F4JDM — 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 F4JDM, decoded by SO8OO in southeastern Poland. 383 FT8 messages attributed to this token as transmitter, on 40m, 20m, 10m, across 10 UTC dates in the available aggregate history. Observed between 2026-06-19 and 2026-10-17.

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 383 FT8 messages attributed to F4JDM 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 (77%), followed by 20 m (17%) and 10 m (5%). Most decodes (95%) 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 (92%); the estimated median was 0 dB.

Overview

383

Messages attributed

UTC dates decoded

Active 15-min windows

0 dB

Estimated median S/N

Bands

40m · 296 20m · 66 10m · 21

First attributed message: 2026-06-19
Last attributed message: 2026-10-17 21:44 UTC

Observed FT8 message patterns

Attributed sample: 383 messages
Active dates: 10 UTC dates
Estimated median S/N: 0 dB
Estimated 10th-90th percentile: -8 to +8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 12, moderate (-15 to -9 dB) 19, strong (≥ -8 dB) 352.

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 F4JDM in decoded directed-looking exchanges:

CE3KLH · Chile CR7BRV · Portugal EA5HND · Spain HJ1BNL · Colombia TA2ED · Asiatic Turkey YY5CDT · Venezuela A61QQ · United Arab Emirates 9Z4CT · Trinidad & Tobago BA3QIQ · China BG0FQU · China CT7ARQ · Portugal DB4KBR · Fed. Rep. of Germany

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 F4JDM

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 · 187 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,544 km (approx.)
Last such locator decoded: 2026-10-17 21:44 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	F4JDM S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-24 09:26	10m	- / -13	RT8T	-12 / -	3	Partial capture
10-17 21:43	40m	+8 / -	DL9FFM	- / -9	2	✓ Closing fragment
10-17 21:41	40m	+5 / -8	UA9SY	-22 / -15	4	✓ Full exchange observed
10-17 21:40	40m	+3 / -	8P6ET	- / -	2	Partial capture
10-17 21:36	40m	+8 / -	PD4RJ	- / -13	2	✓ Closing fragment
10-17 21:34	40m	+9 / -	UA9SY	-11 / -17	2	Partial capture
10-17 21:33	40m	+8 / -	PY5QW	- / -20	2	✓ Closing fragment
10-17 16:48	10m	-20 / -	LW2HAH	- / -	3	Partial capture
10-17 16:42	10m	-16 / -	CX9AU	- / -	2	Partial capture
10-17 16:25	10m	- / -7	CR7BRV	-6 / -	2	✓ Closing fragment
10-03 22:05	40m	+3 / -	XV9B	- / -	2	Partial capture
10-03 22:01	40m	+3 / -	FG4AO	- / -9	10	Partial capture
10-03 21:59	40m	+1 / -	OH2FZV	- / -14	2	✓ Closing fragment
10-03 21:56	40m	+2 / -	9Z4CT	- / -15	5	✓ Closing fragment
10-03 21:53	40m	+3 / -	9H1SR	- / -	2	Partial capture
10-03 21:49	40m	-1 / -	BG5GFU	- / -18	2	Partial capture
10-03 21:45	40m	+2 / -	SQ3MQD	- / -6	3	✓ Closing fragment
10-03 21:42	40m	+5 / -	JH5LCN	- / -17	2	✓ Closing fragment
10-01 18:56	40m	+4 / -	F4HSB	-15 / -4	5	✓ Full exchange observed
10-01 18:54	40m	+4 / -	SQ8AA	- / 0	2	✓ Closing fragment
10-01 18:50	40m	+5 / -12	IK1MJK	-14 / +3	5	✓ Full exchange observed
10-01 18:42	40m	+1 / -	SN6R	- / -12	2	✓ Closing fragment
10-01 18:40	40m	+4 / -	PA8DC	- / +4	2	✓ Closing fragment
09-12 21:15	40m	+2 / -	DS5USH	- / -17	3	✓ Closing fragment
09-12 21:12	40m	+2 / -1	ON1DGN	-8 / -	4	✓ Full exchange observed
09-12 21:10	40m	-1 / -	BG2GWN	- / -	3	Partial capture
09-12 20:28	40m	+4 / -	M7GOA	- / -23	2	✓ Closing fragment
09-12 20:20	40m	-3 / -	JH0MXV	- / -	3	Partial capture
09-12 20:18	40m	+1 / -	UA4CKN	-4 / -17	2	✓ Closing observed
09-12 20:13	40m	-2 / -14	R3UDU	-13 / -9	6	✓ Full exchange observed
09-12 20:12	40m	-2 / -	R2FDP	- / -6	5	✓ Closing fragment
09-12 20:11	40m	+4 / +7	M9NTS	-14 / 0	3	Partial capture
09-11 21:22	40m	0 / -	HL3KPJ	- / -	3	Partial capture
09-11 21:16	40m	-2 / -	YL3NU	- / +1	2	✓ Closing fragment
09-11 21:16	40m	- / -	R3UDU	-14 / -	2	Partial capture
09-11 21:12	40m	-6 / +4	MW7RHR	-12 / +3	7	✓ Full exchange observed
09-11 21:07	40m	-7 / -	EA1AGM	-20 / -17	6	✓ Closing observed
09-11 21:02	40m	-6 / 0	DB4KBR	-4 / +8	4	✓ Full exchange observed
09-11 21:00	40m	- / -	MW7RHR	-13 / -	3	Partial capture
09-11 20:58	40m	-8 / -	UA2FFD	- / -3	2	✓ Closing fragment
09-11 20:54	40m	-3 / -	HL3KPJ	- / -	2	Partial capture
09-11 20:52	40m	-7 / -	VK5COL	- / -19	4	✓ Closing fragment
09-11 20:50	40m	-6 / -5	DL5FCE	-10 / -16	5	✓ Full exchange observed
09-11 20:47	40m	-4 / -	BA3QIQ	- / -16	5	✓ Closing fragment
09-11 20:45	40m	-6 / -	LB5WB	- / -11	2	✓ Closing fragment
09-11 20:44	40m	-4 / -	BG4OOO	- / -25	2	Partial capture
09-11 20:42	40m	0 / -	BA3QIQ	- / -15	3	Partial capture
09-11 20:37	40m	-4 / -	VJ6X	- / -14	5	✓ Closing fragment
09-11 20:36	40m	-2 / -	BG0FQU	- / -14	2	✓ Closing fragment
09-11 20:34	40m	0 / -	JF1UVJ	- / -15	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

