DF8JK — 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: Fed. Rep. of Germany Most frequent locator attributed to this token: JO31

Receiver-side FT8 activity involving DF8JK, decoded by SO8OO in southeastern Poland. 48 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 8 UTC dates in the available aggregate history. Observed between 2026-07-25 and 2026-09-30.

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 48 FT8 messages attributed to DF8JK as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (81%), followed by 40 m (19%). Several six-hour UTC windows tied for the largest share (100%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -13 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

40m · 9 20m · 39

First attributed message: 2026-07-25
Last attributed message: 2026-09-30 08:51 UTC

Observed FT8 message patterns

Attributed sample: 48 messages
Active dates: 8 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -21 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 20, moderate (-15 to -9 dB) 11, strong (≥ -8 dB) 17.

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 DF8JK in decoded directed-looking exchanges:

F6HUK · France ×2 9A3TY · Croatia EA2DR · Spain EA2EWL · Spain EA7R · Spain F4LRB · France GJ0KYZ · Jersey OK1VM · Czech Republic 9A4ZM · Croatia 9A7BB · Croatia DK8MT · Fed. Rep. of Germany F1HFP · France

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 DF8JK

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: JO31 · 17 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,054 km (approx.)
Last such locator decoded: 2026-09-30 08:41 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	DF8JK S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-30 08:51	40m	-19 / -	DK8MT	- / -15	2	✓ Closing fragment
09-30 08:49	40m	- / -9	9A4ZM	-8 / -	3	✓ Closing fragment
09-30 08:43	40m	- / -	9A4ZM	-4 / -	2	Partial capture
09-30 08:41	40m	-20 / +1	F1HFP	-16 / -	6	✓ Full exchange observed
09-10 09:19	40m	-23 / -1	9A7BB	-16 / -	3	✓ Closing observed
09-10 09:12	40m	-20 / -	MW6IUT	- / -3	2	✓ Closing fragment
08-31 10:39	20m	+2 / -	RI1FJL	- / -8	2	Partial capture
08-31 10:34	20m	-5 / -4	OK1VM	+11 / -16	9	✓ Full exchange observed
08-31 08:59	20m	-4 / +2	F6HUK	-10 / -6	5	✓ Full exchange observed
08-27 10:31	20m	-16 / -	SP3DOF	- / -	2	Partial capture
08-27 10:29	20m	-7 / -	EA2DR	- / -7	3	✓ Closing fragment
08-27 10:27	20m	-11 / +3	EA7R	-15 / -4	5	✓ Full exchange observed
08-26 08:31	20m	-6 / -	9A3TY	- / -11	5	✓ Closing fragment
08-25 08:17	20m	-18 / -	EA2EWL	-12 / -	3	✓ Closing observed
08-21 10:01	20m	-20 / -	GJ0KYZ	-24 / +4	3	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
092000 -15 2110  DF8JK 9A7BB RR73
092015 -23 2110  9A7BB DF8JK 73
084115 -18 1866  F1HFP DF8JK JO31 (x2)
084200 -15 1866  DF8JK F1HFP +01
084215 -21 1866  F1HFP DF8JK R+16
084230 -18 1866  DF8JK F1HFP RR73
084245 -18 1866  F1HFP DF8JK 73
084300  -4 1862  DF8JK 9A4ZM JN86 (x5)
085115 -18 1758  DK8MT DF8JK R-15 (x2)

20m

UTC    dB Audio  Message
090000  -4 1133  F6HUK DF8JK 73
090400  -5  999  F4CQS DF8JK JO31
100230 -13 2258  RW6AVK DF8JK JO31
102815  -9 1783  UA3IDQ DF8JK R-15
103415 +12 2163  DF8JK OK1VM -04
103430  -5 2163  OK1VM DF8JK R-16
103445 +13 2163  DF8JK OK1VM -04 (x3)
103600  -1 2163  OK1VM DF8JK R-13
103615 +16 2163  DF8JK OK1VM -04 (x2)
103700 -10 2250  OK1VM DF8JK R-17
103945  +3  545  RI1FJL DF8JK R-08 (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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