JM3OCJ — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Japan Most frequent locator attributed to this token: PM74

Receiver-side FT8 activity involving JM3OCJ, decoded by SO8OO in southeastern Poland. 65 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-09-18.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 65 FT8 messages attributed to JM3OCJ as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (98%), followed by 40 m (2%). Several six-hour UTC windows tied for the largest share (97%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -10 dB.

Overview

65
Messages attributed
9
UTC dates decoded
14
Active 15-min windows
-10 dB
Estimated median S/N

Bands

40m · 1 20m · 64
First attributed message: 2026-06-06
Last attributed message: 2026-09-18 20:06 UTC

Observed FT8 message patterns

Attributed sample
65 messages
Active dates
9 UTC dates
Estimated median S/N
-10 dB
Estimated 10th-90th percentile
-18 to +3 dB
Recurring-pattern threshold
Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 16, moderate (-15 to -9 dB) 18, strong (≥ -8 dB) 31.

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 JM3OCJ 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 JM3OCJ

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
PM74 · 32 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,565 km (approx.)
Last such locator decoded
2026-08-22 13:15 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.

Time UTCBandJM3OCJ S/NCounterpartCounterpart S/NMsgsCapture
09-18 20:17 40m - / - PA3KUS -21 / - 2 Partial capture
09-18 20:16 40m - / - OZ1FHU +13 / - 5 Partial capture
09-18 20:15 40m - / -10 RW3ZC +2 / - 4 ✓ Closing fragment
09-18 20:13 40m - / -18 IV3UWA +11 / - 3 ✓ Closing fragment
09-18 20:07 40m - / -7 R7ZY +8 / - 6 ✓ Closing fragment
08-30 20:34 80m - / - UX1AA -3 / - 3 Partial capture
08-13 21:17 40m - / -18 EA3AAY -24 / - 2 Partial capture
08-13 20:58 40m - / -8 R3EDI -14 / - 2 ✓ Closing fragment
07-23 21:57 20m - / -17 EA5PG +9 / - 2 Partial capture
07-18 21:31 20m -13 / - OY1R - / - 2 ✓ Closing fragment
07-18 20:58 20m -16 / - EA5JYL - / -13 2 ✓ Closing fragment
07-18 20:55 20m -17 / -9 IW9HPG 0 / -4 3 ✓ Full exchange observed
07-18 20:46 20m - / -13 E77FN -3 / - 3 ✓ Closing fragment
07-18 20:41 20m - / -13 F4LUK -2 / - 3 ✓ Closing fragment
07-08 20:28 20m -15 / - SP0LPR - / -11 2 ✓ Closing fragment
07-08 20:26 20m -14 / -11 EB5AFK +3 / - 4 ✓ Closing observed
07-08 20:25 20m -14 / - SP9UPH - / -5 2 ✓ Closing fragment
07-08 20:22 20m -16 / - ON6AA - / -17 3 ✓ Closing fragment
07-08 20:18 20m -15 / - IH9YMC - / -4 2 Partial capture
07-07 20:44 20m - / - DG6VC -7 / - 2 Partial capture
07-07 20:38 20m - / - EA8ACW -5 / - 3 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

40m 
UTC    dB Audio  Message
201330  +0 2330  JM3OCJ IZ2BZP JN45
201330 +11 1964  JM3OCJ IV3UWA JN66 (x3)
201530  +1 2701  JM3OCJ RW3ZC -10 (x2)
201600 +15 3004  JM3OCJ OZ1FHU JO55
201630  +3 2701  JM3OCJ RW3ZC RR73
201630 +13 3004  JM3OCJ OZ1FHU JO55
201700  +7 2701  JM3OCJ RW3ZC RR73
201700  +7 3004  JM3OCJ OZ1FHU JO55
201730 -22 2234  JM3OCJ PA3KUS JO21
201730 +17 3004  JM3OCJ OZ1FHU JO55 (x2)
201830 -20 2234  JM3OCJ PA3KUS JO21
80m 
UTC    dB Audio  Message
203400  -5 1544  JM3OCJ UX1AA KO70 (x3)
20m 
UTC    dB Audio  Message
204700 -16 1228  JM3OCJ F4BJN JN25
204700  -3 1437  JM3OCJ E77FN 73
205245 -18 1227  EB3DIM JM3OCJ R-18
205545 -17 1227  IW9HPG JM3OCJ -04
205600  +0 1051  JM3OCJ IW9HPG R-09 (x2)
205715 -19 1227  EA5FQ JM3OCJ RR73
205845 -15 1227  EA5JYL JM3OCJ -13 (x2)
213145 -14 2524  OY1R JM3OCJ PM74 (x2)
215715  +8 2600  JM3OCJ EA5PG -17 (x2)
131545 -14 2637  YE5TA JM3OCJ PM74
131715 -16 2637  NE9U JM3OCJ RR73
10m 
UTC    dB Audio  Message
180045 +10 2765  JM3OCJ II2MPP JN45

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee