DF5ZM — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO40

Receiver-side FT8 activity involving DF5ZM, decoded by SO8OO in southeastern Poland. 12 FT8 messages attributed to this token as transmitter, on 20m, 10m, across 8 UTC dates in the available aggregate history. Observed between 2026-06-28 and 2026-08-15.

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 12 FT8 messages attributed to DF5ZM as the transmitting token by decoded message structure across 8 UTC dates in the available aggregate history. The largest monitored-band total was 10 m (67%), followed by 20 m (33%). In this small sample, the estimated median decoder S/N was -18 dB; no usual signal pattern is inferred.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-18 dB

Estimated median S/N

Bands

20m · 4 10m · 8

First attributed message: 2026-06-28
Last attributed message: 2026-08-15 19:02 UTC

Observed FT8 message patterns

Attributed sample: 12 messages
Active dates: 8 UTC dates
Estimated median S/N: -18 dB
S/N percentile sample: Too small
Recurring-pattern threshold: Not met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 10, moderate (-15 to -9 dB) 2, strong (≥ -8 dB) 0.

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. The sample does not meet the threshold for a recurring time or signal-pattern claim (20 attributed messages, three UTC dates and five distinct 15-minute windows).

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 DF5ZM

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: JO40 · 12 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 911 km (approx.)
Last such locator decoded: 2026-08-15 19:02 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	DF5ZM S/N	Counterpart	Counterpart S/N	Msgs	Capture
08-15 15:37	20m	- / -20	RU3QR	-15 / -	2	Partial capture
08-12 15:33	10m	- / -	IU4QRO	-12 / -	2	Partial capture
08-12 14:22	20m	- / -	PC2J	-4 / -	5	Partial capture
08-04 10:08	20m	- / -1	RU3QR	-24 / -	2	Partial capture
07-25 18:45	20m	- / -	SV2AOB	-12 / -	2	Partial capture
07-25 10:57	10m	- / -12	ES2AJ	-4 / -	2	Partial capture
07-16 11:46	20m	- / -	LZ3CB	-2 / -	2	Partial capture
07-07 00:37	20m	- / -	SP5EXA	-19 / -	2	Partial capture
07-05 14:39	20m	- / -	IK4LZH	-12 / -	2	Partial capture
06-28 12:27	20m	- / -	IZ4AIF	-9 / -	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
171600 -13 2075  DF5ZM YO4NF -21
184545 -10 2378  DF5ZM SV2AOB KN10 (x2)
160045 -20 2072  DF5ZM R9FDE LO88
100815 -24 1439  DF5ZM RU3QR -01 (x2)
151730 -13 1213  DF5ZM RX3ASQ KO95
142230  -4 2075  DF5ZM PC2J JO22 (x5)
153730 -16 1420  DF5ZM RU3QR -20 (x2)
190200 -21 2074  CQ DF5ZM JO40

10m

UTC    dB Audio  Message
133830 -17 2084  CQ DF5ZM JO40
133845 -15 1949  DF5ZM F4LZZ JN09
135430 -12 2085  CQ DF5ZM JO40 (x2)
173945  +2 2833  DF5ZM F1PBZ -11
205645 -17 2085  CQ DF5ZM JO40 (x3)
105730  -5 2310  DF5ZM ES2AJ KO29 (x2)
155230 -22 2085  CQ DF5ZM JO40 (x2)
153315 -16 2084  DF5ZM IU4QRO JN54 (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.

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