JA3USA — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: Japan

Receiver-side FT8 activity involving JA3USA, decoded by SO8OO in southeastern Poland. 19 FT8 messages attributed to this token as transmitter, on 10m, across 1 UTC dates in the available aggregate history. Last observed 2026-11-07.

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 19 FT8 messages attributed to JA3USA as the transmitting token by decoded message structure across 1 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (100%). In this small sample, the estimated median decoder S/N was +3 dB; no usual signal pattern is inferred.

Overview

19
Messages attributed
1
UTC dates decoded
2
Active 15-min windows
+3 dB
Estimated median S/N

Bands

10m · 19
First attributed message: 2026-11-07
Last attributed message: 2026-11-07 08:07 UTC

Observed FT8 message patterns

Attributed sample
19 messages
Active dates
1 UTC dates
Estimated median S/N
+3 dB
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 0, strong (≥ -8 dB) 19.

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 JA3USA in decoded directed-looking exchanges:

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 UTCBandJA3USA S/NCounterpartCounterpart S/NMsgsCapture
11-07 08:07 10m -7 / - 4O7CC - / -24 2 Partial capture
11-07 08:02 10m +4 / - CT2ECS -4 / -12 4 ✓ Closing observed
11-07 08:00 10m +6 / - LZ2VQ - / -18 2 Partial capture
11-07 07:59 10m +6 / - RV6HE - / -9 2 ✓ Closing fragment
11-07 07:58 10m +4 / - Z32BM - / -6 3 ✓ Closing fragment
11-07 07:57 10m +2 / - SV1GYN - / -24 2 ✓ Closing fragment
11-07 07:55 10m -3 / - SV5AZK - / -14 4 ✓ Closing fragment
10-31 21:20 160m - / -19 SP9MRO +2 / - 3 Partial capture
10-31 20:04 80m - / -10 E79D +24 / - 2 ✓ Closing fragment
10-30 20:11 160m - / -20 SV1BLD +1 / - 3 ✓ Closing fragment
10-30 20:10 160m - / - LZ3AW -18 / - 2 Partial capture
10-30 20:10 160m - / - SV1DKR -18 / - 2 Partial capture
10-30 20:09 160m - / -16 EW4M +20 / - 3 ✓ Closing fragment
10-30 20:07 160m - / - RV6AVU -3 / - 3 Partial capture
10-30 20:07 160m - / -12 RZ3DX +3 / - 2 ✓ Closing fragment
10-30 20:06 160m - / -16 F5BZB +5 / - 3 Partial capture
10-30 20:06 160m - / - RX3DTN -15 / - 12 Partial capture
10-30 20:02 160m - / -10 SV8DCY -2 / - 4 ✓ Closing fragment
10-30 20:01 160m - / -13 SV9ANK -17 / - 3 ✓ Closing fragment
10-30 19:57 160m - / - RV6AVU -2 / - 2 Partial capture
10-30 19:55 160m - / -6 RN3TT +2 / - 2 Partial capture
10-30 19:55 160m - / -16 F5BZB +16 / - 3 Partial capture
10-30 19:52 160m - / - EW6FL -2 / - 6 Partial capture
10-30 19:52 160m - / - SV8JNR -16 / - 4 Partial capture
10-30 19:51 160m - / - RX3DTN -14 / - 2 Partial capture
10-30 19:50 160m - / -23 R6DAZ -13 / - 4 ✓ Closing fragment
10-30 19:49 160m - / -10 IT9GSF 0 / - 4 ✓ Closing fragment
10-30 19:49 160m - / - RU3OZ -20 / - 2 Partial capture
10-30 19:48 160m - / -14 IK0PHY -2 / - 10 ✓ Closing fragment
10-30 19:47 160m - / -13 OH4MFA +7 / - 5 Partial capture
10-30 19:45 160m - / -11 UA3LID 0 / - 16 ✓ Closing fragment
10-30 19:44 160m - / - IK0PHY -9 / - 3 Partial capture
10-30 19:44 160m - / -12 IW4AOT -5 / - 2 ✓ Closing fragment
10-30 19:44 160m - / -11 RA3SI -12 / - 6 Partial capture
10-30 19:43 160m - / -13 UT7UA +15 / - 9 ✓ Closing fragment
10-30 19:42 160m - / - EW6FL +2 / - 13 Partial capture
09-04 14:42 40m - / -7 RA3ZH 0 / - 5 ✓ Closing fragment
09-04 14:14 40m - / - UY5AX -8 / - 2 Partial capture

Recent FT8 messages decoded at SO8OO

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

10m 
UTC    dB Audio  Message
075700  +1 2728  SV1GYN JA3USA -24 (x2)
075800  +4 2728  Z32BM JA3USA -06 (x3)
075930  +6 2728  RV6HE JA3USA R-09 (x2)
080030  +6 2728  LZ2VQ JA3USA -18 (x2)
080215  +6 2728  CT2ECS JA3USA -12 (x3)
080330  -4 2535  JA3USA CT2ECS 73
080715  -7 2728  4O7CC JA3USA -24 (x2)
160m 
UTC    dB Audio  Message
201115 -18 1388  JA3USA SV1DKR KM18
201115  -1 2448  JA3USA SV1BLD KM17
201115 -24 1609  JA3USA RX3DTN KO85
201115 -17 1481  JA3USA LZ3AW KN32
201145  +0 2448  JA3USA SV1BLD R-20 (x2)
201215  -9  710  JA3USA RX3DTN KO85 (x4)
202215 -19  962  JA3USA SV1DKR KM18
202345  -9  633  JA3USA RV6AVU KN94
212000  +7 1057  JA3USA SP9MRO -19 (x3)
80m 
UTC    dB Audio  Message
200430 +24 2803  JA3USA E79D -10 (x2)
40m 
UTC    dB Audio  Message
141430  -7 1074  JA3USA UY5AX KO70 (x2)
144230  +2  669  JA3USA RA3ZH KO81 (x5)

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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