RK4HZ — 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: European Russia Most frequent locator attributed to this token: LO43

Receiver-side FT8 activity involving RK4HZ, decoded by SO8OO in southeastern Poland. 60 FT8 messages attributed to this token as transmitter, on 40m, across 9 UTC dates in the available aggregate history. Observed between 2026-06-09 and 2026-10-27.

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 60 FT8 messages attributed to RK4HZ as the transmitting token by decoded message structure across 9 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (100%). Several six-hour UTC windows tied for the largest share (97%), so no unique busiest interval is claimed. Most successfully decoded messages attributed to this token fell in SO8OO's moderate S/N range (67%); the estimated median was -13 dB.

Overview

Messages attributed

UTC dates decoded

Active 15-min windows

-13 dB

Estimated median S/N

Bands

40m · 60

First attributed message: 2026-06-09
Last attributed message: 2026-10-27 04:51 UTC

Observed FT8 message patterns

Attributed sample: 60 messages
Active dates: 9 UTC dates
Estimated median S/N: -13 dB
Estimated 10th-90th percentile: -20 to -9 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 15, moderate (-15 to -9 dB) 40, strong (≥ -8 dB) 5.

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 RK4HZ in decoded directed-looking exchanges:

UA9SY · Asiatic Russia ×2 DJ0MAB · Fed. Rep. of Germany ES2AJ · Estonia F1IQH · France F4BYA · France IW2DNI · Italy LZ3CB · Bulgaria R1TAX · European Russia R3LDK · European Russia R6FML · European Russia R6ZAJ · European Russia RA6LTD · 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 RK4HZ

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: LO43 · 44 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,903 km (approx.)
Last such locator decoded: 2026-10-27 04:51 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	RK4HZ S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-27 04:47	40m	-10 / -	UA9SY	- / -5	2	✓ Closing fragment
10-26 05:36	40m	- / -	ON8WR	-5 / -	2	Partial capture
10-21 04:22	40m	-9 / -6	R6FML	-20 / -8	5	✓ Full exchange observed
10-20 05:28	40m	- / -8	ES2AJ	+17 / -	2	✓ Closing fragment
10-20 05:24	40m	-12 / -	UA9SY	- / +1	2	✓ Closing fragment
10-20 05:24	40m	- / -	ES2AJ	-2 / -	2	Partial capture
10-20 05:19	40m	- / -9	F1IQH	-6 / -	5	✓ Closing fragment
10-20 05:16	40m	- / +3	RD3FY	-3 / -	5	✓ Closing fragment
10-08 04:34	40m	- / -	EA5HEU	-11 / -	3	Partial capture
09-30 05:52	40m	- / -17	LZ3CB	+13 / -	6	✓ Closing fragment
09-30 05:46	40m	- / -	DH3KR	-12 / -	4	Partial capture
09-30 05:46	40m	- / -	YL3GCJ	-16 / -	2	✓ Closing fragment
09-15 03:51	40m	-23 / -2	RC3DN	-9 / -	4	✓ Closing observed
09-11 04:10	40m	-15 / -2	SQ2BXI	-10 / -4	4	✓ Full exchange observed
09-08 03:54	40m	- / -12	IW2DNI	-1 / -	5	✓ Closing fragment
09-02 04:42	40m	- / -17	DJ0MAB	+4 / -	4	✓ Closing fragment
09-02 04:39	40m	- / -5	RA6LTD	-11 / -	3	✓ Closing fragment
09-02 04:38	40m	- / -	R3LDK	0 / -	2	✓ Closing fragment
09-02 04:37	40m	- / -12	F4BYA	+3 / -	3	✓ Closing fragment

Recent FT8 messages decoded at SO8OO

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

40m

UTC    dB Audio  Message
042845 -13 2543  CQ RK4HZ LO43
042945 -13 2543  R6ZAJ RK4HZ RR73
053600  -5 2557  RK4HZ ON8WR JO11 (x2)
053815 -20 2554  CQ RK4HZ LO43 (x5)
044700 -10 2671  UA9SY RK4HZ -05 (x2)
044930 -11 2670  CQ RK4HZ LO43 (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.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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