JA3KGF — 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: PM84

Receiver-side FT8 activity involving JA3KGF, decoded by SO8OO in southeastern Poland. 26 FT8 messages attributed to this token as transmitter, on 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-17 and 2026-08-30.

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 26 FT8 messages attributed to JA3KGF as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (100%). Several six-hour UTC windows tied for the largest share (92%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (92%); the estimated median was +3 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

+3 dB

Estimated median S/N

Bands

20m · 26

First attributed message: 2026-06-17
Last attributed message: 2026-08-30 15:57 UTC

Observed FT8 message patterns

Attributed sample: 26 messages
Active dates: 3 UTC dates
Estimated median S/N: +3 dB
Estimated 10th-90th percentile: -4 to +7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 0, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 24.

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 JA3KGF in decoded directed-looking exchanges:

DK0SD · Fed. Rep. of Germany A92AE · Bahrain F6EKI · France I4WQH · Italy IU5VMV · Italy M0LAD · England OH3OJ · Finland ON4AOI · Belgium ON4CJU · Belgium RC1C · European Russia SP5WZ · Poland UX1VT · Ukraine

Most frequent locator attributed to JA3KGF

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: PM84 · 4 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,675 km (approx.)
Last such locator decoded: 2026-08-30 15:43 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 UTC	Band	JA3KGF S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-19 22:45	40m	- / -25	DL3MIB	+2 / -	3	✓ Closing fragment
09-27 22:03	40m	- / -17	RZ4FWA	-18 / -	2	Partial capture
09-20 17:25	160m	- / -	RN1CW	-12 / -	3	Partial capture
08-30 15:57	20m	+6 / -	OH3OJ	- / -5	2	✓ Closing fragment
08-30 15:56	20m	+2 / -	IU5VMV	-14 / -13	3	✓ Closing observed
08-30 15:54	20m	+4 / -16	I4WQH	0 / -5	6	✓ Full exchange observed
08-30 15:53	20m	+5 / -	YO8CHF	- / -14	2	Partial capture
08-30 15:51	20m	+6 / -	YU4RBL	- / -19	3	✓ Closing fragment
08-30 15:50	20m	+4 / +6	F6EKI	+15 / -8	7	✓ Full exchange observed
08-30 15:49	20m	+2 / -	SP5WZ	- / -1	2	✓ Closing fragment
08-30 15:48	20m	0 / -	RC1C	- / -11	2	✓ Closing fragment
08-30 15:47	20m	- / -8	UA1RC	-7 / -	2	Partial capture
08-30 15:46	20m	+3 / -5	ON4CJU	-8 / -	2	✓ Closing observed
08-30 15:44	20m	+8 / -19	M0LAD	+9 / -	5	✓ Closing observed
08-30 15:42	20m	+4 / -	<...>	- / -12	3	Partial capture
08-22 09:44	10m	- / +3	DK0SD	-12 / -	2	✓ Closing fragment
08-20 22:18	20m	- / -12	UX1VT	-14 / -	3	✓ Closing fragment
08-20 22:17	20m	- / -18	A92AE	-8 / -	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
220100  -7  345  JA3KGF RA4FUT LO23
220300 -19 2028  JA3KGF RZ4FWA LO23 (x2)
224530  +2 1070  JA3KGF DL3MIB JN57 (x3)

160m

UTC    dB Audio  Message
172530 -10 1290  JA3KGF RN1CW KO59 (x3)

20m

UTC    dB Audio  Message
155345  +3  326  YO8CHF JA3KGF -14
155400 -12  495  JA3KGF IU5VMV +04
155430  -1  326  JA3KGF I4WQH JN54 (x2)
155515  +7  326  I4WQH JA3KGF -05
155530  -4  327  JA3KGF I4WQH R-16
155545  +2  326  I4WQH JA3KGF RR73
155600  +3  326  JA3KGF I4WQH 73
155615  +0  326  IU5VMV JA3KGF R-13
155630 -14  496  JA3KGF IU5VMV RR73
155645  +5  326  IU5VMV JA3KGF 73
155700 +20  326  JA3KGF G4UJS -09
155700 -18 2332  JA3KGF BG7BMG +00
155715  +7  326  OH3OJ JA3KGF R-05 (x2)

10m

UTC    dB Audio  Message
094445 -12 1502  JA3KGF DK0SD R+03 (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

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