DK4RH — FT8 activity observed at SO8OO

DXCC entity inferred from callsign: Fed. Rep. of Germany Most frequent locator attributed to this token: JO31

Receiver-side FT8 activity involving DK4RH, decoded by SO8OO in southeastern Poland. 7,314 FT8 messages attributed to this token as transmitter, on 80m, 60m, 40m, 20m, 10m, across 77 UTC dates in the available aggregate history. Observed between 2026-07-07 and 2026-09-21.

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 7,314 FT8 messages attributed to DK4RH as the transmitting token by decoded message structure across 77 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (26%), followed by 80 m (24%) and 60 m (21%). Most decodes (64%) fell within the six-hour window 16:00-22:00 UTC. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -12 dB.

Overview

7,314

Messages attributed

UTC dates decoded

1,269

Active 15-min windows

-12 dB

Estimated median S/N

Bands

80m · 1,782 60m · 1,525 40m · 1,924 20m · 1,453 10m · 630

First attributed message: 2026-07-07
Last attributed message: 2026-09-21 14:18 UTC

Observed FT8 message patterns

Attributed sample: 7,314 messages
Active dates: 77 UTC dates
Estimated median S/N: -12 dB
Estimated 10th-90th percentile: -21 to -2 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 2,285, moderate (-15 to -9 dB) 2,665, strong (≥ -8 dB) 2,364.

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 DK4RH in decoded directed-looking exchanges:

CR5VP · Portugal ×3 DH2RL · Fed. Rep. of Germany ×3 DL6MRM · Fed. Rep. of Germany ×3 IK4LZH · Italy ×3 DL8NW · Fed. Rep. of Germany ×3 EH1PDA · Spain ×3 SP1ZMO · Poland ×3 DK1XAM · Fed. Rep. of Germany ×3 LY8O · Lithuania ×3 DK0ACI · Fed. Rep. of Germany ×3 DA6IT · Fed. Rep. of Germany ×2 EG7VER · Spain ×2

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 DK4RH

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: JO31 · 5,738 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,054 km (approx.)
Last such locator decoded: 2026-09-21 14:17 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	DK4RH S/N	Counterpart	Counterpart S/N	Msgs	Capture
09-21 14:17	40m	-14 / -	DL6TT	- / -13	3	✓ Closing fragment
09-21 14:15	40m	-19 / -	SA7KJB	- / -12	4	Partial capture
09-21 09:09	40m	- / -	IZ5RKH	-11 / -	3	Partial capture
09-21 06:59	40m	-10 / -	F5MOO	+2 / -	2	✓ Closing observed
09-21 06:51	60m	- / -	F1IQH	-10 / -	2	Partial capture
09-21 06:48	80m	-19 / -	DF9HT/P	- / -	2	✓ Closing fragment
09-21 06:40	80m	-20 / -16	SP1ZMO	-6 / -19	15	✓ Full exchange observed
09-20 22:36	60m	-10 / -11	OH3GBW	0 / -14	5	✓ Full exchange observed
09-20 19:28	60m	- / -13	OZ1NIB	-10 / -	2	Partial capture
09-20 19:16	80m	-1 / -5	DL80NRW	-6 / -14	11	Partial capture
09-20 19:14	80m	-10 / -1	I2JIN	-10 / -9	5	✓ Full exchange observed
09-20 19:12	80m	0 / -2	DG3YEV	+16 / -6	4	✓ Full exchange observed
09-20 19:07	80m	-5 / -5	HF6UWU	+1 / -15	5	✓ Full exchange observed
09-20 17:25	40m	+3 / -10	DG9SBJ	+4 / -11	4	✓ Full exchange observed
09-20 15:41	60m	- / -	DL1EFA	-8 / -	2	Partial capture
09-20 11:00	40m	- / -	SP9VRQ	-2 / -	3	Partial capture
09-20 08:42	40m	-18 / -	F4JDC	- / -11	2	Partial capture
09-20 08:40	40m	-17 / -	F5IGK	- / -3	2	Partial capture
09-20 07:29	40m	-10 / -	M7PCE	- / -	3	Partial capture
09-20 07:16	40m	- / -	SP2SGZ	-5 / -	3	Partial capture
09-20 06:22	40m	-11 / -	F4NHL	- / -12	2	✓ Closing fragment
09-20 06:13	60m	-12 / -	WC4Y	- / -	2	Partial capture
09-20 06:07	80m	-16 / -	EA6Y	- / -	2	Partial capture
09-20 06:06	80m	-14 / -10	9A2LM	-18 / -15	4	✓ Full exchange observed
09-20 06:04	80m	-8 / -8	S57TW	+1 / +3	6	✓ Full exchange observed
09-19 21:47	60m	-3 / -	PE1K	- / -11	5	Partial capture
09-19 20:36	40m	-13 / -	M7SQI	- / -21	2	✓ Closing fragment
09-19 20:32	40m	+6 / -	RV0AAE	- / -	5	Partial capture
09-19 20:20	60m	-12 / -	IZ0AIO	-17 / -	3	✓ Closing observed
09-19 20:18	60m	-9 / -13	DL7HS	-10 / -2	5	✓ Full exchange observed
09-19 20:08	80m	- / -4	OK1PHM	+7 / -	2	✓ Closing fragment
09-19 17:26	60m	-8 / +3	5Q1X	-12 / -9	6	✓ Full exchange observed
09-19 17:23	60m	- / +4	F1PBZ	-14 / -	5	Partial capture
09-19 15:54	40m	-12 / -	EV6Z	- / -	5	Partial capture
09-19 10:03	40m	-13 / 0	DA1VA	-6 / -	4	✓ Closing observed
09-19 09:59	40m	- / -1	OK2PUM/P	-14 / -	2	Partial capture
09-19 08:35	40m	-10 / -	F4JUG	- / -6	4	Partial capture
09-19 08:31	40m	-11 / -	MW0ACX	- / -13	3	✓ Closing fragment
09-19 06:12	40m	-10 / -11	OM3WTA	-4 / -	4	Partial capture
09-18 21:51	80m	0 / -14	IU0NAD	-18 / -15	3	✓ Full exchange observed
09-18 21:47	80m	-7 / -	9A60CBM	- / -	5	Partial capture
09-18 19:59	40m	-6 / -6	EA3JEM	-16 / -	4	Partial capture
09-18 19:51	60m	-13 / -	II7IABB	- / -	7	Partial capture
09-18 19:50	60m	-17 / -	IK2ZJP	- / 0	3	✓ Closing fragment
09-18 19:44	80m	-9 / +6	OZ/DL3KWF	-4 / -12	3	Partial capture
09-18 19:43	80m	- / -14	OE5ABL	+4 / -	8	Partial capture
09-18 17:54	60m	-11 / -1	DG1KFR	-2 / -	3	Partial capture
09-18 17:49	60m	-14 / +8	DK0RPO	-4 / +2	4	✓ Full exchange observed
09-18 17:45	60m	-9 / -	DL3RN	-18 / -2	3	✓ Closing observed
09-18 17:05	40m	-12 / -	R3RR	-13 / -	8	✓ Closing observed

