GM4CXM — FT8 activity observed at SO8OO

Observed FT8 message patterns

Attributed sample

632 messages

Active dates

31 UTC dates

Estimated median S/N

-4.4 dB

Estimated 10th-90th percentile

-16 to +5 dB

Recurring-pattern threshold

Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 69, moderate (-15 to -9 dB) 132, strong (≥ -8 dB) 431.

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 GM4CXM 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 GM4CXM

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

IO75 · 259 decoded messages

SO8OO receiver locator

KN09VW

Locator-centre separation

1,894 km (approx.)

Last such locator decoded

2026-09-09 23:29 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
232415 -14 1642  GM4CXM UR3QCB KN77
232430 -12 1643  UR3QCB GM4CXM -20
232445  -9 1642  GM4CXM UR3QCB R-18
232500 -13 1643  UR3QCB GM4CXM RR73
232515  -7 1642  GM4CXM UR3QCB 73
232530 -15 1643  AA4VV GM4CXM -23 (x2)
232630 -14 1643  CQ GM4CXM IO75
232715  -7 1643  GM4CXM M8FQT IO93
232730 -16 1643  M8FQT GM4CXM -06
232745  +3 1643  GM4CXM M8FQT R+12
232800 -15 1643  M8FQT GM4CXM RR73
232815  -3 1643  GM4CXM M8FQT 73
232845 -10 1643  RD9U GM4CXM IO75 (x2)

UTC    dB Audio  Message
091030 -11 1394  GM4CXM RL1B -09
091030 -11 1002  GM4CXM F4JKY/P RR73
091045  -1  821  F4JKY/P GM4CXM 73
091100  -8 1393  GM4CXM RL1B -09
091100  -7  372  GM4CXM F4NKF JN13 (x2)
091145  +3  821  F4NKF GM4CXM -05
091200  -6  371  GM4CXM F4NKF R+02
091215  +6  821  F4NKF GM4CXM RR73
091230  -4  372  GM4CXM F4NKF 73
091245  +6  821  SP9SIR GM4CXM IO75 (x3)
091415  +6  821  DL2VLL GM4CXM +15 (x2)

UTC    dB Audio  Message
212930 -12 2177  PD4RJ GM4CXM 73
212945 -13 1609  GM4CXM GW0ARK +06
213030 -11 2177  GW0ARK GM4CXM 73
213100  -8 2177  CQ GM4CXM IO75
213115  -7 2736  GM4CXM F1PBZ -02
213130  -9 2177  DH6MM GM4CXM -06
213145  -8 2736  GM4CXM F1PBZ -02
213200 -10 2177  DH6MM GM4CXM RR73
213230 -14 2177  CQ GM4CXM IO75
213300 -11 2177  DH6MM GM4CXM +10
213400 -10 2177  PY4LX GM4CXM -25 (x2)
213500  -9 2177  SP9DPI GM4CXM -20 (x3)

UTC    dB Audio  Message
230615 -10  659  GM4CXM SV2CLJ -13 (x2)
070745 -22 1645  GM4CXM YO4GIY -10 (x2)
070845  -7 1157  GM4CXM DN9SGE JO42
070915  +2 2948  GM4CXM DO1FDK JO41
070915  -5 1157  GM4CXM DN9SGE R+09
070945  +0 2948  GM4CXM DO1FDK JO41
070945  -3 1157  GM4CXM DN9SGE 73
071045  +3 2947  GM4CXM DO1FDK JO41

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.