JA4DWR — 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 Most frequent locator attributed to this token: PM63

Receiver-side FT8 activity involving JA4DWR, decoded by SO8OO in southeastern Poland. 18 FT8 messages attributed to this token as transmitter, on 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-06-23 and 2026-08-07.

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 18 FT8 messages attributed to JA4DWR as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). In this small sample, the estimated median decoder S/N was -15 dB; no usual signal pattern is inferred.

Overview

18
Messages attributed
5
UTC dates decoded
10
Active 15-min windows
-15 dB
Estimated median S/N

Bands

20m · 18
First attributed message: 2026-06-23
Last attributed message: 2026-08-07 20:47 UTC

Observed FT8 message patterns

Attributed sample
18 messages
Active dates
5 UTC dates
Estimated median S/N
-15 dB
S/N percentile sample
Too small
Recurring-pattern threshold
Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 8, moderate (-15 to -9 dB) 10, strong (≥ -8 dB) 0.

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 JA4DWR in decoded directed-looking exchanges:

Most frequent locator attributed to JA4DWR

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
PM63 · 15 decoded messages
SO8OO receiver locator
KN09VW
Locator-centre separation
8,540 km (approx.)
Last such locator decoded
2026-08-07 20:47 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 UTCBandJA4DWR S/NCounterpartCounterpart S/NMsgsCapture
10-18 20:08 40m - / -13 LA8ENA -15 / - 3 ✓ Closing fragment
10-12 20:19 40m - / -11 OE3PBS -6 / - 2 ✓ Closing fragment
10-06 20:34 40m - / -25 PI4DX -6 / - 3 ✓ Closing fragment
09-20 17:42 160m - / -23 UW5ZM +22 / - 4 ✓ Closing fragment
09-03 19:30 40m - / - YO4GIY -7 / - 2 ✓ Closing fragment
09-01 20:58 40m - / -12 D2ACE -14 / - 2 ✓ Closing fragment
08-31 21:37 40m - / -22 HA9PP -22 / - 2 Partial capture
08-28 08:06 10m - / -19 A92GE -4 / - 2 ✓ Closing fragment
08-27 08:47 10m - / -11 IS0AWZ -6 / - 2 ✓ Closing fragment
08-23 18:12 40m - / -14 OZ1KEF +8 / - 3 ✓ Closing fragment
08-23 13:29 10m - / -18 DM2DXA -20 / - 3 Partial capture
08-23 13:26 10m - / -11 ON4IQ -2 / - 2 ✓ Closing fragment
08-22 21:21 40m - / -13 UR1CCT +21 / - 3 ✓ Closing fragment
08-21 20:34 40m - / -19 ON4IQ +17 / - 7 ✓ Closing fragment
08-17 23:13 20m - / -17 CT3MD -2 / - 2 ✓ Closing fragment
08-17 21:00 40m - / -7 SP8NR -12 / - 2 ✓ Closing fragment
08-17 20:58 40m - / -9 ER1CW -17 / - 3 Partial capture
08-11 18:59 40m - / -19 EA7ALL -12 / - 4 ✓ Closing fragment
08-11 18:08 40m - / -25 SV7BAY -9 / - 3 Partial capture
08-11 18:02 40m - / -14 9A5E -4 / - 2 ✓ Closing fragment
08-11 17:51 40m - / -18 EU4U -5 / - 4 ✓ Closing fragment
08-11 17:32 20m - / -1 ER3CT -19 / - 4 Partial capture
08-07 20:47 20m -15 / - MI0JZZ -14 / - 2 ✓ Closing observed
08-07 20:31 20m - / -22 EA7EZ -11 / - 3 ✓ Closing fragment
08-07 07:31 20m - / -12 P40AA -5 / - 2 Partial capture
08-05 21:44 20m - / -8 7X5CY +3 / - 2 ✓ Closing fragment
08-05 15:47 20m - / -18 GM3DRA -6 / - 2 ✓ Closing fragment
08-02 20:53 40m - / -24 HG2DX -11 / - 3 Partial capture
08-02 13:56 10m - / -11 EA8UP -2 / - 2 ✓ Closing fragment
07-31 21:35 20m - / - EA5BLP -1 / - 3 Partial capture
07-28 06:18 20m - / -15 V31MA -13 / - 4 Partial capture
07-26 21:15 40m - / -6 A71UN -18 / - 4 ✓ Closing fragment
07-26 19:31 20m - / -6 OS4K -4 / - 4 Partial capture
07-26 19:23 20m - / - M8KUG -11 / - 2 Partial capture
07-26 19:19 20m -24 / - UX4LX - / -6 2 Partial capture
07-26 19:10 20m - / -1 CS8ABF -6 / - 2 ✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m 
UTC    dB Audio  Message
213745 -24 2053  JA4DWR HA9PP -22
204000 -11 1583  JA4DWR CT7AIU -25
205830 -16 2338  JA4DWR D2ACE -12 (x2)
193015  -6 1288  JA4DWR YO4GIY RR73 (x2)
203415  -7 1934  JA4DWR PI4DX -25 (x3)
204215  +1  945  JA4DWR DL4ME -16
201945  -2 1966  JA4DWR OE3PBS -11 (x2)
200845 -15 2171  JA4DWR LA8ENA -13 (x3)
160m 
UTC    dB Audio  Message
174245 +23  343  JA4DWR UW5ZM KN57 (x4)
10m 
UTC    dB Audio  Message
135645  -2 1781  JA4DWR EA8UP -11 (x2)
132615  +0 2599  JA4DWR ON4IQ -11 (x2)
132945 -21 1839  JA4DWR DM2DXA -18 (x3)
084715  -4 1388  JA4DWR IS0AWZ -11 (x2)
111530 -24 1845  JA4DWR F5MXH JN07
112845  +0 2678  JA4DWR HB9EFK -19
080615  -3  521  JA4DWR A92GE -19 (x2)
112000  -8 2812  JA4DWR PG9S JO32
112130  +8 2927  JA4DWR DF6QN JO41
20m 
UTC    dB Audio  Message
203115 -14 1266  JA4DWR EA7EZ IM76 (x3)
204215 -13 1832  JA4DWR DJ8GS JO53
204430 -14  832  EA6TU JA4DWR PM63
204745 -15  832  MI0JZZ JA4DWR PM63
204830 -14 2492  JA4DWR MI0JZZ RR73
201945 -17 1914  JA4DWR MW3LSD RR73
173245 -18 1829  JA4DWR ER3CT KN47 (x4)
173545 -13 1445  JA4DWR EA5HEU JN00
231315  -1  719  JA4DWR CT3MD -17 (x2)

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.

CW

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

Explore CW reception at SO8OO

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