F4JRK — 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: France Most frequent locator attributed to this token: JN07

Receiver-side FT8 activity involving F4JRK, decoded by SO8OO in southeastern Poland. 234 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 10 UTC dates in the available aggregate history. Observed between 2026-07-05 and 2026-11-02.

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 234 FT8 messages attributed to F4JRK as the transmitting token by decoded message structure across 10 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (53%), followed by 20 m (38%) and 80 m (5%). Several six-hour UTC windows tied for the largest share (94%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -8.5 dB.

Overview

234

Messages attributed

UTC dates decoded

Active 15-min windows

-8.5 dB

Estimated median S/N

Bands

80m · 12 60m · 7 40m · 124 20m · 90 10m · 1

First attributed message: 2026-07-05
Last attributed message: 2026-11-02 20:06 UTC

Observed FT8 message patterns

Attributed sample: 234 messages
Active dates: 10 UTC dates
Estimated median S/N: -8.5 dB
Estimated 10th-90th percentile: -15 to -1 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 100, strong (≥ -8 dB) 117.

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 F4JRK in decoded directed-looking exchanges:

F5HND · France SP3SXU · Poland DG3DAF · Fed. Rep. of Germany DL5JMN · Fed. Rep. of Germany E70SZ · Bosnia-Herzegovina EA4HTI · Spain IW2ODG · Italy IZ4AIF · Italy M0YFT · England SM0EJR · Sweden SP3IPA · Poland SP7TF · Poland

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to F4JRK

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: JN07 · 179 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,544 km (approx.)
Last such locator decoded: 2026-11-02 20:06 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	F4JRK S/N	Counterpart	Counterpart S/N	Msgs	Capture
11-02 19:38	60m	- / -	PE1NPS	+3 / -	4	Partial capture
11-02 19:27	60m	- / +2	DL6KA	-3 / -	2	✓ Closing fragment
11-02 19:25	60m	- / +5	OK1BN	-14 / -	3	✓ Closing fragment
11-02 19:04	80m	- / -	ON4ADA	-22 / -	2	✓ Closing fragment
11-02 18:51	80m	- / -22	IQ4JO	+7 / -	3	Partial capture
11-02 18:45	80m	- / -16	DO9ST	-11 / -	3	Partial capture
10-29 18:53	40m	- / -	UA4FKT	-3 / -	3	Partial capture
10-29 18:38	40m	- / -15	EA7AVH	-8 / -	2	Partial capture
10-29 18:34	40m	- / -	EA7AVH	-12 / -	3	Partial capture
10-28 20:26	40m	- / -	IK0CHU	+9 / -	3	Partial capture
10-28 20:04	40m	- / -	RW3DDZ	+2 / -	3	Partial capture
10-28 19:29	80m	-12 / -21	DO7MEW	-5 / -6	5	✓ Full exchange observed
10-28 19:26	80m	- / -	DO5PY	0 / -	5	Partial capture
10-27 20:06	40m	-6 / -	SP7TF	- / +3	4	✓ Closing fragment
10-27 20:00	40m	-3 / -	BG5JGG	- / -	11	Partial capture
10-27 19:56	40m	-5 / -	IU8UHK	- / -24	5	Partial capture
10-27 19:52	40m	- / -	EA1VJ	-10 / -	2	Partial capture
10-27 19:44	40m	-7 / -	EA4HTI	- / -13	3	✓ Closing fragment
10-27 19:41	40m	-12 / -	IN3JRZ	- / -	4	Partial capture
10-27 19:30	40m	-6 / -15	E70SZ	-8 / -20	5	✓ Full exchange observed
10-27 19:30	40m	-5 / 0	IW2ODG	-10 / 0	4	✓ Full exchange observed
10-27 19:27	40m	-7 / -	DL5JMN	- / +5	3	✓ Closing fragment
10-27 19:24	40m	-12 / -	EA4IFO	- / -5	2	Partial capture
10-27 19:22	40m	-12 / +5	IZ4AIF	+8 / +5	5	✓ Full exchange observed
10-27 19:18	40m	-15 / -2	M0YFT	-15 / +3	4	✓ Full exchange observed
10-27 19:14	40m	-14 / -	M0NXD	- / -4	2	Partial capture
10-27 19:11	40m	-13 / -7	SM0EJR	0 / -6	10	✓ Full exchange observed
10-27 19:03	40m	-17 / -10	DG3DAF	0 / 0	3	✓ Full exchange observed
08-30 20:44	20m	-6 / -	SP3SXU	- / -9	3	✓ Closing fragment
08-30 20:21	20m	-8 / -22	PY2GZ	-9 / -15	10	Partial capture
08-29 09:38	20m	- / -	R4FDK	-11 / -	3	Partial capture
08-23 19:31	20m	- / -	CT1BFP	+2 / -	12	Partial capture
08-23 19:29	20m	- / -12	BG7BMG	-9 / -	2	Partial capture
08-23 19:28	20m	- / -	DL1R	+1 / -	7	Partial capture
08-23 19:20	20m	+2 / -16	F5HND	+8 / -17	7	✓ Full exchange observed

Recent FT8 messages decoded at SO8OO

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

60m

UTC    dB Audio  Message
192715  -2  689  F4JRK DL6KA +02 (x2)
193815  +2 2428  F4JRK PE1NPS JO22
193815  -8  455  F4JRK EA5TT IM99
193845  +2 2428  F4JRK PE1NPS JO22 (x3)
194045 -14  804  F4JRK PA0LDE R-05
194130 -11 1733  CQ F4JRK JN07 (x7)

80m

UTC    dB Audio  Message
192930  -3  308  F4JRK DO7MEW JO42
192945 -12  307  DO7MEW F4JRK -06
193000  -5  308  F4JRK DO7MEW R-21
193015 -12  307  DO7MEW F4JRK RRR
193030  -8  309  F4JRK DO7MEW 73
193045 -13  306  CQ F4JRK JN07 (x2)
184545 -16 1700  F4JRK DO9ST JO30 (x3)
185115 +11 2567  F4JRK IQ4JO R-22 (x3)
190445 -23  471  F4JRK ON4ADA JO10 (x2)

40m

UTC    dB Audio  Message
182045 -10  969  CQ F4JRK JN07 (x5)
182600 -10  970  F4JRK UA4FEN -17
183345 -16  969  CQ F4JRK JN07
183430 -11  969  F4JRK EA7AVH (x5)
185330  -3  968  F4JRK UA4FKT LO23 (x3)

20m

UTC    dB Audio  Message
205245 -10 1270  CQ F4JRK JN07 (x15)

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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