JR3JFZ — 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: PM74

Receiver-side FT8 activity involving JR3JFZ, decoded by SO8OO in southeastern Poland. 8 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 3 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-30.

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 8 FT8 messages attributed to JR3JFZ 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 (63%), followed by 20 m (38%). In this small sample, the estimated median decoder S/N was -12 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-12 dB

Estimated median S/N

Bands

40m · 5 20m · 3

First attributed message: 2026-06-06
Last attributed message: 2026-10-30 18:54 UTC

Observed FT8 message patterns

Attributed sample: 8 messages
Active dates: 3 UTC dates
Estimated median S/N: -12 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) 5, strong (≥ -8 dB) 2.

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 JR3JFZ in decoded directed-looking exchanges:

CN8WK · Morocco CN8NS · Morocco EI4KF · Ireland 7X2RF · Algeria EA3NE · Spain ON7NQ · Belgium R4HGP · European Russia TA1MB · European Turkey UX0CZ · Ukraine

Most frequent locator attributed to JR3JFZ

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 · 4 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,565 km (approx.)
Last such locator decoded: 2026-10-30 18:50 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	JR3JFZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-30 19:13	40m	- / -9	7X2RF	-2 / -	2	✓ Closing fragment
10-30 19:02	40m	- / -18	EA3NE	-3 / -	2	✓ Closing fragment
10-30 19:01	40m	- / -	UB6OCP	+2 / -	2	Partial capture
10-30 18:55	40m	- / -8	R2BQM	+2 / -	3	Partial capture
10-30 18:55	40m	- / -9	UX0CZ	+6 / -	5	✓ Closing fragment
10-30 18:51	40m	- / -	UB6OCP	-5 / -	10	Partial capture
10-23 20:39	40m	- / -	EA2FBG	+8 / -	2	Partial capture
10-13 20:17	40m	- / -	MI7XHT	-8 / -	3	Partial capture
10-13 20:15	40m	- / -13	ON7NQ	+15 / -	4	✓ Closing fragment
10-02 21:23	40m	- / -	RN6HK	+9 / -	2	Partial capture
09-25 20:27	40m	- / -10	4O4DB	-12 / -	3	Partial capture
08-10 20:28	20m	- / -	CN8NS	-12 / -	2	✓ Closing fragment
08-10 19:13	20m	- / -18	EI4KF	+4 / -	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
185600  -3 2022  JR3JFZ UB6OCP KN88
185600  +0 2614  JR3JFZ R2BQM -08 (x2)
185700  +5 2613  JR3JFZ UX0CZ KN59
185700  +1 2022  JR3JFZ UB6OCP KN88
185730  +3 2612  JR3JFZ UX0CZ KN59
185730  -4 2022  JR3JFZ UB6OCP KN88
185830  +7 2614  JR3JFZ UX0CZ R-09 (x2)
190130  -1 2023  JR3JFZ UB6OCP KN88 (x2)
190200  -3 2610  JR3JFZ EA3NE -18 (x2)
191315  -1  430  JR3JFZ 7X2RF -09 (x2)

10m

UTC    dB Audio  Message
095500 -14 2434  JR3JFZ CN8WK RR73

20m

UTC    dB Audio  Message
191330  +3 2725  JR3JFZ EI4KF -18 (x2)
202830 -12  792  JR3JFZ CN8NS RR73 (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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