DM3CH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JN39

Receiver-side FT8 activity involving DM3CH, decoded by SO8OO in southeastern Poland. 25 FT8 messages attributed to this token as transmitter, on 80m, 40m, 20m, across 5 UTC dates in the available aggregate history. Observed between 2026-07-02 and 2026-07-26.

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 DM3CH 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 (68%), followed by 40 m (28%) and 80 m (4%). Several six-hour UTC windows tied for the largest share (56%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's moderate S/N range (60%); the estimated median was -14 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-14 dB

Estimated median S/N

Bands

80m · 1 40m · 7 20m · 17

First attributed message: 2026-07-02
Last attributed message: 2026-07-26 07:22 UTC

Observed FT8 message patterns

Attributed sample: 25 messages
Active dates: 5 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -21 to -9 dB
Recurring-pattern threshold: Met

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

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 DM3CH in decoded directed-looking exchanges:

DL1UDO · Fed. Rep. of Germany F5IXN · France LY3I · Lithuania OH8JEP · Finland PD3LKN · Netherlands SM6UQL · Sweden UT4PA · Ukraine DL9FA · Fed. Rep. of Germany DL9KM · Fed. Rep. of Germany DM8SB · Fed. Rep. of Germany OZ9FF · Denmark SM2OTU · Sweden

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 DM3CH

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: JN39 · 11 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,063 km (approx.)
Last such locator decoded: 2026-07-17 11:38 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	DM3CH S/N	Counterpart	Counterpart S/N	Msgs	Capture
07-26 07:22	20m	-13 / -	OH8JEP	- / -7	2	✓ Closing fragment
07-24 14:47	20m	- / -5	PD3LKN	-12 / -	3	✓ Closing fragment
07-22 09:25	20m	-10 / -	OH6FSO	- / -17	2	Partial capture
07-16 17:31	40m	-14 / -12	SM7RHI	-4 / -13	4	✓ Full exchange observed
07-16 17:22	40m	- / -	DL9FA	-16 / -	3	✓ Closing fragment
07-16 17:17	40m	- / -	DL6CGN	-17 / -	2	Partial capture
07-16 17:16	40m	- / 0	DM8SB	-11 / -	5	✓ Closing fragment
07-16 17:14	40m	- / -	UA4FKT	-17 / -	2	✓ Closing fragment
07-16 17:10	40m	- / -2	DL9KM	-11 / -	3	✓ Closing fragment
07-16 17:01	20m	-6 / -	OH1CMV	- / -	2	Partial capture
07-16 16:54	20m	-11 / -	SM6UQL	- / -	3	✓ Closing fragment
07-02 18:42	40m	- / -11	SP6AMI	-4 / -	3	Partial capture
07-02 18:40	40m	-15 / -	OZ9FF	-19 / -1	5	✓ Closing observed
07-02 08:32	20m	-18 / -	UT4PA	- / -6	2	✓ Closing fragment
07-02 08:27	20m	-22 / -	LY3I	- / -	2	Partial capture
07-02 08:20	20m	- / -4	F5IXN	-16 / -	5	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

20m

UTC    dB Audio  Message
165400  -9 1163  SM6UQL DM3CH JN39 (x3)
170100  -8  669  OH1CMV DM3CH JN39 (x2)
113330 -18 2319  OZ9FF DM3CH JN39
113845 -21 2080  DK4NB DM3CH JN39
092545 -11 2496  OH6FSO DM3CH R-17 (x2)
144545 -18 1274  DM3CH DL1UDO 73
144745  -9  783  DM3CH PD3LKN JO22 (x3)
072200 -12  824  OH8JEP DM3CH R-07 (x2)

40m

UTC    dB Audio  Message
171530 -16 1695  DM3CH UA4FKT 73
171630 -11 1475  DM3CH DM8SB JO62 (x3)
171745 -17 1303  DM3CH DL6CGN JO51
171800 -13 1475  DM3CH DM8SB R-06
171815 -17 1302  DM3CH DL6CGN JO51
171830 -14 1475  DM3CH DM8SB R-06
172230 -24 1918  DM3CH DL9FA JO53 (x3)
173115  -1 2993  DM3CH SM7RHI -12
173130 -18 1318  SM7RHI DM3CH R-13
173145  -7 2993  DM3CH SM7RHI RR73
173200  -9 1317  SM7RHI DM3CH 73

80m

UTC    dB Audio  Message
163730 -12 2307  DM3CH IQ4JO JN63
182430 -14 2124  DO7TW DM3CH JN39

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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