD4A IA5/4O7CC -03
230545  +3 1126  II8IHBC RD4A R-10
174515 -11 1584  RI1FJZ RD4A LN28 (x3)
182500  +4 2365  RD4A R3RRC/P -09
182745 -10 1863  V51WH RD4A LN28 (x3)
164345 -21 1965  <RO2E/M> RD4A LN28
164400  -8 2789  RD4A RO2E/M -04

UTC    dB Audio  Message
033415 -14  775  CQ RD4A LN28 (x3)
033530 -15 1319  RD4A RW9CC MO06 (x2)
033615  +6  775  RW9CC RD4A RR73
033630 -21 1319  RD4A RW9CC 73
033800 +12  776  RI1ANC RD4A LN28 (x8)

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.