JK1EXO — 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: QM07

Receiver-side FT8 activity involving JK1EXO, decoded by SO8OO in southeastern Poland. 9 FT8 messages attributed to this token as transmitter, on 80m, 40m, across 3 UTC dates in the available aggregate history. Observed between 2026-08-27 and 2026-10-24.

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 9 FT8 messages attributed to JK1EXO as the transmitting token by decoded message structure across 3 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (78%), followed by 80 m (22%). In this small sample, the estimated median decoder S/N was -3 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-3 dB

Estimated median S/N

Bands

80m · 2 40m · 7

First attributed message: 2026-08-27
Last attributed message: 2026-10-24 21:23 UTC

Observed FT8 message patterns

Attributed sample: 9 messages
Active dates: 3 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) 1, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 6.

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 JK1EXO in decoded directed-looking exchanges:

OH0Z · Aland Islands PI4DX · Netherlands EA3EDU · Spain OV9A · Denmark TN8GD · Republic of the Congo OH1TSM · Finland

Most frequent locator attributed to JK1EXO

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: QM07 · 3 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,616 km (approx.)
Last such locator decoded: 2026-10-24 21:23 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	JK1EXO S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-29 21:39	80m	- / -18	OH1TSM	+4 / -	3	✓ Closing fragment
10-29 20:54	160m	- / -	OH1TSM	+8 / -	2	Partial capture
10-29 20:54	160m	- / -	SV8QG	-10 / -	2	Partial capture
10-29 20:53	160m	- / -13	OH0Z	-2 / -	2	✓ Closing fragment
10-29 20:49	160m	- / -	OH1TSM	+4 / -	3	Partial capture
10-24 21:47	40m	- / -	IW1FRD	-18 / -	4	Partial capture
10-23 22:19	40m	-10 / -	OV9A	- / -	2	✓ Closing fragment
10-23 22:00	40m	-2 / -	<...>	- / -24	4	Partial capture
10-02 21:09	40m	- / -18	EA3EDU	-9 / -	5	✓ Closing fragment
10-02 20:10	80m	- / -	TF2CT	-9 / -	2	Partial capture
09-21 17:21	80m	- / -	OH4BW	+14 / -	2	Partial capture
08-27 20:12	40m	- / -	G6PWS	-2 / -	9	Partial capture
08-27 20:10	40m	- / -	R7RCG	-2 / -	2	Partial capture

Recent FT8 messages decoded at SO8OO

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

80m

UTC    dB Audio  Message
172100 +12 3012  JK1EXO OH4BW KP32 (x2)
201030  -8 1557  JK1EXO TF2CT HP85 (x2)
203630  -8 1890  JK1EXO TF4M -17
203700  -5 1890  JK1EXO RR73; JI4WAO <...> -16
211445  -3 2925  S9R JK1EXO QM07 (x2)
212500  +5 1955  JK1EXO UW5KW -20
213915  +8 1149  JK1EXO OH1TSM KP11 (x3)

160m

UTC    dB Audio  Message
204915  +5  975  JK1EXO OH1TSM KP11 (x3)
205315  -1 1361  JK1EXO OH0Z -13 (x2)
205415 -10 2501  JK1EXO SV8QG KM39
205415  +8  658  JK1EXO OH1TSM KP11
205445  -9 2501  JK1EXO SV8QG KM39
205445  +7 1533  JK1EXO OH1TSM KP11
210215  +9 1859  JK1EXO PI4DX +00 (x2)

40m

UTC    dB Audio  Message
210930 -16 2054  JK1EXO EA3EDU JN01 (x5)
220015  -4 2910  <...> JK1EXO R-24 (x4)
221900 -10 2635  OV9A JK1EXO QM07 (x2)
214700 -17 2269  JK1EXO IW1FRD JN35 (x4)

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