PD3JMK — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Netherlands Most frequent locator attributed to this token: JO21

Receiver-side FT8 activity involving PD3JMK, decoded by SO8OO in southeastern Poland. 25 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-08-08 and 2026-08-28.

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 25 FT8 messages attributed to PD3JMK as the transmitting token by decoded message structure across 5 UTC dates in the available aggregate history. The largest monitored-band total was 20 m (96%), followed by 40 m (4%). Several six-hour UTC windows tied for the largest share (56%), so no unique busiest interval is claimed. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -11 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-11 dB

Estimated median S/N

Bands

40m · 1 20m · 24

First attributed message: 2026-08-08
Last attributed message: 2026-08-28 19:13 UTC

Observed FT8 message patterns

Attributed sample: 25 messages
Active dates: 5 UTC dates
Estimated median S/N: -11 dB
Estimated 10th-90th percentile: -24 to +8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 7, moderate (-15 to -9 dB) 8, strong (≥ -8 dB) 10.

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 PD3JMK in decoded directed-looking exchanges:

IK4LZH · Italy F1PBZ · France IW4CSQ · Italy TF5B · Iceland

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 PD3JMK

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: JO21 · 12 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,192 km (approx.)
Last such locator decoded: 2026-08-28 19:10 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	PD3JMK S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-28 19:10	20m	-2 / -	IW4CSQ	- / -8	6	✓ Closing fragment
08-28 19:07	20m	+8 / -	W1AW/2	- / -	4	Partial capture
08-27 21:24	20m	-12 / -	AD9GE	- / -14	2	Partial capture
08-12 12:18	10m	- / -	IZ3EAW	-3 / -	8	Partial capture
08-12 12:15	10m	- / -24	IK4LZH	+7 / -	2	✓ Closing fragment
08-12 10:41	20m	-23 / -	TF5B	- / -11	3	✓ Closing fragment
08-12 10:36	20m	- / -7	F1PBZ	-6 / -	3	✓ Closing fragment
08-12 10:34	20m	-11 / -	F4BYA/P	- / -20	2	Partial capture
08-09 11:07	20m	-14 / -	A61QQ	- / -19	2	Partial capture
08-09 10:37	20m	-24 / -	TF5B	- / -	2	Partial capture
08-08 13:11	40m	- / -	DF3NK	-22 / -	3	Partial capture

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
104200 -23 1770  TF5B PD3JMK R-11 (x2)
205615 -14  632  8Z1IT PD3JMK JO21
212430 -13 2069  AD9GE PD3JMK JO21 (x2)
190700  +8  600  W1AW/2 PD3JMK JO21 (x4)
191015  -3 1567  IW4CSQ PD3JMK JO21 (x6)

10m

UTC    dB Audio  Message
121515 +10  490  PD3JMK IK4LZH -24 (x2)
121815  -3 1139  PD3JMK IZ3EAW JN55 (x8)

40m

UTC    dB Audio  Message
131130 -22 1645  PD3JMK DF3NK JO60 (x3)
201315 -18  906  CT7AIU PD3JMK JO21

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.

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