JR4BCD — 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: PM54

Receiver-side FT8 activity involving JR4BCD, decoded by SO8OO in southeastern Poland. 60 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-12 and 2026-09-22.

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 60 FT8 messages attributed to JR4BCD as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (90%), followed by 40 m (10%). Most decodes (100%) fell within the six-hour window 17:00-23:00 UTC. Most successfully decoded messages attributed to this token fell in SO8OO's strong S/N range (83%); the estimated median was -1 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-1 dB

Estimated median S/N

Bands

40m · 6 20m · 54

First attributed message: 2026-06-12
Last attributed message: 2026-09-22 18:53 UTC

Observed FT8 message patterns

Attributed sample: 60 messages
Active dates: 10 UTC dates
Estimated median S/N: -1 dB
Estimated 10th-90th percentile: -12 to +7 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2, moderate (-15 to -9 dB) 8, strong (≥ -8 dB) 50.

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 JR4BCD in decoded directed-looking exchanges:

EA3FCQ · Spain LB7ZG · Norway 4O4A · Montenegro CN8WK · Morocco V51WH · Namibia

Most frequent locator attributed to JR4BCD

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: PM54 · 50 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 8,339 km (approx.)
Last such locator decoded: 2026-09-22 18:53 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	JR4BCD S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-30 20:48	80m	- / -19	4O4A	+19 / -	2	✓ Closing fragment
10-16 21:24	40m	- / -	HB9ELE	+5 / -	2	Partial capture
10-16 21:24	40m	- / -	UR9QQ	-7 / -	4	Partial capture
10-12 15:51	80m	- / -	PA0O	-12 / -	2	Partial capture
10-12 15:50	80m	- / -18	RQ4F	-16 / -	2	Partial capture
10-02 21:04	80m	- / -	ON6AA	+9 / -	5	Partial capture
09-23 20:54	80m	- / -13	CN8WK	-10 / -	2	✓ Closing fragment
09-13 18:59	40m	- / -20	EA3FCQ	-2 / -	6	✓ Closing fragment
09-13 18:58	40m	- / -13	LB7ZG	+8 / -	3	✓ Closing fragment
09-06 19:27	40m	- / -14	IT9PHU	-18 / -	3	Partial capture
09-06 19:15	40m	-7 / -	9H4JX	- / -	3	Partial capture
09-06 19:07	80m	- / -	OH4BW	+6 / -	2	Partial capture
09-02 21:03	80m	- / -5	V51WH	-10 / -	2	✓ Closing fragment
09-02 20:54	40m	- / -	F5PBG	-8 / -	4	Partial capture
09-02 20:54	40m	- / -	G1CEC	-7 / -	5	Partial capture
09-02 20:53	40m	-21 / -	C31KC	- / -	2	Partial capture
08-27 10:18	10m	- / -	EB3JT	-6 / -	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
205445 -13 2370  JR4BCD CN8WK -13 (x2)
210430 +11 2168  JR4BCD ON6AA JO11 (x2)
210530  -5 1890  JR4BCD TF4M -21
210530  +8 2168  JR4BCD ON6AA JO11
210600  -6 1891  JR4BCD RR73; SA6BZZ <...> +02
210600  +8 2168  JR4BCD ON6AA JO11 (x2)
155045 -17 1264  JR4BCD RQ4F -18 (x2)
155115 -17  816  JR4BCD PA0O JO33 (x2)
204800 +18 2636  JR4BCD 4O4A -19 (x2)

40m

UTC    dB Audio  Message
185900  +5 2731  JR4BCD LB7ZG 73
185900  +5 2691  JR4BCD EA3FCQ JN01 (x6)
220900 -14  897  JR4BCD UR1CCT KN69
185345 -11 2920  9H4JX JR4BCD PM54
212415  -8 2917  JR4BCD UR9QQ KN77
212415  +6  791  JR4BCD HB9ELE JN47
212445  -7 2916  JR4BCD UR9QQ KN77
212445  +4  791  JR4BCD HB9ELE JN47
212515  -6 2917  JR4BCD UR9QQ KN77 (x2)

10m

UTC    dB Audio  Message
101830  -6 2814  JR4BCD EB3JT JN01 (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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