10m

UTC    dB Audio  Message
162515  -5  892  F4JDM CR7BRV -07 (x2)
164115 -20 2056  CE3KLH F4JDM 73
164230 -16 2056  CX9AU F4JDM JN07 (x2)
164800 -20 2056  LW2HAH F4JDM JN07 (x3)
165100 -21 2056  HJ1BNL F4JDM 73
165245 -22 2057  YY5CDT F4JDM 73
172715 -20 2056  EA5HND F4JDM RR73
092630 -16 2019  F4JDM RT8T LO71 (x3)
095100 -21 1986  F4JDM RU9CZ MO06

40m

UTC    dB Audio  Message
213630  +9 2022  PD4RJ F4JDM RR73
213700  +5 2022  CQ DX F4JDM JN07
213800  +3 2022  BH3FZG F4JDM JN07
213830  +4 2022  CQ DX F4JDM JN07 (x3)
214000  +6 2022  8P6ET F4JDM JN07 (x2)
214100  +4 2022  UA9SY F4JDM -15 (x2)
214145 -22 2025  F4JDM UA9SY R-08
214200  +6 2022  UA9SY F4JDM RR73
214300  +8 2022  DL9FFM F4JDM -09 (x2)
214400  +5 2022  8P6ET F4JDM JN07

80m

UTC    dB Audio  Message
205215 -17 1428  F4JDM CT3HU -07

20m

UTC    dB Audio  Message
201800  -1  557  F4JDM A61QQ -15 (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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