DF4FW — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO43

Receiver-side FT8 activity involving DF4FW, decoded by SO8OO in southeastern Poland. 52 FT8 messages attributed to this token as transmitter, on 40m, 20m, across 4 UTC dates in the available aggregate history. Observed between 2026-08-28 and 2026-08-31.

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 52 FT8 messages attributed to DF4FW as the transmitting token by decoded message structure across 4 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (56%), followed by 20 m (44%). Most decodes (92%) fell within the six-hour window 18:00-00:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

40m · 29 20m · 23

First attributed message: 2026-08-28
Last attributed message: 2026-08-31 18:38 UTC

Observed FT8 message patterns

Attributed sample: 52 messages
Active dates: 4 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -20 to -8 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 17, moderate (-15 to -9 dB) 29, strong (≥ -8 dB) 6.

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 DF4FW in decoded directed-looking exchanges:

PC2J · Netherlands ×2 E75W · Bosnia-Herzegovina EA1CQ · Spain F5OYA/P · France F5PEG · France IU3WIX · Italy IU5HIU · Italy DD7EE · Fed. Rep. of Germany EA5FD · Spain IN3OWY · Italy OH1LA · Finland RV3QP · European Russia

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 DF4FW

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: JO43 · 32 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 964 km (approx.)
Last such locator decoded: 2026-08-31 18:38 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	DF4FW S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-31 19:06	20m	- / -14	EA1CQ	+2 / -	4	✓ Closing fragment
08-31 18:15	20m	-13 / -	RI1FJL	- / -	3	Partial capture
08-31 17:49	20m	- / -11	IU5HIU	+15 / -	3	✓ Closing fragment
08-31 17:46	20m	- / -22	F4NBB	-6 / -	13	Partial capture
08-31 17:39	20m	- / -	RW6B	+2 / -	2	Partial capture
08-31 17:36	20m	- / -16	F4NBB	-8 / -	2	Partial capture
08-31 17:27	20m	- / -	UB3FBJ	+4 / -	2	Partial capture
08-29 21:25	40m	-11 / -	HB1C	+12 / -15	4	Partial capture
08-29 18:11	20m	- / 0	IU3WIX	-15 / -	3	✓ Closing fragment
08-29 10:12	20m	- / -10	RN6MA	-12 / -	3	Partial capture
08-28 23:42	40m	-11 / -12	RV3QP	0 / +5	6	✓ Full exchange observed
08-28 23:36	40m	-13 / -24	PC2J	-2 / -6	20	✓ Full exchange observed
08-28 23:35	40m	-16 / -6	EA5FD	-8 / +6	5	✓ Full exchange observed
08-28 23:16	40m	- / -	PA1PXL	-1 / -	3	Partial capture
08-28 19:36	20m	- / -10	F5OYA/P	0 / -	4	✓ Closing fragment
08-28 16:52	20m	- / -3	F1THK	0 / -	2	Partial capture
08-28 16:44	40m	- / -6	ON7DE	-12 / -	4	Partial capture
08-28 16:43	40m	- / -	IN3OWY	-20 / -	2	✓ Closing fragment
08-10 18:26	40m	- / -	9A4ZM	-8 / -	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
175230  -1 1982  DF4FW F4NBB -22
181515 -14  365  RI1FJL DF4FW JO43 (x4)
182345 -10 1171  CQ DF4FW JO43 (x3)
182730  +9 2167  DF4FW PD7JLP JO32
183830  -8 1288  CQ DF4FW JO43
190315  -1 2474  DF4FW F5PEG 73
190615  +1  995  DF4FW EA1CQ IN83 (x4)

40m

UTC    dB Audio  Message
234315  +1 1255  DF4FW RV3QP LO01
234330  -9 1254  CQ DF4FW JO43 (x2)
234500 -13 1254  RV3QP DF4FW +05
234515  +1 1255  DF4FW RV3QP R-12
234530  -9 1254  RV3QP DF4FW RR73
234545  +2 1254  DF4FW RV3QP 73
212445 -11 1980  CQ DF4FW JO43
212500 +12 2412  DF4FW HB1C JN46
212515 -17 1980  CQ DF4FW JO43
212530  +6 2940  DF4FW F6BHK JN24
212545 -10 1980  HB1C DF4FW -15 (x3)
212930 -14 1980  DF4FW OK1WCF R-15

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.

FT8DB and SO8OO WebSDR are a hobby project maintained solo. ☕ Buy me a coffee