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
105900 -13  775  CQ DK4RH JO31                         a1
110100 -18  916  M9ORB DK4RH JO31
130100 -12  557  CQ DK4RH JO31 (x5)
141200 -19 2113  SA7KJB DK4RH JO31 (x5)
141730 -13 1041  DL6TT DK4RH JO31 (x3)

60m

UTC    dB Audio  Message
223630  -4  640  DK4RH OH3GBW KP21
223645 -12 1718  OH3GBW DK4RH -14
223700  +3  640  DK4RH OH3GBW R-11
223715  -8 1719  OH3GBW DK4RH RR73
223730  +0  640  DK4RH OH3GBW 73
223745 -10 1719  CQ DK4RH JO31 (x3)
065145 -10  645  DK4RH F1IQH JN27 (x2)
065300  -9  645  CQ DK4RH JO31 (x5)

80m

UTC    dB Audio  Message
064145 -21 1411  SP1ZMO DK4RH -19 (x2)
064230  -7 1411  DK4RH SP1ZMO JO73
064245 -18 1411  SP1ZMO DK4RH -19 (x2)
064330  -5 1411  DK4RH SP1ZMO R-16
064345 -22 1412  SP1ZMO DK4RH RR73
064400  -3 1411  DK4RH SP1ZMO R-16 (x2)
064445 -18 1411  SP1ZMO DK4RH RR73
064515 -15 1411  CQ DK4RH JO31
064530  -5 1411  DK4RH SP1ZMO R-16
064645 -21 1411  CQ DK4RH JO31
064845 -17 2134  DF9HT/P DK4RH JO31 (x2)

10m

UTC    dB Audio  Message
073015 -20 1131  DN9MAW DK4RH JO31 (x2)
073230 -13  827  S57MPU DK4RH JO31
073245  +2  827  DK4RH S57MPU -11
073300 -14  827  S57MPU DK4RH R-05
073315  +5  827  DK4RH S57MPU RR73
073430 -22 1563  F4BHC DK4RH JO31
073630  -8  502  HB9FLH DK4RH R+07 (x2)
074000 -15 2270  G0FWX DK4RH JO31
110315 -21 2156  OK2CNI DK4RH JO31
081145 -18 1377  DK4RH IW8PQ JM78 (x2)
081230 -18 1538  CQ DK4RH JO31 (x2)

20m

UTC    dB Audio  Message
170830 -15  903  CQ DK4RH JO31 (x2)
170930  -8  903  YC9GBQ DK4RH -11
170945 -11 2106  DK4RH YC9GBQ R-18
171000  -3  903  YC9GBQ DK4RH RR73
171130  -2  903  5Z4VJ DK4RH -03
171330  -8  903  CQ DK4RH JO31 (x4)
190400 -13 1896  BH4THI DK4RH JO31
191100  -9  382  9A/DL4DCW DK4RH JO31 (x4)

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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